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

Port Alsworth Threshold Days by Year (USC00507570)

13 fixed thresholds counted per year at Port Alsworth (USC00507570): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Port Alsworth Thresholds

  • Port Alsworth: days with a maximum temperature at or below 0 C (32 F) in 55 years, most in 1961 with 117.
  • Port Alsworth: nights with a minimum temperature at or below 0 C (32 F) in 54 years, most in 1973 with 251.
  • Port Alsworth: nights with a minimum temperature at or below -10 C (14 F) in 54 years, most in 1972 with 133.
  • Port Alsworth: nights with a minimum temperature at or below -20 C (-4 F) in 54 years, most in 1972 with 86.
  • 13 fixed thresholds have at least one qualifying day at Port Alsworth.
6 years with a qualifying day
Days at or above 30 C (86 F) per year at Port Alsworth Days per year at Port Alsworth with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 5 in 2004. 02461968: 11969: 11987: 12003: 12004: 52013: 2196819691987200320042013
Days per year at Port Alsworth with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 5 in 2004.
Days at or above 30 C (86 F) per year at Port Alsworth
YearDaysDecade average
196811
196911
198711
200313
200453
201322
First to last qualifying date each year at Port Alsworth For each year, a bar from the first to the last day at Port Alsworth meeting 30 C (86 F). 1968: 6 August 1968 to 6 August 19681969: 14 June 1969 to 14 June 19691987: 28 July 1987 to 28 July 19872003: 8 August 2003 to 8 August 20032004: 26 June 2004 to 16 August 20042013: 17 June 2013 to 18 June 2013196819691987200320042013JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Port Alsworth meeting 30 C (86 F).
First to last qualifying date each year at Port Alsworth
YearFirst dateLast date
19681968-08-061968-08-06
19691969-06-141969-06-14
19871987-07-281987-07-28
20032003-08-082003-08-08
20042004-06-262004-08-16
20132013-06-172013-06-18

Every Fixed Threshold

Fixed thresholds at Port Alsworth
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days6520042
0 C (32 F): Ice days (max55117196113
0 C (32 F): Frost days (min54251197331
-10 C (14 F): Days with min54133197211
-20 C (-4 F): Days with min548619723
-30 C (-22 F): Days with min484019755
-40 C (-40 F): Days with min161019691
10 mm (0.39 in): Days with 10 mm or more rain5220196110
25 mm (0.98 in): Days with 25 mm or more rain311220094
50 mm (1.97 in): Days with 50 mm or more rain5420091
10 cm (3.9 in): Days with 10 cm or more snowfall411220067
25 cm (9.8 in): Days with 25 cm or more snowfall15219721
50 cm (19.7 in): Days with 50 cm or more snowfall1120071

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1968.

Download the Data

  • Data for Port Alsworth 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).