Country: Canada
United StatesCanadaUnited Kingdom

Great Slave Lake at Yellowknife Bay water level history

Daily records since 1934 · Level today: 156.502 m

Highest on record
157.275 m
Sep 7, 2020
Lowest on record
155.832 m
Nov 20, 2023
Today
156.502 m
Oct 23, 2026
Years of data
93
since 1934

In short

Across 79 complete years, 2024 had the lowest average level (156.047 m) and 2021 the highest (157.046 m).

On average the lake is lowest in December (156.460 m) and highest in July (156.767 m).

Great Slave Lake at Yellowknife Bay level, all years

Loading chart…

Measured Normal range for the date (middle 50% of past years)

Each year's lowest and highest level

155.7156.1156.6157.0157.41934194619581970198219942006201820261934: lowest 156.33 m (1934-01-31), highest 156.77 m (1934-03-31), average 156.56 m, 154 days measured1935: lowest 156.47 m (1935-06-06), highest 156.57 m (1935-06-13), average 156.52 m, 2 days measured1938: lowest 156.22 m (1938-12-09), highest 156.81 m (1938-10-14), average 156.55 m, 214 days measured1939: lowest 156.14 m (1939-04-24), highest 156.87 m (1939-08-15), average 156.46 m, 334 days measured1940: lowest 156.33 m (1940-12-20), highest 156.88 m (1940-08-09), average 156.60 m, 275 days measured1941: lowest 156.21 m (1941-04-23), highest 156.74 m (1941-08-04), average 156.48 m, 365 days measured1942: lowest 156.30 m (1942-12-20), highest 156.87 m (1942-07-02), average 156.56 m, 365 days measured1943: lowest 156.29 m (1943-11-29), highest 156.87 m (1943-07-23), average 156.48 m, 365 days measured1944: lowest 156.23 m (1944-04-17), highest 156.66 m (1944-09-03), average 156.40 m, 366 days measured1945: lowest 156.14 m (1945-04-30), highest 156.59 m (1945-07-18), average 156.30 m, 365 days measured1946: lowest 156.12 m (1946-12-31), highest 156.65 m (1946-08-01), average 156.33 m, 365 days measured1947: lowest 156.11 m (1947-01-10), highest 156.90 m (1947-08-03), average 156.52 m, 365 days measured1948: lowest 156.44 m (1948-05-04), highest 156.99 m (1948-08-30), average 156.73 m, 366 days measured1949: lowest 156.66 m (1949-10-14), highest 156.97 m (1949-08-18), average 156.80 m, 304 days measured1950: lowest 156.39 m (1950-12-13), highest 156.84 m (1950-08-03), average 156.62 m, 245 days measured1951: lowest 156.28 m (1951-05-01), highest 157.02 m (1951-08-08), average 156.63 m, 365 days measured1952: lowest 156.22 m (1952-12-16), highest 156.86 m (1952-08-06), average 156.56 m, 366 days measured1953: lowest 156.21 m (1953-05-09), highest 156.72 m (1953-08-28), average 156.45 m, 365 days measured1954: lowest 156.28 m (1954-05-11), highest 157.06 m (1954-08-25), average 156.65 m, 365 days measured1955: lowest 156.60 m (1955-11-28), highest 157.04 m (1955-07-23), average 156.82 m, 334 days measured1956: lowest 156.48 m (1956-04-23), highest 156.91 m (1956-07-30), average 156.69 m, 245 days measured1957: lowest 156.55 m (1957-02-18), highest 157.12 m (1957-09-12), average 156.79 m, 365 days measured1958: lowest 156.29 m (1958-12-01), highest 157.00 m (1958-06-26), average 156.67 m, 365 days measured1959: lowest 156.35 m (1959-04-19), highest 157.02 m (1959-08-06), average 156.60 m, 365 days measured1960: lowest 156.59 m (1960-04-20), highest 157.12 m (1960-08-14), average 156.81 m, 366 days measured1961: lowest 156.38 m (1961-11-01), highest 157.03 m (1961-08-07), average 156.77 m, 365 days measured1962: lowest 156.38 m (1962-04-26), highest 157.26 m (1962-09-01), average 156.76 m, 365 days measured1963: lowest 156.53 m (1963-11-17), highest 157.11 m (1963-08-14), average 156.83 m, 365 days measured1964: lowest 156.61 m (1964-05-01), highest 157.18 m (1964-08-19), average 156.87 m, 366 days measured1965: lowest 156.65 m (1965-12-24), highest 157.10 m (1965-08-07), average 156.83 m, 365 days measured1966: lowest 156.57 m (1966-04-09), highest 157.02 m (1966-08-09), average 156.75 m, 365 days measured1967: lowest 156.50 m (1967-05-12), highest 157.07 m (1967-07-19), average 156.75 m, 365 days measured1968: lowest 156.28 m (1968-11-30), highest 156.83 m (1968-06-02), average 156.62 m, 366 days measured1969: lowest 156.26 m (1969-11-10), highest 156.75 m (1969-06-03), average 156.50 m, 365 days measured1970: lowest 156.22 m (1970-11-30), highest 156.62 m (1970-07-01), average 156.43 m, 365 days measured1971: lowest 156.31 m (1971-01-02), highest 156.77 m (1971-08-03), average 156.55 m, 307 days measured1972: lowest 156.30 m (1972-01-15), highest 156.91 m (1972-08-14), average 156.64 m, 293 days measured1973: lowest 156.53 m (1973-01-01), highest 156.93 m (1973-08-22), average 156.72 m, 365 days measured1974: lowest 156.53 m (1974-01-16), highest 157.04 m (1974-07-24), average 156.78 m, 365 days measured1975: lowest 156.45 m (1975-11-01), highest 156.95 m (1975-05-27), average 156.76 m, 365 days measured1976: lowest 156.47 m (1976-11-24), highest 156.91 m (1976-09-14), average 156.75 m, 359 days measured1977: lowest 156.47 m (1977-11-22), highest 156.87 m (1977-08-09), average 156.69 m, 292 days measured1978: lowest 156.35 m (1978-11-08), highest 156.82 m (1978-04-05), average 156.64 m, 352 days measured1979: lowest 156.29 m (1979-12-06), highest 156.99 m (1979-07-24), average 156.69 m, 365 days measured1980: lowest 156.19 m (1980-11-29), highest 156.59 m (1980-04-12), average 156.42 m, 338 days measured1981: lowest 156.11 m (1981-11-07), highest 156.65 m (1981-06-14), average 156.39 m, 319 days measured1982: lowest 156.22 m (1982-01-09), highest 156.62 m (1982-06-29), average 156.44 m, 365 days measured1983: lowest 156.42 m (1983-12-06), highest 156.74 m (1983-08-24), average 156.55 m, 365 days measured1984: lowest 156.49 m (1984-01-01), highest 156.84 m (1984-08-09), average 156.66 m, 366 days measured1985: lowest 156.50 m (1985-11-20), highest 156.99 m (1985-06-10), average 156.75 m, 365 days measured1986: lowest 156.40 m (1986-11-10), highest 156.97 m (1986-06-10), average 156.73 m, 365 days measured1987: lowest 156.39 m (1987-11-21), highest 156.78 m (1987-06-17), average 156.64 m, 365 days measured1988: lowest 156.45 m (1988-01-02), highest 157.04 m (1988-08-06), average 156.70 m, 366 days measured1989: lowest 156.50 m (1989-11-10), highest 156.90 m (1989-05-25), average 156.75 m, 365 days measured1990: lowest 156.40 m (1990-11-08), highest 156.87 m (1990-06-23), average 156.67 m, 334 days measured1991: lowest 156.53 m (1991-11-07), highest 157.03 m (1991-07-27), average 156.72 m, 365 days measured1992: lowest 156.43 m (1992-10-16), highest 157.05 m (1992-05-27), average 156.76 m, 366 days measured1993: lowest 156.23 m (1993-10-27), highest 156.87 m (1993-05-09), average 156.61 m, 365 days measured1994: lowest 156.21 m (1994-11-19), highest 156.90 m (1994-05-13), average 156.57 m, 365 days measured1995: lowest 156.09 m (1995-11-09), highest 156.53 m (1995-03-22), average 156.36 m, 365 days measured1996: lowest 156.26 m (1996-01-02), highest 157.09 m (1996-09-26), average 156.69 m, 366 days measured1997: lowest 156.72 m (1997-05-09), highest 157.14 m (1997-08-12), average 156.90 m, 365 days measured1998: lowest 156.23 m (1998-12-22), highest 157.10 m (1998-05-07), average 156.75 m, 365 days measured1999: lowest 156.20 m (1999-12-01), highest 156.65 m (1999-05-26), average 156.47 m, 365 days measured2000: lowest 156.33 m (2000-01-04), highest 156.64 m (2000-10-06), average 156.46 m, 366 days measured2001: lowest 156.38 m (2001-11-17), highest 156.81 m (2001-08-24), average 156.59 m, 365 days measured2002: lowest 156.42 m (2002-11-28), highest 156.72 m (2002-08-16), average 156.58 m, 365 days measured2003: lowest 156.36 m (2003-11-20), highest 156.92 m (2003-05-13), average 156.68 m, 365 days measured2004: lowest 156.33 m (2004-11-06), highest 156.65 m (2004-04-24), average 156.51 m, 366 days measured2005: lowest 156.44 m (2005-01-02), highest 156.81 m (2005-08-20), average 156.66 m, 365 days measured2006: lowest 156.21 m (2006-10-29), highest 156.81 m (2006-06-12), average 156.63 m, 365 days measured2007: lowest 156.37 m (2007-01-01), highest 156.85 m (2007-07-20), average 156.61 m, 365 days measured2008: lowest 156.34 m (2008-12-03), highest 156.82 m (2008-06-01), average 156.61 m, 366 days measured2009: lowest 156.35 m (2009-12-05), highest 156.77 m (2009-05-18), average 156.62 m, 365 days measured2010: lowest 156.01 m (2010-11-22), highest 156.66 m (2010-04-05), average 156.43 m, 365 days measured2011: lowest 156.15 m (2011-12-07), highest 156.66 m (2011-08-16), average 156.40 m, 365 days measured2012: lowest 156.34 m (2012-01-04), highest 156.78 m (2012-08-26), average 156.56 m, 366 days measured2013: lowest 156.33 m (2013-11-15), highest 156.84 m (2013-07-14), average 156.61 m, 365 days measured2014: lowest 156.13 m (2014-11-29), highest 156.65 m (2014-06-26), average 156.48 m, 365 days measured2015: lowest 156.08 m (2015-11-17), highest 156.45 m (2015-06-06), average 156.31 m, 365 days measured2016: lowest 156.18 m (2016-01-02), highest 156.61 m (2016-07-29), average 156.45 m, 366 days measured2017: lowest 156.30 m (2017-11-25), highest 156.80 m (2017-06-17), average 156.60 m, 365 days measured2018: lowest 156.29 m (2018-11-10), highest 156.73 m (2018-07-16), average 156.52 m, 365 days measured2019: lowest 156.33 m (2019-10-27), highest 156.53 m (2019-09-30), average 156.43 m, 365 days measured2020: lowest 156.46 m (2020-01-04), highest 157.28 m (2020-09-07), average 156.92 m, 366 days measured2021: lowest 156.57 m (2021-11-29), highest 157.25 m (2021-07-14), average 157.05 m, 365 days measured2022: lowest 156.29 m (2022-12-04), highest 157.23 m (2022-06-11), average 156.83 m, 365 days measured2023: lowest 155.83 m (2023-11-20), highest 156.62 m (2023-04-26), average 156.33 m, 365 days measured2024: lowest 155.90 m (2024-11-18), highest 156.16 m (2024-09-16), average 156.05 m, 366 days measured2025: lowest 155.95 m (2025-12-04), highest 156.41 m (2025-04-07), average 156.24 m, 365 days measured2026: lowest 156.50 m (2026-10-18), highest 156.67 m (2026-10-11), average 156.59 m, 30 days measured
155.7156.1156.6157.0157.4193419571980200320261934: lowest 156.33 m (1934-01-31), highest 156.77 m (1934-03-31), average 156.56 m, 154 days measured1935: lowest 156.47 m (1935-06-06), highest 156.57 m (1935-06-13), average 156.52 m, 2 days measured1938: lowest 156.22 m (1938-12-09), highest 156.81 m (1938-10-14), average 156.55 m, 214 days measured1939: lowest 156.14 m (1939-04-24), highest 156.87 m (1939-08-15), average 156.46 m, 334 days measured1940: lowest 156.33 m (1940-12-20), highest 156.88 m (1940-08-09), average 156.60 m, 275 days measured1941: lowest 156.21 m (1941-04-23), highest 156.74 m (1941-08-04), average 156.48 m, 365 days measured1942: lowest 156.30 m (1942-12-20), highest 156.87 m (1942-07-02), average 156.56 m, 365 days measured1943: lowest 156.29 m (1943-11-29), highest 156.87 m (1943-07-23), average 156.48 m, 365 days measured1944: lowest 156.23 m (1944-04-17), highest 156.66 m (1944-09-03), average 156.40 m, 366 days measured1945: lowest 156.14 m (1945-04-30), highest 156.59 m (1945-07-18), average 156.30 m, 365 days measured1946: lowest 156.12 m (1946-12-31), highest 156.65 m (1946-08-01), average 156.33 m, 365 days measured1947: lowest 156.11 m (1947-01-10), highest 156.90 m (1947-08-03), average 156.52 m, 365 days measured1948: lowest 156.44 m (1948-05-04), highest 156.99 m (1948-08-30), average 156.73 m, 366 days measured1949: lowest 156.66 m (1949-10-14), highest 156.97 m (1949-08-18), average 156.80 m, 304 days measured1950: lowest 156.39 m (1950-12-13), highest 156.84 m (1950-08-03), average 156.62 m, 245 days measured1951: lowest 156.28 m (1951-05-01), highest 157.02 m (1951-08-08), average 156.63 m, 365 days measured1952: lowest 156.22 m (1952-12-16), highest 156.86 m (1952-08-06), average 156.56 m, 366 days measured1953: lowest 156.21 m (1953-05-09), highest 156.72 m (1953-08-28), average 156.45 m, 365 days measured1954: lowest 156.28 m (1954-05-11), highest 157.06 m (1954-08-25), average 156.65 m, 365 days measured1955: lowest 156.60 m (1955-11-28), highest 157.04 m (1955-07-23), average 156.82 m, 334 days measured1956: lowest 156.48 m (1956-04-23), highest 156.91 m (1956-07-30), average 156.69 m, 245 days measured1957: lowest 156.55 m (1957-02-18), highest 157.12 m (1957-09-12), average 156.79 m, 365 days measured1958: lowest 156.29 m (1958-12-01), highest 157.00 m (1958-06-26), average 156.67 m, 365 days measured1959: lowest 156.35 m (1959-04-19), highest 157.02 m (1959-08-06), average 156.60 m, 365 days measured1960: lowest 156.59 m (1960-04-20), highest 157.12 m (1960-08-14), average 156.81 m, 366 days measured1961: lowest 156.38 m (1961-11-01), highest 157.03 m (1961-08-07), average 156.77 m, 365 days measured1962: lowest 156.38 m (1962-04-26), highest 157.26 m (1962-09-01), average 156.76 m, 365 days measured1963: lowest 156.53 m (1963-11-17), highest 157.11 m (1963-08-14), average 156.83 m, 365 days measured1964: lowest 156.61 m (1964-05-01), highest 157.18 m (1964-08-19), average 156.87 m, 366 days measured1965: lowest 156.65 m (1965-12-24), highest 157.10 m (1965-08-07), average 156.83 m, 365 days measured1966: lowest 156.57 m (1966-04-09), highest 157.02 m (1966-08-09), average 156.75 m, 365 days measured1967: lowest 156.50 m (1967-05-12), highest 157.07 m (1967-07-19), average 156.75 m, 365 days measured1968: lowest 156.28 m (1968-11-30), highest 156.83 m (1968-06-02), average 156.62 m, 366 days measured1969: lowest 156.26 m (1969-11-10), highest 156.75 m (1969-06-03), average 156.50 m, 365 days measured1970: lowest 156.22 m (1970-11-30), highest 156.62 m (1970-07-01), average 156.43 m, 365 days measured1971: lowest 156.31 m (1971-01-02), highest 156.77 m (1971-08-03), average 156.55 m, 307 days measured1972: lowest 156.30 m (1972-01-15), highest 156.91 m (1972-08-14), average 156.64 m, 293 days measured1973: lowest 156.53 m (1973-01-01), highest 156.93 m (1973-08-22), average 156.72 m, 365 days measured1974: lowest 156.53 m (1974-01-16), highest 157.04 m (1974-07-24), average 156.78 m, 365 days measured1975: lowest 156.45 m (1975-11-01), highest 156.95 m (1975-05-27), average 156.76 m, 365 days measured1976: lowest 156.47 m (1976-11-24), highest 156.91 m (1976-09-14), average 156.75 m, 359 days measured1977: lowest 156.47 m (1977-11-22), highest 156.87 m (1977-08-09), average 156.69 m, 292 days measured1978: lowest 156.35 m (1978-11-08), highest 156.82 m (1978-04-05), average 156.64 m, 352 days measured1979: lowest 156.29 m (1979-12-06), highest 156.99 m (1979-07-24), average 156.69 m, 365 days measured1980: lowest 156.19 m (1980-11-29), highest 156.59 m (1980-04-12), average 156.42 m, 338 days measured1981: lowest 156.11 m (1981-11-07), highest 156.65 m (1981-06-14), average 156.39 m, 319 days measured1982: lowest 156.22 m (1982-01-09), highest 156.62 m (1982-06-29), average 156.44 m, 365 days measured1983: lowest 156.42 m (1983-12-06), highest 156.74 m (1983-08-24), average 156.55 m, 365 days measured1984: lowest 156.49 m (1984-01-01), highest 156.84 m (1984-08-09), average 156.66 m, 366 days measured1985: lowest 156.50 m (1985-11-20), highest 156.99 m (1985-06-10), average 156.75 m, 365 days measured1986: lowest 156.40 m (1986-11-10), highest 156.97 m (1986-06-10), average 156.73 m, 365 days measured1987: lowest 156.39 m (1987-11-21), highest 156.78 m (1987-06-17), average 156.64 m, 365 days measured1988: lowest 156.45 m (1988-01-02), highest 157.04 m (1988-08-06), average 156.70 m, 366 days measured1989: lowest 156.50 m (1989-11-10), highest 156.90 m (1989-05-25), average 156.75 m, 365 days measured1990: lowest 156.40 m (1990-11-08), highest 156.87 m (1990-06-23), average 156.67 m, 334 days measured1991: lowest 156.53 m (1991-11-07), highest 157.03 m (1991-07-27), average 156.72 m, 365 days measured1992: lowest 156.43 m (1992-10-16), highest 157.05 m (1992-05-27), average 156.76 m, 366 days measured1993: lowest 156.23 m (1993-10-27), highest 156.87 m (1993-05-09), average 156.61 m, 365 days measured1994: lowest 156.21 m (1994-11-19), highest 156.90 m (1994-05-13), average 156.57 m, 365 days measured1995: lowest 156.09 m (1995-11-09), highest 156.53 m (1995-03-22), average 156.36 m, 365 days measured1996: lowest 156.26 m (1996-01-02), highest 157.09 m (1996-09-26), average 156.69 m, 366 days measured1997: lowest 156.72 m (1997-05-09), highest 157.14 m (1997-08-12), average 156.90 m, 365 days measured1998: lowest 156.23 m (1998-12-22), highest 157.10 m (1998-05-07), average 156.75 m, 365 days measured1999: lowest 156.20 m (1999-12-01), highest 156.65 m (1999-05-26), average 156.47 m, 365 days measured2000: lowest 156.33 m (2000-01-04), highest 156.64 m (2000-10-06), average 156.46 m, 366 days measured2001: lowest 156.38 m (2001-11-17), highest 156.81 m (2001-08-24), average 156.59 m, 365 days measured2002: lowest 156.42 m (2002-11-28), highest 156.72 m (2002-08-16), average 156.58 m, 365 days measured2003: lowest 156.36 m (2003-11-20), highest 156.92 m (2003-05-13), average 156.68 m, 365 days measured2004: lowest 156.33 m (2004-11-06), highest 156.65 m (2004-04-24), average 156.51 m, 366 days measured2005: lowest 156.44 m (2005-01-02), highest 156.81 m (2005-08-20), average 156.66 m, 365 days measured2006: lowest 156.21 m (2006-10-29), highest 156.81 m (2006-06-12), average 156.63 m, 365 days measured2007: lowest 156.37 m (2007-01-01), highest 156.85 m (2007-07-20), average 156.61 m, 365 days measured2008: lowest 156.34 m (2008-12-03), highest 156.82 m (2008-06-01), average 156.61 m, 366 days measured2009: lowest 156.35 m (2009-12-05), highest 156.77 m (2009-05-18), average 156.62 m, 365 days measured2010: lowest 156.01 m (2010-11-22), highest 156.66 m (2010-04-05), average 156.43 m, 365 days measured2011: lowest 156.15 m (2011-12-07), highest 156.66 m (2011-08-16), average 156.40 m, 365 days measured2012: lowest 156.34 m (2012-01-04), highest 156.78 m (2012-08-26), average 156.56 m, 366 days measured2013: lowest 156.33 m (2013-11-15), highest 156.84 m (2013-07-14), average 156.61 m, 365 days measured2014: lowest 156.13 m (2014-11-29), highest 156.65 m (2014-06-26), average 156.48 m, 365 days measured2015: lowest 156.08 m (2015-11-17), highest 156.45 m (2015-06-06), average 156.31 m, 365 days measured2016: lowest 156.18 m (2016-01-02), highest 156.61 m (2016-07-29), average 156.45 m, 366 days measured2017: lowest 156.30 m (2017-11-25), highest 156.80 m (2017-06-17), average 156.60 m, 365 days measured2018: lowest 156.29 m (2018-11-10), highest 156.73 m (2018-07-16), average 156.52 m, 365 days measured2019: lowest 156.33 m (2019-10-27), highest 156.53 m (2019-09-30), average 156.43 m, 365 days measured2020: lowest 156.46 m (2020-01-04), highest 157.28 m (2020-09-07), average 156.92 m, 366 days measured2021: lowest 156.57 m (2021-11-29), highest 157.25 m (2021-07-14), average 157.05 m, 365 days measured2022: lowest 156.29 m (2022-12-04), highest 157.23 m (2022-06-11), average 156.83 m, 365 days measured2023: lowest 155.83 m (2023-11-20), highest 156.62 m (2023-04-26), average 156.33 m, 365 days measured2024: lowest 155.90 m (2024-11-18), highest 156.16 m (2024-09-16), average 156.05 m, 366 days measured2025: lowest 155.95 m (2025-12-04), highest 156.41 m (2025-04-07), average 156.24 m, 365 days measured2026: lowest 156.50 m (2026-10-18), highest 156.67 m (2026-10-11), average 156.59 m, 30 days measured
Lowest to highest that yearYear average2026 so far

One bar per year from the lowest to the highest daily level, with the year's average. Years with no bar have no daily record in the agency archive.

Lowest years

Years ranked by their lowest daily level.

  • 2023155.832 m on Nov 20
  • 2024155.895 m on Nov 18
  • 2025155.953 m on Dec 4
  • 2010156.014 m on Nov 22
  • 2015156.084 m on Nov 17

Yearly highs and lows

YearAverageLowLow dateHighHigh date
2026 (30 days)156.586156.498Oct 18156.670Oct 11
2025156.239155.953Dec 4156.408Apr 7
2024156.047155.895Nov 18156.155Sep 16
2023156.333155.832Nov 20156.615Apr 26
2022156.828156.285Dec 4157.226Jun 11
2021157.046156.572Nov 29157.248Jul 14
2020156.918156.461Jan 4157.275Sep 7
2019156.428156.325Oct 27156.526Sep 30
2018156.516156.288Nov 10156.731Jul 16
2017156.599156.298Nov 25156.798Jun 17
2016156.452156.181Jan 2156.612Jul 29
2015156.308156.084Nov 17156.455Jun 6
2014156.482156.133Nov 29156.648Jun 26
2013156.613156.327Nov 15156.845Jul 14
2012156.563156.337Jan 4156.783Aug 26
2011156.399156.150Dec 7156.661Aug 16
2010156.429156.014Nov 22156.663Apr 5
2009156.625156.351Dec 5156.771May 18
2008156.615156.340Dec 3156.817Jun 1
2007156.607156.374Jan 1156.846Jul 20
2006156.631156.208Oct 29156.813Jun 12
2005156.663156.437Jan 2156.805Aug 20
2004156.512156.331Nov 6156.652Apr 24
2003156.682156.357Nov 20156.919May 13
2002156.578156.422Nov 28156.723Aug 16
2001156.588156.381Nov 17156.811Aug 24
2000156.462156.330Jan 4156.643Oct 6
1999156.470156.200Dec 1156.654May 26
1998156.746156.234Dec 22157.099May 7
1997156.904156.724May 9157.137Aug 12
1996156.694156.260Jan 2157.094Sep 26
1995156.362156.090Nov 9156.528Mar 22
1994156.572156.211Nov 19156.896May 13
1993156.614156.235Oct 27156.869May 9
1992156.758156.428Oct 16157.054May 27
1991156.715156.529Nov 7157.027Jul 27
1990156.667156.396Nov 8156.870Jun 23
1989156.748156.503Nov 10156.900May 25
1988156.704156.451Jan 2157.045Aug 6
1987156.637156.389Nov 21156.777Jun 17
1986156.726156.396Nov 10156.967Jun 10
1985156.750156.501Nov 20156.989Jun 10
1984156.659156.492Jan 1156.842Aug 9
1983156.549156.420Dec 6156.739Aug 24
1982156.442156.223Jan 9156.624Jun 29
1981 (319 days)156.391156.108Nov 7156.647Jun 14
1980156.416156.189Nov 29156.587Apr 12
1979156.685156.287Dec 6156.988Jul 24
1978156.635156.353Nov 8156.817Apr 5
1977 (292 days)156.691156.475Nov 22156.874Aug 9
1976156.747156.472Nov 24156.911Sep 14
1975156.759156.448Nov 1156.948May 27
1974156.777156.533Jan 16157.042Jul 24
1973156.720156.527Jan 1156.929Aug 22
1972 (293 days)156.644156.301Jan 15156.914Aug 14
1971 (307 days)156.550156.314Jan 2156.765Aug 3
1970156.434156.222Nov 30156.618Jul 1
1969156.496156.256Nov 10156.753Jun 3
1968156.625156.283Nov 30156.832Jun 2
1967156.749156.500May 12157.066Jul 19
1966156.754156.573Apr 9157.015Aug 9
1965156.828156.652Dec 24157.100Aug 7
1964156.870156.609May 1157.176Aug 19
1963156.834156.530Nov 17157.112Aug 14
1962156.761156.375Apr 26157.259Sep 1
1961156.767156.381Nov 1157.033Aug 7
1960156.810156.588Apr 20157.115Aug 14
1959156.601156.350Apr 19157.015Aug 6
1958156.671156.286Dec 1157.002Jun 26
1957156.791156.545Feb 18157.115Sep 12
1956 (245 days)156.695156.481Apr 23156.908Jul 30
1955156.821156.603Nov 28157.042Jul 23
1954156.648156.277May 11157.060Aug 25
1953156.450156.207May 9156.725Aug 28
1952156.560156.225Dec 16156.859Aug 6
1951156.632156.280May 1157.015Aug 8
1950 (245 days)156.622156.387Dec 13156.844Aug 3
1949 (304 days)156.796156.658Oct 14156.966Aug 18
1948156.729156.442May 4156.990Aug 30
1947156.520156.112Jan 10156.899Aug 3
1946156.329156.119Dec 31156.649Aug 1
1945156.301156.137Apr 30156.594Jul 18
1944156.397156.228Apr 17156.658Sep 3
1943156.478156.286Nov 29156.865Jul 23
1942156.565156.295Dec 20156.871Jul 2
1941156.481156.210Apr 23156.740Aug 4
1940 (275 days)156.602156.329Dec 20156.881Aug 9
1939156.462156.140Apr 24156.871Aug 15
1938 (214 days)156.553156.222Dec 9156.810Oct 14
1935 (2 days)156.521156.475Jun 6156.567Jun 13
1934 (154 days)156.555156.332Jan 31156.765Mar 31

Levels in metres. Partial years show the number of days with data.

Monthly averages

MonthAverageLowestHighest
January156.504155.939157.127
February156.544155.978157.155
March156.574156.041157.191
April156.585156.038157.208
May156.631156.038157.244
June156.725156.031157.226
July156.767156.071157.248
August156.756156.079157.259
September156.675156.022157.275
October156.567155.933157.233
November156.472155.832157.106
December156.460155.900157.058

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Daily levels as CSV (31,393 rows; credit the original agencies listed below)