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Data as of 2025-12-31
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Built 2026-10-16 (16 October 2026)

Pima R4 on W2 Weather Records (USC00026546)

Record envelope, standing records and threshold days for Pima R4 on W2 (USC00026546), Arizona, United States, with 54 years of record.

Key Facts for Pima R4 on W2

  • Pima R4 on W2 (USC00026546) is a weather station in Arizona, United States at 32.83 latitude and -110.02 longitude, 1,150 m (3,773 ft) above sea level.
  • The station reports from 1898 to 1951, 54 years of record.
  • 1,460 records set at Pima R4 on W2 still stand.
  • Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

  • Location: Arizona, United States, 32.83 latitude, -110.02 longitude.
  • Elevation: 1,150 m (3,773 ft).
  • Period of record: 1898 to 1951, 54 years.
  • Eligible elements: none yet.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Pima R4 on W2, with 2026 drawn through them The band shows the record high and record low for each calendar day at Pima R4 on W2. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Pima R4 on W2. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Pima R4 on W2, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan26.1 C (79.0 F)-9.4 C (15.1 F)n/an/a
Feb26.1 C (79.0 F)-9.4 C (15.1 F)n/an/a
Mar31.7 C (89.1 F)-4.4 C (24.1 F)n/an/a
Apr35.0 C (95.0 F)-3.3 C (26.1 F)n/an/a
May37.8 C (100.0 F)-2.8 C (27.0 F)n/an/a
Jun44.4 C (111.9 F)3.3 C (37.9 F)n/an/a
Jul42.8 C (109.0 F)9.4 C (48.9 F)n/an/a
Aug41.7 C (107.1 F)8.9 C (48.0 F)n/an/a
Sep38.9 C (102.0 F)4.4 C (39.9 F)n/an/a
Oct35.0 C (95.0 F)-3.9 C (25.0 F)n/an/a
Nov32.2 C (90.0 F)-7.8 C (18.0 F)n/an/a
Dec23.3 C (73.9 F)-10.0 C (14.0 F)n/an/a

Which Years Hold Standing Records

1,460 standing records
Standing records at Pima R4 on W2 by the year they were set 1,460 records at Pima R4 on W2 still stand. 1900 holds the most, with 344. 01002003004001898: 1331899: 3161900: 3441901: 2931902: 3031903: 71189818991900190119021903
1,460 records at Pima R4 on W2 still stand. 1900 holds the most, with 344.
Standing records at Pima R4 on W2 by the year they were set
Year setStanding records
1898133
1899316
1900344
1901293
1902303
190371

Wettest Day of Each Month

Jul: 45.5 mm (1.8 in)
Record daily precipitation for each month at Pima R4 on W2 The wettest day on record for each calendar month at Pima R4 on W2. The most was 45.5 mm (1.8 in) on 10 July 1949. 0204060 Jan: 15.2 mm (0.6 in), 26 January 1901 Jan Feb: 22.9 mm (0.9 in), 7 February 1901 Feb Mar: 31.8 mm (1.3 in), 26 March 1951 Mar Apr: 16.5 mm (0.6 in), 19 April 1951 Apr May: 11.4 mm (0.4 in), 25 May 1901 May Jun: 22.4 mm (0.9 in), 22 June 1950 Jun Jul: 45.5 mm (1.8 in), 10 July 1949 Jul Aug: 40.9 mm (1.6 in), 7 August 1949 Aug Sep: 36.3 mm (1.4 in), 2 September 1900 Sep Oct: 16.0 mm (0.6 in), 20 October 1901 Oct Nov: 25.4 mm (1.0 in), 20 November 1900 Nov Dec: 34.3 mm (1.4 in), 13 December 1902 Dec
The wettest day on record for each calendar month at Pima R4 on W2. The most was 45.5 mm (1.8 in) on 10 July 1949.
Record daily precipitation for each month at Pima R4 on W2
MonthRecord daily precipitation (mm)Date
Jan15.2 mm (0.6 in)26 January 1901
Feb22.9 mm (0.9 in)7 February 1901
Mar31.8 mm (1.3 in)26 March 1951
Apr16.5 mm (0.6 in)19 April 1951
May11.4 mm (0.4 in)25 May 1901
Jun22.4 mm (0.9 in)22 June 1950
Jul45.5 mm (1.8 in)10 July 1949
Aug40.9 mm (1.6 in)7 August 1949
Sep36.3 mm (1.4 in)2 September 1900
Oct16.0 mm (0.6 in)20 October 1901
Nov25.4 mm (1.0 in)20 November 1900
Dec34.3 mm (1.4 in)13 December 1902

Period of Record Coverage

1898 to 1903
Days with data per year at Pima R4 on W2 6 years of record at Pima R4 on W2, 1898 to 1903. 3 years have data for under 90 percent of days and are left out of rankings: 1898, 1899, 1903. 1898: 136 of 365 days1899: 298 of 365 days1900: 349 of 365 days1901: 337 of 365 days1902: 363 of 365 days1903: 90 of 365 days1900
6 years of record at Pima R4 on W2, 1898 to 1903. 3 years have data for under 90 percent of days and are left out of rankings: 1898, 1899, 1903.
Days with data per year at Pima R4 on W2
YearDays with dataShare of yearComplete
189813637%No
189929882%No
190034996%Yes
190133792%Yes
190236399%Yes
19039025%No

Latest Records

0

No records were set at this station in the latest data.

Extremes by Year

1898 to 1951
Yearly extremes at Pima R4 on W2: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)44.4 C (111.9 F)190241.7 C (107.1 F)6
Coldest night (TNn)-10.0 C (14.0 F)1901-9.1 C (15.5 F)6
Wettest day (Rx1day)45.5 mm (1.8 in)194922.9 mm (0.9 in)10
Wettest five days (Rx5day)70.6 mm (2.8 in)194938.6 mm (1.5 in)10
Longest dry spell (CDD)104 days195054 days10

Hottest day (TXx)

Hottest day (TXx) at Pima R4 on W2 by year The hottest day of the year at Pima R4 on W2, 1898 to 1951. The record is 44.4 C (111.9 F) in 1902, marked on the chart; the median year is 41.7 C (107.1 F). 2530354045190019101920193019401950Record: 44.4 C (111.9 F) in 1902
The hottest day of the year at Pima R4 on W2, 1898 to 1951. The record is 44.4 C (111.9 F) in 1902, marked on the chart; the median year is 41.7 C (107.1 F).
Hottest day (TXx) at Pima R4 on W2 by year
YearHottest day (TXx)
189840.0 C (104.0 F)
189940.6 C (105.1 F)
190043.9 C (111.0 F)
190142.8 C (109.0 F)
190244.4 C (111.9 F)
190328.3 C (82.9 F)
1948n/a
1949n/a
1950n/a
1951n/a

Coldest night (TNn)

Coldest night (TNn) at Pima R4 on W2 by year The coldest night of the year at Pima R4 on W2, 1898 to 1951. The record is -10.0 C (14.0 F) in 1901, marked on the chart; the median year is -9.1 C (15.5 F). -10-9-8-7190019101920193019401950Record: -10.0 C (14.0 F) in 1901
The coldest night of the year at Pima R4 on W2, 1898 to 1951. The record is -10.0 C (14.0 F) in 1901, marked on the chart; the median year is -9.1 C (15.5 F).
Coldest night (TNn) at Pima R4 on W2 by year
YearColdest night (TNn)
1898-7.8 C (18.0 F)
1899-9.4 C (15.1 F)
1900-9.4 C (15.1 F)
1901-10.0 C (14.0 F)
1902-7.2 C (19.0 F)
1903-8.9 C (16.0 F)
1948n/a
1949n/a
1950n/a
1951n/a

Wettest day (Rx1day)

Wettest day (Rx1day) at Pima R4 on W2 by year The wettest day of the year at Pima R4 on W2, 1898 to 1951. The record is 45.5 mm (1.8 in) in 1949, marked on the chart; the median year is 22.9 mm (0.9 in). 1020304050190019101920193019401950Record: 45.5 mm (1.8 in) in 1949
The wettest day of the year at Pima R4 on W2, 1898 to 1951. The record is 45.5 mm (1.8 in) in 1949, marked on the chart; the median year is 22.9 mm (0.9 in).
Wettest day (Rx1day) at Pima R4 on W2 by year
YearWettest day (Rx1day)
189822.9 mm (0.9 in)
189915.2 mm (0.6 in)
190036.3 mm (1.4 in)
190122.9 mm (0.9 in)
190234.3 mm (1.4 in)
190321.6 mm (0.9 in)
194817.3 mm (0.7 in)
194945.5 mm (1.8 in)
195022.4 mm (0.9 in)
195131.8 mm (1.3 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Pima R4 on W2 by year The wettest five days of the year at Pima R4 on W2, 1898 to 1951. The record is 70.6 mm (2.8 in) in 1949, marked on the chart; the median year is 38.6 mm (1.5 in). 20406080190019101920193019401950Record: 70.6 mm (2.8 in) in 1949
The wettest five days of the year at Pima R4 on W2, 1898 to 1951. The record is 70.6 mm (2.8 in) in 1949, marked on the chart; the median year is 38.6 mm (1.5 in).
Wettest five days (Rx5day) at Pima R4 on W2 by year
YearWettest five days (Rx5day)
189840.7 mm (1.6 in)
189941.6 mm (1.6 in)
190051.3 mm (2.0 in)
190137.3 mm (1.5 in)
190234.3 mm (1.4 in)
190321.6 mm (0.9 in)
194831.0 mm (1.2 in)
194970.6 mm (2.8 in)
195026.1 mm (1.0 in)
195139.9 mm (1.6 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Pima R4 on W2 by year The longest dry spell of the year at Pima R4 on W2, 1898 to 1951. The record is 104 days in 1950, marked on the chart; the median year is 54 days. 20406080100120190019101920193019401950Record: 104 days in 1950
The longest dry spell of the year at Pima R4 on W2, 1898 to 1951. The record is 104 days in 1950, marked on the chart; the median year is 54 days.
Longest dry spell (CDD) at Pima R4 on W2 by year
YearLongest dry spell (CDD)
189873 days
189941 days
190054 days
190152 days
190253 days
190342 days
194825 days
194967 days
1950104 days
195183 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Download the Data

  • Data for Pima R4 on W2 standing records by year: CSV or JSON. Field meanings are on the data page.
  • 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

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