Mormon Flat Weather Records (USC00025700)
Record envelope, standing records and threshold days for Mormon Flat (USC00025700), Arizona, United States, with 104 years of record.
Key Facts for Mormon Flat
- Mormon Flat (USC00025700) is a weather station in Arizona, United States at 33.55 latitude and -111.45 longitude, 520 m (1,705 ft) above sea level.
- The station reports from 1923 to 2026, 104 years of record.
- 1,464 records set at Mormon Flat still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Mormon Flat set a daily record low maximum temperature of 30.6 C (87.1 F) on 1 September 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Arizona, United States, 33.55 latitude, -111.45 longitude.
- Elevation: 520 m (1,705 ft).
- Period of record: 1923 to 2026, 104 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
11 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 27.8 C (82.0 F) | -8.3 C (17.1 F) | 25.0 C (77.0 F) | 3.9 C (39.0 F) |
| Feb | 32.2 C (90.0 F) | -5.6 C (21.9 F) | 31.1 C (88.0 F) | 6.1 C (43.0 F) |
| Mar | 40.6 C (105.1 F) | -6.7 C (19.9 F) | 40.6 C (105.1 F) | 6.1 C (43.0 F) |
| Apr | 39.4 C (102.9 F) | -0.6 C (30.9 F) | 34.4 C (93.9 F) | 13.3 C (55.9 F) |
| May | 45.6 C (114.1 F) | 3.9 C (39.0 F) | 40.0 C (104.0 F) | 12.8 C (55.0 F) |
| Jun | 48.9 C (120.0 F) | 11.7 C (53.1 F) | 42.2 C (108.0 F) | 20.6 C (69.1 F) |
| Jul | 47.8 C (118.0 F) | 12.2 C (54.0 F) | 43.9 C (111.0 F) | 18.9 C (66.0 F) |
| Aug | 46.7 C (116.1 F) | 13.9 C (57.0 F) | 46.7 C (116.1 F) | 22.2 C (72.0 F) |
| Sep | 46.1 C (115.0 F) | 10.0 C (50.0 F) | 40.0 C (104.0 F) | 17.2 C (63.0 F) |
| Oct | 43.3 C (109.9 F) | 2.2 C (36.0 F) | 38.9 C (102.0 F) | 16.7 C (62.1 F) |
| Nov | 35.0 C (95.0 F) | -2.8 C (27.0 F) | n/a | n/a |
| Dec | 28.3 C (82.9 F) | -7.8 C (18.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1923 | 7 |
| 1924 | 2 |
| 1925 | 33 |
| 1926 | 16 |
| 1927 | 14 |
| 1928 | 14 |
| 1929 | 16 |
| 1930 | 19 |
| 1931 | 15 |
| 1932 | 20 |
| 1933 | 32 |
| 1934 | 51 |
| 1935 | 16 |
| 1936 | 26 |
| 1937 | 30 |
| 1938 | 11 |
| 1939 | 27 |
| 1940 | 5 |
| 1941 | 9 |
| 1942 | 12 |
| 1943 | 16 |
| 1944 | 11 |
| 1945 | 11 |
| 1946 | 15 |
| 1947 | 17 |
| 1948 | 24 |
| 1949 | 28 |
| 1950 | 28 |
| 1951 | 17 |
| 1952 | 15 |
| 1953 | 10 |
| 1954 | 12 |
| 1955 | 24 |
| 1956 | 8 |
| 1957 | 13 |
| 1958 | 18 |
| 1959 | 12 |
| 1960 | 8 |
| 1961 | 7 |
| 1962 | 19 |
| 1963 | 17 |
| 1964 | 15 |
| 1965 | 21 |
| 1966 | 12 |
| 1967 | 12 |
| 1968 | 13 |
| 1969 | 26 |
| 1970 | 21 |
| 1971 | 38 |
| 1972 | 18 |
| 1973 | 22 |
| 1974 | 10 |
| 1975 | 26 |
| 1976 | 20 |
| 1977 | 5 |
| 1978 | 17 |
| 1979 | 17 |
| 1980 | 27 |
| 1981 | 7 |
| 1982 | 9 |
| 1983 | 12 |
| 1984 | 9 |
| 1985 | 23 |
| 1986 | 19 |
| 1987 | 14 |
| 1988 | 8 |
| 1989 | 20 |
| 1990 | 17 |
| 1991 | 9 |
| 1992 | 13 |
| 1993 | 11 |
| 1994 | 9 |
| 1995 | 6 |
| 1996 | 3 |
| 1997 | 5 |
| 1998 | 2 |
| 1999 | 9 |
| 2000 | 6 |
| 2001 | 8 |
| 2002 | 5 |
| 2003 | 20 |
| 2004 | 8 |
| 2005 | 7 |
| 2006 | 6 |
| 2007 | 11 |
| 2008 | 8 |
| 2009 | 10 |
| 2010 | 4 |
| 2011 | 10 |
| 2012 | 7 |
| 2013 | 5 |
| 2014 | 5 |
| 2015 | 4 |
| 2016 | 7 |
| 2017 | 11 |
| 2018 | 13 |
| 2019 | 7 |
| 2020 | 15 |
| 2021 | 9 |
| 2022 | 3 |
| 2023 | 9 |
| 2024 | 12 |
| 2025 | 7 |
| 2026 | 17 |
All-Time Record Progression
3 new records| Date | Kind | Detail |
|---|---|---|
| 1970-06-26 | Record high maximum temperature | Record high maximum temperature 48.9 C (120.0 F) |
| 2003-12-26 | Record low minimum temperature | Record low minimum temperature -7.8 C (18.0 F) |
| 2004-01-28 | Record low minimum temperature | Record low minimum temperature -8.3 C (17.1 F) |
Wettest Day of Each Month
Aug: 114.0 mm (4.5 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 69.9 mm (2.8 in) | 8 January 1993 |
| Feb | 96.0 mm (3.8 in) | 22 February 2019 |
| Mar | 53.8 mm (2.1 in) | 11 March 2006 |
| Apr | 54.6 mm (2.1 in) | 12 April 1941 |
| May | 35.6 mm (1.4 in) | 2 May 1941 |
| Jun | 50.5 mm (2.0 in) | 18 June 1949 |
| Jul | 62.2 mm (2.4 in) | 24 July 1992 |
| Aug | 114.0 mm (4.5 in) | 8 August 1930 |
| Sep | 106.7 mm (4.2 in) | 6 September 1970 |
| Oct | 93.5 mm (3.7 in) | 30 October 1959 |
| Nov | 59.7 mm (2.4 in) | 22 November 1931 |
| Dec | 81.3 mm (3.2 in) | 18 December 1978 |
Period of Record Coverage
1923 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1923 | 150 | 41% | No |
| 1924 | 120 | 33% | No |
| 1925 | 165 | 45% | No |
| 1926 | 336 | 92% | Yes |
| 1927 | 344 | 94% | Yes |
| 1928 | 334 | 91% | Yes |
| 1929 | 358 | 98% | Yes |
| 1930 | 331 | 91% | Yes |
| 1931 | 353 | 97% | Yes |
| 1932 | 353 | 96% | Yes |
| 1933 | 352 | 96% | Yes |
| 1934 | 365 | 100% | Yes |
| 1935 | 356 | 98% | Yes |
| 1936 | 366 | 100% | Yes |
| 1937 | 329 | 90% | Yes |
| 1938 | 356 | 98% | Yes |
| 1939 | 344 | 94% | Yes |
| 1940 | 334 | 91% | Yes |
| 1941 | 319 | 87% | No |
| 1942 | 331 | 91% | Yes |
| 1943 | 346 | 95% | Yes |
| 1944 | 340 | 93% | Yes |
| 1945 | 332 | 91% | Yes |
| 1946 | 364 | 100% | Yes |
| 1947 | 365 | 100% | Yes |
| 1948 | 366 | 100% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 344 | 94% | Yes |
| 1951 | 343 | 94% | Yes |
| 1952 | 353 | 96% | Yes |
| 1953 | 344 | 94% | Yes |
| 1954 | 352 | 96% | Yes |
| 1955 | 359 | 98% | Yes |
| 1956 | 365 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 362 | 99% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 364 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 342 | 93% | Yes |
| 1969 | 305 | 84% | No |
| 1970 | 357 | 98% | Yes |
| 1971 | 362 | 99% | Yes |
| 1972 | 333 | 91% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 364 | 100% | Yes |
| 1975 | 361 | 99% | Yes |
| 1976 | 320 | 87% | No |
| 1977 | 357 | 98% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 315 | 86% | No |
| 1980 | 335 | 92% | Yes |
| 1981 | 363 | 99% | Yes |
| 1982 | 334 | 92% | Yes |
| 1983 | 357 | 98% | Yes |
| 1984 | 363 | 99% | Yes |
| 1985 | 333 | 91% | Yes |
| 1986 | 353 | 97% | Yes |
| 1987 | 357 | 98% | Yes |
| 1988 | 356 | 97% | Yes |
| 1989 | 335 | 92% | Yes |
| 1990 | 362 | 99% | Yes |
| 1991 | 353 | 97% | Yes |
| 1992 | 343 | 94% | Yes |
| 1993 | 307 | 84% | No |
| 1994 | 221 | 61% | No |
| 1995 | 140 | 38% | No |
| 1996 | 150 | 41% | No |
| 1997 | 106 | 29% | No |
| 1998 | 26 | 7% | No |
| 1999 | 107 | 29% | No |
| 2000 | 82 | 22% | No |
| 2001 | 129 | 35% | No |
| 2002 | 66 | 18% | No |
| 2003 | 128 | 35% | No |
| 2004 | 103 | 28% | No |
| 2005 | 135 | 37% | No |
| 2006 | 178 | 49% | No |
| 2007 | 214 | 59% | No |
| 2008 | 220 | 60% | No |
| 2009 | 208 | 57% | No |
| 2010 | 209 | 57% | No |
| 2011 | 185 | 51% | No |
| 2012 | 194 | 53% | No |
| 2013 | 217 | 59% | No |
| 2014 | 188 | 52% | No |
| 2015 | 154 | 42% | No |
| 2016 | 143 | 39% | No |
| 2017 | 217 | 59% | No |
| 2018 | 236 | 65% | No |
| 2019 | 237 | 65% | No |
| 2020 | 231 | 63% | No |
| 2021 | 235 | 64% | No |
| 2022 | 231 | 63% | No |
| 2023 | 214 | 59% | No |
| 2024 | 163 | 45% | No |
| 2025 | 128 | 35% | No |
| 2026 | 142 | 39% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 1 September 2026 | Mormon Flat, US | daily low max (Provisional) | 30.6 C (87.1 F) | 0.5 C (0.9 F) | 95 years | 39 of 100 (Notable) |
| 28 August 2026 | Mormon Flat, US | daily high min (Provisional) | 30.6 C (87.1 F) | 0.6 C (1.1 F) | 59 years | 29 of 100 (Routine) |
| 28 August 2026 | Mormon Flat, US | daily high max (Provisional) | 44.4 C (111.9 F) | 0.5 C (0.9 F) | 20 years | 17 of 100 (Routine) |
| 27 August 2026 | Mormon Flat, US | daily high min (Provisional) | 32.2 C (90.0 F) | 2.2 C (4.0 F) | 4 years | 19 of 100 (Routine) |
| 27 August 2026 | Mormon Flat, US | monthly high max (Tie, Provisional) | 46.7 C (116.1 F) | tie | 93 years | 11 of 100 (Routine) |
| 19 August 2026 | Mormon Flat, US | daily high min (Provisional) | 30.6 C (87.1 F) | 0.6 C (1.1 F) | 75 years | 34 of 100 (Routine) |
| 19 August 2026 | Mormon Flat, US | daily high max (Provisional) | 44.4 C (111.9 F) | 1.1 C (2.0 F) | 52 years | 28 of 100 (Routine) |
| 17 July 2026 | Mormon Flat, US | daily rain | 54.6 mm (2.1 in) | 4.6 mm (0.18 in) | 59 years | 31 of 100 (Routine) |
| 14 July 2026 | Mormon Flat, US | daily rain | 27.7 mm (1.1 in) | 9.9 mm (0.39 in) | 21 years | 25 of 100 (Routine) |
| 31 March 2026 | Mormon Flat, US | daily high min | 21.7 C (71.1 F) | 2.8 C (5.0 F) | 92 years | 44 of 100 (Notable) |
| 27 March 2026 | Mormon Flat, US | daily high max | 37.8 C (100.0 F) | 4.5 C (8.1 F) | 40 years | 31 of 100 (Routine) |
| 27 March 2026 | Mormon Flat, US | daily high min | 19.4 C (66.9 F) | 2.2 C (4.0 F) | 37 years | 26 of 100 (Routine) |
| 26 March 2026 | Mormon Flat, US | daily high min | 18.3 C (64.9 F) | 2.2 C (4.0 F) | 72 years | 36 of 100 (Notable) |
| 25 March 2026 | Mormon Flat, US | daily high min | 17.8 C (64.0 F) | 2.2 C (4.0 F) | 97 years | 44 of 100 (Notable) |
| 25 March 2026 | Mormon Flat, US | daily high max | 35.0 C (95.0 F) | 1.1 C (2.0 F) | 0 years | 12 of 100 (Routine) |
| 24 March 2026 | Mormon Flat, US | daily high max | 36.7 C (98.1 F) | 4.5 C (8.1 F) | 36 years | 29 of 100 (Routine) |
| 24 March 2026 | Mormon Flat, US | daily high min | 19.4 C (66.9 F) | 1.1 C (2.0 F) | 17 years | 17 of 100 (Routine) |
| 23 March 2026 | Mormon Flat, US | daily high max | 38.9 C (102.0 F) | 6.1 C (11.0 F) | 24 years | 29 of 100 (Routine) |
| 23 March 2026 | Mormon Flat, US | daily high min (Tie) | 18.3 C (64.9 F) | tie | 8 years | 3 of 100 (Routine) |
| 21 March 2026 | Mormon Flat, US | daily high min | 21.1 C (70.0 F) | 3.3 C (5.9 F) | 87 years | 44 of 100 (Notable) |
Climate Trend
48 complete years, 1929 to 1992| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1929 | 21.8 C | -0.23 C |
| 1931 | 22.6 C | +0.56 C |
| 1932 | 22.1 C | +0.07 C |
| 1933 | 22.7 C | +0.66 C |
| 1934 | 24.5 C | +2.50 C |
| 1935 | 22.3 C | +0.30 C |
| 1936 | 22.9 C | +0.87 C |
| 1938 | 22.4 C | +0.41 C |
| 1939 | 22.5 C | +0.52 C |
| 1940 | 23.0 C | +1.04 C |
| 1941 | 20.7 C | -1.27 C |
| 1943 | 23.0 C | +0.99 C |
| 1944 | 21.2 C | -0.79 C |
| 1946 | 21.7 C | -0.33 C |
| 1947 | 21.8 C | -0.19 C |
| 1948 | 21.3 C | -0.67 C |
| 1949 | 21.5 C | -0.46 C |
| 1951 | 21.9 C | -0.12 C |
| 1952 | 21.9 C | -0.07 C |
| 1954 | 23.1 C | +1.13 C |
| 1955 | 21.5 C | -0.51 C |
| 1956 | 22.6 C | +0.59 C |
| 1957 | 22.0 C | +0.01 C |
| 1958 | 22.8 C | +0.78 C |
| 1959 | 22.7 C | +0.70 C |
| 1960 | 22.2 C | +0.19 C |
| 1961 | 22.3 C | +0.29 C |
| 1962 | 22.5 C | +0.54 C |
| 1963 | 22.3 C | +0.27 C |
| 1964 | 20.9 C | -1.07 C |
| 1965 | 21.4 C | -0.57 C |
| 1966 | 22.0 C | -0.01 C |
| 1967 | 21.7 C | -0.31 C |
| 1971 | 21.0 C | -0.96 C |
| 1973 | 21.0 C | -0.99 C |
| 1974 | 21.4 C | -0.56 C |
| 1975 | 20.7 C | -1.32 C |
| 1977 | 22.1 C | +0.11 C |
| 1978 | 21.3 C | -0.68 C |
| 1981 | 22.5 C | +0.48 C |
| 1983 | 20.8 C | -1.17 C |
| 1984 | 21.3 C | -0.67 C |
| 1986 | 22.1 C | +0.11 C |
| 1987 | 21.9 C | -0.07 C |
| 1988 | 22.4 C | +0.40 C |
| 1990 | 21.9 C | -0.13 C |
| 1991 | 21.7 C | -0.33 C |
| 1992 | 21.8 C | -0.23 C |
The annual mean temperature here has fallen by 0.15 C (0.04 to 0.26) per decade over 1929 to 1992. In Fahrenheit: 0.3 F (0.1 to 0.5) per decade. The slope is a straight line fitted to 48 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | -0.15 C (-0.26 to -0.04) per decade | -0.3 F (-0.5 to -0.1) per decade | 1929 to 1992 | 48 | Fall |
| Mean daily maximum | -0.08 C (-0.19 to 0.03) per decade | -0.1 F (-0.3 to 0.1) per decade | 1929 to 1992 | 48 | Not clearly different from zero |
| Mean daily minimum | -0.2 C (-0.4 to -0.1) per decade | -0.4 F (-0.6 to -0.1) per decade | 1929 to 1992 | 48 | 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
1923 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 48.9 C (120.0 F) | 1970 | 45.0 C (113.0 F) | 104 |
| Coldest night (TNn) | -8.3 C (17.1 F) | 2004 | -1.1 C (30.0 F) | 104 |
| Wettest day (Rx1day) | 114.0 mm (4.5 in) | 1930 | 39.9 mm (1.6 in) | 104 |
| Wettest five days (Rx5day) | 150.7 mm (5.9 in) | 1993 | 54.9 mm (2.2 in) | 104 |
| Longest dry spell (CDD) | 147 days | 1943 | 57 days | 104 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1923 | 39.4 C (102.9 F) |
| 1924 | 32.2 C (90.0 F) |
| 1925 | 47.2 C (117.0 F) |
| 1926 | 45.0 C (113.0 F) |
| 1927 | 45.0 C (113.0 F) |
| 1928 | 45.0 C (113.0 F) |
| 1929 | 47.8 C (118.0 F) |
| 1930 | 43.9 C (111.0 F) |
| 1931 | 45.0 C (113.0 F) |
| 1932 | 45.0 C (113.0 F) |
| 1933 | 46.7 C (116.1 F) |
| 1934 | 47.8 C (118.0 F) |
| 1935 | 47.2 C (117.0 F) |
| 1936 | 47.2 C (117.0 F) |
| 1937 | 46.1 C (115.0 F) |
| 1938 | 45.0 C (113.0 F) |
| 1939 | 46.1 C (115.0 F) |
| 1940 | 46.7 C (116.1 F) |
| 1941 | 43.3 C (109.9 F) |
| 1942 | 45.6 C (114.1 F) |
| 1943 | 47.2 C (117.0 F) |
| 1944 | 46.7 C (116.1 F) |
| 1945 | 45.6 C (114.1 F) |
| 1946 | 44.4 C (111.9 F) |
| 1947 | 45.6 C (114.1 F) |
| 1948 | 44.4 C (111.9 F) |
| 1949 | 43.9 C (111.0 F) |
| 1950 | 46.1 C (115.0 F) |
| 1951 | 43.9 C (111.0 F) |
| 1952 | 43.3 C (109.9 F) |
| 1953 | 45.0 C (113.0 F) |
| 1954 | 44.4 C (111.9 F) |
| 1955 | 46.1 C (115.0 F) |
| 1956 | 45.0 C (113.0 F) |
| 1957 | 46.1 C (115.0 F) |
| 1958 | 47.8 C (118.0 F) |
| 1959 | 45.0 C (113.0 F) |
| 1960 | 45.6 C (114.1 F) |
| 1961 | 45.0 C (113.0 F) |
| 1962 | 45.0 C (113.0 F) |
| 1963 | 43.3 C (109.9 F) |
| 1964 | 46.7 C (116.1 F) |
| 1965 | 44.4 C (111.9 F) |
| 1966 | 43.3 C (109.9 F) |
| 1967 | 43.9 C (111.0 F) |
| 1968 | 46.1 C (115.0 F) |
| 1969 | 46.1 C (115.0 F) |
| 1970 | 48.9 C (120.0 F) |
| 1971 | 46.1 C (115.0 F) |
| 1972 | 45.6 C (114.1 F) |
| 1973 | 46.1 C (115.0 F) |
| 1974 | 47.2 C (117.0 F) |
| 1975 | 45.0 C (113.0 F) |
| 1976 | 44.4 C (111.9 F) |
| 1977 | 43.9 C (111.0 F) |
| 1978 | 45.6 C (114.1 F) |
| 1979 | 43.3 C (109.9 F) |
| 1980 | 44.4 C (111.9 F) |
| 1981 | 44.4 C (111.9 F) |
| 1982 | 43.3 C (109.9 F) |
| 1983 | 45.6 C (114.1 F) |
| 1984 | 43.3 C (109.9 F) |
| 1985 | 45.6 C (114.1 F) |
| 1986 | 44.4 C (111.9 F) |
| 1987 | 44.4 C (111.9 F) |
| 1988 | 46.1 C (115.0 F) |
| 1989 | 45.0 C (113.0 F) |
| 1990 | 48.3 C (118.9 F) |
| 1991 | 43.9 C (111.0 F) |
| 1992 | 42.8 C (109.0 F) |
| 1993 | 45.0 C (113.0 F) |
| 1994 | 46.7 C (116.1 F) |
| 1995 | 47.2 C (117.0 F) |
| 1996 | 45.0 C (113.0 F) |
| 1997 | 44.4 C (111.9 F) |
| 1998 | 41.7 C (107.1 F) |
| 1999 | 43.3 C (109.9 F) |
| 2000 | 45.0 C (113.0 F) |
| 2001 | 44.4 C (111.9 F) |
| 2002 | 44.4 C (111.9 F) |
| 2003 | 46.1 C (115.0 F) |
| 2004 | 44.4 C (111.9 F) |
| 2005 | 46.1 C (115.0 F) |
| 2006 | 47.2 C (117.0 F) |
| 2007 | 45.0 C (113.0 F) |
| 2008 | 44.4 C (111.9 F) |
| 2009 | 45.0 C (113.0 F) |
| 2010 | 43.9 C (111.0 F) |
| 2011 | 46.1 C (115.0 F) |
| 2012 | 45.6 C (114.1 F) |
| 2013 | 43.9 C (111.0 F) |
| 2014 | 45.0 C (113.0 F) |
| 2015 | 44.4 C (111.9 F) |
| 2016 | 47.2 C (117.0 F) |
| 2017 | 47.8 C (118.0 F) |
| 2018 | 46.1 C (115.0 F) |
| 2019 | 44.4 C (111.9 F) |
| 2020 | 46.1 C (115.0 F) |
| 2021 | 46.7 C (116.1 F) |
| 2022 | 44.4 C (111.9 F) |
| 2023 | 46.1 C (115.0 F) |
| 2024 | 45.6 C (114.1 F) |
| 2025 | 46.7 C (116.1 F) |
| 2026 | 46.7 C (116.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1923 | 0.6 C (33.1 F) |
| 1924 | -1.7 C (28.9 F) |
| 1925 | 0.6 C (33.1 F) |
| 1926 | -2.2 C (28.0 F) |
| 1927 | 0.0 C (32.0 F) |
| 1928 | -0.6 C (30.9 F) |
| 1929 | -1.7 C (28.9 F) |
| 1930 | 0.6 C (33.1 F) |
| 1931 | -1.1 C (30.0 F) |
| 1932 | -1.7 C (28.9 F) |
| 1933 | -5.6 C (21.9 F) |
| 1934 | 1.1 C (34.0 F) |
| 1935 | -2.8 C (27.0 F) |
| 1936 | -1.1 C (30.0 F) |
| 1937 | -6.7 C (19.9 F) |
| 1938 | 1.7 C (35.1 F) |
| 1939 | -1.1 C (30.0 F) |
| 1940 | 1.7 C (35.1 F) |
| 1941 | -1.7 C (28.9 F) |
| 1942 | -2.2 C (28.0 F) |
| 1943 | 0.0 C (32.0 F) |
| 1944 | 0.0 C (32.0 F) |
| 1945 | -1.7 C (28.9 F) |
| 1946 | -2.8 C (27.0 F) |
| 1947 | -3.3 C (26.1 F) |
| 1948 | -3.9 C (25.0 F) |
| 1949 | -5.6 C (21.9 F) |
| 1950 | -4.4 C (24.1 F) |
| 1951 | -1.7 C (28.9 F) |
| 1952 | -3.3 C (26.1 F) |
| 1953 | -1.7 C (28.9 F) |
| 1954 | -2.2 C (28.0 F) |
| 1955 | -2.2 C (28.0 F) |
| 1956 | -1.7 C (28.9 F) |
| 1957 | 1.7 C (35.1 F) |
| 1958 | 0.0 C (32.0 F) |
| 1959 | 0.0 C (32.0 F) |
| 1960 | -1.7 C (28.9 F) |
| 1961 | 0.0 C (32.0 F) |
| 1962 | -1.1 C (30.0 F) |
| 1963 | -4.4 C (24.1 F) |
| 1964 | -3.3 C (26.1 F) |
| 1965 | -1.1 C (30.0 F) |
| 1966 | -1.1 C (30.0 F) |
| 1967 | -2.2 C (28.0 F) |
| 1968 | -2.2 C (28.0 F) |
| 1969 | -1.1 C (30.0 F) |
| 1970 | -1.1 C (30.0 F) |
| 1971 | -6.7 C (19.9 F) |
| 1972 | -1.7 C (28.9 F) |
| 1973 | -1.1 C (30.0 F) |
| 1974 | -4.4 C (24.1 F) |
| 1975 | -2.2 C (28.0 F) |
| 1976 | -3.9 C (25.0 F) |
| 1977 | -1.1 C (30.0 F) |
| 1978 | -6.7 C (19.9 F) |
| 1979 | -1.7 C (28.9 F) |
| 1980 | 1.7 C (35.1 F) |
| 1981 | 0.6 C (33.1 F) |
| 1982 | 0.0 C (32.0 F) |
| 1983 | 0.0 C (32.0 F) |
| 1984 | -1.7 C (28.9 F) |
| 1985 | -1.1 C (30.0 F) |
| 1986 | 0.0 C (32.0 F) |
| 1987 | -3.3 C (26.1 F) |
| 1988 | -2.8 C (27.0 F) |
| 1989 | -1.7 C (28.9 F) |
| 1990 | -2.8 C (27.0 F) |
| 1991 | -0.6 C (30.9 F) |
| 1992 | 0.0 C (32.0 F) |
| 1993 | -6.1 C (21.0 F) |
| 1994 | -1.1 C (30.0 F) |
| 1995 | -0.6 C (30.9 F) |
| 1996 | 1.7 C (35.1 F) |
| 1997 | -1.1 C (30.0 F) |
| 1998 | 2.8 C (37.0 F) |
| 1999 | 0.0 C (32.0 F) |
| 2000 | -3.3 C (26.1 F) |
| 2001 | -2.8 C (27.0 F) |
| 2002 | -1.1 C (30.0 F) |
| 2003 | -7.8 C (18.0 F) |
| 2004 | -8.3 C (17.1 F) |
| 2005 | 0.0 C (32.0 F) |
| 2006 | 0.6 C (33.1 F) |
| 2007 | -3.9 C (25.0 F) |
| 2008 | -0.6 C (30.9 F) |
| 2009 | 0.0 C (32.0 F) |
| 2010 | 0.6 C (33.1 F) |
| 2011 | -3.3 C (26.1 F) |
| 2012 | 1.7 C (35.1 F) |
| 2013 | -3.9 C (25.0 F) |
| 2014 | 0.6 C (33.1 F) |
| 2015 | -1.1 C (30.0 F) |
| 2016 | 2.2 C (36.0 F) |
| 2017 | 0.0 C (32.0 F) |
| 2018 | 1.1 C (34.0 F) |
| 2019 | -0.6 C (30.9 F) |
| 2020 | -1.1 C (30.0 F) |
| 2021 | -1.1 C (30.0 F) |
| 2022 | -1.7 C (28.9 F) |
| 2023 | -0.6 C (30.9 F) |
| 2024 | -1.7 C (28.9 F) |
| 2025 | 1.7 C (35.1 F) |
| 2026 | 3.9 C (39.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1923 | 22.4 mm (0.9 in) |
| 1924 | 19.8 mm (0.8 in) |
| 1925 | 46.2 mm (1.8 in) |
| 1926 | 53.1 mm (2.1 in) |
| 1927 | 76.2 mm (3.0 in) |
| 1928 | 50.8 mm (2.0 in) |
| 1929 | 40.6 mm (1.6 in) |
| 1930 | 114.0 mm (4.5 in) |
| 1931 | 59.7 mm (2.4 in) |
| 1932 | 19.8 mm (0.8 in) |
| 1933 | 37.8 mm (1.5 in) |
| 1934 | 36.8 mm (1.4 in) |
| 1935 | 48.5 mm (1.9 in) |
| 1936 | 31.8 mm (1.3 in) |
| 1937 | 30.5 mm (1.2 in) |
| 1938 | 23.1 mm (0.9 in) |
| 1939 | 50.8 mm (2.0 in) |
| 1940 | 34.3 mm (1.4 in) |
| 1941 | 57.2 mm (2.3 in) |
| 1942 | 41.7 mm (1.6 in) |
| 1943 | 52.3 mm (2.1 in) |
| 1944 | 30.5 mm (1.2 in) |
| 1945 | 24.1 mm (0.9 in) |
| 1946 | 55.9 mm (2.2 in) |
| 1947 | 41.7 mm (1.6 in) |
| 1948 | 25.4 mm (1.0 in) |
| 1949 | 50.5 mm (2.0 in) |
| 1950 | 26.9 mm (1.1 in) |
| 1951 | 51.3 mm (2.0 in) |
| 1952 | 35.6 mm (1.4 in) |
| 1953 | 23.9 mm (0.9 in) |
| 1954 | 52.6 mm (2.1 in) |
| 1955 | 43.4 mm (1.7 in) |
| 1956 | 17.5 mm (0.7 in) |
| 1957 | 34.3 mm (1.4 in) |
| 1958 | 32.3 mm (1.3 in) |
| 1959 | 93.5 mm (3.7 in) |
| 1960 | 44.2 mm (1.7 in) |
| 1961 | 35.8 mm (1.4 in) |
| 1962 | 29.2 mm (1.1 in) |
| 1963 | 30.0 mm (1.2 in) |
| 1964 | 37.1 mm (1.5 in) |
| 1965 | 44.7 mm (1.8 in) |
| 1966 | 64.3 mm (2.5 in) |
| 1967 | 50.0 mm (2.0 in) |
| 1968 | 45.7 mm (1.8 in) |
| 1969 | 28.7 mm (1.1 in) |
| 1970 | 106.7 mm (4.2 in) |
| 1971 | 42.4 mm (1.7 in) |
| 1972 | 64.8 mm (2.6 in) |
| 1973 | 22.4 mm (0.9 in) |
| 1974 | 43.9 mm (1.7 in) |
| 1975 | 33.8 mm (1.3 in) |
| 1976 | 23.4 mm (0.9 in) |
| 1977 | 56.4 mm (2.2 in) |
| 1978 | 81.3 mm (3.2 in) |
| 1979 | 36.8 mm (1.4 in) |
| 1980 | 38.1 mm (1.5 in) |
| 1981 | 30.2 mm (1.2 in) |
| 1982 | 43.9 mm (1.7 in) |
| 1983 | 51.6 mm (2.0 in) |
| 1984 | 41.9 mm (1.6 in) |
| 1985 | 37.6 mm (1.5 in) |
| 1986 | 31.8 mm (1.3 in) |
| 1987 | 31.2 mm (1.2 in) |
| 1988 | 37.1 mm (1.5 in) |
| 1989 | 45.2 mm (1.8 in) |
| 1990 | 29.5 mm (1.2 in) |
| 1991 | 35.8 mm (1.4 in) |
| 1992 | 62.2 mm (2.4 in) |
| 1993 | 69.9 mm (2.8 in) |
| 1994 | 24.1 mm (0.9 in) |
| 1995 | 42.2 mm (1.7 in) |
| 1996 | 39.1 mm (1.5 in) |
| 1997 | 37.3 mm (1.5 in) |
| 1998 | 5.3 mm (0.21 in) |
| 1999 | 12.2 mm (0.5 in) |
| 2000 | 47.5 mm (1.9 in) |
| 2001 | 50.3 mm (2.0 in) |
| 2002 | 14.7 mm (0.6 in) |
| 2003 | 31.0 mm (1.2 in) |
| 2004 | 40.9 mm (1.6 in) |
| 2005 | 68.6 mm (2.7 in) |
| 2006 | 53.8 mm (2.1 in) |
| 2007 | 66.0 mm (2.6 in) |
| 2008 | 54.9 mm (2.2 in) |
| 2009 | 26.7 mm (1.1 in) |
| 2010 | 36.3 mm (1.4 in) |
| 2011 | 46.0 mm (1.8 in) |
| 2012 | 32.0 mm (1.3 in) |
| 2013 | 47.0 mm (1.9 in) |
| 2014 | 33.5 mm (1.3 in) |
| 2015 | 18.5 mm (0.7 in) |
| 2016 | 16.5 mm (0.6 in) |
| 2017 | 59.2 mm (2.3 in) |
| 2018 | 36.8 mm (1.4 in) |
| 2019 | 96.0 mm (3.8 in) |
| 2020 | 17.8 mm (0.7 in) |
| 2021 | 25.4 mm (1.0 in) |
| 2022 | 35.8 mm (1.4 in) |
| 2023 | 64.0 mm (2.5 in) |
| 2024 | 43.2 mm (1.7 in) |
| 2025 | 53.3 mm (2.1 in) |
| 2026 | 54.6 mm (2.1 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1923 | 58.1 mm (2.3 in) |
| 1924 | 35.3 mm (1.4 in) |
| 1925 | 53.5 mm (2.1 in) |
| 1926 | 92.4 mm (3.6 in) |
| 1927 | 79.2 mm (3.1 in) |
| 1928 | 79.1 mm (3.1 in) |
| 1929 | 44.4 mm (1.7 in) |
| 1930 | 117.3 mm (4.6 in) |
| 1931 | 96.8 mm (3.8 in) |
| 1932 | 58.7 mm (2.3 in) |
| 1933 | 55.1 mm (2.2 in) |
| 1934 | 41.6 mm (1.6 in) |
| 1935 | 61.0 mm (2.4 in) |
| 1936 | 64.8 mm (2.6 in) |
| 1937 | 50.9 mm (2.0 in) |
| 1938 | 47.9 mm (1.9 in) |
| 1939 | 61.7 mm (2.4 in) |
| 1940 | 37.9 mm (1.5 in) |
| 1941 | 83.0 mm (3.3 in) |
| 1942 | 43.2 mm (1.7 in) |
| 1943 | 86.6 mm (3.4 in) |
| 1944 | 80.0 mm (3.1 in) |
| 1945 | 53.5 mm (2.1 in) |
| 1946 | 124.5 mm (4.9 in) |
| 1947 | 42.9 mm (1.7 in) |
| 1948 | 34.2 mm (1.3 in) |
| 1949 | 50.5 mm (2.0 in) |
| 1950 | 39.7 mm (1.6 in) |
| 1951 | 108.2 mm (4.3 in) |
| 1952 | 45.0 mm (1.8 in) |
| 1953 | 44.2 mm (1.7 in) |
| 1954 | 69.9 mm (2.8 in) |
| 1955 | 100.1 mm (3.9 in) |
| 1956 | 31.2 mm (1.2 in) |
| 1957 | 58.4 mm (2.3 in) |
| 1958 | 42.0 mm (1.7 in) |
| 1959 | 115.9 mm (4.6 in) |
| 1960 | 63.5 mm (2.5 in) |
| 1961 | 48.8 mm (1.9 in) |
| 1962 | 50.5 mm (2.0 in) |
| 1963 | 58.4 mm (2.3 in) |
| 1964 | 50.6 mm (2.0 in) |
| 1965 | 66.6 mm (2.6 in) |
| 1966 | 83.3 mm (3.3 in) |
| 1967 | 109.3 mm (4.3 in) |
| 1968 | 46.8 mm (1.8 in) |
| 1969 | 40.6 mm (1.6 in) |
| 1970 | 114.8 mm (4.5 in) |
| 1971 | 77.9 mm (3.1 in) |
| 1972 | 128.3 mm (5.1 in) |
| 1973 | 41.4 mm (1.6 in) |
| 1974 | 66.1 mm (2.6 in) |
| 1975 | 40.9 mm (1.6 in) |
| 1976 | 43.2 mm (1.7 in) |
| 1977 | 69.6 mm (2.7 in) |
| 1978 | 112.8 mm (4.4 in) |
| 1979 | 64.0 mm (2.5 in) |
| 1980 | 88.9 mm (3.5 in) |
| 1981 | 58.4 mm (2.3 in) |
| 1982 | 54.3 mm (2.1 in) |
| 1983 | 108.7 mm (4.3 in) |
| 1984 | 69.9 mm (2.8 in) |
| 1985 | 52.3 mm (2.1 in) |
| 1986 | 78.8 mm (3.1 in) |
| 1987 | 52.9 mm (2.1 in) |
| 1988 | 41.2 mm (1.6 in) |
| 1989 | 79.5 mm (3.1 in) |
| 1990 | 58.9 mm (2.3 in) |
| 1991 | 80.5 mm (3.2 in) |
| 1992 | 74.9 mm (2.9 in) |
| 1993 | 150.7 mm (5.9 in) |
| 1994 | 41.9 mm (1.6 in) |
| 1995 | 47.8 mm (1.9 in) |
| 1996 | 29.0 mm (1.1 in) |
| 1997 | 70.0 mm (2.8 in) |
| 1998 | 7.3 mm (0.29 in) |
| 1999 | 13.2 mm (0.5 in) |
| 2000 | 56.1 mm (2.2 in) |
| 2001 | 32.5 mm (1.3 in) |
| 2002 | 14.7 mm (0.6 in) |
| 2003 | 41.7 mm (1.6 in) |
| 2004 | 57.9 mm (2.3 in) |
| 2005 | 77.5 mm (3.1 in) |
| 2006 | 54.6 mm (2.1 in) |
| 2007 | 103.2 mm (4.1 in) |
| 2008 | 60.3 mm (2.4 in) |
| 2009 | 36.6 mm (1.4 in) |
| 2010 | 115.6 mm (4.6 in) |
| 2011 | 23.4 mm (0.9 in) |
| 2012 | 43.7 mm (1.7 in) |
| 2013 | 53.6 mm (2.1 in) |
| 2014 | 45.0 mm (1.8 in) |
| 2015 | 19.8 mm (0.8 in) |
| 2016 | 20.3 mm (0.8 in) |
| 2017 | 26.7 mm (1.1 in) |
| 2018 | 58.2 mm (2.3 in) |
| 2019 | 104.1 mm (4.1 in) |
| 2020 | 39.4 mm (1.6 in) |
| 2021 | 49.2 mm (1.9 in) |
| 2022 | 22.9 mm (0.9 in) |
| 2023 | 64.0 mm (2.5 in) |
| 2024 | 51.6 mm (2.0 in) |
| 2025 | 2.5 mm (0.10 in) |
| 2026 | 18.1 mm (0.7 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1923 | 42 days |
| 1924 | 74 days |
| 1925 | 37 days |
| 1926 | 52 days |
| 1927 | 37 days |
| 1928 | 60 days |
| 1929 | 84 days |
| 1930 | 39 days |
| 1931 | 43 days |
| 1932 | 59 days |
| 1933 | 53 days |
| 1934 | 53 days |
| 1935 | 60 days |
| 1936 | 104 days |
| 1937 | 61 days |
| 1938 | 90 days |
| 1939 | 48 days |
| 1940 | 56 days |
| 1941 | 27 days |
| 1942 | 75 days |
| 1943 | 147 days |
| 1944 | 33 days |
| 1945 | 57 days |
| 1946 | 111 days |
| 1947 | 70 days |
| 1948 | 78 days |
| 1949 | 52 days |
| 1950 | 56 days |
| 1951 | 64 days |
| 1952 | 46 days |
| 1953 | 81 days |
| 1954 | 69 days |
| 1955 | 113 days |
| 1956 | 64 days |
| 1957 | 46 days |
| 1958 | 65 days |
| 1959 | 66 days |
| 1960 | 73 days |
| 1961 | 94 days |
| 1962 | 109 days |
| 1963 | 83 days |
| 1964 | 74 days |
| 1965 | 37 days |
| 1966 | 84 days |
| 1967 | 48 days |
| 1968 | 77 days |
| 1969 | 72 days |
| 1970 | 90 days |
| 1971 | 108 days |
| 1972 | 60 days |
| 1973 | 96 days |
| 1974 | 108 days |
| 1975 | 81 days |
| 1976 | 40 days |
| 1977 | 61 days |
| 1978 | 53 days |
| 1979 | 64 days |
| 1980 | 86 days |
| 1981 | 54 days |
| 1982 | 41 days |
| 1983 | 47 days |
| 1984 | 83 days |
| 1985 | 75 days |
| 1986 | 106 days |
| 1987 | 49 days |
| 1988 | 57 days |
| 1989 | 54 days |
| 1990 | 41 days |
| 1991 | 122 days |
| 1992 | 36 days |
| 1993 | 55 days |
| 1994 | 42 days |
| 1995 | 98 days |
| 1996 | 45 days |
| 1997 | 33 days |
| 1998 | 46 days |
| 1999 | 99 days |
| 2000 | 83 days |
| 2001 | 51 days |
| 2002 | 41 days |
| 2003 | 93 days |
| 2004 | 68 days |
| 2005 | 73 days |
| 2006 | 69 days |
| 2007 | 56 days |
| 2008 | 57 days |
| 2009 | 81 days |
| 2010 | 77 days |
| 2011 | 6 days |
| 2012 | 5 days |
| 2013 | 5 days |
| 2014 | 9 days |
| 2015 | 7 days |
| 2016 | 42 days |
| 2017 | 36 days |
| 2018 | 6 days |
| 2019 | 23 days |
| 2020 | 6 days |
| 2021 | 5 days |
| 2022 | 5 days |
| 2023 | 15 days |
| 2024 | 12 days |
| 2025 | 15 days |
| 2026 | 12 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
24 years with a frostAcross 24 years with a frost, the median last spring frost at Mormon Flat falls on 22 February and the median first autumn frost on 15 December, which leaves a median of 299 days between them.
| Measure | Median, all years | Earliest period | Recent period (1932 to 1991) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 22 February | n/a | 22 February | n/a | n/a |
| First autumn frost | 15 December | n/a | 15 December | n/a | n/a |
| Growing days | 299 days | n/a | 299 days | n/a | n/a |
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
71 years, 1926 to 2009A day with at least 39.7 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 111.1 mm (4.4 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 39.7 mm (1.6 in) | |
| 5 years | 55.2 mm (2.2 in) | |
| 10 years | 66.7 mm (2.6 in) | |
| 25 years | 83.0 mm (3.3 in) | |
| 50 years | 96.5 mm (3.8 in) | |
| 100 years | 111.1 mm (4.4 in) | Longer than the 71 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, 71 years of values from 1926 to 2009.
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: 114.0 mm (4.5 in) in 1930; 106.7 mm (4.2 in) in 1970; 93.5 mm (3.7 in) in 1959.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Mormon Flat, at 1971. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1971 ran 0.4 C (0.6 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1971 | -0.4 | -0.6 | likely | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
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).