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Built 2026-10-18 (18 October 2026)

Norfolk Station Threshold Days by Year

4 fixed thresholds counted per year at Norfolk Station (ASN00029080): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Norfolk Station Thresholds

  • Norfolk Station: days with 10 mm (0.39 in) or more of precipitation in 39 years, most in 1974 with 32.
  • Norfolk Station: days with 25 mm (0.98 in) or more of precipitation in 38 years, most in 1977 with 14.
  • Norfolk Station: days with 50 mm (1.97 in) or more of precipitation in 30 years, most in 1974 with 6.
  • Norfolk Station: days with 100 mm (3.94 in) or more of precipitation in 11 years, most in 2009 with 2.
  • 4 fixed thresholds have at least one qualifying day at Norfolk Station.
39 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Norfolk Station Days per year at Norfolk Station with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 32 in 1974. 0102030401970: 41971: 191972: 71973: 181974: 321975: 241976: 191977: 271978: 131979: 181980: 61981: 161982: 111983: 131984: 231985: 91986: 111987: 131988: 91989: 151990: 81991: 181992: 81993: 161995: 101996: 111997: 171998: 161999: 192000: 272001: 132002: 72003: 152004: 212005: 162006: 232007: 142008: 82009: 211970197419781982198619901995199920032007
Days per year at Norfolk Station with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 32 in 1974.
Days with 10 mm (0.39 in) or more of precipitation per year at Norfolk Station
YearDaysDecade average
1970418.1
19711918.1
1972718.1
19731818.1
19743218.1
19752418.1
19761918.1
19772718.1
19781318.1
19791818.1
1980612.6
19811612.6
19821112.6
19831312.6
19842312.6
1985912.6
19861112.6
19871312.6
1988912.6
19891512.6
1990813.7
19911813.7
1992813.7
19931613.7
19951013.7
19961113.7
19971713.7
19981613.7
19991913.7
20002716.5
20011316.5
2002716.5
20031516.5
20042116.5
20051616.5
20062316.5
20071416.5
2008816.5
20092116.5
First to last qualifying date each year at Norfolk Station For each year, a bar from the first to the last day at Norfolk Station meeting 10 mm (0.39 in). 1970: 12 January 1970 to 23 December 19701971: 28 January 1971 to 14 December 19711972: 18 February 1972 to 16 March 19721973: 10 January 1973 to 29 December 19731974: 2 January 1974 to 16 December 19741975: 2 January 1975 to 28 December 19751976: 3 January 1976 to 2 November 19761977: 15 January 1977 to 20 December 19771978: 11 January 1978 to 25 December 19781979: 15 January 1979 to 29 December 19791980: 20 January 1980 to 9 December 19801981: 17 January 1981 to 29 December 19811982: 20 January 1982 to 25 December 19821983: 2 January 1983 to 4 December 19831984: 2 January 1984 to 17 December 19841985: 6 February 1985 to 23 December 19851986: 2 January 1986 to 8 December 19861987: 16 January 1987 to 16 December 19871988: 4 January 1988 to 26 December 19881989: 4 January 1989 to 10 December 19891990: 15 January 1990 to 8 December 19901991: 11 January 1991 to 28 December 19911992: 1 January 1992 to 12 May 19921993: 17 January 1993 to 24 December 19931995: 12 January 1995 to 23 December 19951996: 2 January 1996 to 18 December 19961997: 5 January 1997 to 30 December 19971998: 9 February 1998 to 31 December 19981999: 1 January 1999 to 26 December 19992000: 21 January 2000 to 28 December 20002001: 2 January 2001 to 27 November 20012002: 12 January 2002 to 31 December 20022003: 1 January 2003 to 31 December 20032004: 10 January 2004 to 26 December 20042005: 4 January 2005 to 13 December 20052006: 6 January 2006 to 24 December 20062007: 8 January 2007 to 23 December 20072008: 8 February 2008 to 14 December 20082009: 1 January 2009 to 31 December 200919701975198019851990199620012006JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Norfolk Station meeting 10 mm (0.39 in).
First to last qualifying date each year at Norfolk Station
YearFirst dateLast date
19701970-01-121970-12-23
19711971-01-281971-12-14
19721972-02-181972-03-16
19731973-01-101973-12-29
19741974-01-021974-12-16
19751975-01-021975-12-28
19761976-01-031976-11-02
19771977-01-151977-12-20
19781978-01-111978-12-25
19791979-01-151979-12-29
19801980-01-201980-12-09
19811981-01-171981-12-29
19821982-01-201982-12-25
19831983-01-021983-12-04
19841984-01-021984-12-17
19851985-02-061985-12-23
19861986-01-021986-12-08
19871987-01-161987-12-16
19881988-01-041988-12-26
19891989-01-041989-12-10
19901990-01-151990-12-08
19911991-01-111991-12-28
19921992-01-011992-05-12
19931993-01-171993-12-24
19951995-01-121995-12-23
19961996-01-021996-12-18
19971997-01-051997-12-30
19981998-02-091998-12-31
19991999-01-011999-12-26
20002000-01-212000-12-28
20012001-01-022001-11-27
20022002-01-122002-12-31
20032003-01-012003-12-31
20042004-01-102004-12-26
20052005-01-042005-12-13
20062006-01-062006-12-24
20072007-01-082007-12-23
20082008-02-082008-12-14
20092009-01-012009-12-31

Every Fixed Threshold

Fixed thresholds at Norfolk Station
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3932197421
25 mm (0.98 in): Days with 25 mm or more rain3814197712
50 mm (1.97 in): Days with 50 mm or more rain30619744
100 mm (3.94 in): Days with 100 mm or more rain11220092

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1970.

Download the Data

  • Data for Norfolk Station 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

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