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

Clear Lake Dam Threshold Days by Year (USC00041805)

12 fixed thresholds counted per year at Clear Lake Dam (USC00041805): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Clear Lake Dam Thresholds

  • Clear Lake Dam: days with 10 mm (0.39 in) or more of precipitation in 25 years, most in 1941 with 15.
  • Clear Lake Dam: days with 25 mm (0.98 in) or more of precipitation in 13 years, most in 1937 with 3.
  • Clear Lake Dam: nights with a minimum temperature at or below 0 C (32 F) in 6 years, most in 1911 with 188.
  • Clear Lake Dam: nights with a minimum temperature at or below -10 C (14 F) in 6 years, most in 1949 with 55.
  • 12 fixed thresholds have at least one qualifying day at Clear Lake Dam.
5 years with a qualifying day
Days at or above 30 C (86 F) per year at Clear Lake Dam Days per year at Clear Lake Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 59 in 1951. 02040601911: 311912: 211949: 301951: 591952: 4519111912194919511952
Days per year at Clear Lake Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 59 in 1951.
Days at or above 30 C (86 F) per year at Clear Lake Dam
YearDaysDecade average
19113126
19122126
19493030
19515952
19524552
First to last qualifying date each year at Clear Lake Dam For each year, a bar from the first to the last day at Clear Lake Dam meeting 30 C (86 F). 1911: 11 June 1911 to 31 August 19111912: 4 June 1912 to 25 August 19121949: 10 June 1949 to 22 September 19491951: 14 June 1951 to 20 September 19511952: 8 June 1952 to 25 September 195219111912194919511952JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Clear Lake Dam meeting 30 C (86 F).
First to last qualifying date each year at Clear Lake Dam
YearFirst dateLast date
19111911-06-111911-08-31
19121912-06-041912-08-25
19491949-06-101949-09-22
19511951-06-141951-09-20
19521952-06-081952-09-25

Every Fixed Threshold

Fixed thresholds at Clear Lake Dam
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days559195145
35 C (95 F): Days4319112
90 F (32.2 C): Days52519519
0 C (32 F): Ice days (max543194930
0 C (32 F): Frost days (min61881911171
-10 C (14 F): Days with min655194944
-20 C (-4 F): Days with min62619495
-30 C (-22 F): Days with min1719497
10 mm (0.39 in): Days with 10 mm or more rain251519419
25 mm (0.98 in): Days with 25 mm or more rain13319371
50 mm (1.97 in): Days with 50 mm or more rain1119331
10 cm (3.9 in): Days with 10 cm or more snowfall5319523

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1911.

Download the Data

  • Data for Clear Lake Dam 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).