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

Interior Threshold Days by Year (USC00394179)

16 fixed thresholds counted per year at Interior (USC00394179): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Interior Thresholds

  • Interior: days with 10 mm (0.39 in) or more of precipitation in 8 years, most in 1920 with 21.
  • Interior: days with 25 mm (0.98 in) or more of precipitation in 8 years, most in 1898 with 5.
  • Interior: days with a maximum temperature at or above 30 C (86 F) in 7 years, most in 1898 with 84.
  • Interior: days with a maximum temperature at or above 35 C (95 F) in 7 years, most in 1898 with 44.
  • 16 fixed thresholds have at least one qualifying day at Interior.
7 years with a qualifying day
Days at or above 30 C (86 F) per year at Interior Days per year at Interior with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 84 in 1898. 02550751001898: 841899: 791917: 571918: 571919: 741920: 411921: 651898189919171918191919201921
Days per year at Interior with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 84 in 1898.
Days at or above 30 C (86 F) per year at Interior
YearDaysDecade average
18988481.5
18997981.5
19175762.7
19185762.7
19197462.7
19204153
19216553
First to last qualifying date each year at Interior For each year, a bar from the first to the last day at Interior meeting 30 C (86 F). 1898: 26 April 1898 to 29 September 18981899: 11 June 1899 to 1 October 18991917: 10 June 1917 to 22 September 19171918: 4 May 1918 to 23 September 19181919: 26 May 1919 to 27 September 19191920: 8 June 1920 to 21 September 19201921: 27 May 1921 to 4 September 19211898189919171918191919201921JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Interior meeting 30 C (86 F).
First to last qualifying date each year at Interior
YearFirst dateLast date
18981898-04-261898-09-29
18991899-06-111899-10-01
19171917-06-101917-09-22
19181918-05-041918-09-23
19191919-05-261919-09-27
19201920-06-081920-09-21
19211921-05-271921-09-04

Every Fixed Threshold

Fixed thresholds at Interior
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days784189865
35 C (95 F): Days744189834
40 C (104 F): Days6918981
90 F (32.2 C): Days771189852
100 F (37.8 C): Days723189816
110 F (43.3 C): Days2218981
0 C (32 F): Ice days (max765191929
0 C (32 F): Frost days (min71941898155
-10 C (14 F): Days with min787189855
-20 C (-4 F): Days with min73418994
-30 C (-22 F): Days with min5718992
20 C (68 F): Tropical nights (min71418989
25 C (77 F): Days with min2118981
10 mm (0.39 in): Days with 10 mm or more rain821192011
25 mm (0.98 in): Days with 25 mm or more rain8518981
50 mm (1.97 in): Days with 50 mm or more rain2218981

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1898.

Download the Data

  • Data for Interior 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).