Potter Valley Powerhouse Weather Records (USC00047109)
Record envelope, standing records and threshold days for Potter Valley Powerhouse (USC00047109), California, United States, with 90 years of record.
Key Facts for Potter Valley Powerhouse
- Potter Valley Powerhouse (USC00047109) is a weather station in California, United States at 39.36 latitude and -123.13 longitude, 310 m (1,018 ft) above sea level.
- The station reports from 1937 to 2026, 90 years of record.
- 1,464 records set at Potter Valley Powerhouse still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Potter Valley Powerhouse set a daily record high minimum temperature of 14.4 C (57.9 F) 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, 39.36 latitude, -123.13 longitude.
- Elevation: 310 m (1,018 ft).
- Period of record: 1937 to 2026, 90 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
9 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) | -10.0 C (14.0 F) | 23.3 C (73.9 F) | -1.7 C (28.9 F) |
| Feb | 30.6 C (87.1 F) | -9.4 C (15.1 F) | 23.9 C (75.0 F) | 0.6 C (33.1 F) |
| Mar | 34.4 C (93.9 F) | -6.7 C (19.9 F) | 34.4 C (93.9 F) | 3.3 C (37.9 F) |
| Apr | 35.0 C (95.0 F) | -5.6 C (21.9 F) | 28.9 C (84.0 F) | 2.8 C (37.0 F) |
| May | 39.4 C (102.9 F) | -2.2 C (28.0 F) | 33.9 C (93.0 F) | 5.0 C (41.0 F) |
| Jun | 43.3 C (109.9 F) | 0.0 C (32.0 F) | 38.3 C (100.9 F) | 6.1 C (43.0 F) |
| Jul | 45.0 C (113.0 F) | 3.3 C (37.9 F) | 38.3 C (100.9 F) | 9.4 C (48.9 F) |
| Aug | 46.7 C (116.1 F) | 3.9 C (39.0 F) | 41.7 C (107.1 F) | 8.3 C (46.9 F) |
| Sep | 45.0 C (113.0 F) | 0.6 C (33.1 F) | 36.7 C (98.1 F) | 10.0 C (50.0 F) |
| Oct | 39.4 C (102.9 F) | -6.1 C (21.0 F) | 37.8 C (100.0 F) | 10.6 C (51.1 F) |
| Nov | 33.9 C (93.0 F) | -7.2 C (19.0 F) | n/a | n/a |
| Dec | 28.3 C (82.9 F) | -11.1 C (12.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1937 | 9 |
| 1938 | 12 |
| 1939 | 26 |
| 1940 | 8 |
| 1941 | 12 |
| 1942 | 14 |
| 1943 | 14 |
| 1944 | 19 |
| 1945 | 12 |
| 1946 | 17 |
| 1947 | 14 |
| 1948 | 23 |
| 1949 | 27 |
| 1950 | 34 |
| 1951 | 14 |
| 1952 | 20 |
| 1953 | 25 |
| 1954 | 14 |
| 1955 | 25 |
| 1956 | 11 |
| 1957 | 10 |
| 1958 | 15 |
| 1959 | 20 |
| 1960 | 17 |
| 1961 | 20 |
| 1962 | 17 |
| 1963 | 15 |
| 1964 | 37 |
| 1965 | 14 |
| 1966 | 21 |
| 1967 | 21 |
| 1968 | 18 |
| 1969 | 11 |
| 1970 | 12 |
| 1971 | 24 |
| 1972 | 36 |
| 1973 | 10 |
| 1974 | 9 |
| 1975 | 19 |
| 1976 | 15 |
| 1977 | 22 |
| 1978 | 19 |
| 1979 | 10 |
| 1980 | 18 |
| 1981 | 12 |
| 1982 | 23 |
| 1983 | 21 |
| 1984 | 22 |
| 1985 | 26 |
| 1986 | 17 |
| 1987 | 26 |
| 1988 | 10 |
| 1989 | 15 |
| 1990 | 26 |
| 1991 | 8 |
| 1992 | 13 |
| 1993 | 15 |
| 1994 | 12 |
| 1995 | 19 |
| 1996 | 7 |
| 1997 | 9 |
| 1998 | 11 |
| 1999 | 10 |
| 2000 | 10 |
| 2001 | 9 |
| 2002 | 13 |
| 2003 | 11 |
| 2004 | 6 |
| 2005 | 7 |
| 2006 | 15 |
| 2007 | 8 |
| 2008 | 13 |
| 2009 | 15 |
| 2010 | 7 |
| 2011 | 6 |
| 2012 | 17 |
| 2013 | 19 |
| 2014 | 13 |
| 2015 | 14 |
| 2016 | 16 |
| 2017 | 14 |
| 2018 | 12 |
| 2019 | 15 |
| 2020 | 16 |
| 2021 | 13 |
| 2022 | 17 |
| 2023 | 17 |
| 2024 | 21 |
| 2025 | 13 |
| 2026 | 45 |
All-Time Record Progression
7 new records| Date | Kind | Detail |
|---|---|---|
| 1971-01-13 | Record low maximum temperature | Record low maximum temperature 2.2 C (36.0 F) |
| 1971-08-11 | Record high maximum temperature | Record high maximum temperature 45.0 C (113.0 F) |
| 1972-12-08 | Record low maximum temperature | Record low maximum temperature 1.7 C (35.1 F) |
| 1978-08-08 | Record high maximum temperature | Record high maximum temperature 46.7 C (116.1 F) |
| 1988-12-27 | Record low maximum temperature | Record low maximum temperature 0.0 C (32.0 F) |
| 1990-12-21 | Record low minimum temperature | Record low minimum temperature -11.1 C (12.0 F) |
| 2013-07-04 | Record high minimum temperature | Record high minimum temperature 22.2 C (72.0 F) |
Wettest Day of Each Month
Dec: 209.8 mm (8.3 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 143.5 mm (5.6 in) | 16 January 1974 |
| Feb | 129.3 mm (5.1 in) | 17 February 1986 |
| Mar | 87.6 mm (3.4 in) | 23 March 1938 |
| Apr | 88.6 mm (3.5 in) | 6 April 2018 |
| May | 88.6 mm (3.5 in) | 18 May 2005 |
| Jun | 47.0 mm (1.9 in) | 29 June 1992 |
| Jul | 37.6 mm (1.5 in) | 8 July 1974 |
| Aug | 25.4 mm (1.0 in) | 20 August 1997 |
| Sep | 71.6 mm (2.8 in) | 18 September 1959 |
| Oct | 155.4 mm (6.1 in) | 24 October 2010 |
| Nov | 128.0 mm (5.0 in) | 21 November 2024 |
| Dec | 209.8 mm (8.3 in) | 22 December 1964 |
Period of Record Coverage
1937 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1937 | 122 | 33% | No |
| 1938 | 364 | 100% | Yes |
| 1939 | 364 | 100% | Yes |
| 1940 | 366 | 100% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 364 | 100% | Yes |
| 1943 | 361 | 99% | Yes |
| 1944 | 366 | 100% | Yes |
| 1945 | 365 | 100% | Yes |
| 1946 | 363 | 99% | Yes |
| 1947 | 363 | 99% | Yes |
| 1948 | 365 | 100% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 333 | 91% | Yes |
| 1954 | 299 | 82% | No |
| 1955 | 286 | 78% | No |
| 1956 | 290 | 79% | No |
| 1957 | 325 | 89% | No |
| 1958 | 297 | 81% | No |
| 1959 | 249 | 68% | No |
| 1960 | 271 | 74% | No |
| 1961 | 265 | 73% | No |
| 1962 | 270 | 74% | No |
| 1963 | 239 | 65% | No |
| 1964 | 264 | 72% | No |
| 1965 | 262 | 72% | No |
| 1966 | 255 | 70% | No |
| 1967 | 249 | 68% | No |
| 1968 | 328 | 90% | No |
| 1969 | 358 | 98% | Yes |
| 1970 | 363 | 99% | Yes |
| 1971 | 364 | 100% | Yes |
| 1972 | 348 | 95% | Yes |
| 1973 | 302 | 83% | No |
| 1974 | 351 | 96% | Yes |
| 1975 | 359 | 98% | Yes |
| 1976 | 364 | 99% | Yes |
| 1977 | 329 | 90% | Yes |
| 1978 | 353 | 97% | Yes |
| 1979 | 343 | 94% | Yes |
| 1980 | 333 | 91% | Yes |
| 1981 | 335 | 92% | Yes |
| 1982 | 360 | 99% | Yes |
| 1983 | 357 | 98% | Yes |
| 1984 | 363 | 99% | Yes |
| 1985 | 363 | 99% | Yes |
| 1986 | 314 | 86% | No |
| 1987 | 360 | 99% | Yes |
| 1988 | 297 | 81% | No |
| 1989 | 305 | 84% | No |
| 1990 | 361 | 99% | Yes |
| 1991 | 348 | 95% | Yes |
| 1992 | 323 | 88% | No |
| 1993 | 347 | 95% | Yes |
| 1994 | 355 | 97% | Yes |
| 1995 | 341 | 93% | Yes |
| 1996 | 296 | 81% | No |
| 1997 | 293 | 80% | No |
| 1998 | 295 | 81% | No |
| 1999 | 271 | 74% | No |
| 2000 | 293 | 80% | No |
| 2001 | 294 | 81% | No |
| 2002 | 296 | 81% | No |
| 2003 | 353 | 97% | Yes |
| 2004 | 345 | 94% | Yes |
| 2005 | 330 | 90% | Yes |
| 2006 | 350 | 96% | Yes |
| 2007 | 331 | 91% | Yes |
| 2008 | 327 | 89% | No |
| 2009 | 320 | 88% | No |
| 2010 | 350 | 96% | Yes |
| 2011 | 344 | 94% | Yes |
| 2012 | 325 | 89% | No |
| 2013 | 341 | 93% | Yes |
| 2014 | 336 | 92% | Yes |
| 2015 | 345 | 95% | Yes |
| 2016 | 341 | 93% | Yes |
| 2017 | 320 | 88% | No |
| 2018 | 349 | 96% | Yes |
| 2019 | 346 | 95% | Yes |
| 2020 | 347 | 95% | Yes |
| 2021 | 350 | 96% | Yes |
| 2022 | 354 | 97% | Yes |
| 2023 | 364 | 100% | Yes |
| 2024 | 364 | 99% | Yes |
| 2025 | 361 | 99% | Yes |
| 2026 | 283 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 10 October 2026 | Potter Valley Powerhouse, US | daily high min (Provisional) | 14.4 C (57.9 F) | 1.1 C (2.0 F) | 84 years | 37 of 100 (Notable) |
| 9 October 2026 | Potter Valley Powerhouse, US | daily high min (Provisional) | 15.0 C (59.0 F) | 0.6 C (1.1 F) | 67 years | 30 of 100 (Routine) |
| 8 October 2026 | Potter Valley Powerhouse, US | daily high min (Tie, Provisional) | 13.3 C (55.9 F) | tie | 80 years | 8 of 100 (Routine) |
| 7 October 2026 | Potter Valley Powerhouse, US | monthly high min (Tie, Provisional) | 19.4 C (66.9 F) | tie | 0 years | 4 of 100 (Routine) |
| 6 October 2026 | Potter Valley Powerhouse, US | daily high min (Provisional) | 16.1 C (61.0 F) | 1.7 C (3.1 F) | 13 years | 18 of 100 (Routine) |
| 6 October 2026 | Potter Valley Powerhouse, US | daily high max (Provisional) | 37.8 C (100.0 F) | 0.6 C (1.1 F) | 1 year | 10 of 100 (Routine) |
| 5 October 2026 | Potter Valley Powerhouse, US | monthly high min (Provisional) | 19.4 C (66.9 F) | 1.6 C (2.9 F) | 0 years | 23 of 100 (Routine) |
| 5 October 2026 | Potter Valley Powerhouse, US | daily high max (Tie, Provisional) | 37.8 C (100.0 F) | tie | 45 years | 5 of 100 (Routine) |
| 4 October 2026 | Potter Valley Powerhouse, US | monthly high min (Provisional) | 17.8 C (64.0 F) | 2.2 C (4.0 F) | 8 years | 27 of 100 (Routine) |
| 3 October 2026 | Potter Valley Powerhouse, US | monthly high min (Tie, Provisional) | 15.6 C (60.1 F) | tie | 8 years | 5 of 100 (Routine) |
| 1 October 2026 | Potter Valley Powerhouse, US | daily high min (Tie, Provisional) | 14.4 C (57.9 F) | tie | 49 years | 5 of 100 (Routine) |
| 30 September 2026 | Potter Valley Powerhouse, US | daily high min (Provisional) | 17.8 C (64.0 F) | 2.2 C (4.0 F) | 12 years | 20 of 100 (Routine) |
| 24 September 2026 | Potter Valley Powerhouse, US | daily high min (Provisional) | 18.3 C (64.9 F) | 1.1 C (2.0 F) | 44 years | 26 of 100 (Routine) |
| 23 September 2026 | Potter Valley Powerhouse, US | daily high min (Provisional) | 16.7 C (62.1 F) | 1.1 C (2.0 F) | 43 years | 25 of 100 (Routine) |
| 21 September 2026 | Potter Valley Powerhouse, US | daily high min (Provisional) | 17.8 C (64.0 F) | 3.4 C (6.1 F) | 87 years | 47 of 100 (Notable) |
| 11 September 2026 | Potter Valley Powerhouse, US | daily high min (Provisional) | 19.4 C (66.9 F) | 2.7 C (4.9 F) | 72 years | 39 of 100 (Notable) |
| 10 September 2026 | Potter Valley Powerhouse, US | all-time high min (Tie, Provisional) | 22.2 C (72.0 F) | tie | 13 years | 8 of 100 (Routine) |
| 6 September 2026 | Potter Valley Powerhouse, US | daily rain (Provisional) | 0.3 mm (0.01 in) | 0.3 mm (0.01 in) | 88 years | 20 of 100 (Routine) |
| 4 September 2026 | Potter Valley Powerhouse, US | daily low max (Provisional) | 23.9 C (75.0 F) | 0.5 C (0.9 F) | 88 years | 35 of 100 (Notable) |
| 4 September 2026 | Potter Valley Powerhouse, US | daily rain (Provisional) | 0.5 mm (0.02 in) | 0.5 mm (0.02 in) | 88 years | 20 of 100 (Routine) |
Climate Trend
64 complete years, 1938 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1938 | 14.5 C | -0.25 C |
| 1939 | 14.8 C | +0.04 C |
| 1940 | 15.4 C | +0.63 C |
| 1941 | 14.9 C | +0.17 C |
| 1942 | 14.5 C | -0.25 C |
| 1943 | 15.0 C | +0.28 C |
| 1944 | 14.8 C | +0.03 C |
| 1945 | 15.0 C | +0.25 C |
| 1946 | 14.3 C | -0.43 C |
| 1947 | 14.9 C | +0.20 C |
| 1948 | 13.4 C | -1.34 C |
| 1949 | 14.4 C | -0.29 C |
| 1950 | 15.0 C | +0.28 C |
| 1951 | 14.8 C | +0.05 C |
| 1952 | 14.6 C | -0.09 C |
| 1953 | 14.2 C | -0.54 C |
| 1957 | 14.1 C | -0.63 C |
| 1958 | 15.6 C | +0.88 C |
| 1962 | 14.5 C | -0.22 C |
| 1964 | 13.9 C | -0.84 C |
| 1968 | 14.5 C | -0.21 C |
| 1969 | 14.9 C | +0.14 C |
| 1970 | 15.3 C | +0.54 C |
| 1971 | 14.3 C | -0.44 C |
| 1974 | 14.8 C | +0.03 C |
| 1975 | 14.2 C | -0.52 C |
| 1976 | 14.5 C | -0.23 C |
| 1978 | 15.2 C | +0.44 C |
| 1979 | 14.5 C | -0.24 C |
| 1982 | 13.9 C | -0.81 C |
| 1983 | 14.2 C | -0.52 C |
| 1984 | 14.2 C | -0.55 C |
| 1985 | 14.2 C | -0.56 C |
| 1987 | 14.4 C | -0.36 C |
| 1990 | 13.7 C | -1.01 C |
| 1991 | 14.3 C | -0.40 C |
| 1992 | 14.7 C | 0.00 C |
| 1993 | 13.5 C | -1.21 C |
| 1994 | 13.5 C | -1.21 C |
| 1995 | 14.5 C | -0.21 C |
| 1996 | 15.0 C | +0.28 C |
| 1997 | 14.8 C | +0.02 C |
| 1998 | 13.9 C | -0.88 C |
| 2000 | 14.6 C | -0.18 C |
| 2003 | 14.9 C | +0.13 C |
| 2004 | 15.0 C | +0.30 C |
| 2005 | 14.7 C | -0.08 C |
| 2006 | 14.5 C | -0.20 C |
| 2007 | 14.0 C | -0.77 C |
| 2010 | 14.4 C | -0.35 C |
| 2011 | 14.2 C | -0.51 C |
| 2012 | 14.8 C | +0.08 C |
| 2013 | 15.1 C | +0.33 C |
| 2014 | 16.2 C | +1.47 C |
| 2015 | 16.2 C | +1.49 C |
| 2016 | 15.7 C | +0.95 C |
| 2018 | 15.6 C | +0.85 C |
| 2019 | 15.5 C | +0.78 C |
| 2020 | 16.1 C | +1.37 C |
| 2021 | 16.0 C | +1.30 C |
| 2022 | 15.3 C | +0.60 C |
| 2023 | 14.9 C | +0.15 C |
| 2024 | 15.8 C | +1.11 C |
| 2025 | 15.9 C | +1.21 C |
The annual mean temperature here has risen by 0.08 C (0.02 to 0.14) per decade over 1938 to 2025. In Fahrenheit: 0.14 F (0.04 to 0.25) per decade. The slope is a straight line fitted to 64 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 (0.02 to 0.14) per decade | 0.14 F (0.04 to 0.25) per decade | 1938 to 2025 | 64 | Rise |
| Mean daily maximum | 0.04 C (-0.06 to 0.13) per decade | 0.1 F (-0.1 to 0.2) per decade | 1938 to 2025 | 64 | Not clearly different from zero |
| Mean daily minimum | 0.1 C (0.1 to 0.2) per decade | 0.2 F (0.1 to 0.3) per decade | 1938 to 2025 | 64 | 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
1937 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 46.7 C (116.1 F) | 1978 | 41.1 C (106.0 F) | 90 |
| Coldest night (TNn) | -11.1 C (12.0 F) | 1990 | -5.6 C (21.9 F) | 90 |
| Wettest day (Rx1day) | 209.8 mm (8.3 in) | 1964 | 81.5 mm (3.2 in) | 90 |
| Wettest five days (Rx5day) | 428.7 mm (16.9 in) | 1964 | 179.3 mm (7.1 in) | 90 |
| Longest dry spell (CDD) | 169 days | 2002 | 85 days | 90 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1937 | 40.6 C (105.1 F) |
| 1938 | 42.2 C (108.0 F) |
| 1939 | 41.7 C (107.1 F) |
| 1940 | 40.6 C (105.1 F) |
| 1941 | 41.1 C (106.0 F) |
| 1942 | 42.8 C (109.0 F) |
| 1943 | 41.1 C (106.0 F) |
| 1944 | 42.2 C (108.0 F) |
| 1945 | 41.1 C (106.0 F) |
| 1946 | 41.1 C (106.0 F) |
| 1947 | 40.0 C (104.0 F) |
| 1948 | 40.6 C (105.1 F) |
| 1949 | 40.0 C (104.0 F) |
| 1950 | 43.9 C (111.0 F) |
| 1951 | 40.6 C (105.1 F) |
| 1952 | 41.1 C (106.0 F) |
| 1953 | 41.1 C (106.0 F) |
| 1954 | 40.0 C (104.0 F) |
| 1955 | 43.3 C (109.9 F) |
| 1956 | 41.1 C (106.0 F) |
| 1957 | 41.1 C (106.0 F) |
| 1958 | 41.1 C (106.0 F) |
| 1959 | 41.7 C (107.1 F) |
| 1960 | 42.2 C (108.0 F) |
| 1961 | 43.3 C (109.9 F) |
| 1962 | 40.6 C (105.1 F) |
| 1963 | 39.4 C (102.9 F) |
| 1964 | 42.2 C (108.0 F) |
| 1965 | 38.9 C (102.0 F) |
| 1966 | 42.2 C (108.0 F) |
| 1967 | 40.6 C (105.1 F) |
| 1968 | 40.0 C (104.0 F) |
| 1969 | 40.6 C (105.1 F) |
| 1970 | 41.7 C (107.1 F) |
| 1971 | 45.0 C (113.0 F) |
| 1972 | 45.0 C (113.0 F) |
| 1973 | 42.8 C (109.0 F) |
| 1974 | 41.1 C (106.0 F) |
| 1975 | 41.7 C (107.1 F) |
| 1976 | 40.6 C (105.1 F) |
| 1977 | 42.8 C (109.0 F) |
| 1978 | 46.7 C (116.1 F) |
| 1979 | 40.6 C (105.1 F) |
| 1980 | 39.4 C (102.9 F) |
| 1981 | 44.4 C (111.9 F) |
| 1982 | 40.6 C (105.1 F) |
| 1983 | 40.0 C (104.0 F) |
| 1984 | 41.7 C (107.1 F) |
| 1985 | 41.7 C (107.1 F) |
| 1986 | 38.3 C (100.9 F) |
| 1987 | 41.7 C (107.1 F) |
| 1988 | 42.8 C (109.0 F) |
| 1989 | 37.8 C (100.0 F) |
| 1990 | 42.2 C (108.0 F) |
| 1991 | 42.2 C (108.0 F) |
| 1992 | 40.6 C (105.1 F) |
| 1993 | 39.4 C (102.9 F) |
| 1994 | 38.3 C (100.9 F) |
| 1995 | 38.9 C (102.0 F) |
| 1996 | 40.6 C (105.1 F) |
| 1997 | 39.4 C (102.9 F) |
| 1998 | 41.7 C (107.1 F) |
| 1999 | 41.1 C (106.0 F) |
| 2000 | 40.6 C (105.1 F) |
| 2001 | 40.6 C (105.1 F) |
| 2002 | 42.8 C (109.0 F) |
| 2003 | 41.1 C (106.0 F) |
| 2004 | 38.3 C (100.9 F) |
| 2005 | 41.7 C (107.1 F) |
| 2006 | 43.3 C (109.9 F) |
| 2007 | 41.1 C (106.0 F) |
| 2008 | 41.7 C (107.1 F) |
| 2009 | 40.6 C (105.1 F) |
| 2010 | 41.7 C (107.1 F) |
| 2011 | 40.0 C (104.0 F) |
| 2012 | 41.1 C (106.0 F) |
| 2013 | 42.2 C (108.0 F) |
| 2014 | 41.1 C (106.0 F) |
| 2015 | 41.1 C (106.0 F) |
| 2016 | 41.7 C (107.1 F) |
| 2017 | 42.8 C (109.0 F) |
| 2018 | 41.7 C (107.1 F) |
| 2019 | 41.1 C (106.0 F) |
| 2020 | 43.3 C (109.9 F) |
| 2021 | 44.4 C (111.9 F) |
| 2022 | 45.0 C (113.0 F) |
| 2023 | 42.2 C (108.0 F) |
| 2024 | 44.4 C (111.9 F) |
| 2025 | 40.0 C (104.0 F) |
| 2026 | 41.7 C (107.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1937 | -3.9 C (25.0 F) |
| 1938 | -5.0 C (23.0 F) |
| 1939 | -9.4 C (15.1 F) |
| 1940 | -8.3 C (17.1 F) |
| 1941 | -3.9 C (25.0 F) |
| 1942 | -5.0 C (23.0 F) |
| 1943 | -8.3 C (17.1 F) |
| 1944 | -4.4 C (24.1 F) |
| 1945 | -5.6 C (21.9 F) |
| 1946 | -5.0 C (23.0 F) |
| 1947 | -6.1 C (21.0 F) |
| 1948 | -7.2 C (19.0 F) |
| 1949 | -10.0 C (14.0 F) |
| 1950 | -7.8 C (18.0 F) |
| 1951 | -5.6 C (21.9 F) |
| 1952 | -5.6 C (21.9 F) |
| 1953 | -6.7 C (19.9 F) |
| 1954 | -5.6 C (21.9 F) |
| 1955 | -5.6 C (21.9 F) |
| 1956 | -6.1 C (21.0 F) |
| 1957 | -6.7 C (19.9 F) |
| 1958 | -5.6 C (21.9 F) |
| 1959 | -5.6 C (21.9 F) |
| 1960 | -8.3 C (17.1 F) |
| 1961 | -7.2 C (19.0 F) |
| 1962 | -7.8 C (18.0 F) |
| 1963 | -8.3 C (17.1 F) |
| 1964 | -5.6 C (21.9 F) |
| 1965 | -7.8 C (18.0 F) |
| 1966 | -6.1 C (21.0 F) |
| 1967 | -7.2 C (19.0 F) |
| 1968 | -8.9 C (16.0 F) |
| 1969 | -4.4 C (24.1 F) |
| 1970 | -5.0 C (23.0 F) |
| 1971 | -6.1 C (21.0 F) |
| 1972 | -10.0 C (14.0 F) |
| 1973 | -7.2 C (19.0 F) |
| 1974 | -5.6 C (21.9 F) |
| 1975 | -7.8 C (18.0 F) |
| 1976 | -6.7 C (19.9 F) |
| 1977 | -5.6 C (21.9 F) |
| 1978 | -7.2 C (19.0 F) |
| 1979 | -6.7 C (19.9 F) |
| 1980 | -6.1 C (21.0 F) |
| 1981 | -3.3 C (26.1 F) |
| 1982 | -4.4 C (24.1 F) |
| 1983 | -2.8 C (27.0 F) |
| 1984 | -4.4 C (24.1 F) |
| 1985 | -5.6 C (21.9 F) |
| 1986 | -4.4 C (24.1 F) |
| 1987 | -8.3 C (17.1 F) |
| 1988 | -5.6 C (21.9 F) |
| 1989 | -5.6 C (21.9 F) |
| 1990 | -11.1 C (12.0 F) |
| 1991 | -7.2 C (19.0 F) |
| 1992 | -5.0 C (23.0 F) |
| 1993 | -6.7 C (19.9 F) |
| 1994 | -5.6 C (21.9 F) |
| 1995 | -3.9 C (25.0 F) |
| 1996 | -5.0 C (23.0 F) |
| 1997 | -5.6 C (21.9 F) |
| 1998 | -8.9 C (16.0 F) |
| 1999 | -5.6 C (21.9 F) |
| 2000 | -4.4 C (24.1 F) |
| 2001 | -6.1 C (21.0 F) |
| 2002 | -6.1 C (21.0 F) |
| 2003 | -5.0 C (23.0 F) |
| 2004 | -5.0 C (23.0 F) |
| 2005 | -5.0 C (23.0 F) |
| 2006 | -5.6 C (21.9 F) |
| 2007 | -9.4 C (15.1 F) |
| 2008 | -6.7 C (19.9 F) |
| 2009 | -8.9 C (16.0 F) |
| 2010 | -6.1 C (21.0 F) |
| 2011 | -6.7 C (19.9 F) |
| 2012 | -7.8 C (18.0 F) |
| 2013 | -9.4 C (15.1 F) |
| 2014 | -5.6 C (21.9 F) |
| 2015 | -7.2 C (19.0 F) |
| 2016 | -5.6 C (21.9 F) |
| 2017 | -5.0 C (23.0 F) |
| 2018 | -6.1 C (21.0 F) |
| 2019 | -5.0 C (23.0 F) |
| 2020 | -5.0 C (23.0 F) |
| 2021 | -5.0 C (23.0 F) |
| 2022 | -6.7 C (19.9 F) |
| 2023 | -5.6 C (21.9 F) |
| 2024 | -4.4 C (24.1 F) |
| 2025 | -3.9 C (25.0 F) |
| 2026 | -1.7 C (28.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1937 | 132.6 mm (5.2 in) |
| 1938 | 87.6 mm (3.4 in) |
| 1939 | 52.3 mm (2.1 in) |
| 1940 | 85.1 mm (3.4 in) |
| 1941 | 73.7 mm (2.9 in) |
| 1942 | 59.4 mm (2.3 in) |
| 1943 | 110.7 mm (4.4 in) |
| 1944 | 50.8 mm (2.0 in) |
| 1945 | 106.2 mm (4.2 in) |
| 1946 | 59.9 mm (2.4 in) |
| 1947 | 59.2 mm (2.3 in) |
| 1948 | 74.9 mm (2.9 in) |
| 1949 | 48.3 mm (1.9 in) |
| 1950 | 80.5 mm (3.2 in) |
| 1951 | 85.1 mm (3.4 in) |
| 1952 | 81.0 mm (3.2 in) |
| 1953 | 70.1 mm (2.8 in) |
| 1954 | 104.1 mm (4.1 in) |
| 1955 | 148.3 mm (5.8 in) |
| 1956 | 101.6 mm (4.0 in) |
| 1957 | 69.6 mm (2.7 in) |
| 1958 | 97.3 mm (3.8 in) |
| 1959 | 71.6 mm (2.8 in) |
| 1960 | 98.8 mm (3.9 in) |
| 1961 | 61.7 mm (2.4 in) |
| 1962 | 83.8 mm (3.3 in) |
| 1963 | 89.7 mm (3.5 in) |
| 1964 | 209.8 mm (8.3 in) |
| 1965 | 72.9 mm (2.9 in) |
| 1966 | 107.7 mm (4.2 in) |
| 1967 | 92.5 mm (3.6 in) |
| 1968 | 105.7 mm (4.2 in) |
| 1969 | 112.3 mm (4.4 in) |
| 1970 | 82.0 mm (3.2 in) |
| 1971 | 106.2 mm (4.2 in) |
| 1972 | 71.1 mm (2.8 in) |
| 1973 | 63.5 mm (2.5 in) |
| 1974 | 143.5 mm (5.6 in) |
| 1975 | 74.9 mm (2.9 in) |
| 1976 | 45.2 mm (1.8 in) |
| 1977 | 80.0 mm (3.1 in) |
| 1978 | 68.8 mm (2.7 in) |
| 1979 | 120.9 mm (4.8 in) |
| 1980 | 82.3 mm (3.2 in) |
| 1981 | 79.8 mm (3.1 in) |
| 1982 | 76.2 mm (3.0 in) |
| 1983 | 69.9 mm (2.8 in) |
| 1984 | 47.0 mm (1.9 in) |
| 1985 | 71.6 mm (2.8 in) |
| 1986 | 129.3 mm (5.1 in) |
| 1987 | 56.4 mm (2.2 in) |
| 1988 | 76.2 mm (3.0 in) |
| 1989 | 50.8 mm (2.0 in) |
| 1990 | 100.1 mm (3.9 in) |
| 1991 | 61.0 mm (2.4 in) |
| 1992 | 89.7 mm (3.5 in) |
| 1993 | 138.9 mm (5.5 in) |
| 1994 | 50.0 mm (2.0 in) |
| 1995 | 116.8 mm (4.6 in) |
| 1996 | 70.1 mm (2.8 in) |
| 1997 | 109.2 mm (4.3 in) |
| 1998 | 69.3 mm (2.7 in) |
| 1999 | 58.4 mm (2.3 in) |
| 2000 | 42.2 mm (1.7 in) |
| 2001 | 59.7 mm (2.4 in) |
| 2002 | 100.6 mm (4.0 in) |
| 2003 | 87.9 mm (3.5 in) |
| 2004 | 102.4 mm (4.0 in) |
| 2005 | 113.3 mm (4.5 in) |
| 2006 | 57.9 mm (2.3 in) |
| 2007 | 54.1 mm (2.1 in) |
| 2008 | 78.7 mm (3.1 in) |
| 2009 | 63.0 mm (2.5 in) |
| 2010 | 155.4 mm (6.1 in) |
| 2011 | 54.6 mm (2.1 in) |
| 2012 | 89.7 mm (3.5 in) |
| 2013 | 47.5 mm (1.9 in) |
| 2014 | 104.9 mm (4.1 in) |
| 2015 | 71.1 mm (2.8 in) |
| 2016 | 82.8 mm (3.3 in) |
| 2017 | 89.4 mm (3.5 in) |
| 2018 | 88.6 mm (3.5 in) |
| 2019 | 84.6 mm (3.3 in) |
| 2020 | 37.1 mm (1.5 in) |
| 2021 | 149.4 mm (5.9 in) |
| 2022 | 104.9 mm (4.1 in) |
| 2023 | 56.1 mm (2.2 in) |
| 2024 | 128.0 mm (5.0 in) |
| 2025 | 98.0 mm (3.9 in) |
| 2026 | 98.8 mm (3.9 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1937 | 274.8 mm (10.8 in) |
| 1938 | 179.2 mm (7.1 in) |
| 1939 | 103.3 mm (4.1 in) |
| 1940 | 226.8 mm (8.9 in) |
| 1941 | 234.2 mm (9.2 in) |
| 1942 | 219.1 mm (8.6 in) |
| 1943 | 274.2 mm (10.8 in) |
| 1944 | 133.9 mm (5.3 in) |
| 1945 | 209.7 mm (8.3 in) |
| 1946 | 157.5 mm (6.2 in) |
| 1947 | 98.3 mm (3.9 in) |
| 1948 | 120.9 mm (4.8 in) |
| 1949 | 107.5 mm (4.2 in) |
| 1950 | 159.5 mm (6.3 in) |
| 1951 | 195.4 mm (7.7 in) |
| 1952 | 227.1 mm (8.9 in) |
| 1953 | 154.3 mm (6.1 in) |
| 1954 | 192.8 mm (7.6 in) |
| 1955 | 340.0 mm (13.4 in) |
| 1956 | 238.7 mm (9.4 in) |
| 1957 | 141.5 mm (5.6 in) |
| 1958 | 176.3 mm (6.9 in) |
| 1959 | 124.5 mm (4.9 in) |
| 1960 | 231.9 mm (9.1 in) |
| 1961 | 128.8 mm (5.1 in) |
| 1962 | 241.8 mm (9.5 in) |
| 1963 | 197.9 mm (7.8 in) |
| 1964 | 428.7 mm (16.9 in) |
| 1965 | 175.5 mm (6.9 in) |
| 1966 | 225.9 mm (8.9 in) |
| 1967 | 175.6 mm (6.9 in) |
| 1968 | 205.5 mm (8.1 in) |
| 1969 | 228.1 mm (9.0 in) |
| 1970 | 271.2 mm (10.7 in) |
| 1971 | 193.9 mm (7.6 in) |
| 1972 | 127.5 mm (5.0 in) |
| 1973 | 189.2 mm (7.4 in) |
| 1974 | 243.3 mm (9.6 in) |
| 1975 | 180.4 mm (7.1 in) |
| 1976 | 153.5 mm (6.0 in) |
| 1977 | 113.0 mm (4.4 in) |
| 1978 | 179.3 mm (7.1 in) |
| 1979 | 177.3 mm (7.0 in) |
| 1980 | 185.0 mm (7.3 in) |
| 1981 | 191.5 mm (7.5 in) |
| 1982 | 196.0 mm (7.7 in) |
| 1983 | 184.4 mm (7.3 in) |
| 1984 | 139.1 mm (5.5 in) |
| 1985 | 120.2 mm (4.7 in) |
| 1986 | 308.4 mm (12.1 in) |
| 1987 | 160.8 mm (6.3 in) |
| 1988 | 150.3 mm (5.9 in) |
| 1989 | 112.4 mm (4.4 in) |
| 1990 | 143.0 mm (5.6 in) |
| 1991 | 170.0 mm (6.7 in) |
| 1992 | 182.1 mm (7.2 in) |
| 1993 | 186.0 mm (7.3 in) |
| 1994 | 105.2 mm (4.1 in) |
| 1995 | 280.9 mm (11.1 in) |
| 1996 | 172.9 mm (6.8 in) |
| 1997 | 262.9 mm (10.4 in) |
| 1998 | 193.1 mm (7.6 in) |
| 1999 | 172.2 mm (6.8 in) |
| 2000 | 138.7 mm (5.5 in) |
| 2001 | 147.1 mm (5.8 in) |
| 2002 | 283.1 mm (11.1 in) |
| 2003 | 122.0 mm (4.8 in) |
| 2004 | 171.7 mm (6.8 in) |
| 2005 | 158.0 mm (6.2 in) |
| 2006 | 130.5 mm (5.1 in) |
| 2007 | 143.2 mm (5.6 in) |
| 2008 | 156.2 mm (6.1 in) |
| 2009 | 84.7 mm (3.3 in) |
| 2010 | 205.2 mm (8.1 in) |
| 2011 | 148.3 mm (5.8 in) |
| 2012 | 227.6 mm (9.0 in) |
| 2013 | 58.4 mm (2.3 in) |
| 2014 | 210.0 mm (8.3 in) |
| 2015 | 193.0 mm (7.6 in) |
| 2016 | 160.3 mm (6.3 in) |
| 2017 | 207.8 mm (8.2 in) |
| 2018 | 116.9 mm (4.6 in) |
| 2019 | 197.6 mm (7.8 in) |
| 2020 | 53.1 mm (2.1 in) |
| 2021 | 214.7 mm (8.5 in) |
| 2022 | 187.9 mm (7.4 in) |
| 2023 | 137.7 mm (5.4 in) |
| 2024 | 277.7 mm (10.9 in) |
| 2025 | 195.6 mm (7.7 in) |
| 2026 | 134.9 mm (5.3 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1937 | 30 days |
| 1938 | 118 days |
| 1939 | 110 days |
| 1940 | 73 days |
| 1941 | 65 days |
| 1942 | 102 days |
| 1943 | 137 days |
| 1944 | 117 days |
| 1945 | 114 days |
| 1946 | 59 days |
| 1947 | 120 days |
| 1948 | 101 days |
| 1949 | 70 days |
| 1950 | 92 days |
| 1951 | 141 days |
| 1952 | 110 days |
| 1953 | 79 days |
| 1954 | 77 days |
| 1955 | 137 days |
| 1956 | 113 days |
| 1957 | 73 days |
| 1958 | 49 days |
| 1959 | 75 days |
| 1960 | 131 days |
| 1961 | 103 days |
| 1962 | 72 days |
| 1963 | 79 days |
| 1964 | 90 days |
| 1965 | 69 days |
| 1966 | 140 days |
| 1967 | 119 days |
| 1968 | 85 days |
| 1969 | 109 days |
| 1970 | 125 days |
| 1971 | 64 days |
| 1972 | 66 days |
| 1973 | 68 days |
| 1974 | 91 days |
| 1975 | 51 days |
| 1976 | 65 days |
| 1977 | 90 days |
| 1978 | 68 days |
| 1979 | 117 days |
| 1980 | 47 days |
| 1981 | 80 days |
| 1982 | 66 days |
| 1983 | 49 days |
| 1984 | 77 days |
| 1985 | 81 days |
| 1986 | 108 days |
| 1987 | 143 days |
| 1988 | 43 days |
| 1989 | 77 days |
| 1990 | 114 days |
| 1991 | 117 days |
| 1992 | 46 days |
| 1993 | 120 days |
| 1994 | 98 days |
| 1995 | 112 days |
| 1996 | 80 days |
| 1997 | 76 days |
| 1998 | 119 days |
| 1999 | 80 days |
| 2000 | 107 days |
| 2001 | 157 days |
| 2002 | 169 days |
| 2003 | 84 days |
| 2004 | 101 days |
| 2005 | 118 days |
| 2006 | 113 days |
| 2007 | 67 days |
| 2008 | 116 days |
| 2009 | 118 days |
| 2010 | 106 days |
| 2011 | 64 days |
| 2012 | 41 days |
| 2013 | 28 days |
| 2014 | 28 days |
| 2015 | 42 days |
| 2016 | 32 days |
| 2017 | 54 days |
| 2018 | 40 days |
| 2019 | 36 days |
| 2020 | 30 days |
| 2021 | 80 days |
| 2022 | 57 days |
| 2023 | 140 days |
| 2024 | 110 days |
| 2025 | 129 days |
| 2026 | 87 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
64 years with a frostAcross 64 years with a frost, the median last spring frost at Potter Valley Powerhouse falls on 13 April and the median first autumn frost on 3 November, which leaves a median of 203 days between them.
In 1990 to 2025 the median growing season was 210 days. That is 18 days more than in 1938 to 1982.
Fitted over all years, the growing season changes by +3.5 days per decade at this station.
| Measure | Median, all years | Earliest period (1938 to 1982) | Recent period (1990 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 13 April | 25 April | 5 April | 20 days earlier | -3.2 days per decade |
| First autumn frost | 3 November | 3 November | 2 November | 1 day earlier | +0.3 days per decade |
| Growing days | 203 days | 192 days | 210 days | 18 days more | +3.5 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
82 years, 1938 to 2025A day with at least 80.4 mm (3.2 in) of rain is expected about once in 2 years. A day with at least 182.1 mm (7.2 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 80.4 mm (3.2 in) | |
| 5 years | 107.1 mm (4.2 in) | |
| 10 years | 125.0 mm (4.9 in) | |
| 25 years | 147.9 mm (5.8 in) | |
| 50 years | 165.0 mm (6.5 in) | |
| 100 years | 182.1 mm (7.2 in) | Longer than the 82 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, 82 years of values from 1938 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: 209.8 mm (8.3 in) in 1964; 155.4 mm (6.1 in) in 2010; 149.4 mm (5.9 in) in 2021.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Potter Valley Powerhouse, at 1984. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1984 ran 0.5 C (0.9 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1984 | -0.5 | -0.9 | 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.
Climate Twins
2010 to 2025 against 1961 to 1990Over 2010 to 2025, Potter Valley Powerhouse had a mean temperature of 15.5 C (59.8 F) and 1,029.5 mm (40.5 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Auburn (United States, 183 km away), Colfax (United States, 190 km away) and Zadar (Croatia, 9,835 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Auburn | United States | 183 km (114 mi) | 15.6 C (60.0 F) | 856.5 mm (33.7 in) | 0.98 |
| Colfax | United States | 190 km (118 mi) | 14.9 C (58.8 F) | 1,148.9 mm (45.2 in) | 0.99 |
| Zadar | Croatia | 9,835 km (6,111 mi) | 14.8 C (58.7 F) | 916.3 mm (36.1 in) | 1.09 |
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).