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Data as of 2026-10-17
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Built 2026-10-19 (19 October 2026)

Grand Valley Threshold Days by Year (CA006142990)

14 fixed thresholds counted per year at Grand Valley (CA006142990): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Grand Valley Thresholds

  • Grand Valley: days with 10 mm (0.39 in) or more of precipitation in 9 years, most in 1912 with 30.
  • Grand Valley: days with 25 mm (0.98 in) or more of precipitation in 9 years, most in 1912 with 9.
  • Grand Valley: days with 10 cm (3.9 in) or more of snowfall in 8 years, most in 1912 with 4.
  • Grand Valley: days with a maximum temperature at or above 30 C (86 F) in 4 years, most in 1937 with 19.
  • 14 fixed thresholds have at least one qualifying day at Grand Valley.
4 years with a qualifying day
Days at or above 30 C (86 F) per year at Grand Valley Days per year at Grand Valley with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 19 in 1937. 051015201935: 131936: 161937: 191938: 51935193619371938
Days per year at Grand Valley with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 19 in 1937.
Days at or above 30 C (86 F) per year at Grand Valley
YearDaysDecade average
19351313.3
19361613.3
19371913.3
1938513.3
First to last qualifying date each year at Grand Valley For each year, a bar from the first to the last day at Grand Valley meeting 30 C (86 F). 1935: 5 July 1935 to 20 August 19351936: 7 July 1936 to 15 September 19361937: 31 May 1937 to 3 September 19371938: 24 June 1938 to 15 August 19381935193619371938JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Grand Valley meeting 30 C (86 F).
First to last qualifying date each year at Grand Valley
YearFirst dateLast date
19351935-07-051935-08-20
19361936-07-071936-09-15
19371937-05-311937-09-03
19381938-06-241938-08-15

Every Fixed Threshold

Fixed thresholds at Grand Valley
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days41919375
35 C (95 F): Days1619366
90 F (32.2 C): Days3719361
100 F (37.8 C): Days1119361
0 C (32 F): Ice days (max4102193693
0 C (32 F): Frost days (min41821936160
-10 C (14 F): Days with min473193659
-20 C (-4 F): Days with min427193611
-30 C (-22 F): Days with min2319352
20 C (68 F): Tropical nights (min4819362
10 mm (0.39 in): Days with 10 mm or more rain930191224
25 mm (0.98 in): Days with 25 mm or more rain9919122
50 mm (1.97 in): Days with 50 mm or more rain1119351
10 cm (3.9 in): Days with 10 cm or more snowfall8419122

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1935.

Download the Data

  • Data for Grand Valley 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).