Imperial Co AP Weather Records (USW00003144)
Record envelope, standing records and threshold days for Imperial Co AP (USW00003144), California, United States, with 65 years of record.
Key Facts for Imperial Co AP
- Imperial Co AP (USW00003144) is a weather station in California, United States at 32.83 latitude and -115.58 longitude, -17 m (-55 ft) above sea level.
- The station reports from 1962 to 2026, 65 years of record.
- 1,464 records set at Imperial Co AP still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Imperial Co AP set a daily record precipitation of 21.3 mm (0.8 in) on 10 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: California, United States, 32.83 latitude, -115.58 longitude.
- Elevation: -17 m (-55 ft).
- Period of record: 1962 to 2026, 65 years.
- Eligible elements: tmax, tmin, prcp.
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 | 32.2 C (90.0 F) | -6.1 C (21.0 F) | 27.8 C (82.0 F) | 1.7 C (35.1 F) |
| Feb | 36.1 C (97.0 F) | -5.5 C (22.1 F) | 36.1 C (97.0 F) | 3.3 C (37.9 F) |
| Mar | 41.7 C (107.1 F) | -2.2 C (28.0 F) | 41.7 C (107.1 F) | 7.8 C (46.0 F) |
| Apr | 41.1 C (106.0 F) | 3.3 C (37.9 F) | 36.7 C (98.1 F) | 10.0 C (50.0 F) |
| May | 44.4 C (111.9 F) | 6.1 C (43.0 F) | 42.2 C (108.0 F) | 12.2 C (54.0 F) |
| Jun | 50.0 C (122.0 F) | 11.7 C (53.1 F) | 44.4 C (111.9 F) | 18.9 C (66.0 F) |
| Jul | 49.4 C (120.9 F) | 17.2 C (63.0 F) | 47.8 C (118.0 F) | 19.4 C (66.9 F) |
| Aug | 48.3 C (118.9 F) | 16.1 C (61.0 F) | 47.2 C (117.0 F) | 27.2 C (81.0 F) |
| Sep | 49.4 C (120.9 F) | 12.2 C (54.0 F) | 45.0 C (113.0 F) | 17.2 C (63.0 F) |
| Oct | 43.3 C (109.9 F) | 0.0 C (32.0 F) | 41.7 C (107.1 F) | 17.8 C (64.0 F) |
| Nov | 38.3 C (100.9 F) | -1.1 C (30.0 F) | n/a | n/a |
| Dec | 30.6 C (87.1 F) | -4.4 C (24.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1962 | 45 |
| 1963 | 42 |
| 1964 | 55 |
| 1965 | 54 |
| 1966 | 40 |
| 1967 | 29 |
| 1968 | 35 |
| 1969 | 33 |
| 1970 | 28 |
| 1971 | 64 |
| 1972 | 33 |
| 1973 | 28 |
| 1974 | 27 |
| 1975 | 39 |
| 1976 | 36 |
| 1977 | 29 |
| 1978 | 25 |
| 1979 | 37 |
| 1980 | 39 |
| 1981 | 13 |
| 2000 | 15 |
| 2001 | 21 |
| 2002 | 24 |
| 2003 | 30 |
| 2004 | 22 |
| 2005 | 16 |
| 2006 | 30 |
| 2007 | 26 |
| 2008 | 24 |
| 2009 | 22 |
| 2010 | 34 |
| 2011 | 28 |
| 2012 | 26 |
| 2013 | 25 |
| 2014 | 25 |
| 2015 | 35 |
| 2016 | 34 |
| 2017 | 37 |
| 2018 | 22 |
| 2019 | 27 |
| 2020 | 36 |
| 2021 | 30 |
| 2022 | 22 |
| 2023 | 19 |
| 2024 | 17 |
| 2025 | 32 |
| 2026 | 54 |
All-Time Record Progression
1 new records| Date | Kind | Detail |
|---|---|---|
| 2017-06-20 | Record high maximum temperature | Record high maximum temperature 50.0 C (122.0 F) |
Wettest Day of Each Month
Sep: 56.4 mm (2.2 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 27.9 mm (1.1 in) | 21 January 2010 |
| Feb | 29.7 mm (1.2 in) | 22 February 2004 |
| Mar | 16.8 mm (0.7 in) | 7 March 2010 |
| Apr | 15.5 mm (0.6 in) | 9 April 1975 |
| May | 15.7 mm (0.6 in) | 15 May 2015 |
| Jun | 2.0 mm (0.08 in) | 9 June 2015 |
| Jul | 23.1 mm (0.9 in) | 30 July 2012 |
| Aug | 55.4 mm (2.2 in) | 15 August 1977 |
| Sep | 56.4 mm (2.2 in) | 10 September 1976 |
| Oct | 39.9 mm (1.6 in) | 6 October 1972 |
| Nov | 38.1 mm (1.5 in) | 9 November 1969 |
| Dec | 24.9 mm (1.0 in) | 17 December 2008 |
Period of Record Coverage
1962 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1962 | 334 | 92% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 365 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 273 | 75% | No |
| 2000 | 149 | 41% | No |
| 2001 | 361 | 99% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 347 | 95% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 365 | 100% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 364 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 365 | 100% | Yes |
| 2013 | 363 | 99% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 360 | 98% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 363 | 99% | Yes |
| 2019 | 352 | 96% | Yes |
| 2020 | 351 | 96% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 358 | 98% | Yes |
| 2023 | 358 | 98% | Yes |
| 2024 | 300 | 82% | No |
| 2025 | 320 | 88% | No |
| 2026 | 285 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 10 October 2026 | Imperial Co AP, US | daily rain (Provisional) | 21.3 mm (0.8 in) | 20.8 mm (0.8 in) | 0 years | 20 of 100 (Routine) |
| 9 October 2026 | Imperial Co AP, US | daily high max (Provisional) | 41.1 C (106.0 F) | 2.2 C (4.0 F) | 61 years | 29 of 100 (Routine) |
| 9 October 2026 | Imperial Co AP, US | daily high min (Provisional) | 23.9 C (75.0 F) | 0.6 C (1.1 F) | 48 years | 21 of 100 (Routine) |
| 8 October 2026 | Imperial Co AP, US | daily high max (Provisional) | 41.7 C (107.1 F) | 1.7 C (3.1 F) | 61 years | 27 of 100 (Routine) |
| 8 October 2026 | Imperial Co AP, US | daily high min (Provisional) | 23.3 C (73.9 F) | 0.5 C (0.9 F) | 4 years | 8 of 100 (Routine) |
| 7 October 2026 | Imperial Co AP, US | daily high max (Provisional) | 41.1 C (106.0 F) | 1.1 C (2.0 F) | 45 years | 21 of 100 (Routine) |
| 7 October 2026 | Imperial Co AP, US | daily high min (Tie, Provisional) | 22.8 C (73.0 F) | tie | 4 years | 1 of 100 (Routine) |
| 28 September 2026 | Imperial Co AP, US | daily rain (Provisional) | 4.1 mm (0.16 in) | 4.1 mm (0.16 in) | 64 years | 20 of 100 (Routine) |
| 27 September 2026 | Imperial Co AP, US | daily rain (Provisional) | 1.3 mm (0.05 in) | 1.3 mm (0.05 in) | 64 years | 20 of 100 (Routine) |
| 15 September 2026 | Imperial Co AP, US | daily high min (Provisional) | 28.3 C (82.9 F) | 0.5 C (0.9 F) | 12 years | 10 of 100 (Routine) |
| 13 September 2026 | Imperial Co AP, US | daily high min (Provisional) | 28.3 C (82.9 F) | 0.5 C (0.9 F) | 19 years | 12 of 100 (Routine) |
| 12 September 2026 | Imperial Co AP, US | daily high min (Provisional) | 29.4 C (84.9 F) | 0.5 C (0.9 F) | 11 years | 10 of 100 (Routine) |
| 11 September 2026 | Imperial Co AP, US | daily high min (Provisional) | 31.1 C (88.0 F) | 2.8 C (5.0 F) | 56 years | 29 of 100 (Routine) |
| 10 September 2026 | Imperial Co AP, US | monthly high min (Provisional) | 32.2 C (90.0 F) | 0.5 C (0.9 F) | 0 years | 17 of 100 (Routine) |
| 10 September 2026 | Imperial Co AP, US | daily high max (Tie, Provisional) | 45.0 C (113.0 F) | tie | 57 years | 5 of 100 (Routine) |
| 9 September 2026 | Imperial Co AP, US | monthly high min (Provisional) | 31.7 C (89.1 F) | 0.6 C (1.1 F) | 4 years | 18 of 100 (Routine) |
| 28 August 2026 | Imperial Co AP, US | daily high min (Provisional) | 31.1 C (88.0 F) | 0.5 C (0.9 F) | 11 years | 10 of 100 (Routine) |
| 27 August 2026 | Imperial Co AP, US | daily high min (Tie, Provisional) | 30.6 C (87.1 F) | tie | 19 years | 2 of 100 (Routine) |
| 26 August 2026 | Imperial Co AP, US | daily high max (Provisional) | 46.7 C (116.1 F) | 0.6 C (1.1 F) | 44 years | 21 of 100 (Routine) |
| 24 August 2026 | Imperial Co AP, US | daily high min (Provisional) | 31.7 C (89.1 F) | 0.6 C (1.1 F) | 56 years | 24 of 100 (Routine) |
Climate Trend
39 complete years, 1963 to 2023| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1963 | 22.4 C | -0.38 C |
| 1964 | 21.7 C | -1.11 C |
| 1965 | 22.0 C | -0.81 C |
| 1966 | 22.9 C | +0.04 C |
| 1967 | 22.5 C | -0.35 C |
| 1968 | 22.7 C | -0.15 C |
| 1969 | 22.9 C | +0.13 C |
| 1970 | 22.5 C | -0.27 C |
| 1971 | 21.7 C | -1.08 C |
| 1972 | 22.2 C | -0.62 C |
| 1973 | 21.8 C | -1.04 C |
| 1974 | 22.3 C | -0.55 C |
| 1975 | 21.2 C | -1.61 C |
| 1976 | 21.6 C | -1.24 C |
| 1977 | 22.0 C | -0.85 C |
| 1978 | 22.0 C | -0.78 C |
| 1979 | 21.6 C | -1.19 C |
| 1980 | 22.4 C | -0.41 C |
| 2001 | 23.0 C | +0.20 C |
| 2002 | 22.6 C | -0.26 C |
| 2003 | 23.0 C | +0.16 C |
| 2004 | 22.4 C | -0.42 C |
| 2006 | 23.5 C | +0.71 C |
| 2007 | 23.5 C | +0.68 C |
| 2008 | 23.3 C | +0.50 C |
| 2009 | 23.5 C | +0.68 C |
| 2010 | 22.9 C | +0.05 C |
| 2011 | 22.6 C | -0.19 C |
| 2012 | 23.7 C | +0.86 C |
| 2013 | 23.2 C | +0.37 C |
| 2014 | 24.2 C | +1.39 C |
| 2015 | 24.1 C | +1.32 C |
| 2016 | 24.5 C | +1.69 C |
| 2017 | 24.4 C | +1.54 C |
| 2018 | 24.2 C | +1.36 C |
| 2019 | 22.6 C | -0.23 C |
| 2021 | 23.8 C | +0.95 C |
| 2022 | 23.6 C | +0.81 C |
| 2023 | 22.8 C | +0.03 C |
The annual mean temperature here has risen by 0.3 C (0.2 to 0.4) per decade over 1963 to 2023. In Fahrenheit: 0.5 F (0.4 to 0.7) per decade. The slope is a straight line fitted to 39 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.3 C (0.2 to 0.4) per decade | 0.5 F (0.4 to 0.7) per decade | 1963 to 2023 | 39 | Rise |
| Mean daily maximum | 0.2 C (0.1 to 0.3) per decade | 0.4 F (0.2 to 0.6) per decade | 1963 to 2023 | 39 | Rise |
| Mean daily minimum | 0.4 C (0.3 to 0.5) per decade | 0.7 F (0.5 to 0.9) per decade | 1963 to 2023 | 39 | Rise |
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1962 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 50.0 C (122.0 F) | 2017 | 47.2 C (117.0 F) | 47 |
| Coldest night (TNn) | -6.1 C (21.0 F) | 1963 | -1.7 C (28.9 F) | 47 |
| Wettest day (Rx1day) | 56.4 mm (2.2 in) | 1976 | 15.5 mm (0.6 in) | 47 |
| Wettest five days (Rx5day) | 95.3 mm (3.8 in) | 1977 | 19.4 mm (0.8 in) | 47 |
| Longest dry spell (CDD) | 329 days | 2002 | 163 days | 47 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1962 | 47.2 C (117.0 F) |
| 1963 | 45.6 C (114.1 F) |
| 1964 | 47.8 C (118.0 F) |
| 1965 | 46.1 C (115.0 F) |
| 1966 | 47.8 C (118.0 F) |
| 1967 | 46.7 C (116.1 F) |
| 1968 | 47.2 C (117.0 F) |
| 1969 | 47.8 C (118.0 F) |
| 1970 | 48.9 C (120.0 F) |
| 1971 | 47.8 C (118.0 F) |
| 1972 | 47.2 C (117.0 F) |
| 1973 | 47.8 C (118.0 F) |
| 1974 | 48.9 C (120.0 F) |
| 1975 | 47.2 C (117.0 F) |
| 1976 | 46.1 C (115.0 F) |
| 1977 | 46.7 C (116.1 F) |
| 1978 | 47.2 C (117.0 F) |
| 1979 | 46.1 C (115.0 F) |
| 1980 | 45.6 C (114.1 F) |
| 1981 | 47.2 C (117.0 F) |
| 2000 | 46.1 C (115.0 F) |
| 2001 | 47.2 C (117.0 F) |
| 2002 | 45.6 C (114.1 F) |
| 2003 | 47.2 C (117.0 F) |
| 2004 | 45.6 C (114.1 F) |
| 2005 | 49.4 C (120.9 F) |
| 2006 | 48.3 C (118.9 F) |
| 2007 | 46.7 C (116.1 F) |
| 2008 | 46.7 C (116.1 F) |
| 2009 | 47.2 C (117.0 F) |
| 2010 | 46.7 C (116.1 F) |
| 2011 | 46.7 C (116.1 F) |
| 2012 | 46.7 C (116.1 F) |
| 2013 | 48.9 C (120.0 F) |
| 2014 | 47.2 C (117.0 F) |
| 2015 | 47.8 C (118.0 F) |
| 2016 | 49.4 C (120.9 F) |
| 2017 | 50.0 C (122.0 F) |
| 2018 | 49.4 C (120.9 F) |
| 2019 | 47.8 C (118.0 F) |
| 2020 | 49.4 C (120.9 F) |
| 2021 | 48.3 C (118.9 F) |
| 2022 | 45.6 C (114.1 F) |
| 2023 | 47.8 C (118.0 F) |
| 2024 | 48.9 C (120.0 F) |
| 2025 | 47.8 C (118.0 F) |
| 2026 | 47.8 C (118.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1962 | -2.8 C (27.0 F) |
| 1963 | -6.1 C (21.0 F) |
| 1964 | -3.3 C (26.1 F) |
| 1965 | -3.3 C (26.1 F) |
| 1966 | -2.2 C (28.0 F) |
| 1967 | -2.8 C (27.0 F) |
| 1968 | -3.9 C (25.0 F) |
| 1969 | -1.7 C (28.9 F) |
| 1970 | -2.8 C (27.0 F) |
| 1971 | -5.6 C (21.9 F) |
| 1972 | -5.6 C (21.9 F) |
| 1973 | -2.8 C (27.0 F) |
| 1974 | -3.3 C (26.1 F) |
| 1975 | -2.8 C (27.0 F) |
| 1976 | -3.3 C (26.1 F) |
| 1977 | -1.1 C (30.0 F) |
| 1978 | -4.4 C (24.1 F) |
| 1979 | -3.9 C (25.0 F) |
| 1980 | 1.1 C (34.0 F) |
| 1981 | 1.7 C (35.1 F) |
| 2000 | 0.6 C (33.1 F) |
| 2001 | 0.0 C (32.0 F) |
| 2002 | -2.2 C (28.0 F) |
| 2003 | -2.2 C (28.0 F) |
| 2004 | -2.8 C (27.0 F) |
| 2005 | -0.6 C (30.9 F) |
| 2006 | -0.5 C (31.1 F) |
| 2007 | -6.0 C (21.2 F) |
| 2008 | 0.0 C (32.0 F) |
| 2009 | 0.0 C (32.0 F) |
| 2010 | -0.5 C (31.1 F) |
| 2011 | -5.5 C (22.1 F) |
| 2012 | 0.0 C (32.0 F) |
| 2013 | -2.7 C (27.1 F) |
| 2014 | -0.5 C (31.1 F) |
| 2015 | -2.7 C (27.1 F) |
| 2016 | 0.0 C (32.0 F) |
| 2017 | 1.1 C (34.0 F) |
| 2018 | 1.1 C (34.0 F) |
| 2019 | -1.6 C (29.1 F) |
| 2020 | 0.0 C (32.0 F) |
| 2021 | 1.1 C (34.0 F) |
| 2022 | -0.5 C (31.1 F) |
| 2023 | 0.0 C (32.0 F) |
| 2024 | 0.0 C (32.0 F) |
| 2025 | -0.5 C (31.1 F) |
| 2026 | 1.7 C (35.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1962 | 12.2 mm (0.5 in) |
| 1963 | 20.1 mm (0.8 in) |
| 1964 | 8.4 mm (0.33 in) |
| 1965 | 21.6 mm (0.9 in) |
| 1966 | 7.6 mm (0.30 in) |
| 1967 | 35.6 mm (1.4 in) |
| 1968 | 15.2 mm (0.6 in) |
| 1969 | 38.1 mm (1.5 in) |
| 1970 | 13.0 mm (0.5 in) |
| 1971 | 11.2 mm (0.4 in) |
| 1972 | 39.9 mm (1.6 in) |
| 1973 | 5.3 mm (0.21 in) |
| 1974 | 21.8 mm (0.9 in) |
| 1975 | 15.5 mm (0.6 in) |
| 1976 | 56.4 mm (2.2 in) |
| 1977 | 55.4 mm (2.2 in) |
| 1978 | 14.2 mm (0.6 in) |
| 1979 | 15.0 mm (0.6 in) |
| 1980 | 18.3 mm (0.7 in) |
| 1981 | 18.8 mm (0.7 in) |
| 2000 | 5.3 mm (0.21 in) |
| 2001 | 9.4 mm (0.37 in) |
| 2002 | 2.5 mm (0.10 in) |
| 2003 | 25.1 mm (1.0 in) |
| 2004 | 29.7 mm (1.2 in) |
| 2005 | 27.2 mm (1.1 in) |
| 2006 | 8.4 mm (0.33 in) |
| 2007 | 18.5 mm (0.7 in) |
| 2008 | 24.9 mm (1.0 in) |
| 2009 | 8.1 mm (0.32 in) |
| 2010 | 27.9 mm (1.1 in) |
| 2011 | 9.7 mm (0.38 in) |
| 2012 | 23.1 mm (0.9 in) |
| 2013 | 24.1 mm (0.9 in) |
| 2014 | 37.1 mm (1.5 in) |
| 2015 | 15.7 mm (0.6 in) |
| 2016 | 15.2 mm (0.6 in) |
| 2017 | 8.9 mm (0.35 in) |
| 2018 | 19.6 mm (0.8 in) |
| 2019 | 11.2 mm (0.4 in) |
| 2020 | 7.9 mm (0.31 in) |
| 2021 | 0.5 mm (0.02 in) |
| 2022 | 27.4 mm (1.1 in) |
| 2023 | 13.2 mm (0.5 in) |
| 2024 | 1.5 mm (0.06 in) |
| 2025 | 12.2 mm (0.5 in) |
| 2026 | 21.3 mm (0.8 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1962 | 19.1 mm (0.8 in) |
| 1963 | 20.1 mm (0.8 in) |
| 1964 | 8.4 mm (0.33 in) |
| 1965 | 21.6 mm (0.9 in) |
| 1966 | 13.8 mm (0.5 in) |
| 1967 | 35.6 mm (1.4 in) |
| 1968 | 23.8 mm (0.9 in) |
| 1969 | 44.2 mm (1.7 in) |
| 1970 | 17.4 mm (0.7 in) |
| 1971 | 11.2 mm (0.4 in) |
| 1972 | 39.9 mm (1.6 in) |
| 1973 | 7.9 mm (0.31 in) |
| 1974 | 33.5 mm (1.3 in) |
| 1975 | 15.5 mm (0.6 in) |
| 1976 | 72.9 mm (2.9 in) |
| 1977 | 95.3 mm (3.8 in) |
| 1978 | 18.6 mm (0.7 in) |
| 1979 | 19.4 mm (0.8 in) |
| 1980 | 24.1 mm (0.9 in) |
| 1981 | 22.1 mm (0.9 in) |
| 2000 | 5.3 mm (0.21 in) |
| 2001 | 17.0 mm (0.7 in) |
| 2002 | 6.9 mm (0.27 in) |
| 2003 | 25.4 mm (1.0 in) |
| 2004 | 32.3 mm (1.3 in) |
| 2005 | 27.5 mm (1.1 in) |
| 2006 | 9.2 mm (0.36 in) |
| 2007 | 18.5 mm (0.7 in) |
| 2008 | 24.9 mm (1.0 in) |
| 2009 | 8.1 mm (0.32 in) |
| 2010 | 53.1 mm (2.1 in) |
| 2011 | 16.3 mm (0.6 in) |
| 2012 | 24.9 mm (1.0 in) |
| 2013 | 24.1 mm (0.9 in) |
| 2014 | 37.1 mm (1.5 in) |
| 2015 | 15.7 mm (0.6 in) |
| 2016 | 21.0 mm (0.8 in) |
| 2017 | 10.2 mm (0.4 in) |
| 2018 | 27.7 mm (1.1 in) |
| 2019 | 11.2 mm (0.4 in) |
| 2020 | 8.7 mm (0.34 in) |
| 2021 | 0.5 mm (0.02 in) |
| 2022 | 27.9 mm (1.1 in) |
| 2023 | 13.2 mm (0.5 in) |
| 2024 | 2.3 mm (0.09 in) |
| 2025 | 15.3 mm (0.6 in) |
| 2026 | 21.3 mm (0.8 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1962 | 162 days |
| 1963 | 141 days |
| 1964 | 241 days |
| 1965 | 221 days |
| 1966 | 176 days |
| 1967 | 137 days |
| 1968 | 156 days |
| 1969 | 195 days |
| 1970 | 173 days |
| 1971 | 116 days |
| 1972 | 279 days |
| 1973 | 157 days |
| 1974 | 200 days |
| 1975 | 107 days |
| 1976 | 101 days |
| 1977 | 142 days |
| 1978 | 104 days |
| 1979 | 137 days |
| 1980 | 183 days |
| 1981 | 82 days |
| 2000 | 69 days |
| 2001 | 299 days |
| 2002 | 329 days |
| 2003 | 163 days |
| 2004 | 200 days |
| 2005 | 139 days |
| 2006 | 208 days |
| 2007 | 212 days |
| 2008 | 215 days |
| 2009 | 293 days |
| 2010 | 144 days |
| 2011 | 161 days |
| 2012 | 134 days |
| 2013 | 179 days |
| 2014 | 213 days |
| 2015 | 165 days |
| 2016 | 162 days |
| 2017 | 150 days |
| 2018 | 272 days |
| 2019 | 203 days |
| 2020 | 265 days |
| 2021 | 217 days |
| 2022 | 131 days |
| 2023 | 123 days |
| 2024 | 138 days |
| 2025 | 69 days |
| 2026 | 269 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
20 years with a frostAcross 20 years with a frost, the median last spring frost at Imperial Co AP falls on 31 January and the median first autumn frost on 16 December, which leaves a median of 322 days between them.
| Measure | Median, all years | Earliest period | Recent period (1963 to 2016) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 31 January | n/a | 31 January | n/a | n/a |
| First autumn frost | 16 December | n/a | 16 December | n/a | n/a |
| Growing days | 322 days | n/a | 322 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
44 years, 1962 to 2025A day with at least 16.2 mm (0.6 in) of rain is expected about once in 2 years. A day with at least 64.6 mm (2.5 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 16.2 mm (0.6 in) | |
| 5 years | 27.4 mm (1.1 in) | |
| 10 years | 35.5 mm (1.4 in) | |
| 25 years | 46.5 mm (1.8 in) | |
| 50 years | 55.3 mm (2.2 in) | Longer than the 44 years of record |
| 100 years | 64.6 mm (2.5 in) | Longer than the 44 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, 44 years of values from 1962 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: 56.4 mm (2.2 in) in 1976; 55.4 mm (2.2 in) in 1977; 39.9 mm (1.6 in) in 1972.
Climate Twins
2008 to 2023 against 1961 to 1990Over 2008 to 2023, Imperial Co AP had a mean temperature of 23.6 C (74.4 F) and 47.6 mm (1.9 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Yuma Proving Ground (United States, 110 km away), Indio Fire STN (United States, 114 km away) and Eagle Mtn (United States, 109 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Yuma Proving Ground | United States | 110 km (68 mi) | 23.0 C (73.5 F) | 92.3 mm (3.6 in) | 0.70 |
| Indio Fire STN | United States | 114 km (71 mi) | 23.1 C (73.5 F) | 79.9 mm (3.1 in) | 0.80 |
| Eagle Mtn | United States | 109 km (68 mi) | 23.0 C (73.4 F) | 89.9 mm (3.5 in) | 0.81 |
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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-15).