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

San Carlos Threshold Days by Year (USC00027475)

15 fixed thresholds counted per year at San Carlos (USC00027475): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Carlos Thresholds

  • San Carlos: days with 10 mm (0.39 in) or more of precipitation in 32 years, most in 1941 with 19.
  • San Carlos: days with a maximum temperature at or above 30 C (86 F) in 29 years, most in 1950 with 203.
  • San Carlos: days with a maximum temperature at or above 35 C (95 F) in 29 years, most in 1956 with 129.
  • San Carlos: days with a maximum temperature at or above 40 C (104 F) in 29 years, most in 1960 with 40.
  • 15 fixed thresholds have at least one qualifying day at San Carlos.
29 years with a qualifying day
Days at or above 30 C (86 F) per year at San Carlos Days per year at San Carlos with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 203 in 1950. 01002003001941: 1401942: 1591943: 1741944: 1621945: 1831946: 1851947: 1721948: 1821949: 1801950: 2031951: 1661952: 1731953: 1571954: 1841955: 1581956: 1811957: 1421958: 1611959: 1821960: 1681961: 1651962: 1481963: 1751964: 1531965: 1611966: 1591967: 1621968: 1581969: 1511941194419471950195319561959196219651968
Days per year at San Carlos with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 203 in 1950.
Days at or above 30 C (86 F) per year at San Carlos
YearDaysDecade average
1941140170.8
1942159170.8
1943174170.8
1944162170.8
1945183170.8
1946185170.8
1947172170.8
1948182170.8
1949180170.8
1950203170.7
1951166170.7
1952173170.7
1953157170.7
1954184170.7
1955158170.7
1956181170.7
1957142170.7
1958161170.7
1959182170.7
1960168160
1961165160
1962148160
1963175160
1964153160
1965161160
1966159160
1967162160
1968158160
1969151160
First to last qualifying date each year at San Carlos For each year, a bar from the first to the last day at San Carlos meeting 30 C (86 F). 1941: 29 April 1941 to 3 October 19411942: 1 April 1942 to 10 October 19421943: 27 March 1943 to 1 November 19431944: 4 April 1944 to 5 November 19441945: 8 April 1945 to 4 November 19451946: 9 March 1946 to 26 October 19461947: 15 April 1947 to 27 October 19471948: 9 April 1948 to 26 October 19481949: 13 April 1949 to 6 November 19491950: 22 March 1950 to 31 October 19501951: 14 April 1951 to 28 October 19511952: 4 April 1952 to 30 October 19521953: 15 April 1953 to 5 November 19531954: 9 April 1954 to 24 October 19541955: 1 April 1955 to 19 October 19551956: 18 March 1956 to 22 October 19561957: 14 February 1957 to 10 October 19571958: 18 April 1958 to 25 October 19581959: 1 April 1959 to 27 October 19591960: 21 March 1960 to 25 October 19601961: 2 April 1961 to 21 October 19611962: 9 April 1962 to 14 October 19621963: 7 April 1963 to 27 October 19631964: 30 March 1964 to 29 October 19641965: 19 April 1965 to 7 November 19651966: 31 March 1966 to 31 October 19661967: 16 March 1967 to 28 October 19671968: 30 April 1968 to 29 October 19681969: 29 March 1969 to 21 October 196919411945194919531957196119651969JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at San Carlos meeting 30 C (86 F).
First to last qualifying date each year at San Carlos
YearFirst dateLast date
19411941-04-291941-10-03
19421942-04-011942-10-10
19431943-03-271943-11-01
19441944-04-041944-11-05
19451945-04-081945-11-04
19461946-03-091946-10-26
19471947-04-151947-10-27
19481948-04-091948-10-26
19491949-04-131949-11-06
19501950-03-221950-10-31
19511951-04-141951-10-28
19521952-04-041952-10-30
19531953-04-151953-11-05
19541954-04-091954-10-24
19551955-04-011955-10-19
19561956-03-181956-10-22
19571957-02-141957-10-10
19581958-04-181958-10-25
19591959-04-011959-10-27
19601960-03-211960-10-25
19611961-04-021961-10-21
19621962-04-091962-10-14
19631963-04-071963-10-27
19641964-03-301964-10-29
19651965-04-191965-11-07
19661966-03-311966-10-31
19671967-03-161967-10-28
19681968-04-301968-10-29
19691969-03-291969-10-21

Every Fixed Threshold

Fixed thresholds at San Carlos
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days292031950151
35 C (95 F): Days291291956109
40 C (104 F): Days2940196032
45 C (113 F): Days2119581
90 F (32.2 C): Days291821950134
100 F (37.8 C): Days2984196068
110 F (43.3 C): Days18519484
0 C (32 F): Frost days (min29129195675
-10 C (14 F): Days with min191519641
20 C (68 F): Tropical nights (min2978194153
25 C (77 F): Days with min203119411
10 mm (0.39 in): Days with 10 mm or more rain3219194110
25 mm (0.98 in): Days with 25 mm or more rain28619552
50 mm (1.97 in): Days with 50 mm or more rain4119411
10 cm (3.9 in): Days with 10 cm or more snowfall2119601

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1941.

Download the Data

  • Data for San Carlos 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).