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

Signal Threshold Days by Year (USC00027884)

14 fixed thresholds counted per year at Signal (USC00027884): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Signal Thresholds

  • Signal: days with 10 mm (0.39 in) or more of precipitation in 13 years, most in 1906 with 12.
  • Signal: days with a maximum temperature at or above 30 C (86 F) in 12 years, most in 1902 with 211.
  • Signal: days with a maximum temperature at or above 35 C (95 F) in 12 years, most in 1901 with 151.
  • Signal: days with a maximum temperature at or above 40 C (104 F) in 12 years, most in 1899 with 98.
  • 14 fixed thresholds have at least one qualifying day at Signal.
12 years with a qualifying day
Days at or above 30 C (86 F) per year at Signal Days per year at Signal with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 211 in 1902. 01002003001893: 1591894: 1881895: 1791896: 1781897: 1721898: 1751899: 1941900: 2011901: 1991902: 2111903: 1941906: 169189318951897189919011903
Days per year at Signal with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 211 in 1902.
Days at or above 30 C (86 F) per year at Signal
YearDaysDecade average
1893159177.9
1894188177.9
1895179177.9
1896178177.9
1897172177.9
1898175177.9
1899194177.9
1900201194.8
1901199194.8
1902211194.8
1903194194.8
1906169194.8
First to last qualifying date each year at Signal For each year, a bar from the first to the last day at Signal meeting 30 C (86 F). 1893: 27 March 1893 to 15 October 18931894: 26 March 1894 to 25 October 18941895: 25 March 1895 to 19 October 18951896: 21 March 1896 to 20 October 18961897: 6 April 1897 to 12 October 18971898: 8 April 1898 to 5 November 18981899: 28 January 1899 to 13 November 18991900: 9 March 1900 to 14 November 19001901: 27 February 1901 to 29 November 19011902: 16 February 1902 to 9 November 19021903: 12 March 1903 to 28 November 19031906: 10 April 1906 to 15 November 1906189318951897189919011903JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Signal meeting 30 C (86 F).
First to last qualifying date each year at Signal
YearFirst dateLast date
18931893-03-271893-10-15
18941894-03-261894-10-25
18951895-03-251895-10-19
18961896-03-211896-10-20
18971897-04-061897-10-12
18981898-04-081898-11-05
18991899-01-281899-11-13
19001900-03-091900-11-14
19011901-02-271901-11-29
19021902-02-161902-11-09
19031903-03-121903-11-28
19061906-04-101906-11-15

Every Fixed Threshold

Fixed thresholds at Signal
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days122111902169
35 C (95 F): Days121511901117
40 C (104 F): Days1298189940
45 C (113 F): Days821190119
90 F (32.2 C): Days121911902147
100 F (37.8 C): Days12121189968
110 F (43.3 C): Days114618991
120 F (48.9 C): Days2119001
0 C (32 F): Frost days (min1278190332
-10 C (14 F): Days with min2519015
20 C (68 F): Tropical nights (min1295189675
25 C (77 F): Days with min1247189822
10 mm (0.39 in): Days with 10 mm or more rain131219061
25 mm (0.98 in): Days with 25 mm or more rain8318931

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1893.

Download the Data

  • Data for Signal 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).