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Built 2026-10-19 (19 October 2026)

Chalk Threshold Days by Year (USC00141425)

6 fixed thresholds counted per year at Chalk (USC00141425): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Chalk Thresholds

  • Chalk: days with 10 mm (0.39 in) or more of precipitation in 29 years, most in 1965 with 37.
  • Chalk: days with 25 mm (0.98 in) or more of precipitation in 29 years, most in 1973 with 17.
  • Chalk: days with 50 mm (1.97 in) or more of precipitation in 24 years, most in 2010 with 7.
  • Chalk: days with 10 cm (3.9 in) or more of snowfall in 19 years, most in 1993 with 4.
  • 6 fixed thresholds have at least one qualifying day at Chalk.
29 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Chalk Days per year at Chalk with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 37 in 1965. 0102030401964: 191965: 371966: 121967: 351968: 261969: 291970: 281971: 251972: 211973: 371974: 211975: 251976: 211977: 321978: 211979: 221980: 191981: 271982: 251983: 281986: 291987: 301988: 151989: 181990: 281991: 231994: 201995: 272010: 251964196719701973197619791982198719901995
Days per year at Chalk with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 37 in 1965.
Days with 10 mm (0.39 in) or more of precipitation per year at Chalk
YearDaysDecade average
19641926.3
19653726.3
19661226.3
19673526.3
19682626.3
19692926.3
19702825.3
19712525.3
19722125.3
19733725.3
19742125.3
19752525.3
19762125.3
19773225.3
19782125.3
19792225.3
19801923.9
19812723.9
19822523.9
19832823.9
19862923.9
19873023.9
19881523.9
19891823.9
19902824.5
19912324.5
19942024.5
19952724.5
20102525
First to last qualifying date each year at Chalk For each year, a bar from the first to the last day at Chalk meeting 10 mm (0.39 in). 1964: 9 March 1964 to 16 November 19641965: 1 January 1965 to 24 December 19651966: 11 April 1966 to 28 December 19661967: 26 January 1967 to 18 December 19671968: 1 February 1968 to 19 December 19681969: 24 March 1969 to 6 December 19691970: 1 April 1970 to 9 November 19701971: 3 January 1971 to 18 November 19711972: 24 March 1972 to 30 December 19721973: 3 January 1973 to 4 December 19731974: 10 March 1974 to 7 December 19741975: 10 March 1975 to 30 November 19751976: 21 February 1976 to 30 October 19761977: 3 March 1977 to 9 November 19771978: 13 February 1978 to 30 December 19781979: 19 January 1979 to 21 November 19791980: 19 January 1980 to 8 December 19801981: 25 March 1981 to 30 November 19811982: 30 January 1982 to 27 November 19821983: 2 February 1983 to 27 November 19831986: 12 March 1986 to 7 December 19861987: 5 February 1987 to 27 December 19871988: 1 April 1988 to 27 December 19881989: 28 January 1989 to 28 October 19891990: 17 January 1990 to 9 November 19901991: 2 March 1991 to 23 December 19911994: 10 April 1994 to 6 December 19941995: 27 February 1995 to 30 September 19952010: 9 March 2010 to 12 November 201019641968197219761980198619902010JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Chalk meeting 10 mm (0.39 in).
First to last qualifying date each year at Chalk
YearFirst dateLast date
19641964-03-091964-11-16
19651965-01-011965-12-24
19661966-04-111966-12-28
19671967-01-261967-12-18
19681968-02-011968-12-19
19691969-03-241969-12-06
19701970-04-011970-11-09
19711971-01-031971-11-18
19721972-03-241972-12-30
19731973-01-031973-12-04
19741974-03-101974-12-07
19751975-03-101975-11-30
19761976-02-211976-10-30
19771977-03-031977-11-09
19781978-02-131978-12-30
19791979-01-191979-11-21
19801980-01-191980-12-08
19811981-03-251981-11-30
19821982-01-301982-11-27
19831983-02-021983-11-27
19861986-03-121986-12-07
19871987-02-051987-12-27
19881988-04-011988-12-27
19891989-01-281989-10-28
19901990-01-171990-11-09
19911991-03-021991-12-23
19941994-04-101994-12-06
19951995-02-271995-09-30
20102010-03-092010-11-12

Every Fixed Threshold

Fixed thresholds at Chalk
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain2937196525
25 mm (0.98 in): Days with 25 mm or more rain2917197314
50 mm (1.97 in): Days with 50 mm or more rain24720107
100 mm (3.94 in): Days with 100 mm or more rain3119681
10 cm (3.9 in): Days with 10 cm or more snowfall19419933
25 cm (9.8 in): Days with 25 cm or more snowfall2119711

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1964.

Download the Data

  • Data for Chalk 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).