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Data as of 2025-12-31
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Built 2026-10-18 (18 October 2026)

Rosa Brook Threshold Days by Year

4 fixed thresholds counted per year at Rosa Brook (ASN00009600): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rosa Brook Thresholds

  • Rosa Brook: days with 10 mm (0.39 in) or more of precipitation in 36 years, most in 1926 with 63.
  • Rosa Brook: days with 25 mm (0.98 in) or more of precipitation in 36 years, most in 1996 with 18.
  • Rosa Brook: days with 50 mm (1.97 in) or more of precipitation in 24 years, most in 1932 with 3.
  • Rosa Brook: days with 100 mm (3.94 in) or more of precipitation in 1 years, most in 1934 with 1.
  • 4 fixed thresholds have at least one qualifying day at Rosa Brook.
36 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Rosa Brook Days per year at Rosa Brook with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 63 in 1926. 0204060801925: 391926: 631927: 451928: 471929: 421930: 471931: 451932: 381933: 391934: 381935: 411936: 351937: 481938: 411939: 451940: 241941: 471944: 301945: 531993: 351994: 271995: 391996: 511997: 361998: 451999: 362000: 382001: 182016: 372017: 312018: 302019: 292020: 382021: 382022: 212023: 19192519291933193719411994199820162020
Days per year at Rosa Brook with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 63 in 1926.
Days with 10 mm (0.39 in) or more of precipitation per year at Rosa Brook
YearDaysDecade average
19253947.2
19266347.2
19274547.2
19284747.2
19294247.2
19304741.7
19314541.7
19323841.7
19333941.7
19343841.7
19354141.7
19363541.7
19374841.7
19384141.7
19394541.7
19402438.5
19414738.5
19443038.5
19455338.5
19933538.4
19942738.4
19953938.4
19965138.4
19973638.4
19984538.4
19993638.4
20003828
20011828
20163731.8
20173131.8
20183031.8
20192931.8
20203829
20213829
20222129
20231929
First to last qualifying date each year at Rosa Brook For each year, a bar from the first to the last day at Rosa Brook meeting 10 mm (0.39 in). 1925: 8 March 1925 to 14 November 19251926: 14 February 1926 to 7 November 19261927: 11 January 1927 to 30 October 19271928: 9 January 1928 to 2 November 19281929: 7 February 1929 to 25 December 19291930: 15 April 1930 to 3 November 19301931: 12 April 1931 to 18 December 19311932: 28 March 1932 to 9 November 19321933: 6 March 1933 to 19 October 19331934: 3 January 1934 to 6 November 19341935: 24 February 1935 to 1 December 19351936: 15 April 1936 to 30 September 19361937: 19 April 1937 to 5 December 19371938: 28 February 1938 to 4 December 19381939: 21 January 1939 to 4 October 19391940: 14 May 1940 to 20 October 19401941: 16 March 1941 to 17 November 19411944: 27 March 1944 to 15 December 19441945: 27 March 1945 to 12 November 19451993: 19 March 1993 to 27 October 19931994: 21 May 1994 to 30 September 19941995: 10 May 1995 to 1 November 19951996: 28 March 1996 to 12 December 19961997: 25 February 1997 to 21 November 19971998: 16 January 1998 to 1 December 19981999: 19 March 1999 to 16 October 19992000: 15 January 2000 to 8 November 20002001: 6 May 2001 to 5 December 20012016: 18 January 2016 to 12 December 20162017: 22 March 2017 to 19 December 20172018: 17 January 2018 to 6 December 20182019: 23 January 2019 to 2 November 20192020: 23 February 2020 to 10 November 20202021: 7 February 2021 to 21 October 20212022: 27 March 2022 to 11 November 20222023: 11 April 2023 to 14 September 202319251930193519401994199920182023JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Rosa Brook meeting 10 mm (0.39 in).
First to last qualifying date each year at Rosa Brook
YearFirst dateLast date
19251925-03-081925-11-14
19261926-02-141926-11-07
19271927-01-111927-10-30
19281928-01-091928-11-02
19291929-02-071929-12-25
19301930-04-151930-11-03
19311931-04-121931-12-18
19321932-03-281932-11-09
19331933-03-061933-10-19
19341934-01-031934-11-06
19351935-02-241935-12-01
19361936-04-151936-09-30
19371937-04-191937-12-05
19381938-02-281938-12-04
19391939-01-211939-10-04
19401940-05-141940-10-20
19411941-03-161941-11-17
19441944-03-271944-12-15
19451945-03-271945-11-12
19931993-03-191993-10-27
19941994-05-211994-09-30
19951995-05-101995-11-01
19961996-03-281996-12-12
19971997-02-251997-11-21
19981998-01-161998-12-01
19991999-03-191999-10-16
20002000-01-152000-11-08
20012001-05-062001-12-05
20162016-01-182016-12-12
20172017-03-222017-12-19
20182018-01-172018-12-06
20192019-01-232019-11-02
20202020-02-232020-11-10
20212021-02-072021-10-21
20222022-03-272022-11-11
20232023-04-112023-09-14

Every Fixed Threshold

Fixed thresholds at Rosa Brook
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3663192619
25 mm (0.98 in): Days with 25 mm or more rain361819964
50 mm (1.97 in): Days with 50 mm or more rain24319321
100 mm (3.94 in): Days with 100 mm or more rain1119341

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1925.

Download the Data

  • Data for Rosa Brook 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).