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

Arroyo Seco Threshold Days by Year (USC00040322)

5 fixed thresholds counted per year at Arroyo Seco (USC00040322): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Arroyo Seco Thresholds

  • Arroyo Seco: days with 10 mm (0.39 in) or more of precipitation in 14 years, most in 1941 with 35.
  • Arroyo Seco: days with 25 mm (0.98 in) or more of precipitation in 14 years, most in 1941 with 16.
  • Arroyo Seco: days with 50 mm (1.97 in) or more of precipitation in 11 years, most in 1926 with 8.
  • Arroyo Seco: days with 100 mm (3.94 in) or more of precipitation in 6 years, most in 1926 with 1.
  • 5 fixed thresholds have at least one qualifying day at Arroyo Seco.
14 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Arroyo Seco Days per year at Arroyo Seco with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 35 in 1941. 0102030401915: 201926: 181927: 181928: 141930: 191931: 131936: 201938: 181939: 71940: 291941: 351945: 121946: 171947: 41915192719301936193919411946
Days per year at Arroyo Seco with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 35 in 1941.
Days with 10 mm (0.39 in) or more of precipitation per year at Arroyo Seco
YearDaysDecade average
19152020
19261816.7
19271816.7
19281416.7
19301915.4
19311315.4
19362015.4
19381815.4
1939715.4
19402919.4
19413519.4
19451219.4
19461719.4
1947419.4
First to last qualifying date each year at Arroyo Seco For each year, a bar from the first to the last day at Arroyo Seco meeting 10 mm (0.39 in). 1915: 2 January 1915 to 13 December 19151926: 29 January 1926 to 3 December 19261927: 5 January 1927 to 26 December 19271928: 23 January 1928 to 13 December 19281930: 4 January 1930 to 12 December 19301931: 1 January 1931 to 26 December 19311936: 9 January 1936 to 31 December 19361938: 16 January 1938 to 21 December 19381939: 5 January 1939 to 23 December 19391940: 1 January 1940 to 22 December 19401941: 4 January 1941 to 31 December 19411945: 1 February 1945 to 23 December 19451946: 3 February 1946 to 27 December 19461947: 28 January 1947 to 5 December 19471915192719301936193919411946JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Arroyo Seco meeting 10 mm (0.39 in).
First to last qualifying date each year at Arroyo Seco
YearFirst dateLast date
19151915-01-021915-12-13
19261926-01-291926-12-03
19271927-01-051927-12-26
19281928-01-231928-12-13
19301930-01-041930-12-12
19311931-01-011931-12-26
19361936-01-091936-12-31
19381938-01-161938-12-21
19391939-01-051939-12-23
19401940-01-011940-12-22
19411941-01-041941-12-31
19451945-02-011945-12-23
19461946-02-031946-12-27
19471947-01-281947-12-05

Every Fixed Threshold

Fixed thresholds at Arroyo Seco
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain143519414
25 mm (0.98 in): Days with 25 mm or more rain141619411
50 mm (1.97 in): Days with 50 mm or more rain11819267
100 mm (3.94 in): Days with 100 mm or more rain6119261
200 mm (7.87 in): Days with 200 mm or more rain1119401

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1915.

Download the Data

  • Data for Arroyo Seco 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).