Vallecito Dam Weather Records (USC00058582)
Record envelope, standing records and threshold days for Vallecito Dam (USC00058582), Colorado, United States, with 110 years of record.
Key Facts for Vallecito Dam
- Vallecito Dam (USC00058582) is a weather station in Colorado, United States at 37.38 latitude and -107.58 longitude, 2,330 m (7,644 ft) above sea level.
- The station reports from 1917 to 2026, 110 years of record.
- 1,464 records set at Vallecito Dam still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Vallecito Dam tied a daily record high maximum temperature of 30.0 C (86.0 F) on 27 August 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Colorado, United States, 37.38 latitude, -107.58 longitude.
- Elevation: 2,330 m (7,644 ft).
- Period of record: 1917 to 2026, 110 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
24 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 16.7 C (62.1 F) | -37.2 C (-35.0 F) | 12.2 C (54.0 F) | -17.2 C (1.0 F) |
| Feb | 17.2 C (63.0 F) | -35.0 C (-31.0 F) | 16.1 C (61.0 F) | -19.4 C (-2.9 F) |
| Mar | 21.7 C (71.1 F) | -29.4 C (-20.9 F) | 20.0 C (68.0 F) | -8.9 C (16.0 F) |
| Apr | 26.1 C (79.0 F) | -21.1 C (-6.0 F) | 21.1 C (70.0 F) | -8.3 C (17.1 F) |
| May | 30.6 C (87.1 F) | -9.4 C (15.1 F) | 27.8 C (82.0 F) | -3.3 C (26.1 F) |
| Jun | 33.3 C (91.9 F) | -6.7 C (19.9 F) | 32.2 C (90.0 F) | 4.4 C (39.9 F) |
| Jul | 34.4 C (93.9 F) | 0.0 C (32.0 F) | 33.3 C (91.9 F) | 3.3 C (37.9 F) |
| Aug | 33.9 C (93.0 F) | -2.2 C (28.0 F) | 33.9 C (93.0 F) | 7.8 C (46.0 F) |
| Sep | 32.2 C (90.0 F) | -5.6 C (21.9 F) | 22.2 C (72.0 F) | 3.3 C (37.9 F) |
| Oct | 27.8 C (82.0 F) | -16.7 C (1.9 F) | n/a | n/a |
| Nov | 21.1 C (70.0 F) | -23.3 C (-9.9 F) | n/a | n/a |
| Dec | 16.7 C (62.1 F) | -30.0 C (-22.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1917 | 38 |
| 1942 | 9 |
| 1943 | 17 |
| 1944 | 14 |
| 1945 | 23 |
| 1946 | 31 |
| 1947 | 23 |
| 1948 | 23 |
| 1949 | 20 |
| 1950 | 30 |
| 1951 | 24 |
| 1952 | 21 |
| 1953 | 10 |
| 1954 | 19 |
| 1955 | 16 |
| 1956 | 28 |
| 1957 | 14 |
| 1958 | 16 |
| 1959 | 15 |
| 1960 | 18 |
| 1961 | 9 |
| 1962 | 21 |
| 1963 | 16 |
| 1964 | 11 |
| 1965 | 27 |
| 1966 | 24 |
| 1967 | 15 |
| 1968 | 10 |
| 1969 | 21 |
| 1970 | 15 |
| 1971 | 34 |
| 1972 | 18 |
| 1973 | 20 |
| 1974 | 13 |
| 1975 | 29 |
| 1976 | 14 |
| 1977 | 11 |
| 1978 | 16 |
| 1979 | 19 |
| 1980 | 17 |
| 1981 | 16 |
| 1982 | 16 |
| 1983 | 12 |
| 1984 | 19 |
| 1985 | 17 |
| 1986 | 21 |
| 1987 | 10 |
| 1988 | 10 |
| 1989 | 14 |
| 1990 | 42 |
| 1991 | 25 |
| 1992 | 33 |
| 1993 | 19 |
| 1994 | 11 |
| 1995 | 17 |
| 1996 | 17 |
| 1997 | 5 |
| 1998 | 10 |
| 1999 | 19 |
| 2000 | 20 |
| 2001 | 7 |
| 2002 | 15 |
| 2003 | 20 |
| 2004 | 13 |
| 2005 | 6 |
| 2006 | 19 |
| 2007 | 11 |
| 2008 | 14 |
| 2009 | 13 |
| 2010 | 11 |
| 2011 | 13 |
| 2012 | 7 |
| 2013 | 12 |
| 2014 | 4 |
| 2015 | 14 |
| 2016 | 6 |
| 2017 | 16 |
| 2018 | 17 |
| 2019 | 17 |
| 2020 | 19 |
| 2021 | 19 |
| 2022 | 10 |
| 2023 | 14 |
| 2024 | 10 |
| 2025 | 15 |
| 2026 | 20 |
All-Time Record Progression
11 new records| Date | Kind | Detail |
|---|---|---|
| 1972-10-19 | Record daily precipitation | Record daily precipitation 80.0 mm (3.1 in) |
| 1988-01-17 | Record daily snowfall | Record daily snowfall 61.0 cm (24.0 in) |
| 1990-12-22 | Record low maximum temperature | Record low maximum temperature -13.9 C (7.0 F) |
| 1990-12-23 | Record low maximum temperature | Record low maximum temperature -15.6 C (3.9 F) |
| 1997-01-13 | Record daily snowfall | Record daily snowfall 81.3 cm (32.0 in) |
| 2002-07-02 | Record high maximum temperature | Record high maximum temperature 33.9 C (93.0 F) |
| 2007-12-01 | Record daily precipitation | Record daily precipitation 83.8 mm (3.3 in) |
| 2008-02-04 | Record snow depth | Record snow depth 134.6 cm (53.0 in) |
| 2019-02-22 | Record snow depth | Record snow depth 139.7 cm (55.0 in) |
| 2019-02-23 | Record snow depth | Record snow depth 142.2 cm (56.0 in) |
| 2021-07-11 | Record high maximum temperature | Record high maximum temperature 34.4 C (93.9 F) |
Wettest Day of Each Month
Dec: 83.8 mm (3.3 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 76.2 mm (3.0 in) | 13 January 1997 |
| Feb | 48.3 mm (1.9 in) | 23 February 2015 |
| Mar | 38.9 mm (1.5 in) | 5 March 1995 |
| Apr | 51.6 mm (2.0 in) | 1 April 1986 |
| May | 40.6 mm (1.6 in) | 22 May 2021 |
| Jun | 49.8 mm (2.0 in) | 3 June 1952 |
| Jul | 50.3 mm (2.0 in) | 23 July 1954 |
| Aug | 70.6 mm (2.8 in) | 4 August 1969 |
| Sep | 69.1 mm (2.7 in) | 11 September 2002 |
| Oct | 80.0 mm (3.1 in) | 19 October 1972 |
| Nov | 49.8 mm (2.0 in) | 11 November 1994 |
| Dec | 83.8 mm (3.3 in) | 1 December 2007 |
Period of Record Coverage
1917 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1917 | 257 | 70% | No |
| 1942 | 117 | 32% | No |
| 1943 | 364 | 100% | Yes |
| 1944 | 366 | 100% | Yes |
| 1945 | 361 | 99% | Yes |
| 1946 | 354 | 97% | Yes |
| 1947 | 364 | 100% | Yes |
| 1948 | 366 | 100% | Yes |
| 1949 | 364 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 364 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 362 | 99% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 364 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 364 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 362 | 99% | Yes |
| 1984 | 304 | 83% | No |
| 1985 | 365 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 364 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 364 | 100% | Yes |
| 1992 | 365 | 100% | Yes |
| 1993 | 360 | 99% | Yes |
| 1994 | 359 | 98% | Yes |
| 1995 | 345 | 95% | Yes |
| 1996 | 360 | 98% | Yes |
| 1997 | 363 | 99% | Yes |
| 1998 | 363 | 99% | Yes |
| 1999 | 363 | 99% | Yes |
| 2000 | 302 | 83% | No |
| 2001 | 364 | 100% | Yes |
| 2002 | 355 | 97% | Yes |
| 2003 | 364 | 100% | Yes |
| 2004 | 362 | 99% | Yes |
| 2005 | 364 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 364 | 100% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 349 | 96% | Yes |
| 2016 | 364 | 99% | Yes |
| 2017 | 361 | 99% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 364 | 100% | Yes |
| 2022 | 362 | 99% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 353 | 97% | Yes |
| 2026 | 232 | 64% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 27 August 2026 | Vallecito Dam, US | daily high max (Tie, Provisional) | 30.0 C (86.0 F) | tie | 24 years | 4 of 100 (Routine) |
| 22 August 2026 | Vallecito Dam, US | daily high min (Provisional) | 13.3 C (55.9 F) | 0.5 C (0.9 F) | 23 years | 17 of 100 (Routine) |
| 22 August 2026 | Vallecito Dam, US | daily high max (Provisional) | 32.2 C (90.0 F) | 1.1 C (2.0 F) | 7 years | 15 of 100 (Routine) |
| 21 August 2026 | Vallecito Dam, US | daily high max (Provisional) | 32.2 C (90.0 F) | 0.5 C (0.9 F) | 65 years | 30 of 100 (Routine) |
| 19 August 2026 | Vallecito Dam, US | daily high max (Tie, Provisional) | 30.6 C (87.1 F) | tie | 80 years | 8 of 100 (Routine) |
| 10 August 2026 | Vallecito Dam, US | daily high max | 31.7 C (89.1 F) | 0.6 C (1.1 F) | 45 years | 24 of 100 (Routine) |
| 9 August 2026 | Vallecito Dam, US | daily high max (Tie) | 32.2 C (90.0 F) | tie | 8 years | 3 of 100 (Routine) |
| 8 August 2026 | Vallecito Dam, US | daily high max | 33.3 C (91.9 F) | 1.1 C (2.0 F) | 8 years | 15 of 100 (Routine) |
| 7 August 2026 | Vallecito Dam, US | daily high max (Tie) | 32.2 C (90.0 F) | tie | 65 years | 7 of 100 (Routine) |
| 6 August 2026 | Vallecito Dam, US | daily high max | 33.3 C (91.9 F) | 1.1 C (2.0 F) | 44 years | 26 of 100 (Routine) |
| 5 August 2026 | Vallecito Dam, US | daily high max | 32.8 C (91.0 F) | 0.6 C (1.1 F) | 44 years | 24 of 100 (Routine) |
| 4 August 2026 | Vallecito Dam, US | daily high max | 33.3 C (91.9 F) | 1.1 C (2.0 F) | 47 years | 27 of 100 (Routine) |
| 3 August 2026 | Vallecito Dam, US | daily high max | 32.8 C (91.0 F) | 1.1 C (2.0 F) | 79 years | 36 of 100 (Notable) |
| 2 August 2026 | Vallecito Dam, US | daily high max | 32.2 C (90.0 F) | 1.1 C (2.0 F) | 79 years | 36 of 100 (Notable) |
| 1 August 2026 | Vallecito Dam, US | monthly high max | 33.9 C (93.0 F) | 1.1 C (2.0 F) | 23 years | 30 of 100 (Routine) |
| 29 July 2026 | Vallecito Dam, US | daily high max | 33.3 C (91.9 F) | 0.5 C (0.9 F) | 75 years | 33 of 100 (Routine) |
| 22 July 2026 | Vallecito Dam, US | daily high max (Tie) | 31.7 C (89.1 F) | tie | 29 years | 4 of 100 (Routine) |
| 18 July 2026 | Vallecito Dam, US | daily rain | 18.5 mm (0.7 in) | 3.3 mm (0.13 in) | 72 years | 20 of 100 (Routine) |
| 14 May 2026 | Vallecito Dam, US | daily high max | 26.7 C (80.1 F) | 0.6 C (1.1 F) | 29 years | 19 of 100 (Routine) |
| 13 May 2026 | Vallecito Dam, US | daily high max | 27.8 C (82.0 F) | 0.6 C (1.1 F) | 41 years | 23 of 100 (Routine) |
Climate Trend
78 complete years, 1943 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1943 | 7.7 C | +1.49 C |
| 1944 | 5.5 C | -0.65 C |
| 1945 | 5.5 C | -0.65 C |
| 1947 | 6.6 C | +0.39 C |
| 1948 | 6.0 C | -0.17 C |
| 1949 | 6.0 C | -0.21 C |
| 1950 | 7.2 C | +1.06 C |
| 1951 | 6.2 C | -0.02 C |
| 1952 | 5.7 C | -0.52 C |
| 1953 | 6.5 C | +0.31 C |
| 1954 | 7.6 C | +1.44 C |
| 1955 | 5.7 C | -0.50 C |
| 1956 | 6.6 C | +0.44 C |
| 1957 | 5.7 C | -0.47 C |
| 1958 | 6.9 C | +0.72 C |
| 1959 | 6.8 C | +0.63 C |
| 1960 | 6.0 C | -0.18 C |
| 1961 | 5.8 C | -0.35 C |
| 1962 | 6.5 C | +0.36 C |
| 1963 | 6.6 C | +0.43 C |
| 1964 | 5.0 C | -1.20 C |
| 1965 | 5.6 C | -0.56 C |
| 1966 | 6.2 C | -0.01 C |
| 1967 | 6.3 C | +0.09 C |
| 1968 | 5.6 C | -0.60 C |
| 1969 | 6.0 C | -0.18 C |
| 1970 | 5.7 C | -0.50 C |
| 1971 | 5.5 C | -0.65 C |
| 1972 | 6.4 C | +0.26 C |
| 1973 | 4.8 C | -1.34 C |
| 1974 | 5.4 C | -0.76 C |
| 1975 | 4.4 C | -1.81 C |
| 1976 | 5.7 C | -0.51 C |
| 1977 | 6.4 C | +0.23 C |
| 1978 | 6.0 C | -0.22 C |
| 1979 | 5.3 C | -0.92 C |
| 1980 | 6.5 C | +0.28 C |
| 1981 | 7.5 C | +1.32 C |
| 1982 | 5.4 C | -0.82 C |
| 1983 | 6.0 C | -0.14 C |
| 1985 | 5.8 C | -0.36 C |
| 1986 | 6.5 C | +0.29 C |
| 1987 | 5.8 C | -0.41 C |
| 1988 | 5.6 C | -0.57 C |
| 1989 | 6.4 C | +0.26 C |
| 1990 | 3.8 C | -2.41 C |
| 1991 | 3.8 C | -2.42 C |
| 1992 | 3.8 C | -2.34 C |
| 1993 | 3.7 C | -2.45 C |
| 1994 | 4.6 C | -1.58 C |
| 1996 | 6.4 C | +0.27 C |
| 1997 | 5.6 C | -0.61 C |
| 1998 | 6.0 C | -0.14 C |
| 1999 | 6.8 C | +0.60 C |
| 2001 | 6.5 C | +0.35 C |
| 2002 | 7.0 C | +0.82 C |
| 2003 | 7.4 C | +1.20 C |
| 2004 | 6.1 C | -0.11 C |
| 2005 | 6.7 C | +0.56 C |
| 2006 | 6.5 C | +0.32 C |
| 2007 | 6.6 C | +0.41 C |
| 2008 | 5.5 C | -0.65 C |
| 2009 | 6.0 C | -0.20 C |
| 2010 | 6.0 C | -0.18 C |
| 2011 | 6.3 C | +0.12 C |
| 2012 | 7.5 C | +1.36 C |
| 2013 | 6.1 C | -0.11 C |
| 2014 | 7.3 C | +1.16 C |
| 2016 | 7.1 C | +0.88 C |
| 2017 | 8.0 C | +1.87 C |
| 2018 | 7.6 C | +1.42 C |
| 2019 | 5.7 C | -0.43 C |
| 2020 | 7.5 C | +1.28 C |
| 2021 | 7.5 C | +1.29 C |
| 2022 | 7.0 C | +0.85 C |
| 2023 | 6.5 C | +0.34 C |
| 2024 | 7.6 C | +1.46 C |
| 2025 | 8.2 C | +2.02 C |
The annual mean temperature here has risen by 0.10 C (0.01 to 0.18) per decade over 1943 to 2025. In Fahrenheit: 0.17 F (0.01 to 0.33) per decade. The slope is a straight line fitted to 78 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.10 C (0.01 to 0.18) per decade | 0.17 F (0.01 to 0.33) per decade | 1943 to 2025 | 78 | Rise |
| Mean daily maximum | -0.01 C (-0.12 to 0.09) per decade | -0.03 F (-0.21 to 0.16) per decade | 1943 to 2025 | 78 | Not clearly different from zero |
| Mean daily minimum | 0.2 C (0.1 to 0.3) per decade | 0.4 F (0.2 to 0.5) per decade | 1943 to 2025 | 78 | Rise |
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1917 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 34.4 C (93.9 F) | 2021 | 31.7 C (89.1 F) | 86 |
| Coldest night (TNn) | -37.2 C (-35.0 F) | 1963 | -26.4 C (-15.5 F) | 86 |
| Wettest day (Rx1day) | 83.8 mm (3.3 in) | 2007 | 42.1 mm (1.7 in) | 86 |
| Wettest five days (Rx5day) | 196.6 mm (7.7 in) | 2025 | 74.9 mm (3.0 in) | 86 |
| Longest dry spell (CDD) | 103 days | 1988 | 29 days | 86 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1917 | 30.0 C (86.0 F) |
| 1942 | 28.9 C (84.0 F) |
| 1943 | 31.1 C (88.0 F) |
| 1944 | 31.1 C (88.0 F) |
| 1945 | 32.2 C (90.0 F) |
| 1946 | 32.2 C (90.0 F) |
| 1947 | 33.3 C (91.9 F) |
| 1948 | 31.7 C (89.1 F) |
| 1949 | 31.1 C (88.0 F) |
| 1950 | 32.2 C (90.0 F) |
| 1951 | 32.8 C (91.0 F) |
| 1952 | 31.1 C (88.0 F) |
| 1953 | 33.3 C (91.9 F) |
| 1954 | 33.3 C (91.9 F) |
| 1955 | 31.7 C (89.1 F) |
| 1956 | 32.2 C (90.0 F) |
| 1957 | 31.7 C (89.1 F) |
| 1958 | 33.3 C (91.9 F) |
| 1959 | 32.8 C (91.0 F) |
| 1960 | 32.2 C (90.0 F) |
| 1961 | 31.1 C (88.0 F) |
| 1962 | 32.2 C (90.0 F) |
| 1963 | 32.8 C (91.0 F) |
| 1964 | 32.2 C (90.0 F) |
| 1965 | 29.4 C (84.9 F) |
| 1966 | 31.7 C (89.1 F) |
| 1967 | 31.7 C (89.1 F) |
| 1968 | 31.7 C (89.1 F) |
| 1969 | 30.0 C (86.0 F) |
| 1970 | 31.1 C (88.0 F) |
| 1971 | 32.8 C (91.0 F) |
| 1972 | 33.3 C (91.9 F) |
| 1973 | 31.7 C (89.1 F) |
| 1974 | 32.8 C (91.0 F) |
| 1975 | 29.4 C (84.9 F) |
| 1976 | 31.7 C (89.1 F) |
| 1977 | 31.1 C (88.0 F) |
| 1978 | 33.3 C (91.9 F) |
| 1979 | 32.2 C (90.0 F) |
| 1980 | 31.7 C (89.1 F) |
| 1981 | 33.3 C (91.9 F) |
| 1982 | 31.7 C (89.1 F) |
| 1983 | 30.0 C (86.0 F) |
| 1984 | 28.3 C (82.9 F) |
| 1985 | 31.7 C (89.1 F) |
| 1986 | 31.1 C (88.0 F) |
| 1987 | 31.1 C (88.0 F) |
| 1988 | 30.6 C (87.1 F) |
| 1989 | 33.3 C (91.9 F) |
| 1990 | 31.1 C (88.0 F) |
| 1991 | 27.8 C (82.0 F) |
| 1992 | 27.2 C (81.0 F) |
| 1993 | 28.9 C (84.0 F) |
| 1994 | 28.9 C (84.0 F) |
| 1995 | 31.7 C (89.1 F) |
| 1996 | 31.7 C (89.1 F) |
| 1997 | 30.6 C (87.1 F) |
| 1998 | 31.7 C (89.1 F) |
| 1999 | 30.6 C (87.1 F) |
| 2000 | 31.7 C (89.1 F) |
| 2001 | 31.7 C (89.1 F) |
| 2002 | 33.9 C (93.0 F) |
| 2003 | 33.3 C (91.9 F) |
| 2004 | 30.6 C (87.1 F) |
| 2005 | 32.8 C (91.0 F) |
| 2006 | 31.1 C (88.0 F) |
| 2007 | 32.2 C (90.0 F) |
| 2008 | 30.0 C (86.0 F) |
| 2009 | 30.6 C (87.1 F) |
| 2010 | 33.9 C (93.0 F) |
| 2011 | 31.1 C (88.0 F) |
| 2012 | 32.2 C (90.0 F) |
| 2013 | 32.2 C (90.0 F) |
| 2014 | 31.7 C (89.1 F) |
| 2015 | 30.6 C (87.1 F) |
| 2016 | 32.8 C (91.0 F) |
| 2017 | 31.1 C (88.0 F) |
| 2018 | 33.3 C (91.9 F) |
| 2019 | 31.7 C (89.1 F) |
| 2020 | 33.3 C (91.9 F) |
| 2021 | 34.4 C (93.9 F) |
| 2022 | 33.3 C (91.9 F) |
| 2023 | 33.3 C (91.9 F) |
| 2024 | 32.2 C (90.0 F) |
| 2025 | 32.2 C (90.0 F) |
| 2026 | 33.9 C (93.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1917 | -19.4 C (-2.9 F) |
| 1942 | -16.1 C (3.0 F) |
| 1943 | -31.1 C (-24.0 F) |
| 1944 | -28.3 C (-18.9 F) |
| 1945 | -27.2 C (-17.0 F) |
| 1946 | -28.3 C (-18.9 F) |
| 1947 | -28.9 C (-20.0 F) |
| 1948 | -30.6 C (-23.1 F) |
| 1949 | -31.7 C (-25.1 F) |
| 1950 | -26.7 C (-16.1 F) |
| 1951 | -35.0 C (-31.0 F) |
| 1952 | -28.3 C (-18.9 F) |
| 1953 | -27.8 C (-18.0 F) |
| 1954 | -20.6 C (-5.1 F) |
| 1955 | -32.8 C (-27.0 F) |
| 1956 | -28.3 C (-18.9 F) |
| 1957 | -26.1 C (-15.0 F) |
| 1958 | -26.1 C (-15.0 F) |
| 1959 | -23.3 C (-9.9 F) |
| 1960 | -28.3 C (-18.9 F) |
| 1961 | -27.8 C (-18.0 F) |
| 1962 | -30.0 C (-22.0 F) |
| 1963 | -37.2 C (-35.0 F) |
| 1964 | -27.8 C (-18.0 F) |
| 1965 | -31.7 C (-25.1 F) |
| 1966 | -29.4 C (-20.9 F) |
| 1967 | -25.0 C (-13.0 F) |
| 1968 | -28.9 C (-20.0 F) |
| 1969 | -25.6 C (-14.1 F) |
| 1970 | -22.8 C (-9.0 F) |
| 1971 | -34.4 C (-29.9 F) |
| 1972 | -23.9 C (-11.0 F) |
| 1973 | -25.0 C (-13.0 F) |
| 1974 | -27.8 C (-18.0 F) |
| 1975 | -31.1 C (-24.0 F) |
| 1976 | -30.0 C (-22.0 F) |
| 1977 | -28.9 C (-20.0 F) |
| 1978 | -28.3 C (-18.9 F) |
| 1979 | -32.2 C (-26.0 F) |
| 1980 | -23.3 C (-9.9 F) |
| 1981 | -19.4 C (-2.9 F) |
| 1982 | -30.0 C (-22.0 F) |
| 1983 | -22.2 C (-8.0 F) |
| 1984 | -33.3 C (-27.9 F) |
| 1985 | -31.7 C (-25.1 F) |
| 1986 | -23.3 C (-9.9 F) |
| 1987 | -26.7 C (-16.1 F) |
| 1988 | -25.0 C (-13.0 F) |
| 1989 | -28.3 C (-18.9 F) |
| 1990 | -30.0 C (-22.0 F) |
| 1991 | -24.4 C (-11.9 F) |
| 1992 | -24.4 C (-11.9 F) |
| 1993 | -26.1 C (-15.0 F) |
| 1994 | -28.3 C (-18.9 F) |
| 1995 | -25.0 C (-13.0 F) |
| 1996 | -25.6 C (-14.1 F) |
| 1997 | -27.8 C (-18.0 F) |
| 1998 | -25.6 C (-14.1 F) |
| 1999 | -17.8 C (0.0 F) |
| 2000 | -21.1 C (-6.0 F) |
| 2001 | -25.6 C (-14.1 F) |
| 2002 | -23.9 C (-11.0 F) |
| 2003 | -23.9 C (-11.0 F) |
| 2004 | -27.8 C (-18.0 F) |
| 2005 | -20.0 C (-4.0 F) |
| 2006 | -20.6 C (-5.1 F) |
| 2007 | -27.8 C (-18.0 F) |
| 2008 | -28.9 C (-20.0 F) |
| 2009 | -25.0 C (-13.0 F) |
| 2010 | -23.3 C (-9.9 F) |
| 2011 | -30.6 C (-23.1 F) |
| 2012 | -22.8 C (-9.0 F) |
| 2013 | -28.9 C (-20.0 F) |
| 2014 | -20.0 C (-4.0 F) |
| 2015 | -19.4 C (-2.9 F) |
| 2016 | -25.6 C (-14.1 F) |
| 2017 | -21.7 C (-7.1 F) |
| 2018 | -23.3 C (-9.9 F) |
| 2019 | -26.7 C (-16.1 F) |
| 2020 | -22.2 C (-8.0 F) |
| 2021 | -27.8 C (-18.0 F) |
| 2022 | -25.6 C (-14.1 F) |
| 2023 | -25.6 C (-14.1 F) |
| 2024 | -25.0 C (-13.0 F) |
| 2025 | -20.6 C (-5.1 F) |
| 2026 | -19.4 C (-2.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1917 | 24.1 mm (0.9 in) |
| 1942 | 31.8 mm (1.3 in) |
| 1943 | 54.6 mm (2.1 in) |
| 1944 | 38.1 mm (1.5 in) |
| 1945 | 27.9 mm (1.1 in) |
| 1946 | 41.1 mm (1.6 in) |
| 1947 | 48.3 mm (1.9 in) |
| 1948 | 38.6 mm (1.5 in) |
| 1949 | 33.8 mm (1.3 in) |
| 1950 | 33.0 mm (1.3 in) |
| 1951 | 60.7 mm (2.4 in) |
| 1952 | 49.8 mm (2.0 in) |
| 1953 | 56.4 mm (2.2 in) |
| 1954 | 50.3 mm (2.0 in) |
| 1955 | 35.1 mm (1.4 in) |
| 1956 | 31.5 mm (1.2 in) |
| 1957 | 48.5 mm (1.9 in) |
| 1958 | 48.8 mm (1.9 in) |
| 1959 | 46.5 mm (1.8 in) |
| 1960 | 29.0 mm (1.1 in) |
| 1961 | 59.4 mm (2.3 in) |
| 1962 | 32.5 mm (1.3 in) |
| 1963 | 28.4 mm (1.1 in) |
| 1964 | 53.8 mm (2.1 in) |
| 1965 | 40.9 mm (1.6 in) |
| 1966 | 64.8 mm (2.6 in) |
| 1967 | 39.6 mm (1.6 in) |
| 1968 | 38.1 mm (1.5 in) |
| 1969 | 70.6 mm (2.8 in) |
| 1970 | 38.6 mm (1.5 in) |
| 1971 | 34.5 mm (1.4 in) |
| 1972 | 80.0 mm (3.1 in) |
| 1973 | 35.6 mm (1.4 in) |
| 1974 | 45.7 mm (1.8 in) |
| 1975 | 43.4 mm (1.7 in) |
| 1976 | 41.9 mm (1.6 in) |
| 1977 | 33.8 mm (1.3 in) |
| 1978 | 44.7 mm (1.8 in) |
| 1979 | 45.2 mm (1.8 in) |
| 1980 | 48.8 mm (1.9 in) |
| 1981 | 33.0 mm (1.3 in) |
| 1982 | 41.4 mm (1.6 in) |
| 1983 | 53.3 mm (2.1 in) |
| 1984 | 35.3 mm (1.4 in) |
| 1985 | 43.2 mm (1.7 in) |
| 1986 | 63.5 mm (2.5 in) |
| 1987 | 31.8 mm (1.3 in) |
| 1988 | 59.4 mm (2.3 in) |
| 1989 | 39.9 mm (1.6 in) |
| 1990 | 45.5 mm (1.8 in) |
| 1991 | 43.4 mm (1.7 in) |
| 1992 | 45.7 mm (1.8 in) |
| 1993 | 43.2 mm (1.7 in) |
| 1994 | 49.8 mm (2.0 in) |
| 1995 | 38.9 mm (1.5 in) |
| 1996 | 32.5 mm (1.3 in) |
| 1997 | 76.2 mm (3.0 in) |
| 1998 | 42.2 mm (1.7 in) |
| 1999 | 50.3 mm (2.0 in) |
| 2000 | 37.6 mm (1.5 in) |
| 2001 | 27.9 mm (1.1 in) |
| 2002 | 69.1 mm (2.7 in) |
| 2003 | 63.5 mm (2.5 in) |
| 2004 | 40.4 mm (1.6 in) |
| 2005 | 38.9 mm (1.5 in) |
| 2006 | 31.8 mm (1.3 in) |
| 2007 | 83.8 mm (3.3 in) |
| 2008 | 50.8 mm (2.0 in) |
| 2009 | 47.0 mm (1.9 in) |
| 2010 | 56.1 mm (2.2 in) |
| 2011 | 37.3 mm (1.5 in) |
| 2012 | 21.8 mm (0.9 in) |
| 2013 | 50.8 mm (2.0 in) |
| 2014 | 33.0 mm (1.3 in) |
| 2015 | 48.3 mm (1.9 in) |
| 2016 | 57.2 mm (2.3 in) |
| 2017 | 35.6 mm (1.4 in) |
| 2018 | 25.4 mm (1.0 in) |
| 2019 | 36.3 mm (1.4 in) |
| 2020 | 38.6 mm (1.5 in) |
| 2021 | 62.0 mm (2.4 in) |
| 2022 | 38.1 mm (1.5 in) |
| 2023 | 49.3 mm (1.9 in) |
| 2024 | 37.6 mm (1.5 in) |
| 2025 | 71.6 mm (2.8 in) |
| 2026 | 30.5 mm (1.2 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1917 | 35.0 mm (1.4 in) |
| 1942 | 48.8 mm (1.9 in) |
| 1943 | 106.7 mm (4.2 in) |
| 1944 | 52.9 mm (2.1 in) |
| 1945 | 43.9 mm (1.7 in) |
| 1946 | 96.0 mm (3.8 in) |
| 1947 | 93.9 mm (3.7 in) |
| 1948 | 52.4 mm (2.1 in) |
| 1949 | 59.5 mm (2.3 in) |
| 1950 | 53.4 mm (2.1 in) |
| 1951 | 98.8 mm (3.9 in) |
| 1952 | 102.1 mm (4.0 in) |
| 1953 | 87.6 mm (3.4 in) |
| 1954 | 67.6 mm (2.7 in) |
| 1955 | 54.9 mm (2.2 in) |
| 1956 | 79.5 mm (3.1 in) |
| 1957 | 90.5 mm (3.6 in) |
| 1958 | 60.3 mm (2.4 in) |
| 1959 | 92.2 mm (3.6 in) |
| 1960 | 62.7 mm (2.5 in) |
| 1961 | 60.4 mm (2.4 in) |
| 1962 | 85.4 mm (3.4 in) |
| 1963 | 43.5 mm (1.7 in) |
| 1964 | 82.0 mm (3.2 in) |
| 1965 | 73.7 mm (2.9 in) |
| 1966 | 148.1 mm (5.8 in) |
| 1967 | 83.0 mm (3.3 in) |
| 1968 | 85.4 mm (3.4 in) |
| 1969 | 81.2 mm (3.2 in) |
| 1970 | 94.4 mm (3.7 in) |
| 1971 | 58.9 mm (2.3 in) |
| 1972 | 150.6 mm (5.9 in) |
| 1973 | 52.4 mm (2.1 in) |
| 1974 | 86.7 mm (3.4 in) |
| 1975 | 66.5 mm (2.6 in) |
| 1976 | 80.5 mm (3.2 in) |
| 1977 | 50.3 mm (2.0 in) |
| 1978 | 84.8 mm (3.3 in) |
| 1979 | 105.6 mm (4.2 in) |
| 1980 | 80.0 mm (3.1 in) |
| 1981 | 54.4 mm (2.1 in) |
| 1982 | 87.6 mm (3.4 in) |
| 1983 | 82.0 mm (3.2 in) |
| 1984 | 68.7 mm (2.7 in) |
| 1985 | 87.6 mm (3.4 in) |
| 1986 | 99.3 mm (3.9 in) |
| 1987 | 69.9 mm (2.8 in) |
| 1988 | 77.5 mm (3.1 in) |
| 1989 | 61.5 mm (2.4 in) |
| 1990 | 73.8 mm (2.9 in) |
| 1991 | 88.4 mm (3.5 in) |
| 1992 | 74.8 mm (2.9 in) |
| 1993 | 100.1 mm (3.9 in) |
| 1994 | 62.8 mm (2.5 in) |
| 1995 | 71.6 mm (2.8 in) |
| 1996 | 52.1 mm (2.1 in) |
| 1997 | 72.9 mm (2.9 in) |
| 1998 | 76.7 mm (3.0 in) |
| 1999 | 73.2 mm (2.9 in) |
| 2000 | 76.9 mm (3.0 in) |
| 2001 | 50.6 mm (2.0 in) |
| 2002 | 112.8 mm (4.4 in) |
| 2003 | 70.4 mm (2.8 in) |
| 2004 | 66.7 mm (2.6 in) |
| 2005 | 113.0 mm (4.4 in) |
| 2006 | 84.1 mm (3.3 in) |
| 2007 | 104.4 mm (4.1 in) |
| 2008 | 75.1 mm (3.0 in) |
| 2009 | 52.9 mm (2.1 in) |
| 2010 | 96.2 mm (3.8 in) |
| 2011 | 97.8 mm (3.9 in) |
| 2012 | 40.9 mm (1.6 in) |
| 2013 | 118.1 mm (4.6 in) |
| 2014 | 89.9 mm (3.5 in) |
| 2015 | 59.8 mm (2.4 in) |
| 2016 | 87.2 mm (3.4 in) |
| 2017 | 47.8 mm (1.9 in) |
| 2018 | 39.9 mm (1.6 in) |
| 2019 | 71.4 mm (2.8 in) |
| 2020 | 47.1 mm (1.9 in) |
| 2021 | 63.5 mm (2.5 in) |
| 2022 | 61.8 mm (2.4 in) |
| 2023 | 93.7 mm (3.7 in) |
| 2024 | 67.9 mm (2.7 in) |
| 2025 | 196.6 mm (7.7 in) |
| 2026 | 41.5 mm (1.6 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1917 | 55 days |
| 1942 | 30 days |
| 1943 | 22 days |
| 1944 | 22 days |
| 1945 | 27 days |
| 1946 | 19 days |
| 1947 | 19 days |
| 1948 | 29 days |
| 1949 | 27 days |
| 1950 | 43 days |
| 1951 | 30 days |
| 1952 | 40 days |
| 1953 | 22 days |
| 1954 | 20 days |
| 1955 | 38 days |
| 1956 | 32 days |
| 1957 | 27 days |
| 1958 | 24 days |
| 1959 | 35 days |
| 1960 | 23 days |
| 1961 | 38 days |
| 1962 | 28 days |
| 1963 | 28 days |
| 1964 | 27 days |
| 1965 | 21 days |
| 1966 | 47 days |
| 1967 | 57 days |
| 1968 | 26 days |
| 1969 | 22 days |
| 1970 | 27 days |
| 1971 | 48 days |
| 1972 | 39 days |
| 1973 | 38 days |
| 1974 | 47 days |
| 1975 | 23 days |
| 1976 | 31 days |
| 1977 | 29 days |
| 1978 | 25 days |
| 1979 | 30 days |
| 1980 | 50 days |
| 1981 | 22 days |
| 1982 | 21 days |
| 1983 | 24 days |
| 1984 | 26 days |
| 1985 | 18 days |
| 1986 | 16 days |
| 1987 | 16 days |
| 1988 | 103 days |
| 1989 | 52 days |
| 1990 | 21 days |
| 1991 | 55 days |
| 1992 | 20 days |
| 1993 | 28 days |
| 1994 | 25 days |
| 1995 | 31 days |
| 1996 | 24 days |
| 1997 | 18 days |
| 1998 | 26 days |
| 1999 | 41 days |
| 2000 | 31 days |
| 2001 | 38 days |
| 2002 | 68 days |
| 2003 | 31 days |
| 2004 | 57 days |
| 2005 | 38 days |
| 2006 | 22 days |
| 2007 | 36 days |
| 2008 | 27 days |
| 2009 | 21 days |
| 2010 | 19 days |
| 2011 | 40 days |
| 2012 | 43 days |
| 2013 | 45 days |
| 2014 | 35 days |
| 2015 | 34 days |
| 2016 | 21 days |
| 2017 | 32 days |
| 2018 | 21 days |
| 2019 | 26 days |
| 2020 | 44 days |
| 2021 | 23 days |
| 2022 | 25 days |
| 2023 | 29 days |
| 2024 | 32 days |
| 2025 | 40 days |
| 2026 | 35 days |
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
78 years with a frostAcross 78 years with a frost, the median last spring frost at Vallecito Dam falls on 6 June and the median first autumn frost on 21 September, which leaves a median of 110 days between them.
In 1993 to 2025 the median growing season was 118 days. That is 18 days more than in 1943 to 1973.
Fitted over all years, the growing season changes by +3.0 days per decade at this station.
| Measure | Median, all years | Earliest period (1943 to 1973) | Recent period (1993 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 6 June | 10 June | 29 May | 12 days earlier | -1.9 days per decade |
| First autumn frost | 21 September | 18 September | 24 September | 6 days later | +1.1 days per decade |
| Growing days | 110 days | 100 days | 118 days | 18 days more | +3.0 days per decade |
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
75 years, 1943 to 2025A day with at least 43.2 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 85.6 mm (3.4 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 43.2 mm (1.7 in) | |
| 5 years | 54.7 mm (2.2 in) | |
| 10 years | 62.3 mm (2.5 in) | |
| 25 years | 71.8 mm (2.8 in) | |
| 50 years | 78.7 mm (3.1 in) | |
| 100 years | 85.6 mm (3.4 in) | Longer than the 75 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 75 years of values from 1943 to 2025.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 83.8 mm (3.3 in) in 2007; 80.0 mm (3.1 in) in 1972; 71.6 mm (2.8 in) in 2025.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Climate Twins
2010 to 2025 against 1961 to 1990Over 2010 to 2025, Vallecito Dam had a mean temperature of 7.1 C (44.7 F) and 599.5 mm (23.6 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Deer Creek Dam (United States, 479 km away), Idaho City (United States, 999 km away) and Rye (United States, 240 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Deer Creek Dam | United States | 479 km (298 mi) | 6.4 C (43.6 F) | 573.3 mm (22.6 in) | 0.93 |
| Idaho City | United States | 999 km (621 mi) | 7.0 C (44.5 F) | 621.3 mm (24.5 in) | 1.00 |
| Rye | United States | 240 km (149 mi) | 7.6 C (45.7 F) | 566.6 mm (22.3 in) | 1.03 |
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
Download the Data
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-12 (12 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-13).