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Data as of 2026-10-16
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Built 2026-10-17 (17 October 2026)

San Juan Threshold Days by Year

7 fixed thresholds counted per year at San Juan (ARM00087311): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Juan Thresholds

  • 7 fixed thresholds have at least one qualifying day at San Juan.
20 years with a qualifying day
Nights at or below 0 C (32 F) per year at San Juan Days per year at San Juan with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. 0204060802001: 242006: 172007: 642008: 452009: 462010: 522011: 522012: 532013: 462014: 402015: 422016: 342017: 432018: 542019: 522020: 552021: 532022: 482023: 262024: 582001200720092011201320152017201920212023
Days per year at San Juan with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line.
Nights at or below 0 C (32 F) per year at San Juan
YearDaysDecade average
20012439.2
20061739.2
20076439.2
20084539.2
20094639.2
20105246.8
20115246.8
20125346.8
20134646.8
20144046.8
20154246.8
20163446.8
20174346.8
20185446.8
20195246.8
20205548
20215348
20224848
20232648
20245848
First to last qualifying date each year at San Juan For each year, a bar from the first to the last day at San Juan meeting 0 C (32 F). 2001: 1 May 2001 to 20 August 20012006: 20 May 2006 to 4 September 20062007: 25 May 2007 to 24 September 20072008: 29 May 2008 to 6 September 20082009: 12 June 2009 to 9 September 20092010: 25 May 2010 to 17 August 20102011: 14 June 2011 to 23 September 20112012: 29 April 2012 to 27 August 20122013: 16 May 2013 to 29 September 20132014: 24 May 2014 to 11 August 20142015: 3 May 2015 to 10 September 20152016: 7 June 2016 to 6 September 20162017: 28 May 2017 to 5 September 20172018: 5 June 2018 to 25 August 20182019: 24 May 2019 to 12 September 20192020: 23 May 2020 to 24 August 20202021: 24 May 2021 to 26 August 20212022: 18 May 2022 to 10 September 20222023: 11 June 2023 to 19 August 20232024: 15 May 2024 to 27 August 20242001200820112014201720202023JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at San Juan meeting 0 C (32 F).
First to last qualifying date each year at San Juan
YearFirst dateLast date
20012001-05-012001-08-20
20062006-05-202006-09-04
20072007-05-252007-09-24
20082008-05-292008-09-06
20092009-06-122009-09-09
20102010-05-252010-08-17
20112011-06-142011-09-23
20122012-04-292012-08-27
20132013-05-162013-09-29
20142014-05-242014-08-11
20152015-05-032015-09-10
20162016-06-072016-09-06
20172017-05-282017-09-05
20182018-06-052018-08-25
20192019-05-242019-09-12
20202020-05-232020-08-24
20212021-05-242021-08-26
20222022-05-182022-09-10
20232023-06-112023-08-19
20242024-05-152024-08-27

Every Fixed Threshold

Fixed thresholds at San Juan
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
0 C (32 F): Frost days (min200n/a58
20 C (68 F): Tropical nights (min200n/a72
25 C (77 F): Days with min190n/a4
10 mm (0.39 in): Days with 10 mm or more rain30n/a3
25 mm (0.98 in): Days with 25 mm or more rain20n/a1
50 mm (1.97 in): Days with 50 mm or more rain20n/a1
100 mm (3.94 in): Days with 100 mm or more rain10n/a1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2001.

Download the Data

  • Data for San Juan 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 (2026-10-16).