Delta Weather Records (USW00023162)
Record envelope, standing records and threshold days for Delta (USW00023162), Utah, United States, with 89 years of record.
Key Facts for Delta
- Delta (USW00023162) is a weather station in Utah, United States at 39.34 latitude and -112.59 longitude, 1,408 m (4,620 ft) above sea level.
- The station reports from 1938 to 2026, 89 years of record.
- 1,464 records set at Delta still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Delta set a daily record high minimum temperature of 17.0 C (62.6 F) on 18 September 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Utah, United States, 39.34 latitude, -112.59 longitude.
- Elevation: 1,408 m (4,620 ft).
- Period of record: 1938 to 2026, 89 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
33 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 17.8 C (64.0 F) | -31.7 C (-25.1 F) | 15.0 C (59.0 F) | -16.7 C (1.9 F) |
| Feb | 23.3 C (73.9 F) | -32.8 C (-27.0 F) | 20.6 C (69.1 F) | -11.7 C (10.9 F) |
| Mar | 33.9 C (93.0 F) | -22.2 C (-8.0 F) | 33.9 C (93.0 F) | -11.1 C (12.0 F) |
| Apr | 34.4 C (93.9 F) | -11.1 C (12.0 F) | 28.3 C (82.9 F) | -8.3 C (17.1 F) |
| May | 39.4 C (102.9 F) | -9.4 C (15.1 F) | 36.7 C (98.1 F) | -0.6 C (30.9 F) |
| Jun | 41.7 C (107.1 F) | -3.9 C (25.0 F) | 39.4 C (102.9 F) | 3.9 C (39.0 F) |
| Jul | 43.3 C (109.9 F) | 2.8 C (37.0 F) | 42.8 C (109.0 F) | 8.9 C (48.0 F) |
| Aug | 43.3 C (109.9 F) | 1.7 C (35.1 F) | 42.2 C (108.0 F) | 10.6 C (51.1 F) |
| Sep | 41.1 C (106.0 F) | -6.1 C (21.0 F) | 33.0 C (91.4 F) | 7.0 C (44.6 F) |
| Oct | 33.9 C (93.0 F) | -18.9 C (-2.0 F) | n/a | n/a |
| Nov | 26.1 C (79.0 F) | -25.0 C (-13.0 F) | n/a | n/a |
| Dec | 22.2 C (72.0 F) | -34.4 C (-29.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1938 | 21 |
| 1939 | 18 |
| 1940 | 9 |
| 1941 | 11 |
| 1942 | 13 |
| 1943 | 19 |
| 1944 | 10 |
| 1945 | 18 |
| 1946 | 7 |
| 1947 | 11 |
| 1948 | 17 |
| 1949 | 48 |
| 1950 | 14 |
| 1951 | 15 |
| 1952 | 11 |
| 1953 | 19 |
| 1954 | 21 |
| 1955 | 25 |
| 1956 | 15 |
| 1957 | 19 |
| 1958 | 17 |
| 1959 | 16 |
| 1960 | 20 |
| 1961 | 9 |
| 1962 | 34 |
| 1963 | 23 |
| 1964 | 31 |
| 1965 | 18 |
| 1966 | 12 |
| 1967 | 14 |
| 1968 | 4 |
| 1970 | 12 |
| 1971 | 23 |
| 1972 | 23 |
| 1973 | 12 |
| 1974 | 10 |
| 1975 | 22 |
| 1976 | 15 |
| 1977 | 17 |
| 1978 | 22 |
| 1979 | 10 |
| 1980 | 10 |
| 1981 | 11 |
| 1982 | 15 |
| 1983 | 8 |
| 1984 | 13 |
| 1985 | 12 |
| 1986 | 11 |
| 1987 | 13 |
| 1988 | 13 |
| 1989 | 23 |
| 1990 | 25 |
| 1991 | 6 |
| 1992 | 15 |
| 1993 | 9 |
| 1994 | 8 |
| 1995 | 13 |
| 1996 | 20 |
| 1997 | 16 |
| 1998 | 14 |
| 1999 | 22 |
| 2000 | 15 |
| 2001 | 20 |
| 2002 | 33 |
| 2003 | 25 |
| 2004 | 9 |
| 2005 | 12 |
| 2006 | 24 |
| 2007 | 18 |
| 2008 | 20 |
| 2009 | 21 |
| 2010 | 16 |
| 2011 | 12 |
| 2012 | 19 |
| 2013 | 32 |
| 2014 | 14 |
| 2015 | 10 |
| 2017 | 13 |
| 2018 | 6 |
| 2019 | 9 |
| 2020 | 18 |
| 2021 | 24 |
| 2022 | 16 |
| 2023 | 15 |
| 2024 | 15 |
| 2025 | 35 |
| 2026 | 31 |
All-Time Record Progression
10 new records| Date | Kind | Detail |
|---|---|---|
| 1972-12-10 | Record low maximum temperature | Record low maximum temperature -16.7 C (1.9 F) |
| 1975-05-20 | Record daily snowfall | Record daily snowfall 40.6 cm (16.0 in) |
| 1989-02-06 | Record low minimum temperature | Record low minimum temperature -32.2 C (-26.0 F) |
| 1989-02-07 | Record low minimum temperature | Record low minimum temperature -32.8 C (-27.0 F) |
| 1990-12-23 | Record low minimum temperature | Record low minimum temperature -34.4 C (-29.9 F) |
| 1998-12-22 | Record low maximum temperature | Record low maximum temperature -17.8 C (0.0 F) |
| 1998-12-23 | Record low maximum temperature | Record low maximum temperature -18.3 C (-0.9 F) |
| 2013-06-30 | Record high minimum temperature | Record high minimum temperature 23.9 C (75.0 F) |
| 2017-07-12 | Record high minimum temperature | Record high minimum temperature 24.4 C (75.9 F) |
| 2021-08-18 | Record daily precipitation | Record daily precipitation 111.5 mm (4.4 in) |
Wettest Day of Each Month
Aug: 111.5 mm (4.4 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 17.0 mm (0.7 in) | 3 January 1997 |
| Feb | 22.6 mm (0.9 in) | 12 February 1949 |
| Mar | 24.4 mm (1.0 in) | 15 March 1945 |
| Apr | 31.0 mm (1.2 in) | 22 April 1957 |
| May | 30.7 mm (1.2 in) | 11 May 1947 |
| Jun | 27.4 mm (1.1 in) | 17 June 1939 |
| Jul | 26.7 mm (1.1 in) | 8 July 1982 |
| Aug | 111.5 mm (4.4 in) | 18 August 2021 |
| Sep | 36.8 mm (1.4 in) | 27 September 2014 |
| Oct | 65.8 mm (2.6 in) | 28 October 1946 |
| Nov | 26.4 mm (1.0 in) | 25 November 1978 |
| Dec | 40.6 mm (1.6 in) | 31 December 1951 |
Period of Record Coverage
1938 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1938 | 214 | 59% | No |
| 1939 | 364 | 100% | Yes |
| 1940 | 240 | 66% | No |
| 1941 | 365 | 100% | Yes |
| 1942 | 365 | 100% | Yes |
| 1943 | 310 | 85% | No |
| 1944 | 366 | 100% | Yes |
| 1945 | 364 | 100% | Yes |
| 1946 | 365 | 100% | Yes |
| 1947 | 365 | 100% | Yes |
| 1948 | 366 | 100% | Yes |
| 1949 | 345 | 95% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 365 | 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 | 364 | 100% | 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 | 121 | 33% | No |
| 1970 | 183 | 50% | No |
| 1971 | 352 | 96% | Yes |
| 1972 | 363 | 99% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 364 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 334 | 92% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 365 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 363 | 99% | Yes |
| 1984 | 365 | 100% | Yes |
| 1985 | 364 | 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 | 366 | 100% | Yes |
| 1993 | 365 | 100% | Yes |
| 1994 | 363 | 99% | Yes |
| 1995 | 365 | 100% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 363 | 99% | Yes |
| 1998 | 364 | 100% | Yes |
| 1999 | 364 | 100% | Yes |
| 2000 | 365 | 100% | Yes |
| 2001 | 364 | 100% | Yes |
| 2002 | 364 | 100% | Yes |
| 2003 | 364 | 100% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 364 | 100% | Yes |
| 2006 | 333 | 91% | Yes |
| 2007 | 364 | 100% | Yes |
| 2008 | 362 | 99% | Yes |
| 2009 | 363 | 99% | Yes |
| 2010 | 362 | 99% | Yes |
| 2011 | 363 | 99% | Yes |
| 2012 | 361 | 99% | Yes |
| 2013 | 343 | 94% | Yes |
| 2014 | 322 | 88% | No |
| 2015 | 165 | 45% | No |
| 2016 | 52 | 14% | No |
| 2017 | 279 | 76% | No |
| 2018 | 353 | 97% | Yes |
| 2019 | 221 | 61% | No |
| 2020 | 336 | 92% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 358 | 98% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 365 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 271 | 74% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 18 September 2026 | Delta, US | daily high min (Provisional) | 17.0 C (62.6 F) | 2.0 C (3.6 F) | 4 years | 13 of 100 (Routine) |
| 17 September 2026 | Delta, US | daily high min (Provisional) | 18.0 C (64.4 F) | 3.0 C (5.4 F) | 72 years | 35 of 100 (Notable) |
| 16 September 2026 | Delta, US | daily high min (Provisional) | 17.0 C (62.6 F) | 0.3 C (0.5 F) | 77 years | 31 of 100 (Routine) |
| 13 September 2026 | Delta, US | monthly high min (Tie, Provisional) | 20.0 C (68.0 F) | tie | 71 years | 9 of 100 (Routine) |
| 31 August 2026 | Delta, US | daily rain (Provisional) | 13.2 mm (0.5 in) | 3.5 mm (0.14 in) | 17 years | 17 of 100 (Routine) |
| 21 August 2026 | Delta, US | daily high max (Tie, Provisional) | 38.9 C (102.0 F) | tie | 0 years | 2 of 100 (Routine) |
| 20 August 2026 | Delta, US | daily high min (Tie, Provisional) | 18.9 C (66.0 F) | tie | 81 years | 8 of 100 (Routine) |
| 20 August 2026 | Delta, US | daily high max (Tie, Provisional) | 39.4 C (102.9 F) | tie | 0 years | 2 of 100 (Routine) |
| 14 August 2026 | Delta, US | daily rain | 18.0 mm (0.7 in) | 10.9 mm (0.4 in) | 41 years | 20 of 100 (Routine) |
| 10 August 2026 | Delta, US | daily high max (Tie) | 39.4 C (102.9 F) | tie | 23 years | 3 of 100 (Routine) |
| 9 August 2026 | Delta, US | daily high max | 40.6 C (105.1 F) | 0.6 C (1.1 F) | 85 years | 34 of 100 (Routine) |
| 8 August 2026 | Delta, US | daily high min | 18.9 C (66.0 F) | 0.6 C (1.1 F) | 84 years | 34 of 100 (Routine) |
| 8 August 2026 | Delta, US | daily high max (Tie) | 40.6 C (105.1 F) | tie | 24 years | 3 of 100 (Routine) |
| 7 August 2026 | Delta, US | daily high max | 41.1 C (106.0 F) | 0.5 C (0.9 F) | 28 years | 17 of 100 (Routine) |
| 3 August 2026 | Delta, US | daily high max (Tie) | 40.0 C (104.0 F) | tie | 5 years | 2 of 100 (Routine) |
| 2 August 2026 | Delta, US | daily high max | 41.7 C (107.1 F) | 1.1 C (2.0 F) | 5 years | 12 of 100 (Routine) |
| 2 August 2026 | Delta, US | daily high min (Tie) | 20.0 C (68.0 F) | tie | 76 years | 7 of 100 (Routine) |
| 31 July 2026 | Delta, US | daily high max | 40.6 C (105.1 F) | 0.6 C (1.1 F) | 88 years | 35 of 100 (Notable) |
| 29 July 2026 | Delta, US | daily high min | 23.9 C (75.0 F) | 2.8 C (5.0 F) | 79 years | 40 of 100 (Notable) |
| 28 July 2026 | Delta, US | daily high max (Tie) | 40.0 C (104.0 F) | tie | 20 years | 3 of 100 (Routine) |
Climate Trend
72 complete years, 1939 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1939 | 10.6 C | +0.46 C |
| 1941 | 10.3 C | +0.12 C |
| 1942 | 9.7 C | -0.53 C |
| 1944 | 9.5 C | -0.70 C |
| 1945 | 10.0 C | -0.19 C |
| 1946 | 10.5 C | +0.34 C |
| 1947 | 10.3 C | +0.13 C |
| 1948 | 9.5 C | -0.64 C |
| 1950 | 10.6 C | +0.45 C |
| 1951 | 9.9 C | -0.28 C |
| 1952 | 10.3 C | +0.13 C |
| 1953 | 10.8 C | +0.58 C |
| 1954 | 11.4 C | +1.22 C |
| 1955 | 9.4 C | -0.75 C |
| 1956 | 10.6 C | +0.39 C |
| 1957 | 10.3 C | +0.15 C |
| 1958 | 11.3 C | +1.08 C |
| 1959 | 10.6 C | +0.44 C |
| 1960 | 10.8 C | +0.62 C |
| 1961 | 10.4 C | +0.17 C |
| 1962 | 9.9 C | -0.26 C |
| 1963 | 10.4 C | +0.19 C |
| 1964 | 9.2 C | -0.99 C |
| 1965 | 10.0 C | -0.23 C |
| 1966 | 10.3 C | +0.11 C |
| 1967 | 9.6 C | -0.54 C |
| 1971 | 9.0 C | -1.20 C |
| 1972 | 10.1 C | -0.12 C |
| 1973 | 9.4 C | -0.83 C |
| 1974 | 10.4 C | +0.17 C |
| 1975 | 8.7 C | -1.45 C |
| 1976 | 9.5 C | -0.72 C |
| 1978 | 9.9 C | -0.32 C |
| 1979 | 9.4 C | -0.81 C |
| 1980 | 10.2 C | +0.01 C |
| 1981 | 10.9 C | +0.71 C |
| 1982 | 8.9 C | -1.26 C |
| 1983 | 10.3 C | +0.08 C |
| 1984 | 8.1 C | -2.04 C |
| 1985 | 9.4 C | -0.74 C |
| 1986 | 10.7 C | +0.56 C |
| 1987 | 10.1 C | -0.11 C |
| 1988 | 9.0 C | -1.14 C |
| 1989 | 9.4 C | -0.75 C |
| 1990 | 10.2 C | -0.02 C |
| 1991 | 9.3 C | -0.90 C |
| 1992 | 10.8 C | +0.62 C |
| 1993 | 9.1 C | -1.05 C |
| 1994 | 11.0 C | +0.77 C |
| 1995 | 10.7 C | +0.47 C |
| 1996 | 10.8 C | +0.64 C |
| 1997 | 10.2 C | -0.01 C |
| 1998 | 10.4 C | +0.18 C |
| 1999 | 10.8 C | +0.63 C |
| 2000 | 11.1 C | +0.93 C |
| 2001 | 10.6 C | +0.42 C |
| 2002 | 9.2 C | -1.01 C |
| 2003 | 10.1 C | -0.11 C |
| 2004 | 9.4 C | -0.82 C |
| 2005 | 10.7 C | +0.55 C |
| 2007 | 9.9 C | -0.26 C |
| 2008 | 9.6 C | -0.58 C |
| 2009 | 9.7 C | -0.47 C |
| 2010 | 10.6 C | +0.38 C |
| 2011 | 9.5 C | -0.70 C |
| 2012 | 10.9 C | +0.68 C |
| 2018 | 10.7 C | +0.56 C |
| 2021 | 11.9 C | +1.73 C |
| 2022 | 11.3 C | +1.10 C |
| 2023 | 10.5 C | +0.35 C |
| 2024 | 12.2 C | +2.02 C |
| 2025 | 12.6 C | +2.39 C |
The fitted trend in annual mean temperature here over 1939 to 2025 is 0.08 C (0.00 to 0.15) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.14 F (0.00 to 0.28) per decade. The slope is a straight line fitted to 72 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.08 C (0.00 to 0.15) per decade | 0.14 F (0.00 to 0.28) per decade | 1939 to 2025 | 72 | Not clearly different from zero |
| Mean daily maximum | 0.3 C (0.2 to 0.4) per decade | 0.5 F (0.3 to 0.6) per decade | 1939 to 2025 | 72 | Rise |
| Mean daily minimum | -0.10 C (-0.20 to -0.01) per decade | -0.19 F (-0.35 to -0.02) per decade | 1939 to 2025 | 72 | Fall |
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
1938 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 43.3 C (109.9 F) | 1938 | 39.4 C (102.9 F) | 88 |
| Coldest night (TNn) | -34.4 C (-29.9 F) | 1990 | -21.7 C (-7.1 F) | 88 |
| Wettest day (Rx1day) | 111.5 mm (4.4 in) | 2021 | 17.8 mm (0.7 in) | 88 |
| Wettest five days (Rx5day) | 148.1 mm (5.8 in) | 2021 | 28.3 mm (1.1 in) | 88 |
| Longest dry spell (CDD) | 109 days | 1944 | 46 days | 88 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1938 | 43.3 C (109.9 F) |
| 1939 | 41.1 C (106.0 F) |
| 1940 | 40.6 C (105.1 F) |
| 1941 | 38.3 C (100.9 F) |
| 1942 | 40.6 C (105.1 F) |
| 1943 | 41.1 C (106.0 F) |
| 1944 | 37.2 C (99.0 F) |
| 1945 | 37.8 C (100.0 F) |
| 1946 | 38.3 C (100.9 F) |
| 1947 | 37.8 C (100.0 F) |
| 1948 | 37.2 C (99.0 F) |
| 1949 | 37.8 C (100.0 F) |
| 1950 | 38.9 C (102.0 F) |
| 1951 | 40.6 C (105.1 F) |
| 1952 | 37.8 C (100.0 F) |
| 1953 | 39.4 C (102.9 F) |
| 1954 | 41.1 C (106.0 F) |
| 1955 | 38.9 C (102.0 F) |
| 1956 | 38.3 C (100.9 F) |
| 1957 | 38.3 C (100.9 F) |
| 1958 | 39.4 C (102.9 F) |
| 1959 | 39.4 C (102.9 F) |
| 1960 | 40.6 C (105.1 F) |
| 1961 | 38.9 C (102.0 F) |
| 1962 | 38.3 C (100.9 F) |
| 1963 | 37.8 C (100.0 F) |
| 1964 | 37.8 C (100.0 F) |
| 1965 | 36.7 C (98.1 F) |
| 1966 | 38.9 C (102.0 F) |
| 1967 | 38.3 C (100.9 F) |
| 1968 | 25.6 C (78.1 F) |
| 1970 | 39.4 C (102.9 F) |
| 1971 | 38.9 C (102.0 F) |
| 1972 | 40.0 C (104.0 F) |
| 1973 | 40.0 C (104.0 F) |
| 1974 | 40.6 C (105.1 F) |
| 1975 | 37.8 C (100.0 F) |
| 1976 | 38.9 C (102.0 F) |
| 1977 | 40.0 C (104.0 F) |
| 1978 | 37.8 C (100.0 F) |
| 1979 | 39.4 C (102.9 F) |
| 1980 | 38.3 C (100.9 F) |
| 1981 | 40.0 C (104.0 F) |
| 1982 | 38.3 C (100.9 F) |
| 1983 | 37.8 C (100.0 F) |
| 1984 | 37.8 C (100.0 F) |
| 1985 | 38.9 C (102.0 F) |
| 1986 | 37.8 C (100.0 F) |
| 1987 | 37.8 C (100.0 F) |
| 1988 | 38.9 C (102.0 F) |
| 1989 | 40.0 C (104.0 F) |
| 1990 | 40.0 C (104.0 F) |
| 1991 | 38.9 C (102.0 F) |
| 1992 | 38.3 C (100.9 F) |
| 1993 | 35.6 C (96.1 F) |
| 1994 | 40.0 C (104.0 F) |
| 1995 | 40.0 C (104.0 F) |
| 1996 | 40.0 C (104.0 F) |
| 1997 | 39.4 C (102.9 F) |
| 1998 | 42.2 C (108.0 F) |
| 1999 | 37.8 C (100.0 F) |
| 2000 | 40.6 C (105.1 F) |
| 2001 | 42.8 C (109.0 F) |
| 2002 | 43.3 C (109.9 F) |
| 2003 | 42.2 C (108.0 F) |
| 2004 | 39.4 C (102.9 F) |
| 2005 | 41.7 C (107.1 F) |
| 2006 | 42.8 C (109.0 F) |
| 2007 | 41.7 C (107.1 F) |
| 2008 | 40.6 C (105.1 F) |
| 2009 | 42.2 C (108.0 F) |
| 2010 | 40.6 C (105.1 F) |
| 2011 | 41.1 C (106.0 F) |
| 2012 | 42.2 C (108.0 F) |
| 2013 | 41.1 C (106.0 F) |
| 2014 | 38.3 C (100.9 F) |
| 2015 | 36.1 C (97.0 F) |
| 2016 | 32.8 C (91.0 F) |
| 2017 | 38.9 C (102.0 F) |
| 2018 | 38.3 C (100.9 F) |
| 2019 | 28.3 C (82.9 F) |
| 2020 | 41.1 C (106.0 F) |
| 2021 | 41.7 C (107.1 F) |
| 2022 | 42.2 C (108.0 F) |
| 2023 | 41.7 C (107.1 F) |
| 2024 | 42.2 C (108.0 F) |
| 2025 | 41.1 C (106.0 F) |
| 2026 | 42.8 C (109.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1938 | -21.1 C (-6.0 F) |
| 1939 | -21.7 C (-7.1 F) |
| 1940 | -31.7 C (-25.1 F) |
| 1941 | -18.3 C (-0.9 F) |
| 1942 | -26.1 C (-15.0 F) |
| 1943 | -22.8 C (-9.0 F) |
| 1944 | -21.1 C (-6.0 F) |
| 1945 | -18.3 C (-0.9 F) |
| 1946 | -20.0 C (-4.0 F) |
| 1947 | -21.7 C (-7.1 F) |
| 1948 | -26.1 C (-15.0 F) |
| 1949 | -31.7 C (-25.1 F) |
| 1950 | -23.3 C (-9.9 F) |
| 1951 | -29.4 C (-20.9 F) |
| 1952 | -23.3 C (-9.9 F) |
| 1953 | -16.7 C (1.9 F) |
| 1954 | -18.9 C (-2.0 F) |
| 1955 | -26.1 C (-15.0 F) |
| 1956 | -21.1 C (-6.0 F) |
| 1957 | -25.0 C (-13.0 F) |
| 1958 | -20.0 C (-4.0 F) |
| 1959 | -19.4 C (-2.9 F) |
| 1960 | -29.4 C (-20.9 F) |
| 1961 | -20.0 C (-4.0 F) |
| 1962 | -28.9 C (-20.0 F) |
| 1963 | -29.4 C (-20.9 F) |
| 1964 | -20.0 C (-4.0 F) |
| 1965 | -20.0 C (-4.0 F) |
| 1966 | -22.2 C (-8.0 F) |
| 1967 | -23.9 C (-11.0 F) |
| 1968 | -24.4 C (-11.9 F) |
| 1970 | -19.4 C (-2.9 F) |
| 1971 | -31.7 C (-25.1 F) |
| 1972 | -31.1 C (-24.0 F) |
| 1973 | -29.4 C (-20.9 F) |
| 1974 | -21.1 C (-6.0 F) |
| 1975 | -22.2 C (-8.0 F) |
| 1976 | -23.3 C (-9.9 F) |
| 1977 | -21.7 C (-7.1 F) |
| 1978 | -21.1 C (-6.0 F) |
| 1979 | -30.0 C (-22.0 F) |
| 1980 | -25.6 C (-14.1 F) |
| 1981 | -18.9 C (-2.0 F) |
| 1982 | -20.6 C (-5.1 F) |
| 1983 | -17.2 C (1.0 F) |
| 1984 | -30.6 C (-23.1 F) |
| 1985 | -20.6 C (-5.1 F) |
| 1986 | -15.6 C (3.9 F) |
| 1987 | -26.1 C (-15.0 F) |
| 1988 | -28.3 C (-18.9 F) |
| 1989 | -32.8 C (-27.0 F) |
| 1990 | -34.4 C (-29.9 F) |
| 1991 | -23.3 C (-9.9 F) |
| 1992 | -20.6 C (-5.1 F) |
| 1993 | -25.0 C (-13.0 F) |
| 1994 | -17.2 C (1.0 F) |
| 1995 | -22.2 C (-8.0 F) |
| 1996 | -18.9 C (-2.0 F) |
| 1997 | -25.6 C (-14.1 F) |
| 1998 | -31.7 C (-25.1 F) |
| 1999 | -16.7 C (1.9 F) |
| 2000 | -16.7 C (1.9 F) |
| 2001 | -21.1 C (-6.0 F) |
| 2002 | -20.0 C (-4.0 F) |
| 2003 | -20.0 C (-4.0 F) |
| 2004 | -24.4 C (-11.9 F) |
| 2005 | -18.9 C (-2.0 F) |
| 2006 | -25.0 C (-13.0 F) |
| 2007 | -31.1 C (-24.0 F) |
| 2008 | -21.1 C (-6.0 F) |
| 2009 | -27.8 C (-18.0 F) |
| 2010 | -24.4 C (-11.9 F) |
| 2011 | -21.1 C (-6.0 F) |
| 2012 | -23.3 C (-9.9 F) |
| 2013 | -30.0 C (-22.0 F) |
| 2014 | -20.0 C (-4.0 F) |
| 2015 | -19.4 C (-2.9 F) |
| 2016 | -3.3 C (26.1 F) |
| 2017 | -16.7 C (1.9 F) |
| 2018 | -22.2 C (-8.0 F) |
| 2019 | -23.9 C (-11.0 F) |
| 2020 | -18.9 C (-2.0 F) |
| 2021 | -19.4 C (-2.9 F) |
| 2022 | -18.3 C (-0.9 F) |
| 2023 | -21.1 C (-6.0 F) |
| 2024 | -14.4 C (6.1 F) |
| 2025 | -20.0 C (-4.0 F) |
| 2026 | -16.7 C (1.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1938 | 11.9 mm (0.5 in) |
| 1939 | 27.4 mm (1.1 in) |
| 1940 | 18.8 mm (0.7 in) |
| 1941 | 18.5 mm (0.7 in) |
| 1942 | 10.7 mm (0.4 in) |
| 1943 | 18.3 mm (0.7 in) |
| 1944 | 14.7 mm (0.6 in) |
| 1945 | 24.4 mm (1.0 in) |
| 1946 | 65.8 mm (2.6 in) |
| 1947 | 30.7 mm (1.2 in) |
| 1948 | 12.2 mm (0.5 in) |
| 1949 | 22.6 mm (0.9 in) |
| 1950 | 10.2 mm (0.4 in) |
| 1951 | 40.6 mm (1.6 in) |
| 1952 | 15.2 mm (0.6 in) |
| 1953 | 30.5 mm (1.2 in) |
| 1954 | 15.5 mm (0.6 in) |
| 1955 | 14.7 mm (0.6 in) |
| 1956 | 11.4 mm (0.4 in) |
| 1957 | 31.0 mm (1.2 in) |
| 1958 | 19.3 mm (0.8 in) |
| 1959 | 14.0 mm (0.6 in) |
| 1960 | 13.2 mm (0.5 in) |
| 1961 | 13.7 mm (0.5 in) |
| 1962 | 24.9 mm (1.0 in) |
| 1963 | 16.5 mm (0.6 in) |
| 1964 | 14.5 mm (0.6 in) |
| 1965 | 22.9 mm (0.9 in) |
| 1966 | 34.0 mm (1.3 in) |
| 1967 | 19.1 mm (0.8 in) |
| 1968 | 11.7 mm (0.5 in) |
| 1970 | 27.7 mm (1.1 in) |
| 1971 | 21.8 mm (0.9 in) |
| 1972 | 17.0 mm (0.7 in) |
| 1973 | 14.7 mm (0.6 in) |
| 1974 | 9.9 mm (0.39 in) |
| 1975 | 23.4 mm (0.9 in) |
| 1976 | 12.4 mm (0.5 in) |
| 1977 | 10.9 mm (0.4 in) |
| 1978 | 26.4 mm (1.0 in) |
| 1979 | 31.8 mm (1.3 in) |
| 1980 | 22.4 mm (0.9 in) |
| 1981 | 27.9 mm (1.1 in) |
| 1982 | 31.8 mm (1.3 in) |
| 1983 | 14.5 mm (0.6 in) |
| 1984 | 19.8 mm (0.8 in) |
| 1985 | 14.0 mm (0.6 in) |
| 1986 | 19.8 mm (0.8 in) |
| 1987 | 8.4 mm (0.33 in) |
| 1988 | 15.2 mm (0.6 in) |
| 1989 | 11.7 mm (0.5 in) |
| 1990 | 17.0 mm (0.7 in) |
| 1991 | 21.6 mm (0.9 in) |
| 1992 | 14.2 mm (0.6 in) |
| 1993 | 16.8 mm (0.7 in) |
| 1994 | 18.0 mm (0.7 in) |
| 1995 | 16.3 mm (0.6 in) |
| 1996 | 14.7 mm (0.6 in) |
| 1997 | 17.0 mm (0.7 in) |
| 1998 | 20.6 mm (0.8 in) |
| 1999 | 23.4 mm (0.9 in) |
| 2000 | 31.0 mm (1.2 in) |
| 2001 | 7.6 mm (0.30 in) |
| 2002 | 17.8 mm (0.7 in) |
| 2003 | 22.4 mm (0.9 in) |
| 2004 | 17.8 mm (0.7 in) |
| 2005 | 18.8 mm (0.7 in) |
| 2006 | 19.1 mm (0.8 in) |
| 2007 | 33.5 mm (1.3 in) |
| 2008 | 24.9 mm (1.0 in) |
| 2009 | 11.9 mm (0.5 in) |
| 2010 | 20.6 mm (0.8 in) |
| 2011 | 14.7 mm (0.6 in) |
| 2012 | 16.8 mm (0.7 in) |
| 2013 | 13.7 mm (0.5 in) |
| 2014 | 36.8 mm (1.4 in) |
| 2015 | 10.2 mm (0.4 in) |
| 2016 | 11.4 mm (0.4 in) |
| 2017 | 17.8 mm (0.7 in) |
| 2018 | 28.2 mm (1.1 in) |
| 2019 | 14.0 mm (0.6 in) |
| 2020 | 7.9 mm (0.31 in) |
| 2021 | 111.5 mm (4.4 in) |
| 2022 | 19.1 mm (0.8 in) |
| 2023 | 11.4 mm (0.4 in) |
| 2024 | 16.5 mm (0.6 in) |
| 2025 | 23.1 mm (0.9 in) |
| 2026 | 19.1 mm (0.8 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1938 | 14.7 mm (0.6 in) |
| 1939 | 27.4 mm (1.1 in) |
| 1940 | 18.8 mm (0.7 in) |
| 1941 | 22.8 mm (0.9 in) |
| 1942 | 19.3 mm (0.8 in) |
| 1943 | 31.6 mm (1.2 in) |
| 1944 | 21.1 mm (0.8 in) |
| 1945 | 35.1 mm (1.4 in) |
| 1946 | 85.6 mm (3.4 in) |
| 1947 | 41.4 mm (1.6 in) |
| 1948 | 19.8 mm (0.8 in) |
| 1949 | 26.1 mm (1.0 in) |
| 1950 | 13.2 mm (0.5 in) |
| 1951 | 88.3 mm (3.5 in) |
| 1952 | 88.3 mm (3.5 in) |
| 1953 | 32.5 mm (1.3 in) |
| 1954 | 17.5 mm (0.7 in) |
| 1955 | 23.9 mm (0.9 in) |
| 1956 | 17.2 mm (0.7 in) |
| 1957 | 51.4 mm (2.0 in) |
| 1958 | 23.9 mm (0.9 in) |
| 1959 | 24.2 mm (1.0 in) |
| 1960 | 30.3 mm (1.2 in) |
| 1961 | 21.9 mm (0.9 in) |
| 1962 | 33.9 mm (1.3 in) |
| 1963 | 21.8 mm (0.9 in) |
| 1964 | 35.8 mm (1.4 in) |
| 1965 | 38.9 mm (1.5 in) |
| 1966 | 52.5 mm (2.1 in) |
| 1967 | 30.7 mm (1.2 in) |
| 1968 | 19.1 mm (0.8 in) |
| 1970 | 30.0 mm (1.2 in) |
| 1971 | 34.7 mm (1.4 in) |
| 1972 | 17.8 mm (0.7 in) |
| 1973 | 19.5 mm (0.8 in) |
| 1974 | 14.8 mm (0.6 in) |
| 1975 | 33.1 mm (1.3 in) |
| 1976 | 14.8 mm (0.6 in) |
| 1977 | 21.1 mm (0.8 in) |
| 1978 | 35.0 mm (1.4 in) |
| 1979 | 38.2 mm (1.5 in) |
| 1980 | 48.8 mm (1.9 in) |
| 1981 | 37.0 mm (1.5 in) |
| 1982 | 77.0 mm (3.0 in) |
| 1983 | 25.5 mm (1.0 in) |
| 1984 | 32.8 mm (1.3 in) |
| 1985 | 29.8 mm (1.2 in) |
| 1986 | 30.0 mm (1.2 in) |
| 1987 | 19.0 mm (0.7 in) |
| 1988 | 20.3 mm (0.8 in) |
| 1989 | 22.1 mm (0.9 in) |
| 1990 | 19.9 mm (0.8 in) |
| 1991 | 45.3 mm (1.8 in) |
| 1992 | 19.5 mm (0.8 in) |
| 1993 | 30.3 mm (1.2 in) |
| 1994 | 32.0 mm (1.3 in) |
| 1995 | 27.8 mm (1.1 in) |
| 1996 | 28.7 mm (1.1 in) |
| 1997 | 22.3 mm (0.9 in) |
| 1998 | 36.8 mm (1.4 in) |
| 1999 | 29.5 mm (1.2 in) |
| 2000 | 67.6 mm (2.7 in) |
| 2001 | 14.1 mm (0.6 in) |
| 2002 | 33.3 mm (1.3 in) |
| 2003 | 32.0 mm (1.3 in) |
| 2004 | 37.9 mm (1.5 in) |
| 2005 | 32.0 mm (1.3 in) |
| 2006 | 24.1 mm (0.9 in) |
| 2007 | 34.1 mm (1.3 in) |
| 2008 | 30.0 mm (1.2 in) |
| 2009 | 27.9 mm (1.1 in) |
| 2010 | 36.5 mm (1.4 in) |
| 2011 | 25.9 mm (1.0 in) |
| 2012 | 27.2 mm (1.1 in) |
| 2013 | 19.1 mm (0.8 in) |
| 2014 | 45.7 mm (1.8 in) |
| 2015 | 16.5 mm (0.6 in) |
| 2016 | 17.2 mm (0.7 in) |
| 2017 | 33.1 mm (1.3 in) |
| 2018 | 51.5 mm (2.0 in) |
| 2019 | 27.0 mm (1.1 in) |
| 2020 | 6.3 mm (0.25 in) |
| 2021 | 148.1 mm (5.8 in) |
| 2022 | 19.1 mm (0.8 in) |
| 2023 | 17.1 mm (0.7 in) |
| 2024 | 30.7 mm (1.2 in) |
| 2025 | 27.3 mm (1.1 in) |
| 2026 | 20.2 mm (0.8 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1938 | 57 days |
| 1939 | 75 days |
| 1940 | 37 days |
| 1941 | 39 days |
| 1942 | 75 days |
| 1943 | 45 days |
| 1944 | 109 days |
| 1945 | 40 days |
| 1946 | 53 days |
| 1947 | 27 days |
| 1948 | 39 days |
| 1949 | 67 days |
| 1950 | 76 days |
| 1951 | 37 days |
| 1952 | 55 days |
| 1953 | 71 days |
| 1954 | 34 days |
| 1955 | 37 days |
| 1956 | 80 days |
| 1957 | 38 days |
| 1958 | 69 days |
| 1959 | 43 days |
| 1960 | 75 days |
| 1961 | 48 days |
| 1962 | 59 days |
| 1963 | 57 days |
| 1964 | 51 days |
| 1965 | 59 days |
| 1966 | 40 days |
| 1967 | 44 days |
| 1968 | 15 days |
| 1970 | 46 days |
| 1971 | 55 days |
| 1972 | 109 days |
| 1973 | 32 days |
| 1974 | 95 days |
| 1975 | 37 days |
| 1976 | 47 days |
| 1977 | 49 days |
| 1978 | 60 days |
| 1979 | 68 days |
| 1980 | 65 days |
| 1981 | 25 days |
| 1982 | 33 days |
| 1983 | 41 days |
| 1984 | 29 days |
| 1985 | 34 days |
| 1986 | 40 days |
| 1987 | 43 days |
| 1988 | 29 days |
| 1989 | 46 days |
| 1990 | 38 days |
| 1991 | 32 days |
| 1992 | 38 days |
| 1993 | 35 days |
| 1994 | 51 days |
| 1995 | 68 days |
| 1996 | 48 days |
| 1997 | 36 days |
| 1998 | 37 days |
| 1999 | 49 days |
| 2000 | 38 days |
| 2001 | 38 days |
| 2002 | 97 days |
| 2003 | 37 days |
| 2004 | 30 days |
| 2005 | 65 days |
| 2006 | 44 days |
| 2007 | 48 days |
| 2008 | 51 days |
| 2009 | 43 days |
| 2010 | 47 days |
| 2011 | 40 days |
| 2012 | 47 days |
| 2013 | 37 days |
| 2014 | 55 days |
| 2015 | 52 days |
| 2016 | 21 days |
| 2017 | 82 days |
| 2018 | 72 days |
| 2019 | 32 days |
| 2020 | 107 days |
| 2021 | 38 days |
| 2022 | 51 days |
| 2023 | 43 days |
| 2024 | 41 days |
| 2025 | 79 days |
| 2026 | 46 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
72 years with a frostAcross 72 years with a frost, the median last spring frost at Delta falls on 18 May and the median first autumn frost on 27 September, which leaves a median of 134 days between them.
In 1988 to 2025 the median growing season was 134 days. That is 3 days fewer than in 1939 to 1974.
Fitted over all years, the growing season changes by -1.2 days per decade at this station.
| Measure | Median, all years | Earliest period (1939 to 1974) | Recent period (1988 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 18 May | 15 May | 18 May | 3 days later | +1.0 days per decade |
| First autumn frost | 27 September | 27 September | 27 September | no change | -0.2 days per decade |
| Growing days | 134 days | 137 days | 134 days | 3 days fewer | -1.2 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
77 years, 1939 to 2025A day with at least 17.8 mm (0.7 in) of rain is expected about once in 2 years. A day with at least 70.8 mm (2.8 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 17.8 mm (0.7 in) | |
| 5 years | 26.4 mm (1.0 in) | |
| 10 years | 33.8 mm (1.3 in) | |
| 25 years | 45.8 mm (1.8 in) | |
| 50 years | 57.1 mm (2.2 in) | |
| 100 years | 70.8 mm (2.8 in) | Longer than the 77 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, 77 years of values from 1939 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: 111.5 mm (4.4 in) in 2021; 65.8 mm (2.6 in) in 1946; 40.6 mm (1.6 in) in 1951.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Climate Twins
2003 to 2025 against 1961 to 1990Over 2003 to 2025, Delta had a mean temperature of 10.6 C (51.1 F) and 209.0 mm (8.2 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Wah Wah Rch (United States, 120 km away), Saltair Salt Plt (United States, 164 km away) and Hovenweep Nm (United States, 375 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Wah Wah Rch | United States | 120 km (75 mi) | 10.6 C (51.0 F) | 174.2 mm (6.9 in) | 0.53 |
| Saltair Salt Plt | United States | 164 km (102 mi) | 10.4 C (50.7 F) | 310.5 mm (12.2 in) | 0.62 |
| Hovenweep Nm | United States | 375 km (233 mi) | 10.7 C (51.3 F) | 281.4 mm (11.1 in) | 0.73 |
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 (2026-10-15).