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Built 2026-10-19 (19 October 2026)

Iliamna AP Threshold Days by Year (USW00025506)

13 fixed thresholds counted per year at Iliamna AP (USW00025506): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Iliamna AP Thresholds

  • Iliamna AP: days with a maximum temperature at or below 0 C (32 F) in 77 years, most in 1956 with 139.
  • Iliamna AP: nights with a minimum temperature at or below 0 C (32 F) in 77 years, most in 1955 with 222.
  • Iliamna AP: nights with a minimum temperature at or below -10 C (14 F) in 77 years, most in 1956 with 125.
  • Iliamna AP: nights with a minimum temperature at or below -20 C (-4 F) in 77 years, most in 1956 with 70.
  • 13 fixed thresholds have at least one qualifying day at Iliamna AP.
3 years with a qualifying day
Days at or above 30 C (86 F) per year at Iliamna AP Days per year at Iliamna AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 2 in 2019. 011221953: 12015: 12019: 2195320152019
Days per year at Iliamna AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 2 in 2019.
Days at or above 30 C (86 F) per year at Iliamna AP
YearDaysDecade average
195311
201511.5
201921.5
First to last qualifying date each year at Iliamna AP For each year, a bar from the first to the last day at Iliamna AP meeting 30 C (86 F). 1953: 27 June 1953 to 27 June 19532015: 16 June 2015 to 16 June 20152019: 4 July 2019 to 5 July 2019195320152019JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Iliamna AP meeting 30 C (86 F).
First to last qualifying date each year at Iliamna AP
YearFirst dateLast date
19531953-06-271953-06-27
20152015-06-162015-06-16
20192019-07-042019-07-05

Every Fixed Threshold

Fixed thresholds at Iliamna AP
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3220192
90 F (32.2 C): Days1119531
0 C (32 F): Ice days (max77139195673
0 C (32 F): Frost days (min772221955120
-10 C (14 F): Days with min77125195674
-20 C (-4 F): Days with min7770195646
-30 C (-22 F): Days with min4722194711
-40 C (-40 F): Days with min2619472
10 mm (0.39 in): Days with 10 mm or more rain7633196711
25 mm (0.98 in): Days with 25 mm or more rain731019614
50 mm (1.97 in): Days with 50 mm or more rain17319851
10 cm (3.9 in): Days with 10 cm or more snowfall481119221
25 cm (9.8 in): Days with 25 cm or more snowfall11119221

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1953.

Download the Data

  • Data for Iliamna AP 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 (2026-10-15).