John Martin Dam Weather Records (USC00054388)
Record envelope, standing records and threshold days for John Martin Dam (USC00054388), Colorado, United States, with 86 years of record.
Key Facts for John Martin Dam
- John Martin Dam (USC00054388) is a weather station in Colorado, United States at 38.06 latitude and -102.93 longitude, 1,162 m (3,811 ft) above sea level.
- The station reports from 1941 to 2026, 86 years of record.
- 1,464 records set at John Martin Dam still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- John Martin Dam set a monthly record daily precipitation of 79.2 mm (3.1 in) on 1 October 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, 38.06 latitude, -102.93 longitude.
- Elevation: 1,162 m (3,811 ft).
- Period of record: 1941 to 2026, 86 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
16 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 26.1 C (79.0 F) | -32.8 C (-27.0 F) | 23.3 C (73.9 F) | -20.6 C (-5.1 F) |
| Feb | 28.3 C (82.9 F) | -32.8 C (-27.0 F) | 26.7 C (80.1 F) | -11.7 C (10.9 F) |
| Mar | 33.3 C (91.9 F) | -30.0 C (-22.0 F) | 33.3 C (91.9 F) | -12.2 C (10.0 F) |
| Apr | 35.0 C (95.0 F) | -11.1 C (12.0 F) | 32.8 C (91.0 F) | -2.2 C (28.0 F) |
| May | 39.4 C (102.9 F) | -6.1 C (21.0 F) | 33.9 C (93.0 F) | -0.6 C (30.9 F) |
| Jun | 43.9 C (111.0 F) | 2.8 C (37.0 F) | 40.0 C (104.0 F) | 11.1 C (52.0 F) |
| Jul | 46.1 C (115.0 F) | 7.2 C (45.0 F) | 42.8 C (109.0 F) | 14.4 C (57.9 F) |
| Aug | 43.9 C (111.0 F) | 1.7 C (35.1 F) | 41.1 C (106.0 F) | 15.0 C (59.0 F) |
| Sep | 41.1 C (106.0 F) | -7.8 C (18.0 F) | 38.9 C (102.0 F) | 10.0 C (50.0 F) |
| Oct | 37.2 C (99.0 F) | -18.3 C (-0.9 F) | 29.4 C (84.9 F) | 6.1 C (43.0 F) |
| Nov | 30.6 C (87.1 F) | -24.4 C (-11.9 F) | n/a | n/a |
| Dec | 26.1 C (79.0 F) | -30.0 C (-22.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1941 | 8 |
| 1942 | 15 |
| 1943 | 10 |
| 1944 | 14 |
| 1945 | 20 |
| 1946 | 19 |
| 1947 | 14 |
| 1948 | 22 |
| 1949 | 17 |
| 1950 | 17 |
| 1951 | 13 |
| 1952 | 29 |
| 1953 | 20 |
| 1954 | 31 |
| 1955 | 17 |
| 1956 | 12 |
| 1957 | 8 |
| 1958 | 12 |
| 1959 | 9 |
| 1960 | 31 |
| 1961 | 15 |
| 1962 | 18 |
| 1963 | 27 |
| 1964 | 16 |
| 1965 | 26 |
| 1966 | 12 |
| 1967 | 19 |
| 1968 | 16 |
| 1969 | 21 |
| 1970 | 21 |
| 1971 | 19 |
| 1972 | 21 |
| 1973 | 11 |
| 1974 | 31 |
| 1975 | 19 |
| 1976 | 13 |
| 1977 | 9 |
| 1978 | 13 |
| 1979 | 18 |
| 1980 | 14 |
| 1981 | 13 |
| 1982 | 12 |
| 1983 | 19 |
| 1984 | 16 |
| 1985 | 18 |
| 1986 | 11 |
| 1987 | 8 |
| 1988 | 11 |
| 1989 | 30 |
| 1990 | 26 |
| 1991 | 9 |
| 1992 | 23 |
| 1993 | 11 |
| 1994 | 10 |
| 1995 | 21 |
| 1996 | 24 |
| 1997 | 20 |
| 1998 | 14 |
| 1999 | 6 |
| 2000 | 13 |
| 2001 | 11 |
| 2002 | 19 |
| 2003 | 15 |
| 2004 | 18 |
| 2005 | 15 |
| 2006 | 13 |
| 2007 | 20 |
| 2008 | 17 |
| 2009 | 18 |
| 2010 | 9 |
| 2011 | 14 |
| 2012 | 25 |
| 2013 | 30 |
| 2014 | 27 |
| 2015 | 14 |
| 2016 | 22 |
| 2017 | 17 |
| 2018 | 11 |
| 2019 | 18 |
| 2020 | 23 |
| 2021 | 17 |
| 2022 | 20 |
| 2023 | 11 |
| 2024 | 8 |
| 2025 | 21 |
| 2026 | 19 |
All-Time Record Progression
5 new records| Date | Kind | Detail |
|---|---|---|
| 1984-03-19 | Record daily snowfall | Record daily snowfall 30.5 cm (12.0 in) |
| 1990-07-11 | Record daily precipitation | Record daily precipitation 104.9 mm (4.1 in) |
| 1990-12-22 | Record low maximum temperature | Record low maximum temperature -21.7 C (-7.1 F) |
| 1998-07-14 | Record high maximum temperature | Record high maximum temperature 43.9 C (111.0 F) |
| 2019-07-20 | Record high maximum temperature | Record high maximum temperature 46.1 C (115.0 F) |
Wettest Day of Each Month
Jul: 104.9 mm (4.1 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 31.0 mm (1.2 in) | 2 January 2007 |
| Feb | 32.0 mm (1.3 in) | 18 February 1971 |
| Mar | 48.3 mm (1.9 in) | 27 March 2009 |
| Apr | 46.7 mm (1.8 in) | 30 April 1978 |
| May | 95.3 mm (3.8 in) | 29 May 1964 |
| Jun | 73.7 mm (2.9 in) | 29 June 1995 |
| Jul | 104.9 mm (4.1 in) | 11 July 1990 |
| Aug | 72.6 mm (2.9 in) | 2 August 1999 |
| Sep | 81.3 mm (3.2 in) | 15 September 1988 |
| Oct | 66.8 mm (2.6 in) | 27 October 2006 |
| Nov | 42.9 mm (1.7 in) | 2 November 1998 |
| Dec | 50.8 mm (2.0 in) | 24 December 1982 |
Period of Record Coverage
1941 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1941 | 145 | 40% | No |
| 1942 | 355 | 97% | Yes |
| 1943 | 352 | 96% | Yes |
| 1944 | 355 | 97% | Yes |
| 1945 | 349 | 96% | Yes |
| 1946 | 346 | 95% | Yes |
| 1947 | 341 | 93% | Yes |
| 1948 | 346 | 95% | Yes |
| 1949 | 361 | 99% | Yes |
| 1950 | 357 | 98% | Yes |
| 1951 | 354 | 97% | Yes |
| 1952 | 365 | 100% | Yes |
| 1953 | 359 | 98% | Yes |
| 1954 | 361 | 99% | Yes |
| 1955 | 362 | 99% | Yes |
| 1956 | 363 | 99% | Yes |
| 1957 | 364 | 100% | Yes |
| 1958 | 363 | 99% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 364 | 99% | Yes |
| 1961 | 363 | 99% | Yes |
| 1962 | 361 | 99% | Yes |
| 1963 | 364 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 364 | 100% | Yes |
| 1966 | 363 | 99% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 365 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 364 | 100% | Yes |
| 1971 | 364 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 265 | 73% | No |
| 1974 | 351 | 96% | Yes |
| 1975 | 332 | 91% | Yes |
| 1976 | 356 | 97% | Yes |
| 1977 | 324 | 89% | No |
| 1978 | 289 | 79% | No |
| 1979 | 306 | 84% | No |
| 1980 | 291 | 80% | No |
| 1981 | 297 | 81% | No |
| 1982 | 197 | 54% | No |
| 1983 | 221 | 61% | No |
| 1984 | 287 | 78% | No |
| 1985 | 263 | 72% | No |
| 1986 | 250 | 68% | No |
| 1987 | 239 | 65% | No |
| 1988 | 244 | 67% | No |
| 1989 | 331 | 91% | Yes |
| 1990 | 358 | 98% | Yes |
| 1991 | 304 | 83% | No |
| 1992 | 278 | 76% | No |
| 1993 | 272 | 75% | No |
| 1994 | 257 | 70% | No |
| 1995 | 252 | 69% | No |
| 1996 | 261 | 71% | No |
| 1997 | 351 | 96% | Yes |
| 1998 | 351 | 96% | Yes |
| 1999 | 363 | 99% | Yes |
| 2000 | 350 | 96% | Yes |
| 2001 | 351 | 96% | Yes |
| 2002 | 352 | 96% | Yes |
| 2003 | 342 | 94% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 355 | 97% | Yes |
| 2006 | 353 | 97% | Yes |
| 2007 | 355 | 97% | Yes |
| 2008 | 363 | 99% | Yes |
| 2009 | 363 | 99% | Yes |
| 2010 | 364 | 100% | Yes |
| 2011 | 363 | 99% | Yes |
| 2012 | 361 | 99% | Yes |
| 2013 | 362 | 99% | Yes |
| 2014 | 354 | 97% | Yes |
| 2015 | 361 | 99% | Yes |
| 2016 | 349 | 95% | Yes |
| 2017 | 334 | 92% | Yes |
| 2018 | 353 | 97% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 365 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 277 | 76% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 1 October 2026 | John Martin Dam, US | monthly rain (Provisional) | 79.2 mm (3.1 in) | 12.4 mm (0.5 in) | 19 years | 37 of 100 (Notable) |
| 25 September 2026 | John Martin Dam, US | daily high min (Provisional) | 15.0 C (59.0 F) | 1.1 C (2.0 F) | 59 years | 27 of 100 (Routine) |
| 24 September 2026 | John Martin Dam, US | daily rain (Provisional) | 32.3 mm (1.3 in) | 6.1 mm (0.24 in) | 11 years | 17 of 100 (Routine) |
| 24 September 2026 | John Martin Dam, US | daily high min (Tie, Provisional) | 16.7 C (62.1 F) | tie | 68 years | 7 of 100 (Routine) |
| 15 September 2026 | John Martin Dam, US | daily high min (Tie, Provisional) | 17.8 C (64.0 F) | tie | 71 years | 7 of 100 (Routine) |
| 7 September 2026 | John Martin Dam, US | daily high min (Provisional) | 20.6 C (69.1 F) | 0.6 C (1.1 F) | 24 years | 16 of 100 (Routine) |
| 22 August 2026 | John Martin Dam, US | daily high max (Provisional) | 39.4 C (102.9 F) | 0.5 C (0.9 F) | 31 years | 18 of 100 (Routine) |
| 12 August 2026 | John Martin Dam, US | daily high min | 22.2 C (72.0 F) | 0.5 C (0.9 F) | 75 years | 31 of 100 (Routine) |
| 10 August 2026 | John Martin Dam, US | daily high max | 41.1 C (106.0 F) | 1.1 C (2.0 F) | 32 years | 19 of 100 (Routine) |
| 29 July 2026 | John Martin Dam, US | daily rain | 56.6 mm (2.2 in) | 15.5 mm (0.6 in) | 28 years | 29 of 100 (Routine) |
| 28 July 2026 | John Martin Dam, US | daily high max | 41.1 C (106.0 F) | 0.5 C (0.9 F) | 48 years | 23 of 100 (Routine) |
| 27 July 2026 | John Martin Dam, US | daily high max | 42.8 C (109.0 F) | 1.1 C (2.0 F) | 15 years | 14 of 100 (Routine) |
| 25 July 2026 | John Martin Dam, US | daily high min (Tie) | 22.2 C (72.0 F) | tie | 23 years | 3 of 100 (Routine) |
| 7 May 2026 | John Martin Dam, US | daily low min | -0.6 C (30.9 F) | 1.7 C (3.1 F) | 48 years | 26 of 100 (Routine) |
| 7 May 2026 | John Martin Dam, US | daily low max | 6.1 C (43.0 F) | 2.8 C (5.0 F) | 0 years | 12 of 100 (Routine) |
| 6 May 2026 | John Martin Dam, US | daily snowfall | 1.8 cm (0.7 in) | 1.8 cm (0.7 in) | 84 years | 20 of 100 (Routine) |
| 6 May 2026 | John Martin Dam, US | daily low min (Tie) | -0.6 C (30.9 F) | tie | 36 years | 4 of 100 (Routine) |
| 30 March 2026 | John Martin Dam, US | daily high max (Tie) | 30.6 C (87.1 F) | tie | 80 years | 8 of 100 (Routine) |
| 27 March 2026 | John Martin Dam, US | monthly high max (Tie) | 33.3 C (91.9 F) | tie | 0 years | 4 of 100 (Routine) |
| 26 March 2026 | John Martin Dam, US | monthly high max (Tie) | 33.3 C (91.9 F) | tie | 0 years | 4 of 100 (Routine) |
Climate Trend
62 complete years, 1942 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1942 | 11.1 C | -1.29 C |
| 1943 | 12.0 C | -0.42 C |
| 1944 | 11.3 C | -1.07 C |
| 1945 | 11.7 C | -0.73 C |
| 1946 | 12.7 C | +0.30 C |
| 1947 | 12.0 C | -0.35 C |
| 1948 | 11.7 C | -0.67 C |
| 1949 | 12.1 C | -0.25 C |
| 1950 | 12.4 C | +0.01 C |
| 1951 | 11.6 C | -0.81 C |
| 1952 | 12.8 C | +0.43 C |
| 1953 | 13.4 C | +1.04 C |
| 1954 | 13.7 C | +1.34 C |
| 1955 | 12.3 C | -0.06 C |
| 1956 | 12.6 C | +0.26 C |
| 1957 | 12.5 C | +0.08 C |
| 1958 | 12.7 C | +0.33 C |
| 1959 | 12.4 C | -0.02 C |
| 1960 | 11.3 C | -1.07 C |
| 1961 | 11.8 C | -0.55 C |
| 1962 | 12.7 C | +0.36 C |
| 1963 | 13.7 C | +1.27 C |
| 1964 | 12.7 C | +0.28 C |
| 1965 | 12.6 C | +0.24 C |
| 1966 | 12.2 C | -0.19 C |
| 1967 | 13.3 C | +0.94 C |
| 1968 | 11.7 C | -0.70 C |
| 1969 | 11.8 C | -0.54 C |
| 1970 | 11.5 C | -0.91 C |
| 1971 | 11.5 C | -0.90 C |
| 1972 | 11.3 C | -1.13 C |
| 1974 | 12.8 C | +0.41 C |
| 1976 | 12.9 C | +0.54 C |
| 1990 | 11.0 C | -1.34 C |
| 1997 | 11.8 C | -0.55 C |
| 1998 | 12.5 C | +0.15 C |
| 1999 | 12.5 C | +0.16 C |
| 2000 | 12.7 C | +0.31 C |
| 2001 | 12.0 C | -0.40 C |
| 2002 | 12.4 C | +0.01 C |
| 2003 | 13.1 C | +0.69 C |
| 2004 | 12.7 C | +0.30 C |
| 2005 | 13.1 C | +0.69 C |
| 2006 | 13.0 C | +0.65 C |
| 2007 | 11.3 C | -1.06 C |
| 2008 | 12.2 C | -0.15 C |
| 2009 | 11.8 C | -0.59 C |
| 2010 | 12.8 C | +0.37 C |
| 2011 | 12.1 C | -0.25 C |
| 2012 | 13.9 C | +1.56 C |
| 2013 | 12.3 C | -0.09 C |
| 2014 | 12.3 C | -0.12 C |
| 2015 | 13.3 C | +0.91 C |
| 2016 | 13.4 C | +1.06 C |
| 2018 | 13.0 C | +0.58 C |
| 2019 | 12.1 C | -0.30 C |
| 2020 | 13.0 C | +0.57 C |
| 2021 | 12.6 C | +0.19 C |
| 2022 | 11.9 C | -0.49 C |
| 2023 | 12.1 C | -0.33 C |
| 2024 | 13.2 C | +0.83 C |
| 2025 | 12.8 C | +0.40 C |
The fitted trend in annual mean temperature here over 1942 to 2025 is 0.06 C (0.00 to 0.12) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.11 F (0.00 to 0.22) per decade. The slope is a straight line fitted to 62 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.06 C (0.00 to 0.12) per decade | 0.11 F (0.00 to 0.22) per decade | 1942 to 2025 | 62 | Not clearly different from zero |
| Mean daily maximum | 0.10 C (0.02 to 0.19) per decade | 0.18 F (0.03 to 0.34) per decade | 1942 to 2025 | 62 | Rise |
| Mean daily minimum | 0.02 C (-0.04 to 0.08) per decade | 0.03 F (-0.08 to 0.14) per decade | 1942 to 2025 | 62 | Not clearly different from zero |
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
1941 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 46.1 C (115.0 F) | 2019 | 40.6 C (105.1 F) | 86 |
| Coldest night (TNn) | -32.8 C (-27.0 F) | 1949 | -23.3 C (-9.9 F) | 86 |
| Wettest day (Rx1day) | 104.9 mm (4.1 in) | 1990 | 41.3 mm (1.6 in) | 86 |
| Wettest five days (Rx5day) | 135.1 mm (5.3 in) | 1964 | 53.4 mm (2.1 in) | 86 |
| Longest dry spell (CDD) | 121 days | 2022 | 48 days | 86 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1941 | 36.7 C (98.1 F) |
| 1942 | 38.9 C (102.0 F) |
| 1943 | 40.6 C (105.1 F) |
| 1944 | 38.9 C (102.0 F) |
| 1945 | 39.4 C (102.9 F) |
| 1946 | 40.6 C (105.1 F) |
| 1947 | 40.0 C (104.0 F) |
| 1948 | 38.9 C (102.0 F) |
| 1949 | 38.3 C (100.9 F) |
| 1950 | 38.3 C (100.9 F) |
| 1951 | 40.6 C (105.1 F) |
| 1952 | 41.7 C (107.1 F) |
| 1953 | 43.3 C (109.9 F) |
| 1954 | 41.7 C (107.1 F) |
| 1955 | 39.4 C (102.9 F) |
| 1956 | 38.3 C (100.9 F) |
| 1957 | 40.0 C (104.0 F) |
| 1958 | 38.3 C (100.9 F) |
| 1959 | 38.9 C (102.0 F) |
| 1960 | 40.0 C (104.0 F) |
| 1961 | 38.3 C (100.9 F) |
| 1962 | 39.4 C (102.9 F) |
| 1963 | 41.1 C (106.0 F) |
| 1964 | 40.6 C (105.1 F) |
| 1965 | 38.3 C (100.9 F) |
| 1966 | 40.6 C (105.1 F) |
| 1967 | 38.9 C (102.0 F) |
| 1968 | 40.0 C (104.0 F) |
| 1969 | 41.7 C (107.1 F) |
| 1970 | 41.1 C (106.0 F) |
| 1971 | 40.0 C (104.0 F) |
| 1972 | 39.4 C (102.9 F) |
| 1973 | 36.1 C (97.0 F) |
| 1974 | 41.1 C (106.0 F) |
| 1975 | 40.6 C (105.1 F) |
| 1976 | 38.9 C (102.0 F) |
| 1977 | 40.6 C (105.1 F) |
| 1978 | 40.6 C (105.1 F) |
| 1979 | 41.1 C (106.0 F) |
| 1980 | 41.7 C (107.1 F) |
| 1981 | 41.7 C (107.1 F) |
| 1982 | 38.9 C (102.0 F) |
| 1983 | 40.0 C (104.0 F) |
| 1984 | 40.0 C (104.0 F) |
| 1985 | 41.1 C (106.0 F) |
| 1986 | 40.0 C (104.0 F) |
| 1987 | 40.0 C (104.0 F) |
| 1988 | 41.1 C (106.0 F) |
| 1989 | 40.6 C (105.1 F) |
| 1990 | 41.1 C (106.0 F) |
| 1991 | 41.7 C (107.1 F) |
| 1992 | 40.0 C (104.0 F) |
| 1993 | 41.1 C (106.0 F) |
| 1994 | 40.6 C (105.1 F) |
| 1995 | 40.6 C (105.1 F) |
| 1996 | 40.0 C (104.0 F) |
| 1997 | 40.6 C (105.1 F) |
| 1998 | 43.9 C (111.0 F) |
| 1999 | 40.0 C (104.0 F) |
| 2000 | 41.1 C (106.0 F) |
| 2001 | 43.3 C (109.9 F) |
| 2002 | 43.3 C (109.9 F) |
| 2003 | 42.2 C (108.0 F) |
| 2004 | 39.4 C (102.9 F) |
| 2005 | 42.8 C (109.0 F) |
| 2006 | 40.6 C (105.1 F) |
| 2007 | 40.6 C (105.1 F) |
| 2008 | 43.9 C (111.0 F) |
| 2009 | 41.1 C (106.0 F) |
| 2010 | 42.2 C (108.0 F) |
| 2011 | 41.7 C (107.1 F) |
| 2012 | 43.9 C (111.0 F) |
| 2013 | 43.9 C (111.0 F) |
| 2014 | 41.1 C (106.0 F) |
| 2015 | 40.0 C (104.0 F) |
| 2016 | 41.1 C (106.0 F) |
| 2017 | 40.6 C (105.1 F) |
| 2018 | 42.2 C (108.0 F) |
| 2019 | 46.1 C (115.0 F) |
| 2020 | 40.6 C (105.1 F) |
| 2021 | 39.4 C (102.9 F) |
| 2022 | 42.2 C (108.0 F) |
| 2023 | 40.6 C (105.1 F) |
| 2024 | 40.6 C (105.1 F) |
| 2025 | 41.1 C (106.0 F) |
| 2026 | 42.8 C (109.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1941 | -16.7 C (1.9 F) |
| 1942 | -29.4 C (-20.9 F) |
| 1943 | -27.2 C (-17.0 F) |
| 1944 | -22.2 C (-8.0 F) |
| 1945 | -21.1 C (-6.0 F) |
| 1946 | -18.9 C (-2.0 F) |
| 1947 | -20.6 C (-5.1 F) |
| 1948 | -30.0 C (-22.0 F) |
| 1949 | -32.8 C (-27.0 F) |
| 1950 | -26.1 C (-15.0 F) |
| 1951 | -25.6 C (-14.1 F) |
| 1952 | -21.7 C (-7.1 F) |
| 1953 | -20.0 C (-4.0 F) |
| 1954 | -18.9 C (-2.0 F) |
| 1955 | -20.0 C (-4.0 F) |
| 1956 | -23.9 C (-11.0 F) |
| 1957 | -23.3 C (-9.9 F) |
| 1958 | -16.7 C (1.9 F) |
| 1959 | -27.8 C (-18.0 F) |
| 1960 | -29.4 C (-20.9 F) |
| 1961 | -28.9 C (-20.0 F) |
| 1962 | -29.4 C (-20.9 F) |
| 1963 | -28.9 C (-20.0 F) |
| 1964 | -20.0 C (-4.0 F) |
| 1965 | -21.7 C (-7.1 F) |
| 1966 | -26.1 C (-15.0 F) |
| 1967 | -18.9 C (-2.0 F) |
| 1968 | -22.2 C (-8.0 F) |
| 1969 | -18.9 C (-2.0 F) |
| 1970 | -20.0 C (-4.0 F) |
| 1971 | -28.3 C (-18.9 F) |
| 1972 | -26.7 C (-16.1 F) |
| 1973 | -21.7 C (-7.1 F) |
| 1974 | -27.8 C (-18.0 F) |
| 1975 | -20.6 C (-5.1 F) |
| 1976 | -24.4 C (-11.9 F) |
| 1977 | -23.9 C (-11.0 F) |
| 1978 | -27.2 C (-17.0 F) |
| 1979 | -26.1 C (-15.0 F) |
| 1980 | -18.9 C (-2.0 F) |
| 1981 | -26.7 C (-16.1 F) |
| 1982 | -27.8 C (-18.0 F) |
| 1983 | -30.0 C (-22.0 F) |
| 1984 | -32.8 C (-27.0 F) |
| 1985 | -25.0 C (-13.0 F) |
| 1986 | -21.7 C (-7.1 F) |
| 1987 | -18.3 C (-0.9 F) |
| 1988 | -25.6 C (-14.1 F) |
| 1989 | -27.8 C (-18.0 F) |
| 1990 | -28.9 C (-20.0 F) |
| 1991 | -23.3 C (-9.9 F) |
| 1992 | -18.9 C (-2.0 F) |
| 1993 | -23.3 C (-9.9 F) |
| 1994 | -19.4 C (-2.9 F) |
| 1995 | -17.2 C (1.0 F) |
| 1996 | -30.0 C (-22.0 F) |
| 1997 | -20.6 C (-5.1 F) |
| 1998 | -25.0 C (-13.0 F) |
| 1999 | -15.0 C (5.0 F) |
| 2000 | -18.3 C (-0.9 F) |
| 2001 | -20.6 C (-5.1 F) |
| 2002 | -18.9 C (-2.0 F) |
| 2003 | -18.3 C (-0.9 F) |
| 2004 | -23.9 C (-11.0 F) |
| 2005 | -24.4 C (-11.9 F) |
| 2006 | -20.6 C (-5.1 F) |
| 2007 | -24.4 C (-11.9 F) |
| 2008 | -20.0 C (-4.0 F) |
| 2009 | -24.4 C (-11.9 F) |
| 2010 | -20.0 C (-4.0 F) |
| 2011 | -27.8 C (-18.0 F) |
| 2012 | -21.7 C (-7.1 F) |
| 2013 | -20.6 C (-5.1 F) |
| 2014 | -23.9 C (-11.0 F) |
| 2015 | -19.4 C (-2.9 F) |
| 2016 | -25.0 C (-13.0 F) |
| 2017 | -21.7 C (-7.1 F) |
| 2018 | -20.6 C (-5.1 F) |
| 2019 | -18.3 C (-0.9 F) |
| 2020 | -18.9 C (-2.0 F) |
| 2021 | -32.8 C (-27.0 F) |
| 2022 | -23.9 C (-11.0 F) |
| 2023 | -20.0 C (-4.0 F) |
| 2024 | -26.1 C (-15.0 F) |
| 2025 | -26.1 C (-15.0 F) |
| 2026 | -20.6 C (-5.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1941 | 77.2 mm (3.0 in) |
| 1942 | 49.5 mm (1.9 in) |
| 1943 | 71.4 mm (2.8 in) |
| 1944 | 40.6 mm (1.6 in) |
| 1945 | 25.4 mm (1.0 in) |
| 1946 | 56.9 mm (2.2 in) |
| 1947 | 24.9 mm (1.0 in) |
| 1948 | 36.3 mm (1.4 in) |
| 1949 | 48.3 mm (1.9 in) |
| 1950 | 30.7 mm (1.2 in) |
| 1951 | 29.2 mm (1.1 in) |
| 1952 | 22.9 mm (0.9 in) |
| 1953 | 36.8 mm (1.4 in) |
| 1954 | 58.4 mm (2.3 in) |
| 1955 | 53.6 mm (2.1 in) |
| 1956 | 37.1 mm (1.5 in) |
| 1957 | 33.8 mm (1.3 in) |
| 1958 | 31.8 mm (1.3 in) |
| 1959 | 18.3 mm (0.7 in) |
| 1960 | 47.5 mm (1.9 in) |
| 1961 | 84.6 mm (3.3 in) |
| 1962 | 41.9 mm (1.6 in) |
| 1963 | 22.6 mm (0.9 in) |
| 1964 | 95.3 mm (3.8 in) |
| 1965 | 61.7 mm (2.4 in) |
| 1966 | 37.3 mm (1.5 in) |
| 1967 | 36.6 mm (1.4 in) |
| 1968 | 37.8 mm (1.5 in) |
| 1969 | 30.2 mm (1.2 in) |
| 1970 | 26.9 mm (1.1 in) |
| 1971 | 47.0 mm (1.9 in) |
| 1972 | 34.5 mm (1.4 in) |
| 1973 | 18.5 mm (0.7 in) |
| 1974 | 34.3 mm (1.4 in) |
| 1975 | 37.1 mm (1.5 in) |
| 1976 | 23.9 mm (0.9 in) |
| 1977 | 50.3 mm (2.0 in) |
| 1978 | 47.0 mm (1.9 in) |
| 1979 | 29.7 mm (1.2 in) |
| 1980 | 43.9 mm (1.7 in) |
| 1981 | 32.8 mm (1.3 in) |
| 1982 | 50.8 mm (2.0 in) |
| 1983 | 24.9 mm (1.0 in) |
| 1984 | 38.1 mm (1.5 in) |
| 1985 | 27.9 mm (1.1 in) |
| 1986 | 25.4 mm (1.0 in) |
| 1987 | 33.0 mm (1.3 in) |
| 1988 | 81.3 mm (3.2 in) |
| 1989 | 45.5 mm (1.8 in) |
| 1990 | 104.9 mm (4.1 in) |
| 1991 | 37.3 mm (1.5 in) |
| 1992 | 40.9 mm (1.6 in) |
| 1993 | 17.3 mm (0.7 in) |
| 1994 | 23.1 mm (0.9 in) |
| 1995 | 73.7 mm (2.9 in) |
| 1996 | 28.7 mm (1.1 in) |
| 1997 | 48.0 mm (1.9 in) |
| 1998 | 67.8 mm (2.7 in) |
| 1999 | 72.6 mm (2.9 in) |
| 2000 | 21.6 mm (0.9 in) |
| 2001 | 54.6 mm (2.1 in) |
| 2002 | 49.5 mm (1.9 in) |
| 2003 | 23.6 mm (0.9 in) |
| 2004 | 43.2 mm (1.7 in) |
| 2005 | 16.5 mm (0.6 in) |
| 2006 | 66.8 mm (2.6 in) |
| 2007 | 41.7 mm (1.6 in) |
| 2008 | 48.0 mm (1.9 in) |
| 2009 | 48.3 mm (1.9 in) |
| 2010 | 50.0 mm (2.0 in) |
| 2011 | 51.8 mm (2.0 in) |
| 2012 | 41.7 mm (1.6 in) |
| 2013 | 43.2 mm (1.7 in) |
| 2014 | 41.7 mm (1.6 in) |
| 2015 | 40.4 mm (1.6 in) |
| 2016 | 43.9 mm (1.7 in) |
| 2017 | 42.7 mm (1.7 in) |
| 2018 | 53.8 mm (2.1 in) |
| 2019 | 42.9 mm (1.7 in) |
| 2020 | 29.2 mm (1.1 in) |
| 2021 | 35.8 mm (1.4 in) |
| 2022 | 54.4 mm (2.1 in) |
| 2023 | 58.7 mm (2.3 in) |
| 2024 | 24.9 mm (1.0 in) |
| 2025 | 37.3 mm (1.5 in) |
| 2026 | 79.2 mm (3.1 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1941 | 88.4 mm (3.5 in) |
| 1942 | 85.1 mm (3.4 in) |
| 1943 | 72.9 mm (2.9 in) |
| 1944 | 105.1 mm (4.1 in) |
| 1945 | 42.2 mm (1.7 in) |
| 1946 | 80.8 mm (3.2 in) |
| 1947 | 53.3 mm (2.1 in) |
| 1948 | 55.7 mm (2.2 in) |
| 1949 | 82.5 mm (3.2 in) |
| 1950 | 38.6 mm (1.5 in) |
| 1951 | 53.4 mm (2.1 in) |
| 1952 | 22.9 mm (0.9 in) |
| 1953 | 36.8 mm (1.4 in) |
| 1954 | 92.5 mm (3.6 in) |
| 1955 | 63.8 mm (2.5 in) |
| 1956 | 69.4 mm (2.7 in) |
| 1957 | 34.8 mm (1.4 in) |
| 1958 | 36.6 mm (1.4 in) |
| 1959 | 34.7 mm (1.4 in) |
| 1960 | 52.8 mm (2.1 in) |
| 1961 | 104.7 mm (4.1 in) |
| 1962 | 57.4 mm (2.3 in) |
| 1963 | 42.9 mm (1.7 in) |
| 1964 | 135.1 mm (5.3 in) |
| 1965 | 80.0 mm (3.1 in) |
| 1966 | 47.7 mm (1.9 in) |
| 1967 | 45.5 mm (1.8 in) |
| 1968 | 51.0 mm (2.0 in) |
| 1969 | 38.9 mm (1.5 in) |
| 1970 | 34.3 mm (1.4 in) |
| 1971 | 78.2 mm (3.1 in) |
| 1972 | 41.3 mm (1.6 in) |
| 1973 | 47.5 mm (1.9 in) |
| 1974 | 39.1 mm (1.5 in) |
| 1975 | 50.5 mm (2.0 in) |
| 1976 | 30.0 mm (1.2 in) |
| 1977 | 77.7 mm (3.1 in) |
| 1978 | 86.6 mm (3.4 in) |
| 1979 | 36.1 mm (1.4 in) |
| 1980 | 68.3 mm (2.7 in) |
| 1981 | 38.4 mm (1.5 in) |
| 1982 | 50.8 mm (2.0 in) |
| 1983 | 44.1 mm (1.7 in) |
| 1984 | 40.6 mm (1.6 in) |
| 1985 | 27.9 mm (1.1 in) |
| 1986 | 39.1 mm (1.5 in) |
| 1987 | 55.1 mm (2.2 in) |
| 1988 | 94.0 mm (3.7 in) |
| 1989 | 51.1 mm (2.0 in) |
| 1990 | 131.0 mm (5.2 in) |
| 1991 | 41.1 mm (1.6 in) |
| 1992 | 32.0 mm (1.3 in) |
| 1993 | 31.0 mm (1.2 in) |
| 1994 | 44.7 mm (1.8 in) |
| 1995 | 77.5 mm (3.1 in) |
| 1996 | 35.8 mm (1.4 in) |
| 1997 | 83.6 mm (3.3 in) |
| 1998 | 119.6 mm (4.7 in) |
| 1999 | 91.9 mm (3.6 in) |
| 2000 | 21.6 mm (0.9 in) |
| 2001 | 71.5 mm (2.8 in) |
| 2002 | 74.2 mm (2.9 in) |
| 2003 | 29.2 mm (1.1 in) |
| 2004 | 74.5 mm (2.9 in) |
| 2005 | 31.4 mm (1.2 in) |
| 2006 | 78.0 mm (3.1 in) |
| 2007 | 67.6 mm (2.7 in) |
| 2008 | 56.4 mm (2.2 in) |
| 2009 | 76.2 mm (3.0 in) |
| 2010 | 59.3 mm (2.3 in) |
| 2011 | 51.8 mm (2.0 in) |
| 2012 | 41.7 mm (1.6 in) |
| 2013 | 76.8 mm (3.0 in) |
| 2014 | 42.0 mm (1.7 in) |
| 2015 | 67.3 mm (2.6 in) |
| 2016 | 70.4 mm (2.8 in) |
| 2017 | 69.5 mm (2.7 in) |
| 2018 | 82.3 mm (3.2 in) |
| 2019 | 62.0 mm (2.4 in) |
| 2020 | 43.1 mm (1.7 in) |
| 2021 | 38.4 mm (1.5 in) |
| 2022 | 75.2 mm (3.0 in) |
| 2023 | 61.0 mm (2.4 in) |
| 2024 | 31.5 mm (1.2 in) |
| 2025 | 44.1 mm (1.7 in) |
| 2026 | 91.4 mm (3.6 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1941 | 29 days |
| 1942 | 43 days |
| 1943 | 52 days |
| 1944 | 46 days |
| 1945 | 35 days |
| 1946 | 38 days |
| 1947 | 26 days |
| 1948 | 34 days |
| 1949 | 62 days |
| 1950 | 33 days |
| 1951 | 57 days |
| 1952 | 48 days |
| 1953 | 60 days |
| 1954 | 73 days |
| 1955 | 98 days |
| 1956 | 74 days |
| 1957 | 45 days |
| 1958 | 41 days |
| 1959 | 37 days |
| 1960 | 56 days |
| 1961 | 34 days |
| 1962 | 79 days |
| 1963 | 65 days |
| 1964 | 50 days |
| 1965 | 53 days |
| 1966 | 70 days |
| 1967 | 46 days |
| 1968 | 61 days |
| 1969 | 43 days |
| 1970 | 74 days |
| 1971 | 57 days |
| 1972 | 74 days |
| 1973 | 71 days |
| 1974 | 67 days |
| 1975 | 48 days |
| 1976 | 34 days |
| 1977 | 100 days |
| 1978 | 25 days |
| 1979 | 41 days |
| 1980 | 75 days |
| 1981 | 47 days |
| 1982 | 18 days |
| 1983 | 56 days |
| 1984 | 26 days |
| 1985 | 33 days |
| 1986 | 52 days |
| 1987 | 46 days |
| 1988 | 75 days |
| 1989 | 51 days |
| 1990 | 39 days |
| 1991 | 39 days |
| 1992 | 35 days |
| 1993 | 46 days |
| 1994 | 40 days |
| 1995 | 85 days |
| 1996 | 64 days |
| 1997 | 42 days |
| 1998 | 47 days |
| 1999 | 66 days |
| 2000 | 39 days |
| 2001 | 86 days |
| 2002 | 70 days |
| 2003 | 38 days |
| 2004 | 32 days |
| 2005 | 44 days |
| 2006 | 47 days |
| 2007 | 66 days |
| 2008 | 65 days |
| 2009 | 45 days |
| 2010 | 48 days |
| 2011 | 34 days |
| 2012 | 49 days |
| 2013 | 82 days |
| 2014 | 44 days |
| 2015 | 36 days |
| 2016 | 70 days |
| 2017 | 87 days |
| 2018 | 52 days |
| 2019 | 44 days |
| 2020 | 49 days |
| 2021 | 42 days |
| 2022 | 121 days |
| 2023 | 47 days |
| 2024 | 49 days |
| 2025 | 21 days |
| 2026 | 32 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
62 years with a frostAcross 62 years with a frost, the median last spring frost at John Martin Dam falls on 29 April and the median first autumn frost on 13 October, which leaves a median of 168 days between them.
In 1976 to 2025 the median growing season was 172 days. That is 10 days more than in 1942 to 1971.
Fitted over all years, the growing season changes by +1.9 days per decade at this station.
| Measure | Median, all years | Earliest period (1942 to 1971) | Recent period (1976 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 29 April | 1 May | 22 April | 9 days earlier | -1.0 days per decade |
| First autumn frost | 13 October | 7 October | 14 October | 7 days later | +0.8 days per decade |
| Growing days | 168 days | 162 days | 172 days | 10 days more | +1.9 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
65 years, 1942 to 2023A day with at least 41.6 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 98.3 mm (3.9 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 41.6 mm (1.6 in) | |
| 5 years | 56.2 mm (2.2 in) | |
| 10 years | 66.1 mm (2.6 in) | |
| 25 years | 78.9 mm (3.1 in) | |
| 50 years | 88.6 mm (3.5 in) | |
| 100 years | 98.3 mm (3.9 in) | Longer than the 65 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, 65 years of values from 1942 to 2023.
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: 104.9 mm (4.1 in) in 1990; 95.3 mm (3.8 in) in 1964; 84.6 mm (3.3 in) in 1961.
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, John Martin Dam had a mean temperature of 12.7 C (54.9 F) and 293.3 mm (11.5 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Teec Nos Pos (United States, 558 km away), Johnson 11 ESE (United States, 133 km away) and Ulysses 3NE (United States, 153 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Teec Nos Pos | United States | 558 km (347 mi) | 12.7 C (54.9 F) | 210.6 mm (8.3 in) | 0.84 |
| Johnson 11 ESE | United States | 133 km (83 mi) | 12.8 C (55.0 F) | 358.5 mm (14.1 in) | 0.87 |
| Ulysses 3NE | United States | 153 km (95 mi) | 12.8 C (55.1 F) | 430.9 mm (17.0 in) | 0.92 |
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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-14).