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

Monarch Threshold Days by Year (CA003034596)

12 fixed thresholds counted per year at Monarch (CA003034596): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Monarch Thresholds

  • Monarch: days with 10 mm (0.39 in) or more of precipitation in 3 years, most in 1982 with 5.
  • Monarch: days with a maximum temperature at or above 30 C (86 F) in 2 years, most in 1983 with 13.
  • Monarch: days with a maximum temperature at or below 0 C (32 F) in 2 years, most in 1982 with 83.
  • Monarch: nights with a minimum temperature at or below 0 C (32 F) in 2 years, most in 1982 with 199.
  • 12 fixed thresholds have at least one qualifying day at Monarch.
3 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Monarch Days per year at Monarch with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 5 in 1982. 0358101981: 101982: 51983: 4198119821983
Days per year at Monarch with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 5 in 1982.
Days with 10 mm (0.39 in) or more of precipitation per year at Monarch
YearDaysDecade average
1981106.3
198256.3
198346.3
First to last qualifying date each year at Monarch For each year, a bar from the first to the last day at Monarch meeting 10 mm (0.39 in). 1981: 5 May 1981 to 19 September 19811982: 4 June 1982 to 27 September 19821983: 25 April 1983 to 11 August 1983198119821983JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Monarch meeting 10 mm (0.39 in).
First to last qualifying date each year at Monarch
YearFirst dateLast date
19811981-05-051981-09-19
19821982-06-041982-09-27
19831983-04-251983-08-11

Every Fixed Threshold

Fixed thresholds at Monarch
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days213198313
35 C (95 F): Days1119831
90 F (32.2 C): Days1519835
0 C (32 F): Ice days (max283198264
0 C (32 F): Frost days (min21991982192
-10 C (14 F): Days with min296198266
-20 C (-4 F): Days with min241198227
-30 C (-22 F): Days with min215198211
-40 C (-40 F): Days with min1119831
10 mm (0.39 in): Days with 10 mm or more rain3519824
25 mm (0.98 in): Days with 25 mm or more rain2119821
10 cm (3.9 in): Days with 10 cm or more snowfall1119831

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1982.

Download the Data

  • Data for Monarch 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).