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

Koslan Threshold Days by Year (RSM00022695)

9 fixed thresholds counted per year at Koslan (RSM00022695): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Koslan Thresholds

  • Koslan: days with 10 mm (0.39 in) or more of precipitation in 41 years, most in 1972 with 9.
  • Koslan: days with 25 mm (0.98 in) or more of precipitation in 25 years, most in 1972 with 1.
  • 9 fixed thresholds have at least one qualifying day at Koslan.
41 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Koslan Days per year at Koslan with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 9 in 1972. 051015201960: 161962: 41963: 101964: 81965: 81967: 131968: 51969: 101970: 81971: 71972: 91973: 101974: 81975: 131976: 91977: 111978: 61979: 61980: 161981: 141982: 101983: 181984: 161985: 81986: 131987: 161988: 41989: 91990: 131991: 161992: 111993: 122016: 92017: 142018: 172019: 182020: 42022: 32023: 62024: 62025: 6196019671972197719821987199220192025
Days per year at Koslan with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 9 in 1972.
Days with 10 mm (0.39 in) or more of precipitation per year at Koslan
YearDaysDecade average
1960169.3
196249.3
1963109.3
196489.3
196589.3
1967139.3
196859.3
1969109.3
197088.7
197178.7
197298.7
1973108.7
197488.7
1975138.7
197698.7
1977118.7
197868.7
197968.7
19801612.4
19811412.4
19821012.4
19831812.4
19841612.4
1985812.4
19861312.4
19871612.4
1988412.4
1989912.4
19901313
19911613
19921113
19931213
2016914.5
20171414.5
20181714.5
20191814.5
202045
202235
202365
202465
202565
First to last qualifying date each year at Koslan For each year, a bar from the first to the last day at Koslan meeting 10 mm (0.39 in). 1960: 18 February 1960 to 29 December 19601962: 12 May 1962 to 16 July 19621963: 17 May 1963 to 1 October 19631964: 18 July 1964 to 27 October 19641965: 22 June 1965 to 14 December 19651967: 15 May 1967 to 3 November 19671968: 14 July 1968 to 26 September 19681969: 11 May 1969 to 4 September 19691970: 1 May 1970 to 8 September 19701971: 11 January 1971 to 31 December 19711972: 19 April 1972 to 12 November 19721973: 4 May 1973 to 10 October 19731974: 4 May 1974 to 20 September 19741975: 18 January 1975 to 3 October 19751976: 3 May 1976 to 10 September 19761977: 22 May 1977 to 12 October 19771978: 15 April 1978 to 8 October 19781979: 19 June 1979 to 21 September 19791980: 22 May 1980 to 19 November 19801981: 17 June 1981 to 27 December 19811982: 6 April 1982 to 20 October 19821983: 9 April 1983 to 27 November 19831984: 20 May 1984 to 3 November 19841985: 28 April 1985 to 31 December 19851986: 16 April 1986 to 27 August 19861987: 9 May 1987 to 26 August 19871988: 22 April 1988 to 25 October 19881989: 11 June 1989 to 24 November 19891990: 21 February 1990 to 18 November 19901991: 25 March 1991 to 27 November 19911992: 16 April 1992 to 30 October 19921993: 21 April 1993 to 15 October 19932016: 17 February 2016 to 31 August 20162017: 4 April 2017 to 15 November 20172018: 15 March 2018 to 25 October 20182019: 6 May 2019 to 11 November 20192020: 4 January 2020 to 17 August 20202022: 9 May 2022 to 16 July 20222023: 26 July 2023 to 18 October 20232024: 18 February 2024 to 1 August 20242025: 24 June 2025 to 21 August 20251960196819741980198619922020JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Koslan meeting 10 mm (0.39 in).
First to last qualifying date each year at Koslan
YearFirst dateLast date
19601960-02-181960-12-29
19621962-05-121962-07-16
19631963-05-171963-10-01
19641964-07-181964-10-27
19651965-06-221965-12-14
19671967-05-151967-11-03
19681968-07-141968-09-26
19691969-05-111969-09-04
19701970-05-011970-09-08
19711971-01-111971-12-31
19721972-04-191972-11-12
19731973-05-041973-10-10
19741974-05-041974-09-20
19751975-01-181975-10-03
19761976-05-031976-09-10
19771977-05-221977-10-12
19781978-04-151978-10-08
19791979-06-191979-09-21
19801980-05-221980-11-19
19811981-06-171981-12-27
19821982-04-061982-10-20
19831983-04-091983-11-27
19841984-05-201984-11-03
19851985-04-281985-12-31
19861986-04-161986-08-27
19871987-05-091987-08-26
19881988-04-221988-10-25
19891989-06-111989-11-24
19901990-02-211990-11-18
19911991-03-251991-11-27
19921992-04-161992-10-30
19931993-04-211993-10-15
20162016-02-172016-08-31
20172017-04-042017-11-15
20182018-03-152018-10-25
20192019-05-062019-11-11
20202020-01-042020-08-17
20222022-05-092022-07-16
20232023-07-262023-10-18
20242024-02-182024-08-01
20252025-06-242025-08-21

Every Fixed Threshold

Fixed thresholds at Koslan
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days10n/a1
0 C (32 F): Ice days (max10n/a43
0 C (32 F): Frost days (min10n/a84
-10 C (14 F): Days with min10n/a30
-20 C (-4 F): Days with min10n/a5
-30 C (-22 F): Days with min10n/a2
10 mm (0.39 in): Days with 10 mm or more rain41919726
25 mm (0.98 in): Days with 25 mm or more rain25119721
50 mm (1.97 in): Days with 50 mm or more rain30n/a1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2025.

Download the Data

  • Data for Koslan 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).