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Data as of 2025-12-31
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Built 2026-10-17 (17 October 2026)

Hanworth Threshold Days by Year

4 fixed thresholds counted per year at Hanworth (ASN00036069): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hanworth Thresholds

  • Hanworth: days with 10 mm (0.39 in) or more of precipitation in 11 years, most in 1974 with 28.
  • Hanworth: days with 25 mm (0.98 in) or more of precipitation in 11 years, most in 1974 with 14.
  • Hanworth: days with 50 mm (1.97 in) or more of precipitation in 7 years, most in 1974 with 4.
  • Hanworth: days with 100 mm (3.94 in) or more of precipitation in 1 years, most in 1974 with 1.
  • 4 fixed thresholds have at least one qualifying day at Hanworth.
11 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Hanworth Days per year at Hanworth with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 28 in 1974. 01020301966: 111967: 41968: 81969: 81973: 171974: 281975: 121997: 131998: 171999: 132000: 27196619681973197519982000
Days per year at Hanworth with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 28 in 1974.
Days with 10 mm (0.39 in) or more of precipitation per year at Hanworth
YearDaysDecade average
1966117.8
196747.8
196887.8
196987.8
19731719
19742819
19751219
19971314.3
19981714.3
19991314.3
20002727
First to last qualifying date each year at Hanworth For each year, a bar from the first to the last day at Hanworth meeting 10 mm (0.39 in). 1966: 5 January 1966 to 8 November 19661967: 28 February 1967 to 29 December 19671968: 9 January 1968 to 18 July 19681969: 6 February 1969 to 24 December 19691973: 10 January 1973 to 26 November 19731974: 1 January 1974 to 28 December 19741975: 2 January 1975 to 27 December 19751997: 26 January 1997 to 27 December 19971998: 11 January 1998 to 31 December 19981999: 15 January 1999 to 27 December 19992000: 15 January 2000 to 29 December 2000196619681973197519982000JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Hanworth meeting 10 mm (0.39 in).
First to last qualifying date each year at Hanworth
YearFirst dateLast date
19661966-01-051966-11-08
19671967-02-281967-12-29
19681968-01-091968-07-18
19691969-02-061969-12-24
19731973-01-101973-11-26
19741974-01-011974-12-28
19751975-01-021975-12-27
19971997-01-261997-12-27
19981998-01-111998-12-31
19991999-01-151999-12-27
20002000-01-152000-12-29

Every Fixed Threshold

Fixed thresholds at Hanworth
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain1128197427
25 mm (0.98 in): Days with 25 mm or more rain1114197410
50 mm (1.97 in): Days with 50 mm or more rain7419742
100 mm (3.94 in): Days with 100 mm or more rain1119741

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1966.

Download the Data

  • Data for Hanworth 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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).