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Data as of 2025-12-31
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Built 2026-10-18 (18 October 2026)

Sentinel Threshold Days by Year

15 fixed thresholds counted per year at Sentinel (USC00027751): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Sentinel Thresholds

  • Sentinel: days with 10 mm (0.39 in) or more of precipitation in 22 years, most in 1918 with 9.
  • Sentinel: days with 25 mm (0.98 in) or more of precipitation in 14 years, most in 1918 with 2.
  • Sentinel: days with a maximum temperature at or above 30 C (86 F) in 10 years, most in 1914 with 218.
  • Sentinel: days with a maximum temperature at or above 35 C (95 F) in 10 years, most in 1915 with 165.
  • 15 fixed thresholds have at least one qualifying day at Sentinel.
10 years with a qualifying day
Days at or above 30 C (86 F) per year at Sentinel Days per year at Sentinel with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 218 in 1914. 01002003001907: 1901908: 2031909: 2101912: 1601913: 1781914: 2181915: 2091916: 2131917: 2161918: 2171907190819091912191319141915191619171918
Days per year at Sentinel with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 218 in 1914.
Days at or above 30 C (86 F) per year at Sentinel
YearDaysDecade average
1907190201
1908203201
1909210201
1912160201.6
1913178201.6
1914218201.6
1915209201.6
1916213201.6
1917216201.6
1918217201.6
First to last qualifying date each year at Sentinel For each year, a bar from the first to the last day at Sentinel meeting 30 C (86 F). 1907: 17 March 1907 to 15 October 19071908: 14 March 1908 to 8 November 19081909: 1 April 1909 to 7 November 19091912: 18 March 1912 to 19 October 19121913: 29 March 1913 to 8 November 19131914: 1 March 1914 to 14 November 19141915: 16 March 1915 to 5 November 19151916: 17 February 1916 to 4 November 19161917: 18 March 1917 to 31 December 19171918: 1 January 1918 to 25 November 191819071909191319151917JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Sentinel meeting 30 C (86 F).
First to last qualifying date each year at Sentinel
YearFirst dateLast date
19071907-03-171907-10-15
19081908-03-141908-11-08
19091909-04-011909-11-07
19121912-03-181912-10-19
19131913-03-291913-11-08
19141914-03-011914-11-14
19151915-03-161915-11-05
19161916-02-171916-11-04
19171917-03-181917-12-31
19181918-01-011918-11-25

Every Fixed Threshold

Fixed thresholds at Sentinel
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days102181914217
35 C (95 F): Days101651915154
40 C (104 F): Days10109191792
45 C (113 F): Days1027191716
50 C (122 F): Days1119171
90 F (32.2 C): Days102051909186
100 F (37.8 C): Days101321915120
110 F (43.3 C): Days1062191746
120 F (48.9 C): Days4219071
0 C (32 F): Frost days (min834191834
20 C (68 F): Tropical nights (min8106191480
25 C (77 F): Days with min845191427
10 mm (0.39 in): Days with 10 mm or more rain22919189
25 mm (0.98 in): Days with 25 mm or more rain14219182
50 mm (1.97 in): Days with 50 mm or more rain1119511

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1907.

Download the Data

  • Data for Sentinel 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

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