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Built 2026-10-19 (19 October 2026)

Css Lab Threshold Days by Year (USS0020K31S)

11 fixed thresholds counted per year at Css Lab (USS0020K31S): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Css Lab Thresholds

  • Css Lab: days with 10 mm (0.39 in) or more of precipitation in 43 years, most in 1996 with 79.
  • Css Lab: days with 25 mm (0.98 in) or more of precipitation in 43 years, most in 1996 with 41.
  • Css Lab: days with 50 mm (1.97 in) or more of precipitation in 42 years, most in 2017 with 19.
  • Css Lab: days with a maximum temperature at or below 0 C (32 F) in 37 years, most in 2006 with 48.
  • 11 fixed thresholds have at least one qualifying day at Css Lab.
24 years with a qualifying day
Days at or above 30 C (86 F) per year at Css Lab Days per year at Css Lab with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 15 in 2024. 0510151989: 21990: 31993: 11994: 11995: 11996: 12002: 42003: 12006: 12007: 22008: 32013: 32014: 12016: 32017: 62018: 32019: 12020: 52021: 102022: 62023: 52024: 152025: 82026: 419891994200220072014201820212024
Days per year at Css Lab with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 15 in 2024.
Days at or above 30 C (86 F) per year at Css Lab
YearDaysDecade average
198922
199031.4
199311.4
199411.4
199511.4
199611.4
200242.2
200312.2
200612.2
200722.2
200832.2
201332.8
201412.8
201632.8
201762.8
201832.8
201912.8
202057.6
2021107.6
202267.6
202357.6
2024157.6
202587.6
202647.6
First to last qualifying date each year at Css Lab For each year, a bar from the first to the last day at Css Lab meeting 30 C (86 F). 1989: 19 July 1989 to 9 October 19891990: 13 July 1990 to 6 August 19901993: 1 August 1993 to 1 August 19931994: 20 July 1994 to 20 July 19941995: 13 September 1995 to 13 September 19951996: 7 July 1996 to 7 July 19962002: 9 July 2002 to 13 August 20022003: 30 July 2003 to 30 July 20032006: 25 June 2006 to 25 June 20062007: 4 July 2007 to 5 July 20072008: 14 August 2008 to 16 August 20082013: 2 July 2013 to 21 July 20132014: 14 July 2014 to 14 July 20142016: 27 July 2016 to 29 July 20162017: 31 July 2017 to 4 September 20172018: 26 July 2018 to 9 August 20182019: 27 August 2019 to 27 August 20192020: 23 June 2020 to 5 September 20202021: 17 June 2021 to 7 September 20212022: 11 July 2022 to 6 September 20222023: 14 July 2023 to 22 July 20232024: 3 July 2024 to 23 July 20242025: 12 July 2025 to 23 August 20252026: 6 August 2026 to 9 August 202619891994200220072014201820212024JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Css Lab meeting 30 C (86 F).
First to last qualifying date each year at Css Lab
YearFirst dateLast date
19891989-07-191989-10-09
19901990-07-131990-08-06
19931993-08-011993-08-01
19941994-07-201994-07-20
19951995-09-131995-09-13
19961996-07-071996-07-07
20022002-07-092002-08-13
20032003-07-302003-07-30
20062006-06-252006-06-25
20072007-07-042007-07-05
20082008-08-142008-08-16
20132013-07-022013-07-21
20142014-07-142014-07-14
20162016-07-272016-07-29
20172017-07-312017-09-04
20182018-07-262018-08-09
20192019-08-272019-08-27
20202020-06-232020-09-05
20212021-06-172021-09-07
20222022-07-112022-09-06
20232023-07-142023-07-22
20242024-07-032024-07-23
20252025-07-122025-08-23
20262026-08-062026-08-09

Every Fixed Threshold

Fixed thresholds at Css Lab
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days241520244
90 F (32.2 C): Days3420244
0 C (32 F): Ice days (max374820067
0 C (32 F): Frost days (min342152000113
-10 C (14 F): Days with min343320066
-20 C (-4 F): Days with min4220132
10 mm (0.39 in): Days with 10 mm or more rain4379199620
25 mm (0.98 in): Days with 25 mm or more rain4341199614
50 mm (1.97 in): Days with 50 mm or more rain421920177
100 mm (3.94 in): Days with 100 mm or more rain21520171
200 mm (7.87 in): Days with 200 mm or more rain1119971

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1989.

Download the Data

  • Data for Css Lab 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 (2026-10-17).