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Data as of 2025-12-31
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Built 2026-10-15 (15 October 2026)

San Juan Threshold Days by Year

4 fixed thresholds counted per year at San Juan (PE000084721): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Juan Thresholds

  • 4 fixed thresholds have at least one qualifying day at San Juan.
4 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at San Juan Days per year at San Juan with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. 024681977: 11979: 11995: 11996: 71977197919951996
Days per year at San Juan with 10 mm (0.39 in) or more of precipitation, with the decade average as a line.
Days with 10 mm (0.39 in) or more of precipitation per year at San Juan
YearDaysDecade average
197711
197911
199514
199674
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 10 mm (0.39 in). 1977: 6 July 1977 to 6 July 19771979: 3 December 1979 to 3 December 19791995: 21 October 1995 to 21 October 19951996: 15 January 1996 to 26 October 19961977197919951996JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at San Juan meeting 10 mm (0.39 in).
First to last qualifying date each year at San Juan
YearFirst dateLast date
19771977-07-061977-07-06
19791979-12-031979-12-03
19951995-10-211995-10-21
19961996-01-151996-10-26

Every Fixed Threshold

Fixed thresholds at San Juan
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
20 C (68 F): Tropical nights (min20n/a6
10 mm (0.39 in): Days with 10 mm or more rain40n/a7
25 mm (0.98 in): Days with 25 mm or more rain20n/a7
50 mm (1.97 in): Days with 50 mm or more rain20n/a5

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1980.

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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

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