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Built 2026-10-19 (19 October 2026)

Port Heiden Threshold Days by Year (USW00025508)

9 fixed thresholds counted per year at Port Heiden (USW00025508): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Port Heiden Thresholds

  • Port Heiden: days with a maximum temperature at or below 0 C (32 F) in 25 years, most in 1975 with 101.
  • Port Heiden: nights with a minimum temperature at or below 0 C (32 F) in 23 years, most in 1948 with 210.
  • Port Heiden: nights with a minimum temperature at or below -10 C (14 F) in 23 years, most in 1975 with 86.
  • Port Heiden: nights with a minimum temperature at or below -20 C (-4 F) in 21 years, most in 1972 with 36.
  • 9 fixed thresholds have at least one qualifying day at Port Heiden.
23 years with a qualifying day
Nights at or below 0 C (32 F) per year at Port Heiden Days per year at Port Heiden with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 210 in 1948. 01002003001943: 1731948: 2101949: 1901950: 1931959: 1611960: 1791961: 1851962: 1851963: 1791964: 1751968: 1641972: 1851974: 1771975: 2101976: 1951978: 1201979: 1271981: 1621985: 1601986: 1391987: 1222025: 1202026: 6219431950196119641974197819852025
Days per year at Port Heiden with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 210 in 1948.
Nights at or below 0 C (32 F) per year at Port Heiden
YearDaysDecade average
1943173191
1948210191
1949190191
1950193177
1959161177
1960179177.8
1961185177.8
1962185177.8
1963179177.8
1964175177.8
1968164177.8
1972185169
1974177169
1975210169
1976195169
1978120169
1979127169
1981162145.8
1985160145.8
1986139145.8
1987122145.8
202512091
20266291
First to last qualifying date each year at Port Heiden For each year, a bar from the first to the last day at Port Heiden meeting 0 C (32 F). 1943: 1 January 1943 to 31 December 19431948: 1 January 1948 to 31 December 19481949: 1 January 1949 to 31 December 19491950: 3 January 1950 to 31 December 19501959: 1 January 1959 to 31 December 19591960: 1 January 1960 to 30 December 19601961: 1 January 1961 to 31 December 19611962: 1 January 1962 to 31 December 19621963: 1 January 1963 to 31 December 19631964: 9 January 1964 to 31 December 19641968: 2 January 1968 to 31 December 19681972: 5 January 1972 to 31 December 19721974: 1 January 1974 to 31 December 19741975: 1 January 1975 to 31 December 19751976: 1 January 1976 to 30 December 19761978: 5 January 1978 to 24 December 19781979: 13 January 1979 to 31 December 19791981: 1 January 1981 to 31 December 19811985: 1 January 1985 to 31 December 19851986: 1 January 1986 to 31 December 19861987: 1 January 1987 to 30 December 19872025: 3 January 2025 to 12 December 20252026: 4 March 2026 to 12 October 202619431950196119641974197819852025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Port Heiden meeting 0 C (32 F).
First to last qualifying date each year at Port Heiden
YearFirst dateLast date
19431943-01-011943-12-31
19481948-01-011948-12-31
19491949-01-011949-12-31
19501950-01-031950-12-31
19591959-01-011959-12-31
19601960-01-011960-12-30
19611961-01-011961-12-31
19621962-01-011962-12-31
19631963-01-011963-12-31
19641964-01-091964-12-31
19681968-01-021968-12-31
19721972-01-051972-12-31
19741974-01-011974-12-31
19751975-01-011975-12-31
19761976-01-011976-12-30
19781978-01-051978-12-24
19791979-01-131979-12-31
19811981-01-011981-12-31
19851985-01-011985-12-31
19861986-01-011986-12-31
19871987-01-011987-12-30
20252025-01-032025-12-12
20262026-03-042026-10-12

Every Fixed Threshold

Fixed thresholds at Port Heiden
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
0 C (32 F): Ice days (max25101197526
0 C (32 F): Frost days (min23210194862
-10 C (14 F): Days with min2386197524
-20 C (-4 F): Days with min213619725
-30 C (-22 F): Days with min3219752
10 mm (0.39 in): Days with 10 mm or more rain172019785
25 mm (0.98 in): Days with 25 mm or more rain11419812
10 cm (3.9 in): Days with 10 cm or more snowfall10819758
25 cm (9.8 in): Days with 25 cm or more snowfall4219862

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1943.

Download the Data

  • Data for Port Heiden 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 (2026-10-17).