San Simon Weather Records (USC00027560)
Record envelope, standing records and threshold days for San Simon (USC00027560), Arizona, United States, with 129 years of record.
Key Facts for San Simon
- San Simon (USC00027560) is a weather station in Arizona, United States at 32.29 latitude and -109.23 longitude, 1,091 m (3,579 ft) above sea level.
- The station reports from 1898 to 2026, 129 years of record.
- 1,464 records set at San Simon still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- San Simon set a daily record precipitation of 35.3 mm (1.4 in) on 29 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, 32.29 latitude, -109.23 longitude.
- Elevation: 1,091 m (3,579 ft).
- Period of record: 1898 to 2026, 129 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
31 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) | -20.6 C (-5.1 F) | 23.9 C (75.0 F) | -8.3 C (17.1 F) |
| Feb | 31.1 C (88.0 F) | -17.8 C (0.0 F) | 30.6 C (87.1 F) | -6.1 C (21.0 F) |
| Mar | 36.7 C (98.1 F) | -12.8 C (9.0 F) | 36.7 C (98.1 F) | -2.8 C (27.0 F) |
| Apr | 37.2 C (99.0 F) | -8.3 C (17.1 F) | 34.4 C (93.9 F) | -1.1 C (30.0 F) |
| May | 42.2 C (108.0 F) | -4.4 C (24.1 F) | 37.2 C (99.0 F) | 1.7 C (35.1 F) |
| Jun | 45.6 C (114.1 F) | 0.0 C (32.0 F) | 41.1 C (106.0 F) | 10.6 C (51.1 F) |
| Jul | 43.9 C (111.0 F) | 7.2 C (45.0 F) | 42.2 C (108.0 F) | 11.1 C (52.0 F) |
| Aug | 42.8 C (109.0 F) | 8.3 C (46.9 F) | 42.2 C (108.0 F) | 17.2 C (63.0 F) |
| Sep | 40.6 C (105.1 F) | 2.2 C (36.0 F) | 36.7 C (98.1 F) | 11.7 C (53.1 F) |
| Oct | 37.2 C (99.0 F) | -7.8 C (18.0 F) | 32.2 C (90.0 F) | 10.0 C (50.0 F) |
| Nov | 31.1 C (88.0 F) | -12.2 C (10.0 F) | n/a | n/a |
| Dec | 26.7 C (80.1 F) | -15.0 C (5.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1903 | 19 |
| 1904 | 12 |
| 1905 | 12 |
| 1906 | 45 |
| 1907 | 63 |
| 1908 | 25 |
| 1913 | 43 |
| 1914 | 12 |
| 1915 | 32 |
| 1916 | 11 |
| 1939 | 2 |
| 1940 | 13 |
| 1941 | 8 |
| 1942 | 10 |
| 1943 | 22 |
| 1944 | 8 |
| 1945 | 20 |
| 1946 | 17 |
| 1947 | 28 |
| 1948 | 17 |
| 1949 | 17 |
| 1950 | 25 |
| 1951 | 34 |
| 1952 | 11 |
| 1953 | 27 |
| 1954 | 14 |
| 1955 | 21 |
| 1956 | 27 |
| 1957 | 22 |
| 1958 | 20 |
| 1959 | 16 |
| 1960 | 17 |
| 1961 | 11 |
| 1962 | 19 |
| 1987 | 16 |
| 1988 | 17 |
| 1989 | 17 |
| 1990 | 23 |
| 1991 | 21 |
| 1992 | 14 |
| 1993 | 9 |
| 1994 | 18 |
| 1995 | 20 |
| 1996 | 19 |
| 1997 | 12 |
| 1998 | 16 |
| 1999 | 15 |
| 2000 | 17 |
| 2001 | 9 |
| 2002 | 16 |
| 2003 | 22 |
| 2004 | 15 |
| 2005 | 22 |
| 2006 | 15 |
| 2007 | 16 |
| 2008 | 20 |
| 2009 | 15 |
| 2010 | 17 |
| 2011 | 21 |
| 2012 | 4 |
| 2013 | 11 |
| 2014 | 15 |
| 2015 | 11 |
| 2016 | 18 |
| 2017 | 28 |
| 2018 | 44 |
| 2019 | 26 |
| 2020 | 26 |
| 2021 | 20 |
| 2022 | 18 |
| 2023 | 32 |
| 2024 | 17 |
| 2025 | 45 |
| 2026 | 27 |
All-Time Record Progression
6 new records| Date | Kind | Detail |
|---|---|---|
| 1990-06-25 | Record high maximum temperature | Record high maximum temperature 43.9 C (111.0 F) |
| 1990-06-26 | Record high maximum temperature | Record high maximum temperature 44.4 C (111.9 F) |
| 1994-06-25 | Record high maximum temperature | Record high maximum temperature 45.0 C (113.0 F) |
| 1994-06-26 | Record high maximum temperature | Record high maximum temperature 45.6 C (114.1 F) |
| 2007-01-22 | Record daily snowfall | Record daily snowfall 22.9 cm (9.0 in) |
| 2007-01-22 | Record snow depth | Record snow depth 20.3 cm (8.0 in) |
Wettest Day of Each Month
Mar: 101.6 mm (4.0 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 66.8 mm (2.6 in) | 19 January 1916 |
| Feb | 27.9 mm (1.1 in) | 17 February 2012 |
| Mar | 101.6 mm (4.0 in) | 1 March 1905 |
| Apr | 25.4 mm (1.0 in) | 23 April 1908 |
| May | 22.4 mm (0.9 in) | 6 May 1957 |
| Jun | 41.9 mm (1.6 in) | 2 June 1952 |
| Jul | 78.7 mm (3.1 in) | 30 July 1994 |
| Aug | 63.5 mm (2.5 in) | 22 August 1961 |
| Sep | 43.7 mm (1.7 in) | 21 September 1997 |
| Oct | 49.5 mm (1.9 in) | 9 October 1945 |
| Nov | 41.4 mm (1.6 in) | 28 November 2019 |
| Dec | 46.2 mm (1.8 in) | 18 December 1987 |
Period of Record Coverage
1903 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1903 | 295 | 81% | No |
| 1904 | 58 | 16% | No |
| 1905 | 301 | 82% | No |
| 1906 | 355 | 97% | Yes |
| 1907 | 359 | 98% | Yes |
| 1908 | 302 | 83% | No |
| 1913 | 344 | 94% | Yes |
| 1914 | 213 | 58% | No |
| 1915 | 355 | 97% | Yes |
| 1916 | 121 | 33% | No |
| 1939 | 37 | 10% | No |
| 1940 | 365 | 100% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 362 | 99% | Yes |
| 1943 | 333 | 91% | Yes |
| 1944 | 216 | 59% | No |
| 1945 | 301 | 82% | No |
| 1946 | 323 | 88% | No |
| 1947 | 354 | 97% | Yes |
| 1948 | 171 | 47% | No |
| 1949 | 326 | 89% | No |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 343 | 94% | Yes |
| 1953 | 363 | 99% | Yes |
| 1954 | 363 | 99% | Yes |
| 1955 | 364 | 100% | Yes |
| 1956 | 365 | 100% | Yes |
| 1957 | 363 | 99% | Yes |
| 1958 | 362 | 99% | Yes |
| 1959 | 363 | 99% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 363 | 99% | Yes |
| 1962 | 198 | 54% | No |
| 1987 | 359 | 98% | Yes |
| 1988 | 364 | 99% | Yes |
| 1989 | 363 | 99% | Yes |
| 1990 | 364 | 100% | Yes |
| 1991 | 351 | 96% | Yes |
| 1992 | 361 | 99% | Yes |
| 1993 | 364 | 100% | Yes |
| 1994 | 364 | 100% | Yes |
| 1995 | 360 | 99% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 365 | 100% | Yes |
| 1998 | 363 | 99% | Yes |
| 1999 | 345 | 95% | Yes |
| 2000 | 330 | 90% | Yes |
| 2001 | 359 | 98% | Yes |
| 2002 | 356 | 98% | Yes |
| 2003 | 356 | 98% | Yes |
| 2004 | 356 | 97% | Yes |
| 2005 | 363 | 99% | Yes |
| 2006 | 333 | 91% | Yes |
| 2007 | 331 | 91% | Yes |
| 2008 | 334 | 91% | Yes |
| 2009 | 325 | 89% | No |
| 2010 | 340 | 93% | Yes |
| 2011 | 322 | 88% | No |
| 2012 | 338 | 92% | Yes |
| 2013 | 283 | 78% | No |
| 2014 | 335 | 92% | Yes |
| 2015 | 321 | 88% | No |
| 2016 | 329 | 90% | No |
| 2017 | 319 | 87% | No |
| 2018 | 346 | 95% | Yes |
| 2019 | 345 | 95% | Yes |
| 2020 | 321 | 88% | No |
| 2021 | 338 | 93% | Yes |
| 2022 | 364 | 100% | Yes |
| 2023 | 349 | 96% | Yes |
| 2024 | 365 | 100% | Yes |
| 2025 | 348 | 95% | Yes |
| 2026 | 274 | 75% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 29 September 2026 | San Simon, US | daily rain (Provisional) | 35.3 mm (1.4 in) | 22.1 mm (0.9 in) | 84 years | 63 of 100 (Major) |
| 28 September 2026 | San Simon, US | daily high min (Provisional) | 20.0 C (68.0 F) | 2.2 C (4.0 F) | 1 year | 16 of 100 (Routine) |
| 13 September 2026 | San Simon, US | monthly high min (Tie, Provisional) | 22.8 C (73.0 F) | tie | 119 years | 12 of 100 (Routine) |
| 12 September 2026 | San Simon, US | daily high min (Tie, Provisional) | 21.1 C (70.0 F) | tie | 16 years | 3 of 100 (Routine) |
| 11 September 2026 | San Simon, US | monthly high min (Tie, Provisional) | 22.8 C (73.0 F) | tie | 119 years | 12 of 100 (Routine) |
| 9 September 2026 | San Simon, US | daily high min (Tie, Provisional) | 20.0 C (68.0 F) | tie | 8 years | 3 of 100 (Routine) |
| 8 September 2026 | San Simon, US | monthly high min (Tie, Provisional) | 22.8 C (73.0 F) | tie | 119 years | 12 of 100 (Routine) |
| 7 September 2026 | San Simon, US | daily high min (Provisional) | 22.2 C (72.0 F) | 0.5 C (0.9 F) | 80 years | 35 of 100 (Notable) |
| 6 September 2026 | San Simon, US | daily high min (Provisional) | 22.2 C (72.0 F) | 2.2 C (4.0 F) | 65 years | 35 of 100 (Notable) |
| 4 September 2026 | San Simon, US | monthly high min (Tie, Provisional) | 22.8 C (73.0 F) | tie | 119 years | 12 of 100 (Routine) |
| 3 September 2026 | San Simon, US | daily high min (Tie, Provisional) | 22.2 C (72.0 F) | tie | 28 years | 4 of 100 (Routine) |
| 29 August 2026 | San Simon, US | daily high max (Provisional) | 39.4 C (102.9 F) | 0.5 C (0.9 F) | 76 years | 34 of 100 (Routine) |
| 28 August 2026 | San Simon, US | daily high max (Provisional) | 41.1 C (106.0 F) | 1.1 C (2.0 F) | 5 years | 14 of 100 (Routine) |
| 27 August 2026 | San Simon, US | daily high max (Provisional) | 41.1 C (106.0 F) | 0.5 C (0.9 F) | 7 years | 13 of 100 (Routine) |
| 26 August 2026 | San Simon, US | daily high max (Provisional) | 41.1 C (106.0 F) | 1.7 C (3.1 F) | 15 years | 19 of 100 (Routine) |
| 25 August 2026 | San Simon, US | daily high max (Provisional) | 40.0 C (104.0 F) | 0.6 C (1.1 F) | 24 years | 19 of 100 (Routine) |
| 24 August 2026 | San Simon, US | daily high max (Provisional) | 40.0 C (104.0 F) | 0.6 C (1.1 F) | 24 years | 19 of 100 (Routine) |
| 23 August 2026 | San Simon, US | daily high max (Provisional) | 38.9 C (102.0 F) | 0.6 C (1.1 F) | 15 years | 16 of 100 (Routine) |
| 22 August 2026 | San Simon, US | daily high max (Provisional) | 38.9 C (102.0 F) | 0.6 C (1.1 F) | 123 years | 42 of 100 (Notable) |
| 21 August 2026 | San Simon, US | daily high max (Tie, Provisional) | 39.4 C (102.9 F) | tie | 7 years | 3 of 100 (Routine) |
Climate Trend
47 complete years, 1906 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1906 | 16.6 C | -0.21 C |
| 1907 | 15.7 C | -1.12 C |
| 1915 | 15.8 C | -1.00 C |
| 1940 | 17.3 C | +0.47 C |
| 1941 | 16.4 C | -0.46 C |
| 1942 | 16.7 C | -0.10 C |
| 1947 | 16.4 C | -0.41 C |
| 1950 | 17.3 C | +0.43 C |
| 1951 | 16.7 C | -0.11 C |
| 1953 | 17.0 C | +0.12 C |
| 1954 | 17.5 C | +0.66 C |
| 1955 | 16.4 C | -0.46 C |
| 1956 | 16.4 C | -0.43 C |
| 1957 | 16.8 C | -0.07 C |
| 1958 | 17.0 C | +0.16 C |
| 1959 | 16.7 C | -0.11 C |
| 1960 | 16.3 C | -0.58 C |
| 1961 | 16.3 C | -0.52 C |
| 1987 | 16.3 C | -0.52 C |
| 1988 | 16.7 C | -0.14 C |
| 1989 | 17.4 C | +0.52 C |
| 1990 | 16.9 C | +0.01 C |
| 1991 | 16.3 C | -0.58 C |
| 1992 | 16.3 C | -0.56 C |
| 1993 | 16.7 C | -0.11 C |
| 1994 | 17.6 C | +0.76 C |
| 1995 | 17.0 C | +0.16 C |
| 1996 | 17.1 C | +0.28 C |
| 1997 | 16.8 C | -0.09 C |
| 1998 | 16.5 C | -0.32 C |
| 2001 | 17.2 C | +0.35 C |
| 2002 | 17.3 C | +0.50 C |
| 2003 | 17.7 C | +0.88 C |
| 2004 | 16.6 C | -0.23 C |
| 2005 | 17.4 C | +0.55 C |
| 2010 | 17.3 C | +0.41 C |
| 2012 | 17.9 C | +1.05 C |
| 2014 | 17.8 C | +0.92 C |
| 2016 | 17.9 C | +1.05 C |
| 2018 | 17.3 C | +0.44 C |
| 2019 | 16.2 C | -0.60 C |
| 2020 | 16.9 C | +0.02 C |
| 2021 | 16.5 C | -0.39 C |
| 2022 | 15.9 C | -0.94 C |
| 2023 | 16.3 C | -0.52 C |
| 2024 | 16.9 C | +0.10 C |
| 2025 | 17.4 C | +0.59 C |
The annual mean temperature here has risen by 0.06 C (0.01 to 0.11) per decade over 1906 to 2025. In Fahrenheit: 0.11 F (0.02 to 0.19) per decade. The slope is a straight line fitted to 47 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 (0.01 to 0.11) per decade | 0.11 F (0.02 to 0.19) per decade | 1906 to 2025 | 47 | Rise |
| Mean daily maximum | 0.1 C (0.1 to 0.2) per decade | 0.2 F (0.1 to 0.4) per decade | 1906 to 2025 | 47 | Rise |
| Mean daily minimum | -0.01 C (-0.09 to 0.06) per decade | -0.02 F (-0.15 to 0.11) per decade | 1906 to 2025 | 47 | 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
1898 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 45.6 C (114.1 F) | 1994 | 41.7 C (107.1 F) | 74 |
| Coldest night (TNn) | -20.6 C (-5.1 F) | 1913 | -11.4 C (11.5 F) | 74 |
| Wettest day (Rx1day) | 101.6 mm (4.0 in) | 1905 | 27.9 mm (1.1 in) | 95 |
| Wettest five days (Rx5day) | 117.3 mm (4.6 in) | 1905 | 45.7 mm (1.8 in) | 95 |
| Longest dry spell (CDD) | 162 days | 2002 | 61 days | 95 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1898 | n/a |
| 1899 | n/a |
| 1900 | n/a |
| 1903 | 40.6 C (105.1 F) |
| 1904 | 31.1 C (88.0 F) |
| 1905 | 41.1 C (106.0 F) |
| 1906 | 41.1 C (106.0 F) |
| 1907 | 41.1 C (106.0 F) |
| 1908 | 40.0 C (104.0 F) |
| 1913 | 42.2 C (108.0 F) |
| 1914 | 43.3 C (109.9 F) |
| 1915 | 41.1 C (106.0 F) |
| 1916 | 30.6 C (87.1 F) |
| 1921 | n/a |
| 1922 | n/a |
| 1923 | n/a |
| 1924 | n/a |
| 1925 | n/a |
| 1926 | n/a |
| 1927 | n/a |
| 1928 | n/a |
| 1929 | n/a |
| 1930 | n/a |
| 1931 | n/a |
| 1932 | n/a |
| 1933 | n/a |
| 1934 | n/a |
| 1935 | n/a |
| 1936 | n/a |
| 1937 | n/a |
| 1938 | n/a |
| 1939 | 23.9 C (75.0 F) |
| 1940 | 41.7 C (107.1 F) |
| 1941 | 40.0 C (104.0 F) |
| 1942 | 41.1 C (106.0 F) |
| 1943 | 40.6 C (105.1 F) |
| 1944 | 41.1 C (106.0 F) |
| 1945 | 40.6 C (105.1 F) |
| 1946 | 40.0 C (104.0 F) |
| 1947 | 40.0 C (104.0 F) |
| 1948 | 40.6 C (105.1 F) |
| 1949 | 41.1 C (106.0 F) |
| 1950 | 42.2 C (108.0 F) |
| 1951 | 41.7 C (107.1 F) |
| 1952 | 41.7 C (107.1 F) |
| 1953 | 42.8 C (109.0 F) |
| 1954 | 42.8 C (109.0 F) |
| 1955 | 41.1 C (106.0 F) |
| 1956 | 42.2 C (108.0 F) |
| 1957 | 43.3 C (109.9 F) |
| 1958 | 43.3 C (109.9 F) |
| 1959 | 41.7 C (107.1 F) |
| 1960 | 43.3 C (109.9 F) |
| 1961 | 41.1 C (106.0 F) |
| 1962 | 41.1 C (106.0 F) |
| 1987 | 41.7 C (107.1 F) |
| 1988 | 40.6 C (105.1 F) |
| 1989 | 42.8 C (109.0 F) |
| 1990 | 44.4 C (111.9 F) |
| 1991 | 40.6 C (105.1 F) |
| 1992 | 42.2 C (108.0 F) |
| 1993 | 42.2 C (108.0 F) |
| 1994 | 45.6 C (114.1 F) |
| 1995 | 43.3 C (109.9 F) |
| 1996 | 41.7 C (107.1 F) |
| 1997 | 41.7 C (107.1 F) |
| 1998 | 42.2 C (108.0 F) |
| 1999 | 41.7 C (107.1 F) |
| 2000 | 41.1 C (106.0 F) |
| 2001 | 40.6 C (105.1 F) |
| 2002 | 42.8 C (109.0 F) |
| 2003 | 43.9 C (111.0 F) |
| 2004 | 42.8 C (109.0 F) |
| 2005 | 42.8 C (109.0 F) |
| 2006 | 41.1 C (106.0 F) |
| 2007 | 42.8 C (109.0 F) |
| 2008 | 40.6 C (105.1 F) |
| 2009 | 41.1 C (106.0 F) |
| 2010 | 40.6 C (105.1 F) |
| 2011 | 42.2 C (108.0 F) |
| 2012 | 41.1 C (106.0 F) |
| 2013 | 41.7 C (107.1 F) |
| 2014 | 40.0 C (104.0 F) |
| 2015 | 42.2 C (108.0 F) |
| 2016 | 43.3 C (109.9 F) |
| 2017 | 42.8 C (109.0 F) |
| 2018 | 43.3 C (109.9 F) |
| 2019 | 41.1 C (106.0 F) |
| 2020 | 43.3 C (109.9 F) |
| 2021 | 42.2 C (108.0 F) |
| 2022 | 41.1 C (106.0 F) |
| 2023 | 41.7 C (107.1 F) |
| 2024 | 41.1 C (106.0 F) |
| 2025 | 42.8 C (109.0 F) |
| 2026 | 42.2 C (108.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1898 | n/a |
| 1899 | n/a |
| 1900 | n/a |
| 1903 | -7.8 C (18.0 F) |
| 1904 | -12.2 C (10.0 F) |
| 1905 | -10.0 C (14.0 F) |
| 1906 | -12.8 C (9.0 F) |
| 1907 | -7.2 C (19.0 F) |
| 1908 | -6.7 C (19.9 F) |
| 1913 | -20.6 C (-5.1 F) |
| 1914 | -18.9 C (-2.0 F) |
| 1915 | -11.7 C (10.9 F) |
| 1916 | -9.4 C (15.1 F) |
| 1921 | n/a |
| 1922 | n/a |
| 1923 | n/a |
| 1924 | n/a |
| 1925 | n/a |
| 1926 | n/a |
| 1927 | n/a |
| 1928 | n/a |
| 1929 | n/a |
| 1930 | n/a |
| 1931 | n/a |
| 1932 | n/a |
| 1933 | n/a |
| 1934 | n/a |
| 1935 | n/a |
| 1936 | n/a |
| 1937 | n/a |
| 1938 | n/a |
| 1939 | -6.1 C (21.0 F) |
| 1940 | -6.7 C (19.9 F) |
| 1941 | -8.3 C (17.1 F) |
| 1942 | -8.9 C (16.0 F) |
| 1943 | -10.0 C (14.0 F) |
| 1944 | -12.2 C (10.0 F) |
| 1945 | -10.6 C (12.9 F) |
| 1946 | -12.8 C (9.0 F) |
| 1947 | -13.3 C (8.1 F) |
| 1948 | -15.0 C (5.0 F) |
| 1949 | -11.1 C (12.0 F) |
| 1950 | -13.9 C (7.0 F) |
| 1951 | -12.2 C (10.0 F) |
| 1952 | -8.9 C (16.0 F) |
| 1953 | -15.0 C (5.0 F) |
| 1954 | -14.4 C (6.1 F) |
| 1955 | -13.3 C (8.1 F) |
| 1956 | -11.7 C (10.9 F) |
| 1957 | -8.9 C (16.0 F) |
| 1958 | -13.3 C (8.1 F) |
| 1959 | -13.3 C (8.1 F) |
| 1960 | -12.8 C (9.0 F) |
| 1961 | -8.9 C (16.0 F) |
| 1962 | -16.7 C (1.9 F) |
| 1987 | -13.9 C (7.0 F) |
| 1988 | -12.2 C (10.0 F) |
| 1989 | -11.7 C (10.9 F) |
| 1990 | -11.7 C (10.9 F) |
| 1991 | -9.4 C (15.1 F) |
| 1992 | -11.1 C (12.0 F) |
| 1993 | -8.9 C (16.0 F) |
| 1994 | -10.0 C (14.0 F) |
| 1995 | -7.2 C (19.0 F) |
| 1996 | -11.1 C (12.0 F) |
| 1997 | -10.0 C (14.0 F) |
| 1998 | -7.8 C (18.0 F) |
| 1999 | -10.0 C (14.0 F) |
| 2000 | -10.0 C (14.0 F) |
| 2001 | -8.9 C (16.0 F) |
| 2002 | -11.7 C (10.9 F) |
| 2003 | -13.3 C (8.1 F) |
| 2004 | -11.1 C (12.0 F) |
| 2005 | -11.7 C (10.9 F) |
| 2006 | -10.0 C (14.0 F) |
| 2007 | -13.9 C (7.0 F) |
| 2008 | -10.6 C (12.9 F) |
| 2009 | -8.3 C (17.1 F) |
| 2010 | -12.2 C (10.0 F) |
| 2011 | -17.8 C (0.0 F) |
| 2012 | -8.9 C (16.0 F) |
| 2013 | -16.1 C (3.0 F) |
| 2014 | -8.9 C (16.0 F) |
| 2015 | -8.9 C (16.0 F) |
| 2016 | -8.9 C (16.0 F) |
| 2017 | -11.1 C (12.0 F) |
| 2018 | -13.9 C (7.0 F) |
| 2019 | -12.2 C (10.0 F) |
| 2020 | -13.3 C (8.1 F) |
| 2021 | -15.0 C (5.0 F) |
| 2022 | -12.8 C (9.0 F) |
| 2023 | -12.2 C (10.0 F) |
| 2024 | -10.6 C (12.9 F) |
| 2025 | -16.1 C (3.0 F) |
| 2026 | -8.3 C (17.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1898 | 13.0 mm (0.5 in) |
| 1899 | 33.0 mm (1.3 in) |
| 1900 | 33.0 mm (1.3 in) |
| 1903 | 54.6 mm (2.1 in) |
| 1904 | 31.2 mm (1.2 in) |
| 1905 | 101.6 mm (4.0 in) |
| 1906 | 24.1 mm (0.9 in) |
| 1907 | 23.6 mm (0.9 in) |
| 1908 | 27.9 mm (1.1 in) |
| 1913 | 22.9 mm (0.9 in) |
| 1914 | 43.2 mm (1.7 in) |
| 1915 | 16.5 mm (0.6 in) |
| 1916 | 66.8 mm (2.6 in) |
| 1921 | 50.8 mm (2.0 in) |
| 1922 | 20.3 mm (0.8 in) |
| 1923 | 25.1 mm (1.0 in) |
| 1924 | 18.3 mm (0.7 in) |
| 1925 | 17.8 mm (0.7 in) |
| 1926 | 22.9 mm (0.9 in) |
| 1927 | 41.9 mm (1.6 in) |
| 1928 | 27.9 mm (1.1 in) |
| 1929 | 45.7 mm (1.8 in) |
| 1930 | 18.3 mm (0.7 in) |
| 1931 | 18.3 mm (0.7 in) |
| 1932 | 19.3 mm (0.8 in) |
| 1933 | 23.1 mm (0.9 in) |
| 1934 | 27.4 mm (1.1 in) |
| 1935 | 21.6 mm (0.9 in) |
| 1936 | 17.3 mm (0.7 in) |
| 1937 | 41.7 mm (1.6 in) |
| 1938 | 27.9 mm (1.1 in) |
| 1939 | 29.5 mm (1.2 in) |
| 1940 | 22.6 mm (0.9 in) |
| 1941 | 33.0 mm (1.3 in) |
| 1942 | 26.2 mm (1.0 in) |
| 1943 | 28.2 mm (1.1 in) |
| 1944 | 22.6 mm (0.9 in) |
| 1945 | 49.5 mm (1.9 in) |
| 1946 | 20.3 mm (0.8 in) |
| 1947 | 16.3 mm (0.6 in) |
| 1948 | 4.3 mm (0.17 in) |
| 1949 | 31.0 mm (1.2 in) |
| 1950 | 27.9 mm (1.1 in) |
| 1951 | 28.4 mm (1.1 in) |
| 1952 | 41.9 mm (1.6 in) |
| 1953 | 22.4 mm (0.9 in) |
| 1954 | 43.2 mm (1.7 in) |
| 1955 | 16.8 mm (0.7 in) |
| 1956 | 21.6 mm (0.9 in) |
| 1957 | 28.4 mm (1.1 in) |
| 1958 | 22.9 mm (0.9 in) |
| 1959 | 19.1 mm (0.8 in) |
| 1960 | 26.4 mm (1.0 in) |
| 1961 | 63.5 mm (2.5 in) |
| 1962 | 17.8 mm (0.7 in) |
| 1987 | 46.2 mm (1.8 in) |
| 1988 | 54.6 mm (2.1 in) |
| 1989 | 25.4 mm (1.0 in) |
| 1990 | 36.8 mm (1.4 in) |
| 1991 | 43.9 mm (1.7 in) |
| 1992 | 40.6 mm (1.6 in) |
| 1993 | 41.7 mm (1.6 in) |
| 1994 | 78.7 mm (3.1 in) |
| 1995 | 43.9 mm (1.7 in) |
| 1996 | 33.5 mm (1.3 in) |
| 1997 | 43.7 mm (1.7 in) |
| 1998 | 23.6 mm (0.9 in) |
| 1999 | 37.8 mm (1.5 in) |
| 2000 | 39.9 mm (1.6 in) |
| 2001 | 22.9 mm (0.9 in) |
| 2002 | 26.7 mm (1.1 in) |
| 2003 | 20.3 mm (0.8 in) |
| 2004 | 33.0 mm (1.3 in) |
| 2005 | 27.9 mm (1.1 in) |
| 2006 | 53.3 mm (2.1 in) |
| 2007 | 30.5 mm (1.2 in) |
| 2008 | 30.5 mm (1.2 in) |
| 2009 | 24.9 mm (1.0 in) |
| 2010 | 26.9 mm (1.1 in) |
| 2011 | 27.9 mm (1.1 in) |
| 2012 | 27.9 mm (1.1 in) |
| 2013 | 26.9 mm (1.1 in) |
| 2014 | 40.1 mm (1.6 in) |
| 2015 | 21.8 mm (0.9 in) |
| 2016 | 29.2 mm (1.1 in) |
| 2017 | 11.7 mm (0.5 in) |
| 2018 | 31.8 mm (1.3 in) |
| 2019 | 41.4 mm (1.6 in) |
| 2020 | 26.7 mm (1.1 in) |
| 2021 | 30.5 mm (1.2 in) |
| 2022 | 32.8 mm (1.3 in) |
| 2023 | 37.3 mm (1.5 in) |
| 2024 | 23.4 mm (0.9 in) |
| 2025 | 20.6 mm (0.8 in) |
| 2026 | 35.3 mm (1.4 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1898 | 25.7 mm (1.0 in) |
| 1899 | 38.1 mm (1.5 in) |
| 1900 | 64.2 mm (2.5 in) |
| 1903 | 77.5 mm (3.1 in) |
| 1904 | 59.4 mm (2.3 in) |
| 1905 | 117.3 mm (4.6 in) |
| 1906 | 38.8 mm (1.5 in) |
| 1907 | 37.5 mm (1.5 in) |
| 1908 | 53.3 mm (2.1 in) |
| 1913 | 44.5 mm (1.8 in) |
| 1914 | 63.5 mm (2.5 in) |
| 1915 | 19.1 mm (0.8 in) |
| 1916 | 98.0 mm (3.9 in) |
| 1921 | 53.3 mm (2.1 in) |
| 1922 | 23.9 mm (0.9 in) |
| 1923 | 33.7 mm (1.3 in) |
| 1924 | 18.8 mm (0.7 in) |
| 1925 | 27.5 mm (1.1 in) |
| 1926 | 57.6 mm (2.3 in) |
| 1927 | 53.3 mm (2.1 in) |
| 1928 | 45.5 mm (1.8 in) |
| 1929 | 80.8 mm (3.2 in) |
| 1930 | 41.7 mm (1.6 in) |
| 1931 | 48.8 mm (1.9 in) |
| 1932 | 34.8 mm (1.4 in) |
| 1933 | 26.4 mm (1.0 in) |
| 1934 | 32.5 mm (1.3 in) |
| 1935 | 42.8 mm (1.7 in) |
| 1936 | 27.4 mm (1.1 in) |
| 1937 | 52.6 mm (2.1 in) |
| 1938 | 35.6 mm (1.4 in) |
| 1939 | 29.5 mm (1.2 in) |
| 1940 | 23.8 mm (0.9 in) |
| 1941 | 46.2 mm (1.8 in) |
| 1942 | 49.3 mm (1.9 in) |
| 1943 | 35.8 mm (1.4 in) |
| 1944 | 46.5 mm (1.8 in) |
| 1945 | 64.0 mm (2.5 in) |
| 1946 | 31.7 mm (1.2 in) |
| 1947 | 16.3 mm (0.6 in) |
| 1948 | 4.3 mm (0.17 in) |
| 1949 | 45.0 mm (1.8 in) |
| 1950 | 34.3 mm (1.4 in) |
| 1951 | 38.1 mm (1.5 in) |
| 1952 | 46.0 mm (1.8 in) |
| 1953 | 33.6 mm (1.3 in) |
| 1954 | 75.9 mm (3.0 in) |
| 1955 | 29.0 mm (1.1 in) |
| 1956 | 37.6 mm (1.5 in) |
| 1957 | 62.2 mm (2.4 in) |
| 1958 | 59.7 mm (2.4 in) |
| 1959 | 33.1 mm (1.3 in) |
| 1960 | 28.4 mm (1.1 in) |
| 1961 | 76.7 mm (3.0 in) |
| 1962 | 29.5 mm (1.2 in) |
| 1987 | 48.7 mm (1.9 in) |
| 1988 | 75.2 mm (3.0 in) |
| 1989 | 26.7 mm (1.1 in) |
| 1990 | 68.6 mm (2.7 in) |
| 1991 | 99.3 mm (3.9 in) |
| 1992 | 55.9 mm (2.2 in) |
| 1993 | 57.2 mm (2.3 in) |
| 1994 | 93.5 mm (3.7 in) |
| 1995 | 65.2 mm (2.6 in) |
| 1996 | 55.9 mm (2.2 in) |
| 1997 | 43.7 mm (1.7 in) |
| 1998 | 32.2 mm (1.3 in) |
| 1999 | 54.1 mm (2.1 in) |
| 2000 | 67.8 mm (2.7 in) |
| 2001 | 45.7 mm (1.8 in) |
| 2002 | 46.3 mm (1.8 in) |
| 2003 | 22.8 mm (0.9 in) |
| 2004 | 53.3 mm (2.1 in) |
| 2005 | 38.6 mm (1.5 in) |
| 2006 | 68.6 mm (2.7 in) |
| 2007 | 57.4 mm (2.3 in) |
| 2008 | 52.9 mm (2.1 in) |
| 2009 | 35.9 mm (1.4 in) |
| 2010 | 46.2 mm (1.8 in) |
| 2011 | 53.8 mm (2.1 in) |
| 2012 | 58.7 mm (2.3 in) |
| 2013 | 47.7 mm (1.9 in) |
| 2014 | 72.1 mm (2.8 in) |
| 2015 | 27.9 mm (1.1 in) |
| 2016 | 30.2 mm (1.2 in) |
| 2017 | 25.4 mm (1.0 in) |
| 2018 | 42.5 mm (1.7 in) |
| 2019 | 69.3 mm (2.7 in) |
| 2020 | 29.3 mm (1.2 in) |
| 2021 | 51.3 mm (2.0 in) |
| 2022 | 67.1 mm (2.6 in) |
| 2023 | 38.8 mm (1.5 in) |
| 2024 | 42.6 mm (1.7 in) |
| 2025 | 32.6 mm (1.3 in) |
| 2026 | 62.7 mm (2.5 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1898 | 61 days |
| 1899 | 88 days |
| 1900 | 134 days |
| 1903 | 71 days |
| 1904 | 74 days |
| 1905 | 47 days |
| 1906 | 87 days |
| 1907 | 62 days |
| 1908 | 78 days |
| 1913 | 42 days |
| 1914 | 80 days |
| 1915 | 99 days |
| 1916 | 36 days |
| 1921 | 52 days |
| 1922 | 41 days |
| 1923 | 51 days |
| 1924 | 99 days |
| 1925 | 50 days |
| 1926 | 28 days |
| 1927 | 36 days |
| 1928 | 75 days |
| 1929 | 62 days |
| 1930 | 47 days |
| 1931 | 47 days |
| 1932 | 63 days |
| 1933 | 48 days |
| 1934 | 89 days |
| 1935 | 73 days |
| 1936 | 57 days |
| 1937 | 71 days |
| 1938 | 54 days |
| 1939 | 77 days |
| 1940 | 30 days |
| 1941 | 40 days |
| 1942 | 55 days |
| 1943 | 78 days |
| 1944 | 53 days |
| 1945 | 137 days |
| 1946 | 78 days |
| 1947 | 150 days |
| 1948 | 61 days |
| 1949 | 53 days |
| 1950 | 92 days |
| 1951 | 58 days |
| 1952 | 73 days |
| 1953 | 57 days |
| 1954 | 59 days |
| 1955 | 114 days |
| 1956 | 69 days |
| 1957 | 52 days |
| 1958 | 45 days |
| 1959 | 61 days |
| 1960 | 102 days |
| 1961 | 91 days |
| 1962 | 60 days |
| 1987 | 42 days |
| 1988 | 58 days |
| 1989 | 68 days |
| 1990 | 46 days |
| 1991 | 64 days |
| 1992 | 65 days |
| 1993 | 105 days |
| 1994 | 52 days |
| 1995 | 87 days |
| 1996 | 107 days |
| 1997 | 79 days |
| 1998 | 71 days |
| 1999 | 100 days |
| 2000 | 75 days |
| 2001 | 42 days |
| 2002 | 162 days |
| 2003 | 122 days |
| 2004 | 94 days |
| 2005 | 85 days |
| 2006 | 158 days |
| 2007 | 51 days |
| 2008 | 155 days |
| 2009 | 56 days |
| 2010 | 61 days |
| 2011 | 57 days |
| 2012 | 59 days |
| 2013 | 61 days |
| 2014 | 35 days |
| 2015 | 31 days |
| 2016 | 38 days |
| 2017 | 33 days |
| 2018 | 51 days |
| 2019 | 34 days |
| 2020 | 42 days |
| 2021 | 49 days |
| 2022 | 69 days |
| 2023 | 83 days |
| 2024 | 80 days |
| 2025 | 78 days |
| 2026 | 51 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
47 years with a frostAcross 47 years with a frost, the median last spring frost at San Simon falls on 23 April and the median first autumn frost on 31 October, which leaves a median of 192 days between them.
Fitted over all years, the growing season changes by -0.6 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1961 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 23 April | n/a | 24 April | n/a | +1.1 days per decade |
| First autumn frost | 31 October | n/a | 2 November | n/a | +0.5 days per decade |
| Growing days | 192 days | n/a | 195 days | n/a | -0.6 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
80 years, 1899 to 2025A day with at least 28.4 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 83.8 mm (3.3 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 28.4 mm (1.1 in) | |
| 5 years | 39.1 mm (1.5 in) | |
| 10 years | 47.7 mm (1.9 in) | |
| 25 years | 60.3 mm (2.4 in) | |
| 50 years | 71.3 mm (2.8 in) | |
| 100 years | 83.8 mm (3.3 in) | Longer than the 80 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, 80 years of values from 1899 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: 101.6 mm (4.0 in) in 1905; 78.7 mm (3.1 in) in 1994; 63.5 mm (2.5 in) in 1961.
Station Changes
2 suspected2 changes were suspected in the annual mean temperature of San Simon, at 1958 and 1995. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1958 ran 0.3 C (0.5 F) lower than in the years before (possible change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1995 ran 0.4 C (0.8 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1958 | -0.3 | -0.5 | possible | 5 |
| 1995 | -0.4 | -0.8 | 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-15).