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

Ames Threshold Days by Year (USC00340215)

16 fixed thresholds counted per year at Ames (USC00340215): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ames Thresholds

  • Ames: days with 10 mm (0.39 in) or more of precipitation in 23 years, most in 1897 with 31.
  • Ames: days with 25 mm (0.98 in) or more of precipitation in 23 years, most in 2019 with 16.
  • Ames: days with 50 mm (1.97 in) or more of precipitation in 18 years, most in 2015 with 6.
  • Ames: days with 100 mm (3.94 in) or more of precipitation in 4 years, most in 2019 with 2.
  • 16 fixed thresholds have at least one qualifying day at Ames.
3 years with a qualifying day
Days at or above 30 C (86 F) per year at Ames Days per year at Ames with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 116 in 1900. 0501001501897: 951900: 1161901: 113189719001901
Days per year at Ames with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 116 in 1900.
Days at or above 30 C (86 F) per year at Ames
YearDaysDecade average
18979595
1900116114.5
1901113114.5
First to last qualifying date each year at Ames For each year, a bar from the first to the last day at Ames meeting 30 C (86 F). 1897: 26 March 1897 to 23 September 18971900: 11 March 1900 to 5 October 19001901: 2 March 1901 to 1 October 1901189719001901JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Ames meeting 30 C (86 F).
First to last qualifying date each year at Ames
YearFirst dateLast date
18971897-03-261897-09-23
19001900-03-111900-10-05
19011901-03-021901-10-01

Every Fixed Threshold

Fixed thresholds at Ames
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days31161900113
35 C (95 F): Days365190165
40 C (104 F): Days317190117
90 F (32.2 C): Days398190096
100 F (37.8 C): Days342190142
0 C (32 F): Ice days (max3918977
0 C (32 F): Frost days (min2103189798
-10 C (14 F): Days with min221190021
-20 C (-4 F): Days with min1118971
20 C (68 F): Tropical nights (min262190062
25 C (77 F): Days with min21318971
10 mm (0.39 in): Days with 10 mm or more rain2331189713
25 mm (0.98 in): Days with 25 mm or more rain231620192
50 mm (1.97 in): Days with 50 mm or more rain18620154
100 mm (3.94 in): Days with 100 mm or more rain4220191
10 cm (3.9 in): Days with 10 cm or more snowfall1120101

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1897.

Download the Data

  • Data for Ames 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 (2026-10-12).