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

Grundforsen Threshold Days by Year (SWE00139590)

11 fixed thresholds counted per year at Grundforsen (SWE00139590): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Grundforsen Thresholds

  • Grundforsen: days with a maximum temperature at or below 0 C (32 F) in 67 years, most in 1980 with 127.
  • Grundforsen: nights with a minimum temperature at or below 0 C (32 F) in 67 years, most in 1968 with 255.
  • Grundforsen: nights with a minimum temperature at or below -10 C (14 F) in 67 years, most in 1968 with 121.
  • Grundforsen: nights with a minimum temperature at or below -20 C (-4 F) in 67 years, most in 1985 with 60.
  • 11 fixed thresholds have at least one qualifying day at Grundforsen.
13 years with a qualifying day
Days at or above 30 C (86 F) per year at Grundforsen Days per year at Grundforsen with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 6 in 1947. 02461945: 41947: 61948: 21955: 21958: 11970: 11975: 41982: 51983: 11988: 21991: 12006: 12008: 21945194819581975198319912008
Days per year at Grundforsen with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 6 in 1947.
Days at or above 30 C (86 F) per year at Grundforsen
YearDaysDecade average
194544
194764
194824
195521.5
195811.5
197012.5
197542.5
198252.7
198312.7
198822.7
199111
200611.5
200821.5
First to last qualifying date each year at Grundforsen For each year, a bar from the first to the last day at Grundforsen meeting 30 C (86 F). 1945: 22 June 1945 to 17 July 19451947: 28 June 1947 to 16 August 19471948: 30 July 1948 to 31 July 19481955: 9 July 1955 to 10 July 19551958: 3 July 1958 to 3 July 19581970: 19 June 1970 to 19 June 19701975: 6 August 1975 to 10 August 19751982: 1 August 1982 to 5 August 19821983: 10 July 1983 to 10 July 19831988: 27 June 1988 to 28 June 19881991: 6 July 1991 to 6 July 19912006: 12 June 2006 to 12 June 20062008: 25 July 2008 to 26 July 20081945194819581975198319912008JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Grundforsen meeting 30 C (86 F).
First to last qualifying date each year at Grundforsen
YearFirst dateLast date
19451945-06-221945-07-17
19471947-06-281947-08-16
19481948-07-301948-07-31
19551955-07-091955-07-10
19581958-07-031958-07-03
19701970-06-191970-06-19
19751975-08-061975-08-10
19821982-08-011982-08-05
19831983-07-101983-07-10
19881988-06-271988-06-28
19911991-07-061991-07-06
20062006-06-122006-06-12
20082008-07-252008-07-26

Every Fixed Threshold

Fixed thresholds at Grundforsen
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days13619472
90 F (32.2 C): Days1119471
0 C (32 F): Ice days (max67127198077
0 C (32 F): Frost days (min672551968191
-10 C (14 F): Days with min67121196871
-20 C (-4 F): Days with min6760198518
-30 C (-22 F): Days with min581919874
-40 C (-40 F): Days with min6219662
10 mm (0.39 in): Days with 10 mm or more rain6533200025
25 mm (0.98 in): Days with 25 mm or more rain53619952
50 mm (1.97 in): Days with 50 mm or more rain6219731

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1945.

Download the Data

  • Data for Grundforsen 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).