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Built 2026-10-19 (19 October 2026)

Polar Threshold Days by Year (USC00417146)

6 fixed thresholds counted per year at Polar (USC00417146): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Polar Thresholds

  • Polar: days with 10 mm (0.39 in) or more of precipitation in 25 years, most in 1941 with 40.
  • Polar: days with 25 mm (0.98 in) or more of precipitation in 24 years, most in 1941 with 13.
  • Polar: days with 50 mm (1.97 in) or more of precipitation in 18 years, most in 1942 with 4.
  • Polar: days with 10 cm (3.9 in) or more of snowfall in 6 years, most in 1963 with 2.
  • 6 fixed thresholds have at least one qualifying day at Polar.
25 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Polar Days per year at Polar with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 40 in 1941. 0102030401941: 401942: 181947: 121949: 121950: 181951: 91952: 111953: 131954: 71955: 211956: 61957: 211958: 111959: 171960: 131962: 101963: 201964: 81965: 151966: 151967: 141968: 201969: 201970: 111971: 21194119491952195519581962196519681971
Days per year at Polar with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 40 in 1941.
Days with 10 mm (0.39 in) or more of precipitation per year at Polar
YearDaysDecade average
19414020.5
19421820.5
19471220.5
19491220.5
19501813.4
1951913.4
19521113.4
19531313.4
1954713.4
19552113.4
1956613.4
19572113.4
19581113.4
19591713.4
19601315
19621015
19632015
1964815
19651515
19661515
19671415
19682015
19692015
19701116
19712116
First to last qualifying date each year at Polar For each year, a bar from the first to the last day at Polar meeting 10 mm (0.39 in). 1941: 31 January 1941 to 10 December 19411942: 1 March 1942 to 10 December 19421947: 10 March 1947 to 3 December 19471949: 23 January 1949 to 24 October 19491950: 16 April 1950 to 26 September 19501951: 17 May 1951 to 8 September 19511952: 27 May 1952 to 18 December 19521953: 8 March 1953 to 25 October 19531954: 12 April 1954 to 14 November 19541955: 4 February 1955 to 3 October 19551956: 4 February 1956 to 19 December 19561957: 7 February 1957 to 3 November 19571958: 22 February 1958 to 14 November 19581959: 7 April 1959 to 17 December 19591960: 5 January 1960 to 10 December 19601962: 5 April 1962 to 28 October 19621963: 30 March 1963 to 30 December 19631964: 30 January 1964 to 10 December 19641965: 9 February 1965 to 18 October 19651966: 21 January 1966 to 27 September 19661967: 31 March 1967 to 18 September 19671968: 19 January 1968 to 27 December 19681969: 14 February 1969 to 29 December 19691970: 6 March 1970 to 17 October 19701971: 17 April 1971 to 2 December 19711941195019541958196319671971JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Polar meeting 10 mm (0.39 in).
First to last qualifying date each year at Polar
YearFirst dateLast date
19411941-01-311941-12-10
19421942-03-011942-12-10
19471947-03-101947-12-03
19491949-01-231949-10-24
19501950-04-161950-09-26
19511951-05-171951-09-08
19521952-05-271952-12-18
19531953-03-081953-10-25
19541954-04-121954-11-14
19551955-02-041955-10-03
19561956-02-041956-12-19
19571957-02-071957-11-03
19581958-02-221958-11-14
19591959-04-071959-12-17
19601960-01-051960-12-10
19621962-04-051962-10-28
19631963-03-301963-12-30
19641964-01-301964-12-10
19651965-02-091965-10-18
19661966-01-211966-09-27
19671967-03-311967-09-18
19681968-01-191968-12-27
19691969-02-141969-12-29
19701970-03-061970-10-17
19711971-04-171971-12-02

Every Fixed Threshold

Fixed thresholds at Polar
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain2540194121
25 mm (0.98 in): Days with 25 mm or more rain2413194110
50 mm (1.97 in): Days with 50 mm or more rain18419422
100 mm (3.94 in): Days with 100 mm or more rain3119551
200 mm (7.87 in): Days with 200 mm or more rain1119551
10 cm (3.9 in): Days with 10 cm or more snowfall6219631

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1941.

Download the Data

  • Data for Polar 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).