Callao Weather Records (USC00421144)
Record envelope, standing records and threshold days for Callao (USC00421144), Utah, United States, with 125 years of record.
Key Facts for Callao
- Callao (USC00421144) is a weather station in Utah, United States at 39.90 latitude and -113.71 longitude, 1,323 m (4,342 ft) above sea level.
- The station reports from 1902 to 2026, 125 years of record.
- 1,464 records set at Callao still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Callao set a monthly record daily precipitation of 44.2 mm (1.7 in) on 12 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Utah, United States, 39.90 latitude, -113.71 longitude.
- Elevation: 1,323 m (4,342 ft).
- Period of record: 1902 to 2026, 125 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
20 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 20.6 C (69.1 F) | -31.1 C (-24.0 F) | 13.9 C (57.0 F) | -15.0 C (5.0 F) |
| Feb | 30.0 C (86.0 F) | -30.6 C (-23.1 F) | 22.8 C (73.0 F) | -10.6 C (12.9 F) |
| Mar | 32.8 C (91.0 F) | -16.7 C (1.9 F) | 32.8 C (91.0 F) | -7.8 C (18.0 F) |
| Apr | 31.7 C (89.1 F) | -13.3 C (8.1 F) | 27.8 C (82.0 F) | -6.7 C (19.9 F) |
| May | 35.6 C (96.1 F) | -7.2 C (19.0 F) | 33.3 C (91.9 F) | -0.6 C (30.9 F) |
| Jun | 37.8 C (100.0 F) | -1.1 C (30.0 F) | 35.6 C (96.1 F) | 5.0 C (41.0 F) |
| Jul | 40.0 C (104.0 F) | 2.2 C (36.0 F) | 38.9 C (102.0 F) | 7.8 C (46.0 F) |
| Aug | 41.1 C (106.0 F) | -2.2 C (28.0 F) | 38.3 C (100.9 F) | 10.6 C (51.1 F) |
| Sep | 37.2 C (99.0 F) | -6.7 C (19.9 F) | 33.9 C (93.0 F) | 4.4 C (39.9 F) |
| Oct | 32.2 C (90.0 F) | -16.7 C (1.9 F) | 31.7 C (89.1 F) | 6.1 C (43.0 F) |
| Nov | 25.0 C (77.0 F) | -18.9 C (-2.0 F) | n/a | n/a |
| Dec | 22.8 C (73.0 F) | -30.6 C (-23.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1902 | 5 |
| 1903 | 36 |
| 1904 | 31 |
| 1905 | 8 |
| 1962 | 21 |
| 1963 | 21 |
| 1964 | 68 |
| 1965 | 32 |
| 1966 | 19 |
| 1967 | 21 |
| 1968 | 23 |
| 1969 | 31 |
| 1970 | 30 |
| 1971 | 18 |
| 1972 | 37 |
| 1973 | 24 |
| 1974 | 11 |
| 1975 | 21 |
| 1976 | 20 |
| 1977 | 33 |
| 1978 | 20 |
| 1979 | 33 |
| 1980 | 15 |
| 1981 | 8 |
| 1982 | 23 |
| 1983 | 17 |
| 1984 | 24 |
| 1985 | 26 |
| 1986 | 20 |
| 1987 | 22 |
| 1988 | 16 |
| 1989 | 31 |
| 1990 | 38 |
| 1991 | 11 |
| 1992 | 19 |
| 1993 | 17 |
| 1994 | 20 |
| 1995 | 19 |
| 1996 | 14 |
| 1997 | 12 |
| 1998 | 12 |
| 1999 | 18 |
| 2000 | 20 |
| 2001 | 25 |
| 2002 | 17 |
| 2003 | 40 |
| 2004 | 11 |
| 2005 | 8 |
| 2006 | 24 |
| 2007 | 17 |
| 2008 | 15 |
| 2009 | 22 |
| 2010 | 18 |
| 2011 | 20 |
| 2012 | 21 |
| 2013 | 42 |
| 2014 | 21 |
| 2015 | 22 |
| 2016 | 15 |
| 2017 | 21 |
| 2018 | 9 |
| 2019 | 16 |
| 2020 | 15 |
| 2021 | 19 |
| 2022 | 17 |
| 2023 | 10 |
| 2024 | 11 |
| 2025 | 26 |
| 2026 | 17 |
All-Time Record Progression
10 new records| Date | Kind | Detail |
|---|---|---|
| 1982-09-27 | Record daily precipitation | Record daily precipitation 53.8 mm (2.1 in) |
| 1988-01-06 | Record snow depth | Record snow depth 30.5 cm (12.0 in) |
| 1990-07-02 | Record high minimum temperature | Record high minimum temperature 25.0 C (77.0 F) |
| 1993-01-09 | Record snow depth | Record snow depth 33.0 cm (13.0 in) |
| 1993-01-10 | Record snow depth | Record snow depth 40.6 cm (16.0 in) |
| 1993-01-11 | Record snow depth | Record snow depth 45.7 cm (18.0 in) |
| 1994-07-28 | Record high maximum temperature | Record high maximum temperature 38.9 C (102.0 F) |
| 2000-08-01 | Record high maximum temperature | Record high maximum temperature 40.0 C (104.0 F) |
| 2000-08-02 | Record high maximum temperature | Record high maximum temperature 41.1 C (106.0 F) |
| 2013-01-06 | Record low maximum temperature | Record low maximum temperature -17.2 C (1.0 F) |
Wettest Day of Each Month
Sep: 53.8 mm (2.1 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 39.1 mm (1.5 in) | 31 January 1993 |
| Feb | 30.5 mm (1.2 in) | 12 February 1949 |
| Mar | 23.1 mm (0.9 in) | 28 March 1998 |
| Apr | 35.8 mm (1.4 in) | 8 April 2011 |
| May | 38.4 mm (1.5 in) | 12 May 1989 |
| Jun | 42.4 mm (1.7 in) | 1 June 1991 |
| Jul | 25.4 mm (1.0 in) | 27 July 2019 |
| Aug | 35.8 mm (1.4 in) | 18 August 1983 |
| Sep | 53.8 mm (2.1 in) | 27 September 1982 |
| Oct | 30.7 mm (1.2 in) | 20 October 2009 |
| Nov | 28.7 mm (1.1 in) | 12 November 2004 |
| Dec | 17.8 mm (0.7 in) | 17 December 1970 |
Period of Record Coverage
1902 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1902 | 57 | 16% | No |
| 1903 | 268 | 73% | No |
| 1904 | 362 | 99% | Yes |
| 1905 | 56 | 15% | No |
| 1962 | 223 | 61% | No |
| 1963 | 359 | 98% | Yes |
| 1964 | 356 | 97% | Yes |
| 1965 | 360 | 99% | Yes |
| 1966 | 360 | 99% | Yes |
| 1967 | 361 | 99% | Yes |
| 1968 | 360 | 98% | Yes |
| 1969 | 360 | 99% | Yes |
| 1970 | 362 | 99% | Yes |
| 1971 | 357 | 98% | Yes |
| 1972 | 356 | 97% | Yes |
| 1973 | 353 | 97% | Yes |
| 1974 | 347 | 95% | Yes |
| 1975 | 352 | 96% | Yes |
| 1976 | 344 | 94% | Yes |
| 1977 | 337 | 92% | Yes |
| 1978 | 345 | 95% | Yes |
| 1979 | 345 | 95% | Yes |
| 1980 | 342 | 93% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 362 | 99% | Yes |
| 1983 | 358 | 98% | Yes |
| 1984 | 363 | 99% | Yes |
| 1985 | 355 | 97% | Yes |
| 1986 | 363 | 99% | Yes |
| 1987 | 355 | 97% | Yes |
| 1988 | 356 | 97% | Yes |
| 1989 | 347 | 95% | Yes |
| 1990 | 362 | 99% | Yes |
| 1991 | 363 | 99% | Yes |
| 1992 | 362 | 99% | Yes |
| 1993 | 362 | 99% | Yes |
| 1994 | 362 | 99% | Yes |
| 1995 | 358 | 98% | Yes |
| 1996 | 334 | 91% | Yes |
| 1997 | 365 | 100% | Yes |
| 1998 | 335 | 92% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 365 | 100% | Yes |
| 2001 | 365 | 100% | Yes |
| 2002 | 364 | 100% | Yes |
| 2003 | 363 | 99% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 361 | 99% | Yes |
| 2007 | 363 | 99% | Yes |
| 2008 | 364 | 99% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 363 | 99% | Yes |
| 2014 | 364 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 365 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 364 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 365 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 284 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 12 October 2026 | Callao, US | monthly rain (Provisional) | 44.2 mm (1.7 in) | 13.5 mm (0.5 in) | 16 years | 50 of 100 (Notable) |
| 11 October 2026 | Callao, US | monthly high min (Provisional) | 16.7 C (62.1 F) | 0.6 C (1.1 F) | 15 years | 25 of 100 (Routine) |
| 6 October 2026 | Callao, US | daily high max (Provisional) | 31.7 C (89.1 F) | 2.8 C (5.0 F) | 1 year | 15 of 100 (Routine) |
| 30 August 2026 | Callao, US | daily rain (Provisional) | 14.0 mm (0.6 in) | 4.6 mm (0.18 in) | 56 years | 20 of 100 (Routine) |
| 23 August 2026 | Callao, US | daily high max (Tie, Provisional) | 35.6 C (96.1 F) | tie | 5 years | 2 of 100 (Routine) |
| 21 August 2026 | Callao, US | daily high max (Provisional) | 37.2 C (99.0 F) | 1.1 C (2.0 F) | 13 years | 17 of 100 (Routine) |
| 7 August 2026 | Callao, US | daily high max | 37.8 C (100.0 F) | 0.6 C (1.1 F) | 9 years | 13 of 100 (Routine) |
| 27 July 2026 | Callao, US | daily high min | 22.2 C (72.0 F) | 1.6 C (2.9 F) | 39 years | 25 of 100 (Routine) |
| 27 July 2026 | Callao, US | daily high max (Tie) | 37.8 C (100.0 F) | tie | 29 years | 4 of 100 (Routine) |
| 21 July 2026 | Callao, US | daily high max (Tie) | 37.8 C (100.0 F) | tie | 36 years | 5 of 100 (Routine) |
| 18 July 2026 | Callao, US | daily high min (Tie) | 20.6 C (69.1 F) | tie | 60 years | 7 of 100 (Routine) |
| 17 July 2026 | Callao, US | daily rain | 13.7 mm (0.5 in) | 6.6 mm (0.26 in) | 52 years | 20 of 100 (Routine) |
| 13 July 2026 | Callao, US | daily high max (Tie) | 38.9 C (102.0 F) | tie | 24 years | 4 of 100 (Routine) |
| 29 June 2026 | Callao, US | daily low max | 18.3 C (64.9 F) | 3.4 C (6.1 F) | 56 years | 33 of 100 (Routine) |
| 29 June 2026 | Callao, US | daily low min (Tie) | 6.1 C (43.0 F) | tie | 60 years | 7 of 100 (Routine) |
| 24 June 2026 | Callao, US | daily high min | 20.6 C (69.1 F) | 0.6 C (1.1 F) | 56 years | 27 of 100 (Routine) |
| 6 June 2026 | Callao, US | daily high min | 18.9 C (66.0 F) | 2.2 C (4.0 F) | 5 years | 16 of 100 (Routine) |
| 12 May 2026 | Callao, US | daily high max | 33.3 C (91.9 F) | 2.2 C (4.0 F) | 123 years | 44 of 100 (Notable) |
| 21 April 2026 | Callao, US | daily high min (Tie) | 10.0 C (50.0 F) | tie | 32 years | 4 of 100 (Routine) |
| 31 March 2026 | Callao, US | daily high max (Tie) | 25.0 C (77.0 F) | tie | 40 years | 5 of 100 (Routine) |
Climate Trend
62 complete years, 1904 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1904 | 9.5 C | -0.44 C |
| 1963 | 9.4 C | -0.48 C |
| 1964 | 8.2 C | -1.73 C |
| 1965 | 9.5 C | -0.40 C |
| 1966 | 10.0 C | +0.08 C |
| 1967 | 9.7 C | -0.19 C |
| 1968 | 9.4 C | -0.55 C |
| 1969 | 9.9 C | -0.01 C |
| 1970 | 9.4 C | -0.50 C |
| 1971 | 9.1 C | -0.79 C |
| 1972 | 9.8 C | -0.12 C |
| 1973 | 9.2 C | -0.69 C |
| 1974 | 10.1 C | +0.19 C |
| 1975 | 9.0 C | -0.89 C |
| 1976 | 9.4 C | -0.51 C |
| 1977 | 10.4 C | +0.54 C |
| 1978 | 10.0 C | +0.14 C |
| 1979 | 9.6 C | -0.35 C |
| 1980 | 9.8 C | -0.14 C |
| 1981 | 10.9 C | +1.03 C |
| 1982 | 9.3 C | -0.60 C |
| 1983 | 10.1 C | +0.22 C |
| 1984 | 8.0 C | -1.94 C |
| 1985 | 9.3 C | -0.62 C |
| 1986 | 10.6 C | +0.71 C |
| 1987 | 10.2 C | +0.29 C |
| 1988 | 10.1 C | +0.18 C |
| 1989 | 9.5 C | -0.39 C |
| 1990 | 9.9 C | +0.02 C |
| 1991 | 9.5 C | -0.42 C |
| 1992 | 9.9 C | -0.04 C |
| 1993 | 8.6 C | -1.31 C |
| 1994 | 11.1 C | +1.16 C |
| 1995 | 10.5 C | +0.64 C |
| 1997 | 10.3 C | +0.40 C |
| 1999 | 10.3 C | +0.37 C |
| 2000 | 11.1 C | +1.24 C |
| 2001 | 11.0 C | +1.05 C |
| 2002 | 10.0 C | +0.07 C |
| 2003 | 11.5 C | +1.63 C |
| 2004 | 10.3 C | +0.39 C |
| 2005 | 10.3 C | +0.39 C |
| 2006 | 10.1 C | +0.21 C |
| 2007 | 10.2 C | +0.34 C |
| 2008 | 9.5 C | -0.41 C |
| 2009 | 9.2 C | -0.75 C |
| 2010 | 9.3 C | -0.62 C |
| 2011 | 8.9 C | -1.05 C |
| 2012 | 11.3 C | +1.39 C |
| 2013 | 8.6 C | -1.26 C |
| 2014 | 10.5 C | +0.64 C |
| 2015 | 10.8 C | +0.87 C |
| 2016 | 10.3 C | +0.43 C |
| 2017 | 10.3 C | +0.36 C |
| 2018 | 10.2 C | +0.32 C |
| 2019 | 9.3 C | -0.63 C |
| 2020 | 10.2 C | +0.32 C |
| 2021 | 10.3 C | +0.43 C |
| 2022 | 9.7 C | -0.18 C |
| 2023 | 9.3 C | -0.64 C |
| 2024 | 11.0 C | +1.14 C |
| 2025 | 11.6 C | +1.71 C |
The annual mean temperature here has risen by 0.12 C (0.03 to 0.21) per decade over 1904 to 2025. In Fahrenheit: 0.2 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 62 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.12 C (0.03 to 0.21) per decade | 0.2 F (0.1 to 0.4) per decade | 1904 to 2025 | 62 | Rise |
| Mean daily maximum | 0.09 C (-0.03 to 0.21) per decade | 0.2 F (-0.1 to 0.4) per decade | 1904 to 2025 | 62 | Not clearly different from zero |
| Mean daily minimum | 0.2 C (0.1 to 0.2) per decade | 0.3 F (0.1 to 0.4) per decade | 1904 to 2025 | 62 | 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
1902 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 41.1 C (106.0 F) | 2000 | 37.2 C (99.0 F) | 69 |
| Coldest night (TNn) | -31.1 C (-24.0 F) | 1963 | -20.3 C (-4.5 F) | 70 |
| Wettest day (Rx1day) | 53.8 mm (2.1 in) | 1982 | 17.8 mm (0.7 in) | 93 |
| Wettest five days (Rx5day) | 85.5 mm (3.4 in) | 1982 | 28.0 mm (1.1 in) | 93 |
| Longest dry spell (CDD) | 202 days | 1940 | 55 days | 93 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1902 | 23.9 C (75.0 F) |
| 1903 | 37.2 C (99.0 F) |
| 1904 | 36.1 C (97.0 F) |
| 1905 | 20.0 C (68.0 F) |
| 1938 | n/a |
| 1939 | n/a |
| 1940 | n/a |
| 1941 | n/a |
| 1942 | n/a |
| 1943 | n/a |
| 1944 | n/a |
| 1945 | n/a |
| 1946 | n/a |
| 1947 | n/a |
| 1948 | n/a |
| 1949 | n/a |
| 1950 | n/a |
| 1951 | n/a |
| 1952 | n/a |
| 1953 | n/a |
| 1954 | n/a |
| 1955 | n/a |
| 1956 | n/a |
| 1957 | n/a |
| 1958 | n/a |
| 1959 | n/a |
| 1960 | n/a |
| 1961 | n/a |
| 1962 | 36.1 C (97.0 F) |
| 1963 | 35.0 C (95.0 F) |
| 1964 | 36.7 C (98.1 F) |
| 1965 | 35.0 C (95.0 F) |
| 1966 | 37.2 C (99.0 F) |
| 1967 | 35.6 C (96.1 F) |
| 1968 | 37.2 C (99.0 F) |
| 1969 | 34.4 C (93.9 F) |
| 1970 | 36.1 C (97.0 F) |
| 1971 | 35.0 C (95.0 F) |
| 1972 | 37.8 C (100.0 F) |
| 1973 | 35.6 C (96.1 F) |
| 1974 | 37.2 C (99.0 F) |
| 1975 | 35.0 C (95.0 F) |
| 1976 | 37.8 C (100.0 F) |
| 1977 | 37.2 C (99.0 F) |
| 1978 | 37.2 C (99.0 F) |
| 1979 | 37.2 C (99.0 F) |
| 1980 | 37.2 C (99.0 F) |
| 1981 | 36.7 C (98.1 F) |
| 1982 | 37.2 C (99.0 F) |
| 1983 | 36.1 C (97.0 F) |
| 1984 | 37.2 C (99.0 F) |
| 1985 | 38.3 C (100.9 F) |
| 1986 | 37.2 C (99.0 F) |
| 1987 | 35.6 C (96.1 F) |
| 1988 | 37.2 C (99.0 F) |
| 1989 | 37.8 C (100.0 F) |
| 1990 | 38.3 C (100.9 F) |
| 1991 | 36.7 C (98.1 F) |
| 1992 | 37.2 C (99.0 F) |
| 1993 | 36.1 C (97.0 F) |
| 1994 | 38.9 C (102.0 F) |
| 1995 | 36.7 C (98.1 F) |
| 1996 | 37.8 C (100.0 F) |
| 1997 | 36.7 C (98.1 F) |
| 1998 | 38.3 C (100.9 F) |
| 1999 | 36.7 C (98.1 F) |
| 2000 | 41.1 C (106.0 F) |
| 2001 | 40.0 C (104.0 F) |
| 2002 | 40.0 C (104.0 F) |
| 2003 | 38.9 C (102.0 F) |
| 2004 | 36.1 C (97.0 F) |
| 2005 | 38.9 C (102.0 F) |
| 2006 | 38.3 C (100.9 F) |
| 2007 | 37.8 C (100.0 F) |
| 2008 | 36.7 C (98.1 F) |
| 2009 | 36.7 C (98.1 F) |
| 2010 | 36.1 C (97.0 F) |
| 2011 | 36.1 C (97.0 F) |
| 2012 | 40.0 C (104.0 F) |
| 2013 | 36.7 C (98.1 F) |
| 2014 | 36.7 C (98.1 F) |
| 2015 | 36.7 C (98.1 F) |
| 2016 | 37.2 C (99.0 F) |
| 2017 | 36.1 C (97.0 F) |
| 2018 | 36.7 C (98.1 F) |
| 2019 | 36.7 C (98.1 F) |
| 2020 | 37.8 C (100.0 F) |
| 2021 | 37.8 C (100.0 F) |
| 2022 | 37.8 C (100.0 F) |
| 2023 | 38.3 C (100.9 F) |
| 2024 | 39.4 C (102.9 F) |
| 2025 | 36.7 C (98.1 F) |
| 2026 | 38.9 C (102.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1902 | -17.8 C (0.0 F) |
| 1903 | -20.0 C (-4.0 F) |
| 1904 | -21.1 C (-6.0 F) |
| 1905 | -23.9 C (-11.0 F) |
| 1938 | n/a |
| 1939 | n/a |
| 1940 | n/a |
| 1941 | n/a |
| 1942 | n/a |
| 1943 | n/a |
| 1944 | n/a |
| 1945 | n/a |
| 1946 | n/a |
| 1947 | n/a |
| 1948 | n/a |
| 1949 | n/a |
| 1950 | n/a |
| 1951 | n/a |
| 1952 | -5.6 C (21.9 F) |
| 1953 | n/a |
| 1954 | n/a |
| 1955 | n/a |
| 1956 | n/a |
| 1957 | n/a |
| 1958 | n/a |
| 1959 | n/a |
| 1960 | n/a |
| 1961 | n/a |
| 1962 | -22.8 C (-9.0 F) |
| 1963 | -31.1 C (-24.0 F) |
| 1964 | -19.4 C (-2.9 F) |
| 1965 | -17.2 C (1.0 F) |
| 1966 | -22.2 C (-8.0 F) |
| 1967 | -15.0 C (5.0 F) |
| 1968 | -22.8 C (-9.0 F) |
| 1969 | -16.7 C (1.9 F) |
| 1970 | -25.0 C (-13.0 F) |
| 1971 | -27.8 C (-18.0 F) |
| 1972 | -30.0 C (-22.0 F) |
| 1973 | -22.2 C (-8.0 F) |
| 1974 | -20.0 C (-4.0 F) |
| 1975 | -18.9 C (-2.0 F) |
| 1976 | -18.9 C (-2.0 F) |
| 1977 | -17.8 C (0.0 F) |
| 1978 | -22.8 C (-9.0 F) |
| 1979 | -26.1 C (-15.0 F) |
| 1980 | -26.7 C (-16.1 F) |
| 1981 | -18.3 C (-0.9 F) |
| 1982 | -22.2 C (-8.0 F) |
| 1983 | -17.8 C (0.0 F) |
| 1984 | -27.2 C (-17.0 F) |
| 1985 | -18.9 C (-2.0 F) |
| 1986 | -16.1 C (3.0 F) |
| 1987 | -22.2 C (-8.0 F) |
| 1988 | -22.2 C (-8.0 F) |
| 1989 | -30.6 C (-23.1 F) |
| 1990 | -30.6 C (-23.1 F) |
| 1991 | -22.2 C (-8.0 F) |
| 1992 | -21.1 C (-6.0 F) |
| 1993 | -26.1 C (-15.0 F) |
| 1994 | -22.2 C (-8.0 F) |
| 1995 | -17.8 C (0.0 F) |
| 1996 | -21.7 C (-7.1 F) |
| 1997 | -22.2 C (-8.0 F) |
| 1998 | -24.4 C (-11.9 F) |
| 1999 | -18.3 C (-0.9 F) |
| 2000 | -15.6 C (3.9 F) |
| 2001 | -16.7 C (1.9 F) |
| 2002 | -23.9 C (-11.0 F) |
| 2003 | -16.7 C (1.9 F) |
| 2004 | -13.9 C (7.0 F) |
| 2005 | -19.4 C (-2.9 F) |
| 2006 | -18.9 C (-2.0 F) |
| 2007 | -22.8 C (-9.0 F) |
| 2008 | -21.7 C (-7.1 F) |
| 2009 | -22.2 C (-8.0 F) |
| 2010 | -18.9 C (-2.0 F) |
| 2011 | -23.3 C (-9.9 F) |
| 2012 | -18.9 C (-2.0 F) |
| 2013 | -27.2 C (-17.0 F) |
| 2014 | -17.8 C (0.0 F) |
| 2015 | -20.0 C (-4.0 F) |
| 2016 | -21.1 C (-6.0 F) |
| 2017 | -27.8 C (-18.0 F) |
| 2018 | -15.0 C (5.0 F) |
| 2019 | -18.9 C (-2.0 F) |
| 2020 | -20.6 C (-5.1 F) |
| 2021 | -14.4 C (6.1 F) |
| 2022 | -16.7 C (1.9 F) |
| 2023 | -18.9 C (-2.0 F) |
| 2024 | -16.7 C (1.9 F) |
| 2025 | -17.2 C (1.0 F) |
| 2026 | -15.0 C (5.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1902 | 5.8 mm (0.23 in) |
| 1903 | 21.1 mm (0.8 in) |
| 1904 | 33.0 mm (1.3 in) |
| 1905 | 14.5 mm (0.6 in) |
| 1938 | 14.0 mm (0.6 in) |
| 1939 | 10.2 mm (0.4 in) |
| 1940 | 15.2 mm (0.6 in) |
| 1941 | 19.1 mm (0.8 in) |
| 1942 | 18.8 mm (0.7 in) |
| 1943 | 16.5 mm (0.6 in) |
| 1944 | 10.2 mm (0.4 in) |
| 1945 | 23.9 mm (0.9 in) |
| 1946 | 13.7 mm (0.5 in) |
| 1947 | 18.3 mm (0.7 in) |
| 1948 | 16.5 mm (0.6 in) |
| 1949 | 30.5 mm (1.2 in) |
| 1950 | 31.8 mm (1.3 in) |
| 1951 | 16.5 mm (0.6 in) |
| 1952 | 15.2 mm (0.6 in) |
| 1953 | 10.7 mm (0.4 in) |
| 1954 | 17.8 mm (0.7 in) |
| 1955 | 25.4 mm (1.0 in) |
| 1956 | 17.8 mm (0.7 in) |
| 1957 | 11.9 mm (0.5 in) |
| 1958 | 11.4 mm (0.4 in) |
| 1959 | 22.6 mm (0.9 in) |
| 1960 | 12.2 mm (0.5 in) |
| 1961 | 26.4 mm (1.0 in) |
| 1962 | 20.6 mm (0.8 in) |
| 1963 | 25.4 mm (1.0 in) |
| 1964 | 23.6 mm (0.9 in) |
| 1965 | 23.4 mm (0.9 in) |
| 1966 | 15.2 mm (0.6 in) |
| 1967 | 22.4 mm (0.9 in) |
| 1968 | 20.8 mm (0.8 in) |
| 1969 | 25.4 mm (1.0 in) |
| 1970 | 17.8 mm (0.7 in) |
| 1971 | 15.7 mm (0.6 in) |
| 1972 | 9.9 mm (0.39 in) |
| 1973 | 8.6 mm (0.34 in) |
| 1974 | 12.7 mm (0.5 in) |
| 1975 | 21.3 mm (0.8 in) |
| 1976 | 15.0 mm (0.6 in) |
| 1977 | 32.5 mm (1.3 in) |
| 1978 | 19.1 mm (0.8 in) |
| 1979 | 26.7 mm (1.1 in) |
| 1980 | 11.7 mm (0.5 in) |
| 1981 | 22.9 mm (0.9 in) |
| 1982 | 53.8 mm (2.1 in) |
| 1983 | 35.8 mm (1.4 in) |
| 1984 | 14.5 mm (0.6 in) |
| 1985 | 16.5 mm (0.6 in) |
| 1986 | 21.8 mm (0.9 in) |
| 1987 | 17.3 mm (0.7 in) |
| 1988 | 25.4 mm (1.0 in) |
| 1989 | 38.4 mm (1.5 in) |
| 1990 | 15.2 mm (0.6 in) |
| 1991 | 42.4 mm (1.7 in) |
| 1992 | 21.8 mm (0.9 in) |
| 1993 | 39.1 mm (1.5 in) |
| 1994 | 14.5 mm (0.6 in) |
| 1995 | 18.5 mm (0.7 in) |
| 1996 | 14.0 mm (0.6 in) |
| 1997 | 19.3 mm (0.8 in) |
| 1998 | 23.1 mm (0.9 in) |
| 1999 | 12.2 mm (0.5 in) |
| 2000 | 25.9 mm (1.0 in) |
| 2001 | 17.3 mm (0.7 in) |
| 2002 | 30.0 mm (1.2 in) |
| 2003 | 17.0 mm (0.7 in) |
| 2004 | 28.7 mm (1.1 in) |
| 2005 | 21.1 mm (0.8 in) |
| 2006 | 11.2 mm (0.4 in) |
| 2007 | 9.7 mm (0.38 in) |
| 2008 | 10.2 mm (0.4 in) |
| 2009 | 30.7 mm (1.2 in) |
| 2010 | 23.9 mm (0.9 in) |
| 2011 | 35.8 mm (1.4 in) |
| 2012 | 17.0 mm (0.7 in) |
| 2013 | 13.7 mm (0.5 in) |
| 2014 | 16.3 mm (0.6 in) |
| 2015 | 17.3 mm (0.7 in) |
| 2016 | 16.8 mm (0.7 in) |
| 2017 | 13.5 mm (0.5 in) |
| 2018 | 14.0 mm (0.6 in) |
| 2019 | 25.4 mm (1.0 in) |
| 2020 | 17.3 mm (0.7 in) |
| 2021 | 14.7 mm (0.6 in) |
| 2022 | 24.6 mm (1.0 in) |
| 2023 | 16.8 mm (0.7 in) |
| 2024 | 9.7 mm (0.38 in) |
| 2025 | 14.5 mm (0.6 in) |
| 2026 | 44.2 mm (1.7 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1902 | 5.8 mm (0.23 in) |
| 1903 | 49.1 mm (1.9 in) |
| 1904 | 33.0 mm (1.3 in) |
| 1905 | 23.1 mm (0.9 in) |
| 1938 | 14.0 mm (0.6 in) |
| 1939 | 7.6 mm (0.30 in) |
| 1940 | 15.2 mm (0.6 in) |
| 1941 | 27.9 mm (1.1 in) |
| 1942 | 20.3 mm (0.8 in) |
| 1943 | 30.5 mm (1.2 in) |
| 1944 | 10.2 mm (0.4 in) |
| 1945 | 28.0 mm (1.1 in) |
| 1946 | 20.5 mm (0.8 in) |
| 1947 | 29.4 mm (1.2 in) |
| 1948 | 16.5 mm (0.6 in) |
| 1949 | 35.6 mm (1.4 in) |
| 1950 | 36.4 mm (1.4 in) |
| 1951 | 16.5 mm (0.6 in) |
| 1952 | 29.2 mm (1.1 in) |
| 1953 | 13.2 mm (0.5 in) |
| 1954 | 26.7 mm (1.1 in) |
| 1955 | 40.1 mm (1.6 in) |
| 1956 | 19.3 mm (0.8 in) |
| 1957 | 25.5 mm (1.0 in) |
| 1958 | 11.4 mm (0.4 in) |
| 1959 | 30.7 mm (1.2 in) |
| 1960 | 26.2 mm (1.0 in) |
| 1961 | 36.8 mm (1.4 in) |
| 1962 | 29.7 mm (1.2 in) |
| 1963 | 42.6 mm (1.7 in) |
| 1964 | 36.9 mm (1.5 in) |
| 1965 | 38.6 mm (1.5 in) |
| 1966 | 16.0 mm (0.6 in) |
| 1967 | 50.0 mm (2.0 in) |
| 1968 | 42.0 mm (1.7 in) |
| 1969 | 57.2 mm (2.3 in) |
| 1970 | 26.6 mm (1.0 in) |
| 1971 | 29.0 mm (1.1 in) |
| 1972 | 9.9 mm (0.39 in) |
| 1973 | 18.8 mm (0.7 in) |
| 1974 | 26.5 mm (1.0 in) |
| 1975 | 28.5 mm (1.1 in) |
| 1976 | 18.0 mm (0.7 in) |
| 1977 | 52.7 mm (2.1 in) |
| 1978 | 25.0 mm (1.0 in) |
| 1979 | 26.7 mm (1.1 in) |
| 1980 | 21.9 mm (0.9 in) |
| 1981 | 52.1 mm (2.1 in) |
| 1982 | 85.5 mm (3.4 in) |
| 1983 | 60.7 mm (2.4 in) |
| 1984 | 32.5 mm (1.3 in) |
| 1985 | 20.6 mm (0.8 in) |
| 1986 | 31.5 mm (1.2 in) |
| 1987 | 34.1 mm (1.3 in) |
| 1988 | 26.4 mm (1.0 in) |
| 1989 | 44.5 mm (1.8 in) |
| 1990 | 15.7 mm (0.6 in) |
| 1991 | 66.3 mm (2.6 in) |
| 1992 | 32.2 mm (1.3 in) |
| 1993 | 39.1 mm (1.5 in) |
| 1994 | 20.6 mm (0.8 in) |
| 1995 | 34.2 mm (1.3 in) |
| 1996 | 25.0 mm (1.0 in) |
| 1997 | 45.7 mm (1.8 in) |
| 1998 | 39.8 mm (1.6 in) |
| 1999 | 31.1 mm (1.2 in) |
| 2000 | 30.2 mm (1.2 in) |
| 2001 | 18.3 mm (0.7 in) |
| 2002 | 44.4 mm (1.7 in) |
| 2003 | 24.7 mm (1.0 in) |
| 2004 | 32.3 mm (1.3 in) |
| 2005 | 29.5 mm (1.2 in) |
| 2006 | 19.1 mm (0.8 in) |
| 2007 | 13.7 mm (0.5 in) |
| 2008 | 10.9 mm (0.4 in) |
| 2009 | 30.7 mm (1.2 in) |
| 2010 | 40.8 mm (1.6 in) |
| 2011 | 36.8 mm (1.4 in) |
| 2012 | 22.9 mm (0.9 in) |
| 2013 | 17.0 mm (0.7 in) |
| 2014 | 23.1 mm (0.9 in) |
| 2015 | 28.6 mm (1.1 in) |
| 2016 | 31.0 mm (1.2 in) |
| 2017 | 20.9 mm (0.8 in) |
| 2018 | 27.0 mm (1.1 in) |
| 2019 | 35.3 mm (1.4 in) |
| 2020 | 17.3 mm (0.7 in) |
| 2021 | 27.4 mm (1.1 in) |
| 2022 | 29.7 mm (1.2 in) |
| 2023 | 24.9 mm (1.0 in) |
| 2024 | 10.5 mm (0.4 in) |
| 2025 | 20.6 mm (0.8 in) |
| 2026 | 44.2 mm (1.7 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1902 | 18 days |
| 1903 | 50 days |
| 1904 | 38 days |
| 1905 | 19 days |
| 1938 | 85 days |
| 1939 | 73 days |
| 1940 | 202 days |
| 1941 | 47 days |
| 1942 | 64 days |
| 1943 | 123 days |
| 1944 | 95 days |
| 1945 | 52 days |
| 1946 | 71 days |
| 1947 | 69 days |
| 1948 | 153 days |
| 1949 | 156 days |
| 1950 | 68 days |
| 1951 | 86 days |
| 1952 | 158 days |
| 1953 | 143 days |
| 1954 | 88 days |
| 1955 | 91 days |
| 1956 | 75 days |
| 1957 | 126 days |
| 1958 | 96 days |
| 1959 | 60 days |
| 1960 | 43 days |
| 1961 | 63 days |
| 1962 | 70 days |
| 1963 | 71 days |
| 1964 | 74 days |
| 1965 | 33 days |
| 1966 | 46 days |
| 1967 | 41 days |
| 1968 | 42 days |
| 1969 | 65 days |
| 1970 | 47 days |
| 1971 | 73 days |
| 1972 | 60 days |
| 1973 | 36 days |
| 1974 | 78 days |
| 1975 | 58 days |
| 1976 | 49 days |
| 1977 | 83 days |
| 1978 | 72 days |
| 1979 | 60 days |
| 1980 | 32 days |
| 1981 | 55 days |
| 1982 | 40 days |
| 1983 | 24 days |
| 1984 | 41 days |
| 1985 | 34 days |
| 1986 | 42 days |
| 1987 | 48 days |
| 1988 | 57 days |
| 1989 | 46 days |
| 1990 | 65 days |
| 1991 | 54 days |
| 1992 | 57 days |
| 1993 | 45 days |
| 1994 | 60 days |
| 1995 | 41 days |
| 1996 | 47 days |
| 1997 | 40 days |
| 1998 | 31 days |
| 1999 | 85 days |
| 2000 | 50 days |
| 2001 | 54 days |
| 2002 | 56 days |
| 2003 | 45 days |
| 2004 | 44 days |
| 2005 | 47 days |
| 2006 | 44 days |
| 2007 | 47 days |
| 2008 | 43 days |
| 2009 | 71 days |
| 2010 | 69 days |
| 2011 | 25 days |
| 2012 | 39 days |
| 2013 | 37 days |
| 2014 | 52 days |
| 2015 | 53 days |
| 2016 | 53 days |
| 2017 | 67 days |
| 2018 | 61 days |
| 2019 | 52 days |
| 2020 | 80 days |
| 2021 | 59 days |
| 2022 | 51 days |
| 2023 | 42 days |
| 2024 | 71 days |
| 2025 | 96 days |
| 2026 | 48 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
62 years with a frostAcross 62 years with a frost, the median last spring frost at Callao falls on 14 May and the median first autumn frost on 28 September, which leaves a median of 134 days between them.
In 1994 to 2025 the median growing season was 137 days. That is 3 days more than in 1904 to 1991.
Fitted over all years, the growing season changes by +4.4 days per decade at this station.
| Measure | Median, all years | Earliest period (1904 to 1991) | Recent period (1994 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 14 May | 16 May | 13 May | 3 days earlier | -2.0 days per decade |
| First autumn frost | 28 September | 25 September | 3 October | 8 days later | +2.3 days per decade |
| Growing days | 134 days | 134 days | 137 days | 3 days more | +4.4 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
85 years, 1940 to 2025A day with at least 18.4 mm (0.7 in) of rain is expected about once in 2 years. A day with at least 49.4 mm (1.9 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 18.4 mm (0.7 in) | |
| 5 years | 25.5 mm (1.0 in) | |
| 10 years | 30.7 mm (1.2 in) | |
| 25 years | 37.7 mm (1.5 in) | |
| 50 years | 43.4 mm (1.7 in) | |
| 100 years | 49.4 mm (1.9 in) | Longer than the 85 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, 85 years of values from 1940 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: 53.8 mm (2.1 in) in 1982; 42.4 mm (1.7 in) in 1991; 39.1 mm (1.5 in) in 1993.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Callao, at 2006. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2006 ran 0.4 C (0.7 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 2006 | -0.4 | -0.7 | 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
2011 to 2025 against 1961 to 1990Over 2011 to 2025, Callao had a mean temperature of 10.2 C (50.3 F) and 155.6 mm (6.1 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Wah Wah Rch (United States, 159 km away), Malheur Branch Exp STN (United States, 530 km away) and Delta (United States, 115 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Wah Wah Rch | United States | 159 km (99 mi) | 10.6 C (51.0 F) | 174.2 mm (6.9 in) | 0.61 |
| Malheur Branch Exp STN | United States | 530 km (329 mi) | 10.3 C (50.5 F) | 257.7 mm (10.1 in) | 0.69 |
| Delta | United States | 115 km (71 mi) | 9.7 C (49.5 F) | 204.8 mm (8.1 in) | 0.70 |
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
Download the Data
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-14 (14 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-14).