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

St Marys Threshold Days by Year (USC00508105)

10 fixed thresholds counted per year at St Marys (USC00508105): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for St Marys Thresholds

  • St Marys: days with 10 mm (0.39 in) or more of precipitation in 14 years, most in 1974 with 22.
  • St Marys: nights with a minimum temperature at or below 0 C (32 F) in 11 years, most in 1968 with 249.
  • St Marys: nights with a minimum temperature at or below -10 C (14 F) in 11 years, most in 1975 with 139.
  • St Marys: nights with a minimum temperature at or below -20 C (-4 F) in 11 years, most in 1975 with 78.
  • 10 fixed thresholds have at least one qualifying day at St Marys.
11 years with a qualifying day
Nights at or below 0 C (32 F) per year at St Marys Days per year at St Marys with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 249 in 1968. 01002003001968: 2491969: 1941971: 2111972: 2061974: 2381975: 2271978: 2201979: 2141980: 2291981: 2451982: 224196819711974197819801982
Days per year at St Marys with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 249 in 1968.
Nights at or below 0 C (32 F) per year at St Marys
YearDaysDecade average
1968249221.5
1969194221.5
1971211219.3
1972206219.3
1974238219.3
1975227219.3
1978220219.3
1979214219.3
1980229232.7
1981245232.7
1982224232.7
First to last qualifying date each year at St Marys For each year, a bar from the first to the last day at St Marys meeting 0 C (32 F). 1968: 1 January 1968 to 31 December 19681969: 1 January 1969 to 31 December 19691971: 1 January 1971 to 31 December 19711972: 1 January 1972 to 31 December 19721974: 1 January 1974 to 31 December 19741975: 1 January 1975 to 31 December 19751978: 1 January 1978 to 31 December 19781979: 1 January 1979 to 31 December 19791980: 1 January 1980 to 31 December 19801981: 1 January 1981 to 31 December 19811982: 1 January 1982 to 31 December 1982196819711974197819801982JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at St Marys meeting 0 C (32 F).
First to last qualifying date each year at St Marys
YearFirst dateLast date
19681968-01-011968-12-31
19691969-01-011969-12-31
19711971-01-011971-12-31
19721972-01-011972-12-31
19741974-01-011974-12-31
19751975-01-011975-12-31
19781978-01-011978-12-31
19791979-01-011979-12-31
19801980-01-011980-12-31
19811981-01-011981-12-31
19821982-01-011982-12-31

Every Fixed Threshold

Fixed thresholds at St Marys
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
0 C (32 F): Ice days (max101531971136
0 C (32 F): Frost days (min112491968224
-10 C (14 F): Days with min111391975127
-20 C (-4 F): Days with min1178197555
-30 C (-22 F): Days with min113819758
-40 C (-40 F): Days with min6219711
20 C (68 F): Tropical nights (min1219682
10 mm (0.39 in): Days with 10 mm or more rain1422197423
25 mm (0.98 in): Days with 25 mm or more rain6219681
10 cm (3.9 in): Days with 10 cm or more snowfall5219782

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1968.

Download the Data

  • Data for St Marys 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).