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Built 2026-10-19 (19 October 2026)

Pima R4 on W2 Threshold Days by Year (USC00026546)

12 fixed thresholds counted per year at Pima R4 on W2 (USC00026546): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Pima R4 on W2 Thresholds

  • Pima R4 on W2: days with 10 mm (0.39 in) or more of precipitation in 6 years, most in 1901 with 12.
  • Pima R4 on W2: days with a maximum temperature at or above 30 C (86 F) in 3 years, most in 1902 with 183.
  • Pima R4 on W2: days with a maximum temperature at or above 35 C (95 F) in 3 years, most in 1902 with 104.
  • Pima R4 on W2: days with a maximum temperature at or above 40 C (104 F) in 3 years, most in 1900 with 25.
  • 12 fixed thresholds have at least one qualifying day at Pima R4 on W2.
3 years with a qualifying day
Days at or above 30 C (86 F) per year at Pima R4 on W2 Days per year at Pima R4 on W2 with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 183 in 1902. 0501001502001900: 1401901: 1631902: 183190019011902
Days per year at Pima R4 on W2 with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 183 in 1902.
Days at or above 30 C (86 F) per year at Pima R4 on W2
YearDaysDecade average
1900140162
1901163162
1902183162
First to last qualifying date each year at Pima R4 on W2 For each year, a bar from the first to the last day at Pima R4 on W2 meeting 30 C (86 F). 1900: 11 March 1900 to 27 October 19001901: 22 April 1901 to 15 October 19011902: 6 April 1902 to 24 October 1902190019011902JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Pima R4 on W2 meeting 30 C (86 F).
First to last qualifying date each year at Pima R4 on W2
YearFirst dateLast date
19001900-03-111900-10-27
19011901-04-221901-10-15
19021902-04-061902-10-24

Every Fixed Threshold

Fixed thresholds at Pima R4 on W2
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days31831902183
35 C (95 F): Days31041902104
40 C (104 F): Days325190023
90 F (32.2 C): Days31531902153
100 F (37.8 C): Days365190162
110 F (43.3 C): Days2219002
0 C (32 F): Frost days (min31001902100
-10 C (14 F): Days with min1119011
20 C (68 F): Tropical nights (min355190255
25 C (77 F): Days with min230190230
10 mm (0.39 in): Days with 10 mm or more rain61219015
25 mm (0.98 in): Days with 25 mm or more rain3219002

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1900.

Download the Data

  • Data for Pima R4 on W2 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).