Country: Canada
United StatesCanadaUnited Kingdom

St. Mary Reservoir water level history

Daily records since 1951 · Level today: 1,095.638 m

Highest on record
1,103.710 m
Jun 23, 2014
Lowest on record
1,064.210 m
Apr 23, 1951
Today
1,095.638 m
Oct 23, 2026
Years of data
76
since 1951

In short

Across 61 complete years, 2023 had the lowest average level (1,089.359 m) and 1993 the highest (1,101.611 m).

On average the lake is lowest in October (1,095.752 m) and highest in July (1,101.822 m).

St. Mary Reservoir level, all years

Loading chart…

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

Each year's lowest and highest level

1,0621,0731,0841,0951,1061951196119711981199120012011202120261951: lowest 1,064.21 m (1951-04-23), highest 1,099.63 m (1951-07-11), average 1,086.20 m, 254 days measured1952: lowest 1,078.32 m (1952-01-01), highest 1,098.62 m (1952-06-14), average 1,093.84 m, 126 days measured1953: lowest 1,091.70 m (1953-03-31), highest 1,103.37 m (1953-07-13), average 1,097.67 m, 12 days measured1954: lowest 1,094.29 m (1954-12-31), highest 1,102.89 m (1954-07-31), average 1,098.85 m, 12 days measured1955: lowest 1,094.23 m (1955-01-05), highest 1,103.35 m (1955-06-27), average 1,097.87 m, 16 days measured1956: lowest 1,094.30 m (1956-12-08), highest 1,102.97 m (1956-07-03), average 1,097.53 m, 17 days measured1957: lowest 1,094.95 m (1957-10-23), highest 1,102.77 m (1957-06-12), average 1,097.70 m, 15 days measured1958: lowest 1,095.38 m (1958-10-27), highest 1,103.37 m (1958-06-24), average 1,098.49 m, 15 days measured1959: lowest 1,096.94 m (1959-02-28), highest 1,103.08 m (1959-07-20), average 1,099.90 m, 13 days measured1960: lowest 1,092.75 m (1960-10-23), highest 1,103.01 m (1960-07-04), average 1,097.93 m, 15 days measured1961: lowest 1,095.12 m (1961-01-31), highest 1,103.14 m (1961-06-24), average 1,099.89 m, 13 days measured1962: lowest 1,098.83 m (1962-11-11), highest 1,102.18 m (1962-04-28), average 1,100.64 m, 301 days measured1963: lowest 1,097.94 m (1963-10-24), highest 1,103.07 m (1963-07-05), average 1,100.57 m, 347 days measured1964: lowest 1,097.26 m (1964-09-23), highest 1,103.04 m (1964-07-09), average 1,100.11 m, 364 days measured1965: lowest 1,100.20 m (1965-10-13), highest 1,103.01 m (1965-07-22), average 1,101.30 m, 365 days measured1966: lowest 1,099.35 m (1966-10-20), highest 1,103.25 m (1966-07-08), average 1,101.20 m, 365 days measured1967: lowest 1,094.14 m (1967-10-19), highest 1,102.18 m (1967-07-10), average 1,099.38 m, 365 days measured1968: lowest 1,096.55 m (1968-12-06), highest 1,103.01 m (1968-07-09), average 1,100.13 m, 365 days measured1969: lowest 1,096.62 m (1969-09-25), highest 1,102.97 m (1969-06-29), average 1,099.25 m, 357 days measured1970: lowest 1,097.36 m (1970-10-04), highest 1,103.19 m (1970-06-27), average 1,099.49 m, 351 days measured1971: lowest 1,097.23 m (1971-01-27), highest 1,102.97 m (1971-07-06), average 1,100.13 m, 365 days measured1972: lowest 1,097.47 m (1972-10-17), highest 1,102.68 m (1972-07-22), average 1,099.89 m, 366 days measured1973: lowest 1,095.81 m (1973-10-25), highest 1,103.02 m (1973-06-28), average 1,099.43 m, 365 days measured1974: lowest 1,096.22 m (1974-10-17), highest 1,102.75 m (1974-07-09), average 1,099.65 m, 357 days measured1975: lowest 1,097.70 m (1975-10-28), highest 1,102.68 m (1975-06-20), average 1,099.93 m, 360 days measured1976: lowest 1,096.23 m (1976-12-10), highest 1,102.65 m (1976-07-17), average 1,099.69 m, 366 days measured1977: lowest 1,091.14 m (1977-08-23), highest 1,099.38 m (1977-06-14), average 1,096.21 m, 365 days measured1978: lowest 1,097.63 m (1978-01-01), highest 1,103.16 m (1978-07-21), average 1,100.27 m, 365 days measured1979: lowest 1,095.07 m (1979-10-23), highest 1,101.87 m (1979-07-10), average 1,099.31 m, 365 days measured1980: lowest 1,095.56 m (1980-01-01), highest 1,102.78 m (1980-05-26), average 1,097.98 m, 366 days measured1981: lowest 1,097.68 m (1981-01-07), highest 1,103.11 m (1981-05-23), average 1,100.43 m, 365 days measured1982: lowest 1,099.40 m (1982-01-22), highest 1,102.98 m (1982-07-13), average 1,101.26 m, 365 days measured1983: lowest 1,096.88 m (1983-10-11), highest 1,103.06 m (1983-07-21), average 1,100.20 m, 365 days measured1984: lowest 1,091.81 m (1984-10-12), highest 1,102.97 m (1984-07-06), average 1,097.91 m, 366 days measured1985: lowest 1,095.18 m (1985-01-01), highest 1,102.83 m (1985-06-19), average 1,098.91 m, 365 days measured1986: lowest 1,095.94 m (1986-09-11), highest 1,103.22 m (1986-06-23), average 1,100.26 m, 365 days measured1987: lowest 1,098.59 m (1987-01-04), highest 1,103.29 m (1987-06-04), average 1,100.87 m, 365 days measured1988: lowest 1,078.53 m (1988-10-06), highest 1,102.12 m (1988-04-18), average 1,095.56 m, 328 days measured1989: lowest 1,088.09 m (1989-01-01), highest 1,103.07 m (1989-07-04), average 1,096.25 m, 365 days measured1990: lowest 1,097.68 m (1990-10-05), highest 1,103.28 m (1990-07-12), average 1,100.90 m, 355 days measured1991: lowest 1,099.34 m (1991-10-08), highest 1,103.19 m (1991-06-26), average 1,101.02 m, 365 days measured1992: lowest 1,095.38 m (1992-06-12), highest 1,100.78 m (1992-07-27), average 1,099.51 m, 366 days measured1993: lowest 1,100.15 m (1993-01-01), highest 1,103.28 m (1993-06-13), average 1,101.61 m, 365 days measured1994: lowest 1,092.23 m (1994-10-13), highest 1,103.12 m (1994-06-07), average 1,098.85 m, 365 days measured1995: lowest 1,093.76 m (1995-01-01), highest 1,102.73 m (1995-07-05), average 1,098.79 m, 365 days measured1996: lowest 1,089.55 m (1996-10-10), highest 1,102.82 m (1996-07-03), average 1,097.57 m, 366 days measured1997: lowest 1,088.60 m (1997-10-09), highest 1,102.40 m (1997-06-15), average 1,094.71 m, 365 days measured1998: lowest 1,090.11 m (1998-03-11), highest 1,102.98 m (1998-06-20), average 1,094.57 m, 331 days measured1999: lowest 1,091.44 m (1999-10-05), highest 1,102.88 m (1999-07-15), average 1,094.77 m, 365 days measured2000: lowest 1,080.32 m (2000-12-31), highest 1,098.71 m (2000-06-29), average 1,090.10 m, 366 days measured2001: lowest 1,078.67 m (2001-02-26), highest 1,097.58 m (2001-07-05), average 1,084.30 m, 320 days measured2002: lowest 1,080.21 m (2002-01-04), highest 1,103.31 m (2002-07-21), average 1,093.31 m, 365 days measured2003: lowest 1,079.63 m (2003-10-14), highest 1,102.48 m (2003-06-30), average 1,094.97 m, 360 days measured2004: lowest 1,083.01 m (2004-01-05), highest 1,103.10 m (2004-07-13), average 1,094.46 m, 366 days measured2005: lowest 1,100.27 m (2005-01-15), highest 1,103.40 m (2005-06-25), average 1,101.24 m, 365 days measured2006: lowest 1,094.13 m (2006-10-11), highest 1,103.52 m (2006-07-04), average 1,099.87 m, 365 days measured2007: lowest 1,082.03 m (2007-10-10), highest 1,103.32 m (2007-06-25), average 1,095.54 m, 365 days measured2008: lowest 1,084.69 m (2008-05-08), highest 1,103.33 m (2008-07-05), average 1,094.92 m, 366 days measured2009: lowest 1,100.00 m (2009-03-19), highest 1,103.44 m (2009-06-29), average 1,101.28 m, 365 days measured2010: lowest 1,099.61 m (2010-10-28), highest 1,103.56 m (2010-06-17), average 1,101.41 m, 365 days measured2011: lowest 1,098.42 m (2011-10-11), highest 1,103.58 m (2011-07-14), average 1,100.56 m, 365 days measured2012: lowest 1,098.19 m (2012-10-10), highest 1,103.59 m (2012-06-29), average 1,100.81 m, 366 days measured2013: lowest 1,099.91 m (2013-10-08), highest 1,103.49 m (2013-07-06), average 1,101.33 m, 365 days measured2014: lowest 1,099.29 m (2014-10-10), highest 1,103.71 m (2014-06-23), average 1,100.73 m, 365 days measured2015: lowest 1,092.81 m (2015-10-02), highest 1,103.41 m (2015-06-11), average 1,098.73 m, 365 days measured2016: lowest 1,095.10 m (2016-01-01), highest 1,103.53 m (2016-06-16), average 1,099.59 m, 366 days measured2017: lowest 1,080.51 m (2017-09-29), highest 1,103.46 m (2017-06-19), average 1,095.56 m, 342 days measured2018: lowest 1,087.90 m (2018-01-01), highest 1,103.64 m (2018-06-29), average 1,093.99 m, 365 days measured2019: lowest 1,091.86 m (2019-09-29), highest 1,103.58 m (2019-06-23), average 1,095.90 m, 365 days measured2020: lowest 1,095.92 m (2020-10-08), highest 1,103.61 m (2020-07-02), average 1,099.29 m, 366 days measured2021: lowest 1,085.09 m (2021-10-08), highest 1,103.34 m (2021-06-28), average 1,096.28 m, 365 days measured2022: lowest 1,093.54 m (2022-12-24), highest 1,103.55 m (2022-07-09), average 1,096.41 m, 365 days measured2023: lowest 1,075.69 m (2023-11-03), highest 1,101.15 m (2023-06-19), average 1,089.36 m, 365 days measured2024: lowest 1,084.50 m (2024-01-01), highest 1,102.95 m (2024-07-11), average 1,095.02 m, 366 days measured2025: lowest 1,094.13 m (2025-10-09), highest 1,102.14 m (2025-06-06), average 1,098.03 m, 365 days measured2026: lowest 1,095.67 m (2026-10-21), highest 1,098.45 m (2026-09-22), average 1,096.91 m, 30 days measured
1,0621,0731,0841,0951,106195119701989200820261951: lowest 1,064.21 m (1951-04-23), highest 1,099.63 m (1951-07-11), average 1,086.20 m, 254 days measured1952: lowest 1,078.32 m (1952-01-01), highest 1,098.62 m (1952-06-14), average 1,093.84 m, 126 days measured1953: lowest 1,091.70 m (1953-03-31), highest 1,103.37 m (1953-07-13), average 1,097.67 m, 12 days measured1954: lowest 1,094.29 m (1954-12-31), highest 1,102.89 m (1954-07-31), average 1,098.85 m, 12 days measured1955: lowest 1,094.23 m (1955-01-05), highest 1,103.35 m (1955-06-27), average 1,097.87 m, 16 days measured1956: lowest 1,094.30 m (1956-12-08), highest 1,102.97 m (1956-07-03), average 1,097.53 m, 17 days measured1957: lowest 1,094.95 m (1957-10-23), highest 1,102.77 m (1957-06-12), average 1,097.70 m, 15 days measured1958: lowest 1,095.38 m (1958-10-27), highest 1,103.37 m (1958-06-24), average 1,098.49 m, 15 days measured1959: lowest 1,096.94 m (1959-02-28), highest 1,103.08 m (1959-07-20), average 1,099.90 m, 13 days measured1960: lowest 1,092.75 m (1960-10-23), highest 1,103.01 m (1960-07-04), average 1,097.93 m, 15 days measured1961: lowest 1,095.12 m (1961-01-31), highest 1,103.14 m (1961-06-24), average 1,099.89 m, 13 days measured1962: lowest 1,098.83 m (1962-11-11), highest 1,102.18 m (1962-04-28), average 1,100.64 m, 301 days measured1963: lowest 1,097.94 m (1963-10-24), highest 1,103.07 m (1963-07-05), average 1,100.57 m, 347 days measured1964: lowest 1,097.26 m (1964-09-23), highest 1,103.04 m (1964-07-09), average 1,100.11 m, 364 days measured1965: lowest 1,100.20 m (1965-10-13), highest 1,103.01 m (1965-07-22), average 1,101.30 m, 365 days measured1966: lowest 1,099.35 m (1966-10-20), highest 1,103.25 m (1966-07-08), average 1,101.20 m, 365 days measured1967: lowest 1,094.14 m (1967-10-19), highest 1,102.18 m (1967-07-10), average 1,099.38 m, 365 days measured1968: lowest 1,096.55 m (1968-12-06), highest 1,103.01 m (1968-07-09), average 1,100.13 m, 365 days measured1969: lowest 1,096.62 m (1969-09-25), highest 1,102.97 m (1969-06-29), average 1,099.25 m, 357 days measured1970: lowest 1,097.36 m (1970-10-04), highest 1,103.19 m (1970-06-27), average 1,099.49 m, 351 days measured1971: lowest 1,097.23 m (1971-01-27), highest 1,102.97 m (1971-07-06), average 1,100.13 m, 365 days measured1972: lowest 1,097.47 m (1972-10-17), highest 1,102.68 m (1972-07-22), average 1,099.89 m, 366 days measured1973: lowest 1,095.81 m (1973-10-25), highest 1,103.02 m (1973-06-28), average 1,099.43 m, 365 days measured1974: lowest 1,096.22 m (1974-10-17), highest 1,102.75 m (1974-07-09), average 1,099.65 m, 357 days measured1975: lowest 1,097.70 m (1975-10-28), highest 1,102.68 m (1975-06-20), average 1,099.93 m, 360 days measured1976: lowest 1,096.23 m (1976-12-10), highest 1,102.65 m (1976-07-17), average 1,099.69 m, 366 days measured1977: lowest 1,091.14 m (1977-08-23), highest 1,099.38 m (1977-06-14), average 1,096.21 m, 365 days measured1978: lowest 1,097.63 m (1978-01-01), highest 1,103.16 m (1978-07-21), average 1,100.27 m, 365 days measured1979: lowest 1,095.07 m (1979-10-23), highest 1,101.87 m (1979-07-10), average 1,099.31 m, 365 days measured1980: lowest 1,095.56 m (1980-01-01), highest 1,102.78 m (1980-05-26), average 1,097.98 m, 366 days measured1981: lowest 1,097.68 m (1981-01-07), highest 1,103.11 m (1981-05-23), average 1,100.43 m, 365 days measured1982: lowest 1,099.40 m (1982-01-22), highest 1,102.98 m (1982-07-13), average 1,101.26 m, 365 days measured1983: lowest 1,096.88 m (1983-10-11), highest 1,103.06 m (1983-07-21), average 1,100.20 m, 365 days measured1984: lowest 1,091.81 m (1984-10-12), highest 1,102.97 m (1984-07-06), average 1,097.91 m, 366 days measured1985: lowest 1,095.18 m (1985-01-01), highest 1,102.83 m (1985-06-19), average 1,098.91 m, 365 days measured1986: lowest 1,095.94 m (1986-09-11), highest 1,103.22 m (1986-06-23), average 1,100.26 m, 365 days measured1987: lowest 1,098.59 m (1987-01-04), highest 1,103.29 m (1987-06-04), average 1,100.87 m, 365 days measured1988: lowest 1,078.53 m (1988-10-06), highest 1,102.12 m (1988-04-18), average 1,095.56 m, 328 days measured1989: lowest 1,088.09 m (1989-01-01), highest 1,103.07 m (1989-07-04), average 1,096.25 m, 365 days measured1990: lowest 1,097.68 m (1990-10-05), highest 1,103.28 m (1990-07-12), average 1,100.90 m, 355 days measured1991: lowest 1,099.34 m (1991-10-08), highest 1,103.19 m (1991-06-26), average 1,101.02 m, 365 days measured1992: lowest 1,095.38 m (1992-06-12), highest 1,100.78 m (1992-07-27), average 1,099.51 m, 366 days measured1993: lowest 1,100.15 m (1993-01-01), highest 1,103.28 m (1993-06-13), average 1,101.61 m, 365 days measured1994: lowest 1,092.23 m (1994-10-13), highest 1,103.12 m (1994-06-07), average 1,098.85 m, 365 days measured1995: lowest 1,093.76 m (1995-01-01), highest 1,102.73 m (1995-07-05), average 1,098.79 m, 365 days measured1996: lowest 1,089.55 m (1996-10-10), highest 1,102.82 m (1996-07-03), average 1,097.57 m, 366 days measured1997: lowest 1,088.60 m (1997-10-09), highest 1,102.40 m (1997-06-15), average 1,094.71 m, 365 days measured1998: lowest 1,090.11 m (1998-03-11), highest 1,102.98 m (1998-06-20), average 1,094.57 m, 331 days measured1999: lowest 1,091.44 m (1999-10-05), highest 1,102.88 m (1999-07-15), average 1,094.77 m, 365 days measured2000: lowest 1,080.32 m (2000-12-31), highest 1,098.71 m (2000-06-29), average 1,090.10 m, 366 days measured2001: lowest 1,078.67 m (2001-02-26), highest 1,097.58 m (2001-07-05), average 1,084.30 m, 320 days measured2002: lowest 1,080.21 m (2002-01-04), highest 1,103.31 m (2002-07-21), average 1,093.31 m, 365 days measured2003: lowest 1,079.63 m (2003-10-14), highest 1,102.48 m (2003-06-30), average 1,094.97 m, 360 days measured2004: lowest 1,083.01 m (2004-01-05), highest 1,103.10 m (2004-07-13), average 1,094.46 m, 366 days measured2005: lowest 1,100.27 m (2005-01-15), highest 1,103.40 m (2005-06-25), average 1,101.24 m, 365 days measured2006: lowest 1,094.13 m (2006-10-11), highest 1,103.52 m (2006-07-04), average 1,099.87 m, 365 days measured2007: lowest 1,082.03 m (2007-10-10), highest 1,103.32 m (2007-06-25), average 1,095.54 m, 365 days measured2008: lowest 1,084.69 m (2008-05-08), highest 1,103.33 m (2008-07-05), average 1,094.92 m, 366 days measured2009: lowest 1,100.00 m (2009-03-19), highest 1,103.44 m (2009-06-29), average 1,101.28 m, 365 days measured2010: lowest 1,099.61 m (2010-10-28), highest 1,103.56 m (2010-06-17), average 1,101.41 m, 365 days measured2011: lowest 1,098.42 m (2011-10-11), highest 1,103.58 m (2011-07-14), average 1,100.56 m, 365 days measured2012: lowest 1,098.19 m (2012-10-10), highest 1,103.59 m (2012-06-29), average 1,100.81 m, 366 days measured2013: lowest 1,099.91 m (2013-10-08), highest 1,103.49 m (2013-07-06), average 1,101.33 m, 365 days measured2014: lowest 1,099.29 m (2014-10-10), highest 1,103.71 m (2014-06-23), average 1,100.73 m, 365 days measured2015: lowest 1,092.81 m (2015-10-02), highest 1,103.41 m (2015-06-11), average 1,098.73 m, 365 days measured2016: lowest 1,095.10 m (2016-01-01), highest 1,103.53 m (2016-06-16), average 1,099.59 m, 366 days measured2017: lowest 1,080.51 m (2017-09-29), highest 1,103.46 m (2017-06-19), average 1,095.56 m, 342 days measured2018: lowest 1,087.90 m (2018-01-01), highest 1,103.64 m (2018-06-29), average 1,093.99 m, 365 days measured2019: lowest 1,091.86 m (2019-09-29), highest 1,103.58 m (2019-06-23), average 1,095.90 m, 365 days measured2020: lowest 1,095.92 m (2020-10-08), highest 1,103.61 m (2020-07-02), average 1,099.29 m, 366 days measured2021: lowest 1,085.09 m (2021-10-08), highest 1,103.34 m (2021-06-28), average 1,096.28 m, 365 days measured2022: lowest 1,093.54 m (2022-12-24), highest 1,103.55 m (2022-07-09), average 1,096.41 m, 365 days measured2023: lowest 1,075.69 m (2023-11-03), highest 1,101.15 m (2023-06-19), average 1,089.36 m, 365 days measured2024: lowest 1,084.50 m (2024-01-01), highest 1,102.95 m (2024-07-11), average 1,095.02 m, 366 days measured2025: lowest 1,094.13 m (2025-10-09), highest 1,102.14 m (2025-06-06), average 1,098.03 m, 365 days measured2026: lowest 1,095.67 m (2026-10-21), highest 1,098.45 m (2026-09-22), average 1,096.91 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.

  • 20231,075.690 m on Nov 3
  • 20031,079.630 m on Oct 14
  • 20021,080.210 m on Jan 4
  • 20001,080.320 m on Dec 31
  • 20171,080.510 m on Sep 29

Yearly highs and lows

YearAverageLowLow dateHighHigh date
2026 (30 days)1,096.9071,095.670Oct 211,098.447Sep 22
20251,098.0261,094.130Oct 91,102.140Jun 6
20241,095.0191,084.500Jan 11,102.950Jul 11
20231,089.3591,075.690Nov 31,101.150Jun 19
20221,096.4141,093.540Dec 241,103.550Jul 9
20211,096.2841,085.090Oct 81,103.340Jun 28
20201,099.2871,095.920Oct 81,103.610Jul 2
20191,095.8971,091.860Sep 291,103.580Jun 23
20181,093.9901,087.900Jan 11,103.640Jun 29
20171,095.5601,080.510Sep 291,103.460Jun 19
20161,099.5931,095.100Jan 11,103.530Jun 16
20151,098.7321,092.810Oct 21,103.410Jun 11
20141,100.7301,099.290Oct 101,103.710Jun 23
20131,101.3311,099.910Oct 81,103.490Jul 6
20121,100.8091,098.190Oct 101,103.590Jun 29
20111,100.5571,098.420Oct 111,103.580Jul 14
20101,101.4061,099.610Oct 281,103.560Jun 17
20091,101.2791,100.000Mar 191,103.440Jun 29
20081,094.9211,084.690May 81,103.330Jul 5
20071,095.5401,082.030Oct 101,103.320Jun 25
20061,099.8661,094.130Oct 111,103.520Jul 4
20051,101.2381,100.270Jan 151,103.400Jun 25
20041,094.4581,083.010Jan 51,103.100Jul 13
20031,094.9721,079.630Oct 141,102.480Jun 30
20021,093.3071,080.210Jan 41,103.310Jul 21
2001 (320 days)1,084.2991,078.670Feb 261,097.580Jul 5
20001,090.1021,080.320Dec 311,098.710Jun 29
19991,094.7721,091.440Oct 51,102.880Jul 15
19981,094.5691,090.110Mar 111,102.980Jun 20
19971,094.7081,088.600Oct 91,102.400Jun 15
19961,097.5651,089.550Oct 101,102.820Jul 3
19951,098.7921,093.760Jan 11,102.730Jul 5
19941,098.8501,092.230Oct 131,103.120Jun 7
19931,101.6111,100.150Jan 11,103.280Jun 13
19921,099.5101,095.380Jun 121,100.780Jul 27
19911,101.0161,099.340Oct 81,103.190Jun 26
19901,100.8961,097.680Oct 51,103.280Jul 12
19891,096.2521,088.090Jan 11,103.070Jul 4
1988 (328 days)1,095.5561,078.530Oct 61,102.120Apr 18
19871,100.8741,098.590Jan 41,103.290Jun 4
19861,100.2561,095.940Sep 111,103.220Jun 23
19851,098.9091,095.180Jan 11,102.830Jun 19
19841,097.9121,091.810Oct 121,102.970Jul 6
19831,100.1991,096.880Oct 111,103.060Jul 21
19821,101.2631,099.400Jan 221,102.980Jul 13
19811,100.4341,097.680Jan 71,103.110May 23
19801,097.9771,095.560Jan 11,102.780May 26
19791,099.3121,095.070Oct 231,101.870Jul 10
19781,100.2721,097.630Jan 11,103.160Jul 21
19771,096.2081,091.140Aug 231,099.380Jun 14
19761,099.6931,096.230Dec 101,102.650Jul 17
19751,099.9331,097.700Oct 281,102.680Jun 20
19741,099.6451,096.220Oct 171,102.750Jul 9
19731,099.4291,095.810Oct 251,103.020Jun 28
19721,099.8931,097.470Oct 171,102.680Jul 22
19711,100.1311,097.230Jan 271,102.970Jul 6
19701,099.4881,097.360Oct 41,103.190Jun 27
19691,099.2481,096.620Sep 251,102.970Jun 29
19681,100.1261,096.550Dec 61,103.010Jul 9
19671,099.3831,094.140Oct 191,102.180Jul 10
19661,101.2021,099.350Oct 201,103.250Jul 8
19651,101.3041,100.200Oct 131,103.010Jul 22
19641,100.1081,097.260Sep 231,103.040Jul 9
19631,100.5721,097.940Oct 241,103.070Jul 5
1962 (301 days)1,100.6431,098.830Nov 111,102.180Apr 28
1961 (13 days)1,099.8951,095.120Jan 311,103.140Jun 24
1960 (15 days)1,097.9271,092.750Oct 231,103.010Jul 4
1959 (13 days)1,099.8981,096.940Feb 281,103.080Jul 20
1958 (15 days)1,098.4911,095.380Oct 271,103.370Jun 24
1957 (15 days)1,097.6981,094.950Oct 231,102.770Jun 12
1956 (17 days)1,097.5311,094.300Dec 81,102.970Jul 3
1955 (16 days)1,097.8651,094.230Jan 51,103.350Jun 27
1954 (12 days)1,098.8521,094.290Dec 311,102.890Jul 31
1953 (12 days)1,097.6651,091.700Mar 311,103.370Jul 13
1952 (126 days)1,093.8421,078.320Jan 11,098.620Jun 14
1951 (254 days)1,086.2021,064.210Apr 231,099.630Jul 11

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

Monthly averages

MonthAverageLowestHighest
January1,096.6881,078.3201,101.760
February1,096.8581,078.6701,101.710
March1,097.5091,065.2801,101.970
April1,097.8841,064.2101,102.180
May1,099.4311,072.7401,103.340
June1,101.5061,091.4601,103.710
July1,101.8221,088.2901,103.630
August1,099.4671,079.7901,103.360
September1,097.0141,079.0501,102.930
October1,095.7521,076.1801,102.550
November1,095.7881,066.2501,102.180
December1,096.2541,064.5101,101.870

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Daily levels as CSV (23,639 rows; credit the original agencies listed below)