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Data as of 2026-10-16
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Built 2026-10-18 (18 October 2026)

Swanson River Alaska Threshold Days by Year

7 fixed thresholds counted per year at Swanson River Alaska (USR0000ASWA): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Swanson River Alaska Thresholds

  • Swanson River Alaska: days with a maximum temperature at or below 0 C (32 F) in 29 years, most in 1994 with 113.
  • Swanson River Alaska: nights with a minimum temperature at or below 0 C (32 F) in 29 years, most in 2012 with 204.
  • Swanson River Alaska: nights with a minimum temperature at or below -10 C (14 F) in 29 years, most in 2012 with 96.
  • Swanson River Alaska: nights with a minimum temperature at or below -20 C (-4 F) in 27 years, most in 2012 with 28.
  • 7 fixed thresholds have at least one qualifying day at Swanson River Alaska.
5 years with a qualifying day
Days at or above 30 C (86 F) per year at Swanson River Alaska Days per year at Swanson River Alaska with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 7 in 2019. 024681993: 12004: 12013: 12019: 72021: 119932004201320192021
Days per year at Swanson River Alaska with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 7 in 2019.
Days at or above 30 C (86 F) per year at Swanson River Alaska
YearDaysDecade average
199311
200411
201314
201974
202111
First to last qualifying date each year at Swanson River Alaska For each year, a bar from the first to the last day at Swanson River Alaska meeting 30 C (86 F). 1993: 12 July 1993 to 12 July 19932004: 26 June 2004 to 26 June 20042013: 17 June 2013 to 17 June 20132019: 29 June 2019 to 8 July 20192021: 18 July 2021 to 18 July 202119932004201320192021JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Swanson River Alaska meeting 30 C (86 F).
First to last qualifying date each year at Swanson River Alaska
YearFirst dateLast date
19931993-07-121993-07-12
20042004-06-262004-06-26
20132013-06-172013-06-17
20192019-06-292019-07-08
20212021-07-182021-07-18

Every Fixed Threshold

Fixed thresholds at Swanson River Alaska
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days5720191
90 F (32.2 C): Days1220192
0 C (32 F): Ice days (max29113199457
0 C (32 F): Frost days (min292042012104
-10 C (14 F): Days with min2996201254
-20 C (-4 F): Days with min2728201218
-30 C (-22 F): Days with min1120091

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1993.

Download the Data

  • Data for Swanson River Alaska 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-16).