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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

San Manuel Threshold Days by Year (USC00027530)

15 fixed thresholds counted per year at San Manuel (USC00027530): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Manuel Thresholds

  • San Manuel: days with 10 mm (0.39 in) or more of precipitation in 67 years, most in 1983 with 23.
  • San Manuel: days with 25 mm (0.98 in) or more of precipitation in 55 years, most in 1983 with 6.
  • San Manuel: days with a maximum temperature at or above 30 C (86 F) in 37 years, most in 2020 with 176.
  • San Manuel: days with a maximum temperature at or above 35 C (95 F) in 37 years, most in 2024 with 107.
  • 15 fixed thresholds have at least one qualifying day at San Manuel.
37 years with a qualifying day
Days at or above 30 C (86 F) per year at San Manuel Days per year at San Manuel with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 176 in 2020. 0501001502001955: 1461956: 1611957: 1241958: 1481959: 1571960: 1521961: 1461962: 1511963: 1601964: 1371965: 1431966: 1371967: 1421968: 1441969: 1581970: 1371971: 1421972: 1741973: 1621974: 1401975: 1401976: 1331977: 1412012: 1472013: 1402014: 1392015: 1302016: 1352017: 1592018: 1552019: 1312020: 1762021: 1432022: 1612023: 1662024: 1762025: 1421955195919631967197119752013201720212025
Days per year at San Manuel with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 176 in 2020.
Days at or above 30 C (86 F) per year at San Manuel
YearDaysDecade average
1955146147.2
1956161147.2
1957124147.2
1958148147.2
1959157147.2
1960152147
1961146147
1962151147
1963160147
1964137147
1965143147
1966137147
1967142147
1968144147
1969158147
1970137146.1
1971142146.1
1972174146.1
1973162146.1
1974140146.1
1975140146.1
1976133146.1
1977141146.1
2012147142
2013140142
2014139142
2015130142
2016135142
2017159142
2018155142
2019131142
2020176160.7
2021143160.7
2022161160.7
2023166160.7
2024176160.7
2025142160.7
First to last qualifying date each year at San Manuel For each year, a bar from the first to the last day at San Manuel meeting 30 C (86 F). 1955: 4 May 1955 to 20 October 19551956: 25 March 1956 to 27 October 19561957: 14 February 1957 to 9 October 19571958: 20 April 1958 to 19 October 19581959: 2 April 1959 to 26 October 19591960: 5 April 1960 to 8 October 19601961: 3 April 1961 to 21 October 19611962: 12 April 1962 to 25 October 19621963: 7 April 1963 to 15 October 19631964: 15 April 1964 to 29 October 19641965: 20 April 1965 to 30 October 19651966: 1 April 1966 to 11 October 19661967: 16 March 1967 to 21 October 19671968: 1 May 1968 to 29 October 19681969: 30 March 1969 to 17 October 19691970: 4 May 1970 to 25 September 19701971: 23 March 1971 to 14 October 19711972: 5 March 1972 to 16 October 19721973: 27 April 1973 to 9 November 19731974: 8 April 1974 to 10 October 19741975: 21 April 1975 to 30 October 19751976: 11 April 1976 to 11 October 19761977: 7 April 1977 to 18 October 19772012: 8 April 2012 to 4 October 20122013: 15 March 2013 to 24 October 20132014: 9 April 2014 to 25 October 20142015: 28 March 2015 to 14 October 20152016: 6 April 2016 to 28 October 20162017: 18 March 2017 to 23 October 20172018: 10 April 2018 to 1 October 20182019: 8 April 2019 to 8 October 20192020: 24 April 2020 to 5 November 20202021: 3 April 2021 to 8 October 20212022: 26 March 2022 to 3 October 20222023: 10 April 2023 to 22 October 20232024: 18 April 2024 to 28 October 20242025: 25 March 2025 to 23 September 202519551960196519701975201420192024JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at San Manuel meeting 30 C (86 F).
First to last qualifying date each year at San Manuel
YearFirst dateLast date
19551955-05-041955-10-20
19561956-03-251956-10-27
19571957-02-141957-10-09
19581958-04-201958-10-19
19591959-04-021959-10-26
19601960-04-051960-10-08
19611961-04-031961-10-21
19621962-04-121962-10-25
19631963-04-071963-10-15
19641964-04-151964-10-29
19651965-04-201965-10-30
19661966-04-011966-10-11
19671967-03-161967-10-21
19681968-05-011968-10-29
19691969-03-301969-10-17
19701970-05-041970-09-25
19711971-03-231971-10-14
19721972-03-051972-10-16
19731973-04-271973-11-09
19741974-04-081974-10-10
19751975-04-211975-10-30
19761976-04-111976-10-11
19771977-04-071977-10-18
20122012-04-082012-10-04
20132013-03-152013-10-24
20142014-04-092014-10-25
20152015-03-282015-10-14
20162016-04-062016-10-28
20172017-03-182017-10-23
20182018-04-102018-10-01
20192019-04-082019-10-08
20202020-04-242020-11-05
20212021-04-032021-10-08
20222022-03-262022-10-03
20232023-04-102023-10-22
20242024-04-182024-10-28
20252025-03-252025-09-23

Every Fixed Threshold

Fixed thresholds at San Manuel
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days371762020142
35 C (95 F): Days37107202489
40 C (104 F): Days3728202320
90 F (32.2 C): Days371542020127
100 F (37.8 C): Days3764202052
110 F (43.3 C): Days5219701
0 C (32 F): Frost days (min3758196410
-10 C (14 F): Days with min2319713
20 C (68 F): Tropical nights (min371172024107
25 C (77 F): Days with min3334202329
10 mm (0.39 in): Days with 10 mm or more rain672319834
25 mm (0.98 in): Days with 25 mm or more rain55619831
50 mm (1.97 in): Days with 50 mm or more rain9219672
10 cm (3.9 in): Days with 10 cm or more snowfall9219671
25 cm (9.8 in): Days with 25 cm or more snowfall1119711

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1955.

Download the Data

  • Data for San Manuel threshold days by year: CSV or JSON. Field meanings are on the data page.

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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).