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

Granby Threshold Days by Year (USC00233341)

6 fixed thresholds counted per year at Granby (USC00233341): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Granby Thresholds

  • Granby: days with 10 mm (0.39 in) or more of precipitation in 26 years, most in 1945 with 46.
  • Granby: days with 25 mm (0.98 in) or more of precipitation in 26 years, most in 1945 with 23.
  • Granby: days with 50 mm (1.97 in) or more of precipitation in 23 years, most in 1945 with 9.
  • Granby: days with 10 cm (3.9 in) or more of snowfall in 9 years, most in 1948 with 3.
  • 6 fixed thresholds have at least one qualifying day at Granby.
26 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Granby Days per year at Granby with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 46 in 1945. 02040601945: 461947: 241948: 381949: 451950: 351951: 421952: 251953: 291954: 311955: 371956: 271957: 451958: 331959: 371960: 311961: 421962: 341963: 171964: 321965: 321966: 281967: 361968: 391969: 271971: 311972: 27194519491952195519581961196419671971
Days per year at Granby with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 46 in 1945.
Days with 10 mm (0.39 in) or more of precipitation per year at Granby
YearDaysDecade average
19454638.3
19472438.3
19483838.3
19494538.3
19503534.1
19514234.1
19522534.1
19532934.1
19543134.1
19553734.1
19562734.1
19574534.1
19583334.1
19593734.1
19603131.8
19614231.8
19623431.8
19631731.8
19643231.8
19653231.8
19662831.8
19673631.8
19683931.8
19692731.8
19713129
19722729
First to last qualifying date each year at Granby For each year, a bar from the first to the last day at Granby meeting 10 mm (0.39 in). 1945: 12 February 1945 to 18 December 19451947: 14 March 1947 to 15 November 19471948: 1 January 1948 to 29 December 19481949: 10 January 1949 to 31 December 19491950: 4 January 1950 to 3 October 19501951: 3 January 1951 to 25 November 19511952: 2 February 1952 to 19 December 19521953: 2 January 1953 to 3 December 19531954: 20 January 1954 to 29 December 19541955: 2 February 1955 to 7 October 19551956: 2 February 1956 to 20 December 19561957: 22 January 1957 to 25 December 19571958: 26 February 1958 to 31 December 19581959: 21 January 1959 to 27 December 19591960: 4 February 1960 to 11 December 19601961: 8 February 1961 to 17 December 19611962: 15 January 1962 to 20 December 19621963: 5 January 1963 to 11 December 19631964: 5 February 1964 to 19 November 19641965: 1 January 1965 to 25 December 19651966: 1 January 1966 to 10 November 19661967: 27 February 1967 to 21 December 19671968: 28 January 1968 to 28 December 19681969: 16 January 1969 to 30 October 19691971: 3 January 1971 to 30 December 19711972: 12 February 1972 to 30 December 19721945195019541958196219661971JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Granby meeting 10 mm (0.39 in).
First to last qualifying date each year at Granby
YearFirst dateLast date
19451945-02-121945-12-18
19471947-03-141947-11-15
19481948-01-011948-12-29
19491949-01-101949-12-31
19501950-01-041950-10-03
19511951-01-031951-11-25
19521952-02-021952-12-19
19531953-01-021953-12-03
19541954-01-201954-12-29
19551955-02-021955-10-07
19561956-02-021956-12-20
19571957-01-221957-12-25
19581958-02-261958-12-31
19591959-01-211959-12-27
19601960-02-041960-12-11
19611961-02-081961-12-17
19621962-01-151962-12-20
19631963-01-051963-12-11
19641964-02-051964-11-19
19651965-01-011965-12-25
19661966-01-011966-11-10
19671967-02-271967-12-21
19681968-01-281968-12-28
19691969-01-161969-10-30
19711971-01-031971-12-30
19721972-02-121972-12-30

Every Fixed Threshold

Fixed thresholds at Granby
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain2646194527
25 mm (0.98 in): Days with 25 mm or more rain262319459
50 mm (1.97 in): Days with 50 mm or more rain23919454
100 mm (3.94 in): Days with 100 mm or more rain4219722
10 cm (3.9 in): Days with 10 cm or more snowfall9319481
25 cm (9.8 in): Days with 25 cm or more snowfall1119511

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 Granby 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).