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

Castle Rock Threshold Days by Year (USC00421222)

12 fixed thresholds counted per year at Castle Rock (USC00421222): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Castle Rock Thresholds

  • Castle Rock: days with 10 mm (0.39 in) or more of precipitation in 7 years, most in 1909 with 17.
  • Castle Rock: days with 25 mm (0.98 in) or more of precipitation in 4 years, most in 1909 with 1.
  • Castle Rock: days with 10 cm (3.9 in) or more of snowfall in 3 years, most in 1956 with 5.
  • Castle Rock: days with a maximum temperature at or above 30 C (86 F) in 2 years, most in 1926 with 24.
  • 12 fixed thresholds have at least one qualifying day at Castle Rock.
7 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Castle Rock Days per year at Castle Rock with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 17 in 1909. 051015201909: 171920: 121922: 131923: 91956: 71957: 71958: 31909192019221923195619571958
Days per year at Castle Rock with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 17 in 1909.
Days with 10 mm (0.39 in) or more of precipitation per year at Castle Rock
YearDaysDecade average
19091717
19201211.3
19221311.3
1923911.3
195675.7
195775.7
195835.7
First to last qualifying date each year at Castle Rock For each year, a bar from the first to the last day at Castle Rock meeting 10 mm (0.39 in). 1909: 5 January 1909 to 1 December 19091920: 25 March 1920 to 28 November 19201922: 22 February 1922 to 25 December 19221923: 27 January 1923 to 8 October 19231956: 25 January 1956 to 11 December 19561957: 25 February 1957 to 29 August 19571958: 13 September 1958 to 15 November 19581909192019221923195619571958JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Castle Rock meeting 10 mm (0.39 in).
First to last qualifying date each year at Castle Rock
YearFirst dateLast date
19091909-01-051909-12-01
19201920-03-251920-11-28
19221922-02-221922-12-25
19231923-01-271923-10-08
19561956-01-251956-12-11
19571957-02-251957-08-29
19581958-09-131958-11-15

Every Fixed Threshold

Fixed thresholds at Castle Rock
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days224192624
35 C (95 F): Days2219251
90 F (32.2 C): Days2919258
0 C (32 F): Ice days (max233192633
0 C (32 F): Frost days (min22541926254
-10 C (14 F): Days with min296192596
-20 C (-4 F): Days with min230192630
-30 C (-22 F): Days with min2119251
10 mm (0.39 in): Days with 10 mm or more rain71719093
25 mm (0.98 in): Days with 25 mm or more rain4119091
10 cm (3.9 in): Days with 10 cm or more snowfall3519562
25 cm (9.8 in): Days with 25 cm or more snowfall1119581

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1925.

Download the Data

  • Data for Castle Rock 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).