Tucson 17 NW Weather Records (USC00028795)
Record envelope, standing records and threshold days for Tucson 17 NW (USC00028795), Arizona, United States, with 45 years of record.
Key Facts for Tucson 17 NW
- Tucson 17 NW (USC00028795) is a weather station in Arizona, United States at 32.25 latitude and -111.20 longitude, 781 m (2,561 ft) above sea level.
- The station reports from 1982 to 2026, 45 years of record.
- 1,464 records set at Tucson 17 NW still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Tucson 17 NW set a daily record low maximum temperature of 23.3 C (73.9 F) on 30 September 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Arizona, United States, 32.25 latitude, -111.20 longitude.
- Elevation: 781 m (2,561 ft).
- Period of record: 1982 to 2026, 45 years.
- Eligible elements: tmax, tmin, prcp.
Daily Record Envelope and 2026
19 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 30.6 C (87.1 F) | -9.4 C (15.1 F) | 24.4 C (75.9 F) | -1.7 C (28.9 F) |
| Feb | 32.2 C (90.0 F) | -7.2 C (19.0 F) | 31.7 C (89.1 F) | 3.3 C (37.9 F) |
| Mar | 38.9 C (102.0 F) | -3.3 C (26.1 F) | 38.9 C (102.0 F) | 5.0 C (41.0 F) |
| Apr | 40.0 C (104.0 F) | -2.8 C (27.0 F) | 33.9 C (93.0 F) | 9.4 C (48.9 F) |
| May | 42.2 C (108.0 F) | 0.6 C (33.1 F) | 40.6 C (105.1 F) | 11.1 C (52.0 F) |
| Jun | 46.7 C (116.1 F) | 4.4 C (39.9 F) | 41.7 C (107.1 F) | 18.3 C (64.9 F) |
| Jul | 45.6 C (114.1 F) | 10.0 C (50.0 F) | 42.8 C (109.0 F) | 19.4 C (66.9 F) |
| Aug | 45.0 C (113.0 F) | 8.9 C (48.0 F) | 42.8 C (109.0 F) | 20.0 C (68.0 F) |
| Sep | 42.8 C (109.0 F) | 7.2 C (45.0 F) | 37.8 C (100.0 F) | 16.1 C (61.0 F) |
| Oct | 41.1 C (106.0 F) | 1.7 C (35.1 F) | 32.8 C (91.0 F) | 15.6 C (60.1 F) |
| Nov | 35.0 C (95.0 F) | -3.3 C (26.1 F) | n/a | n/a |
| Dec | 31.1 C (88.0 F) | -6.1 C (21.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1982 | 15 |
| 1983 | 34 |
| 1984 | 32 |
| 1985 | 44 |
| 1986 | 42 |
| 1987 | 48 |
| 1988 | 38 |
| 1989 | 50 |
| 1990 | 44 |
| 1991 | 34 |
| 1992 | 23 |
| 1993 | 13 |
| 1994 | 33 |
| 1995 | 35 |
| 1996 | 36 |
| 1997 | 21 |
| 1998 | 30 |
| 1999 | 37 |
| 2000 | 40 |
| 2001 | 33 |
| 2002 | 23 |
| 2003 | 37 |
| 2004 | 35 |
| 2005 | 18 |
| 2006 | 30 |
| 2007 | 35 |
| 2008 | 42 |
| 2009 | 34 |
| 2010 | 27 |
| 2011 | 55 |
| 2012 | 40 |
| 2013 | 47 |
| 2014 | 30 |
| 2015 | 24 |
| 2016 | 54 |
| 2017 | 42 |
| 2018 | 35 |
| 2019 | 25 |
| 2020 | 4 |
| 2021 | 3 |
| 2022 | 17 |
| 2023 | 30 |
| 2024 | 36 |
| 2025 | 25 |
| 2026 | 34 |
All-Time Record Progression
3 new records| Date | Kind | Detail |
|---|---|---|
| 2013-01-12 | Record low minimum temperature | Record low minimum temperature -8.3 C (17.1 F) |
| 2013-01-14 | Record low minimum temperature | Record low minimum temperature -9.4 C (15.1 F) |
| 2017-06-21 | Record high maximum temperature | Record high maximum temperature 46.7 C (116.1 F) |
Wettest Day of Each Month
Sep: 86.9 mm (3.4 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 38.1 mm (1.5 in) | 8 January 1993 |
| Feb | 26.7 mm (1.1 in) | 8 February 1994 |
| Mar | 45.7 mm (1.8 in) | 7 March 2000 |
| Apr | 38.4 mm (1.5 in) | 16 April 1988 |
| May | 11.4 mm (0.4 in) | 31 May 1984 |
| Jun | 43.7 mm (1.7 in) | 27 June 2008 |
| Jul | 48.3 mm (1.9 in) | 24 July 2007 |
| Aug | 61.7 mm (2.4 in) | 24 August 1992 |
| Sep | 86.9 mm (3.4 in) | 11 September 1982 |
| Oct | 54.9 mm (2.2 in) | 2 October 1983 |
| Nov | 40.4 mm (1.6 in) | 23 November 2013 |
| Dec | 52.3 mm (2.1 in) | 1 December 2007 |
Period of Record Coverage
1982 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1982 | 237 | 65% | No |
| 1983 | 343 | 94% | Yes |
| 1984 | 330 | 90% | Yes |
| 1985 | 347 | 95% | Yes |
| 1986 | 359 | 98% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 363 | 99% | Yes |
| 1989 | 361 | 99% | Yes |
| 1990 | 353 | 97% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 365 | 100% | Yes |
| 1993 | 320 | 88% | No |
| 1994 | 312 | 85% | No |
| 1995 | 295 | 81% | No |
| 1996 | 292 | 80% | No |
| 1997 | 321 | 88% | No |
| 1998 | 295 | 81% | No |
| 1999 | 335 | 92% | Yes |
| 2000 | 325 | 89% | No |
| 2001 | 357 | 98% | Yes |
| 2002 | 349 | 96% | Yes |
| 2003 | 352 | 96% | Yes |
| 2004 | 348 | 95% | Yes |
| 2005 | 346 | 95% | Yes |
| 2006 | 306 | 84% | No |
| 2007 | 346 | 95% | Yes |
| 2008 | 350 | 96% | Yes |
| 2009 | 274 | 75% | No |
| 2010 | 312 | 85% | No |
| 2011 | 315 | 86% | No |
| 2012 | 295 | 81% | No |
| 2013 | 330 | 90% | Yes |
| 2014 | 341 | 93% | Yes |
| 2015 | 343 | 94% | Yes |
| 2016 | 334 | 91% | Yes |
| 2017 | 332 | 91% | Yes |
| 2018 | 278 | 76% | No |
| 2019 | 306 | 84% | No |
| 2020 | 53 | 14% | No |
| 2021 | 78 | 21% | No |
| 2022 | 278 | 76% | No |
| 2023 | 328 | 90% | No |
| 2024 | 269 | 73% | No |
| 2025 | 213 | 58% | No |
| 2026 | 276 | 76% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 30 September 2026 | Tucson 17 NW, US | daily low max (Provisional) | 23.3 C (73.9 F) | 3.4 C (6.1 F) | 40 years | 26 of 100 (Routine) |
| 30 September 2026 | Tucson 17 NW, US | daily rain (Provisional) | 40.4 mm (1.6 in) | 7.4 mm (0.29 in) | 43 years | 23 of 100 (Routine) |
| 17 September 2026 | Tucson 17 NW, US | daily rain (Provisional) | 36.3 mm (1.4 in) | 12.2 mm (0.5 in) | 7 years | 18 of 100 (Routine) |
| 17 September 2026 | Tucson 17 NW, US | daily low max (Provisional) | 28.9 C (84.0 F) | 1.7 C (3.1 F) | 29 years | 17 of 100 (Routine) |
| 15 September 2026 | Tucson 17 NW, US | daily rain (Provisional) | 27.7 mm (1.1 in) | 22.1 mm (0.9 in) | 36 years | 36 of 100 (Notable) |
| 13 September 2026 | Tucson 17 NW, US | daily rain (Provisional) | 15.0 mm (0.6 in) | 8.6 mm (0.34 in) | 28 years | 20 of 100 (Routine) |
| 1 September 2026 | Tucson 17 NW, US | daily rain (Provisional) | 21.1 mm (0.8 in) | 9.7 mm (0.38 in) | 40 years | 20 of 100 (Routine) |
| 1 September 2026 | Tucson 17 NW, US | daily low max (Provisional) | 27.8 C (82.0 F) | 1.1 C (2.0 F) | 32 years | 16 of 100 (Routine) |
| 31 August 2026 | Tucson 17 NW, US | daily rain (Provisional) | 22.1 mm (0.9 in) | 12.4 mm (0.5 in) | 3 years | 17 of 100 (Routine) |
| 29 August 2026 | Tucson 17 NW, US | daily high min (Provisional) | 27.2 C (81.0 F) | 0.5 C (0.9 F) | 39 years | 16 of 100 (Routine) |
| 28 August 2026 | Tucson 17 NW, US | daily rain (Provisional) | 15.2 mm (0.6 in) | 3.0 mm (0.12 in) | 25 years | 14 of 100 (Routine) |
| 26 August 2026 | Tucson 17 NW, US | daily high min (Provisional) | 27.2 C (81.0 F) | 1.6 C (2.9 F) | 28 years | 17 of 100 (Routine) |
| 19 August 2026 | Tucson 17 NW, US | daily high min (Provisional) | 27.8 C (82.0 F) | 0.6 C (1.1 F) | 32 years | 15 of 100 (Routine) |
| 3 August 2026 | Tucson 17 NW, US | monthly high min | 30.6 C (87.1 F) | 0.6 C (1.1 F) | 0 years | 16 of 100 (Routine) |
| 2 August 2026 | Tucson 17 NW, US | monthly high min | 30.0 C (86.0 F) | 0.6 C (1.1 F) | 32 years | 25 of 100 (Routine) |
| 1 August 2026 | Tucson 17 NW, US | daily high min | 28.9 C (84.0 F) | 0.6 C (1.1 F) | 32 years | 15 of 100 (Routine) |
| 31 July 2026 | Tucson 17 NW, US | daily high min | 27.2 C (81.0 F) | 0.5 C (0.9 F) | 40 years | 17 of 100 (Routine) |
| 31 July 2026 | Tucson 17 NW, US | daily high max (Tie) | 41.7 C (107.1 F) | tie | 40 years | 4 of 100 (Routine) |
| 30 July 2026 | Tucson 17 NW, US | daily high min | 27.8 C (82.0 F) | 1.1 C (2.0 F) | 31 years | 16 of 100 (Routine) |
| 26 July 2026 | Tucson 17 NW, US | daily high min (Tie) | 28.3 C (82.9 F) | tie | 8 years | 1 of 100 (Routine) |
Climate Trend
22 complete years, 1983 to 2023| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1983 | 20.6 C | -0.72 C |
| 1985 | 20.9 C | -0.43 C |
| 1986 | 21.7 C | +0.35 C |
| 1987 | 21.1 C | -0.23 C |
| 1988 | 21.5 C | +0.15 C |
| 1989 | 22.3 C | +0.91 C |
| 1990 | 21.1 C | -0.24 C |
| 1991 | 20.9 C | -0.48 C |
| 1992 | 21.0 C | -0.35 C |
| 1997 | 21.6 C | +0.26 C |
| 1999 | 21.5 C | +0.16 C |
| 2001 | 21.4 C | +0.05 C |
| 2002 | 21.7 C | +0.35 C |
| 2003 | 21.8 C | +0.50 C |
| 2004 | 21.1 C | -0.22 C |
| 2005 | 21.5 C | +0.11 C |
| 2007 | 21.3 C | +0.00 C |
| 2008 | 20.8 C | -0.57 C |
| 2015 | 21.6 C | +0.28 C |
| 2016 | 21.1 C | -0.28 C |
| 2017 | 21.6 C | +0.26 C |
| 2023 | 21.4 C | +0.09 C |
This station does not have enough complete years (30 are needed) to fit a temperature trend.
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1982 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 46.7 C (116.1 F) | 2017 | 43.9 C (111.0 F) | 45 |
| Coldest night (TNn) | -9.4 C (15.1 F) | 2013 | -2.8 C (27.0 F) | 45 |
| Wettest day (Rx1day) | 86.9 mm (3.4 in) | 1982 | 34.3 mm (1.4 in) | 45 |
| Wettest five days (Rx5day) | 177.3 mm (7.0 in) | 1983 | 51.0 mm (2.0 in) | 45 |
| Longest dry spell (CDD) | 119 days | 2002 | 57 days | 45 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1982 | 42.2 C (108.0 F) |
| 1983 | 45.0 C (113.0 F) |
| 1984 | 41.7 C (107.1 F) |
| 1985 | 44.4 C (111.9 F) |
| 1986 | 42.8 C (109.0 F) |
| 1987 | 43.3 C (109.9 F) |
| 1988 | 43.9 C (111.0 F) |
| 1989 | 43.9 C (111.0 F) |
| 1990 | 45.6 C (114.1 F) |
| 1991 | 42.8 C (109.0 F) |
| 1992 | 43.3 C (109.9 F) |
| 1993 | 43.9 C (111.0 F) |
| 1994 | 46.1 C (115.0 F) |
| 1995 | 45.6 C (114.1 F) |
| 1996 | 42.2 C (108.0 F) |
| 1997 | 43.3 C (109.9 F) |
| 1998 | 44.4 C (111.9 F) |
| 1999 | 42.8 C (109.0 F) |
| 2000 | 43.3 C (109.9 F) |
| 2001 | 45.0 C (113.0 F) |
| 2002 | 43.3 C (109.9 F) |
| 2003 | 45.0 C (113.0 F) |
| 2004 | 42.2 C (108.0 F) |
| 2005 | 44.4 C (111.9 F) |
| 2006 | 43.3 C (109.9 F) |
| 2007 | 43.9 C (111.0 F) |
| 2008 | 44.4 C (111.9 F) |
| 2009 | 42.8 C (109.0 F) |
| 2010 | 43.3 C (109.9 F) |
| 2011 | 45.6 C (114.1 F) |
| 2012 | 45.0 C (113.0 F) |
| 2013 | 45.0 C (113.0 F) |
| 2014 | 42.8 C (109.0 F) |
| 2015 | 43.3 C (109.9 F) |
| 2016 | 46.1 C (115.0 F) |
| 2017 | 46.7 C (116.1 F) |
| 2018 | 45.0 C (113.0 F) |
| 2019 | 43.9 C (111.0 F) |
| 2020 | 26.7 C (80.1 F) |
| 2021 | 40.0 C (104.0 F) |
| 2022 | 42.8 C (109.0 F) |
| 2023 | 44.4 C (111.9 F) |
| 2024 | 43.9 C (111.0 F) |
| 2025 | 45.0 C (113.0 F) |
| 2026 | 42.8 C (109.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1982 | -1.1 C (30.0 F) |
| 1983 | -2.2 C (28.0 F) |
| 1984 | -3.3 C (26.1 F) |
| 1985 | -6.1 C (21.0 F) |
| 1986 | -1.7 C (28.9 F) |
| 1987 | -5.6 C (21.9 F) |
| 1988 | -5.0 C (23.0 F) |
| 1989 | -2.8 C (27.0 F) |
| 1990 | -4.4 C (24.1 F) |
| 1991 | -1.7 C (28.9 F) |
| 1992 | -2.2 C (28.0 F) |
| 1993 | -2.2 C (28.0 F) |
| 1994 | -2.2 C (28.0 F) |
| 1995 | -0.6 C (30.9 F) |
| 1996 | -3.3 C (26.1 F) |
| 1997 | -2.2 C (28.0 F) |
| 1998 | -1.7 C (28.9 F) |
| 1999 | -1.1 C (30.0 F) |
| 2000 | -2.2 C (28.0 F) |
| 2001 | -2.2 C (28.0 F) |
| 2002 | -4.4 C (24.1 F) |
| 2003 | -5.0 C (23.0 F) |
| 2004 | -3.3 C (26.1 F) |
| 2005 | -2.2 C (28.0 F) |
| 2006 | -4.4 C (24.1 F) |
| 2007 | -6.7 C (19.9 F) |
| 2008 | -7.2 C (19.0 F) |
| 2009 | 0.0 C (32.0 F) |
| 2010 | -2.8 C (27.0 F) |
| 2011 | -6.7 C (19.9 F) |
| 2012 | -3.3 C (26.1 F) |
| 2013 | -9.4 C (15.1 F) |
| 2014 | -2.2 C (28.0 F) |
| 2015 | -3.9 C (25.0 F) |
| 2016 | -5.6 C (21.9 F) |
| 2017 | -2.2 C (28.0 F) |
| 2018 | 0.6 C (33.1 F) |
| 2019 | -4.4 C (24.1 F) |
| 2020 | -3.9 C (25.0 F) |
| 2021 | 1.7 C (35.1 F) |
| 2022 | -2.8 C (27.0 F) |
| 2023 | -2.8 C (27.0 F) |
| 2024 | -2.2 C (28.0 F) |
| 2025 | 2.2 C (36.0 F) |
| 2026 | -1.7 C (28.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1982 | 86.9 mm (3.4 in) |
| 1983 | 54.9 mm (2.2 in) |
| 1984 | 43.2 mm (1.7 in) |
| 1985 | 20.3 mm (0.8 in) |
| 1986 | 33.0 mm (1.3 in) |
| 1987 | 22.1 mm (0.9 in) |
| 1988 | 49.0 mm (1.9 in) |
| 1989 | 33.0 mm (1.3 in) |
| 1990 | 42.9 mm (1.7 in) |
| 1991 | 44.2 mm (1.7 in) |
| 1992 | 61.7 mm (2.4 in) |
| 1993 | 44.5 mm (1.8 in) |
| 1994 | 26.7 mm (1.1 in) |
| 1995 | 20.3 mm (0.8 in) |
| 1996 | 43.2 mm (1.7 in) |
| 1997 | 24.1 mm (0.9 in) |
| 1998 | 22.6 mm (0.9 in) |
| 1999 | 34.5 mm (1.4 in) |
| 2000 | 45.7 mm (1.8 in) |
| 2001 | 22.9 mm (0.9 in) |
| 2002 | 29.0 mm (1.1 in) |
| 2003 | 29.5 mm (1.2 in) |
| 2004 | 37.3 mm (1.5 in) |
| 2005 | 35.3 mm (1.4 in) |
| 2006 | 45.7 mm (1.8 in) |
| 2007 | 52.3 mm (2.1 in) |
| 2008 | 43.7 mm (1.7 in) |
| 2009 | 27.9 mm (1.1 in) |
| 2010 | 28.4 mm (1.1 in) |
| 2011 | 17.8 mm (0.7 in) |
| 2012 | 34.3 mm (1.4 in) |
| 2013 | 40.4 mm (1.6 in) |
| 2014 | 47.0 mm (1.9 in) |
| 2015 | 38.1 mm (1.5 in) |
| 2016 | 27.9 mm (1.1 in) |
| 2017 | 27.9 mm (1.1 in) |
| 2018 | 29.2 mm (1.1 in) |
| 2019 | 24.1 mm (0.9 in) |
| 2020 | 12.4 mm (0.5 in) |
| 2021 | 14.5 mm (0.6 in) |
| 2022 | 35.3 mm (1.4 in) |
| 2023 | 35.8 mm (1.4 in) |
| 2024 | 30.7 mm (1.2 in) |
| 2025 | 24.9 mm (1.0 in) |
| 2026 | 40.4 mm (1.6 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1982 | 125.5 mm (4.9 in) |
| 1983 | 177.3 mm (7.0 in) |
| 1984 | 83.7 mm (3.3 in) |
| 1985 | 41.6 mm (1.6 in) |
| 1986 | 74.9 mm (2.9 in) |
| 1987 | 31.8 mm (1.3 in) |
| 1988 | 84.6 mm (3.3 in) |
| 1989 | 42.9 mm (1.7 in) |
| 1990 | 77.7 mm (3.1 in) |
| 1991 | 46.7 mm (1.8 in) |
| 1992 | 72.4 mm (2.9 in) |
| 1993 | 93.5 mm (3.7 in) |
| 1994 | 32.8 mm (1.3 in) |
| 1995 | 25.2 mm (1.0 in) |
| 1996 | 43.7 mm (1.7 in) |
| 1997 | 46.0 mm (1.8 in) |
| 1998 | 36.8 mm (1.4 in) |
| 1999 | 63.7 mm (2.5 in) |
| 2000 | 64.4 mm (2.5 in) |
| 2001 | 30.9 mm (1.2 in) |
| 2002 | 61.3 mm (2.4 in) |
| 2003 | 48.4 mm (1.9 in) |
| 2004 | 41.6 mm (1.6 in) |
| 2005 | 81.3 mm (3.2 in) |
| 2006 | 84.8 mm (3.3 in) |
| 2007 | 76.5 mm (3.0 in) |
| 2008 | 61.0 mm (2.4 in) |
| 2009 | 38.6 mm (1.5 in) |
| 2010 | 54.9 mm (2.2 in) |
| 2011 | 39.9 mm (1.6 in) |
| 2012 | 48.0 mm (1.9 in) |
| 2013 | 62.3 mm (2.5 in) |
| 2014 | 52.1 mm (2.1 in) |
| 2015 | 56.9 mm (2.2 in) |
| 2016 | 46.7 mm (1.8 in) |
| 2017 | 32.6 mm (1.3 in) |
| 2018 | 42.9 mm (1.7 in) |
| 2019 | 51.0 mm (2.0 in) |
| 2020 | 12.4 mm (0.5 in) |
| 2021 | 14.5 mm (0.6 in) |
| 2022 | 65.2 mm (2.6 in) |
| 2023 | 53.8 mm (2.1 in) |
| 2024 | 44.1 mm (1.7 in) |
| 2025 | 35.0 mm (1.4 in) |
| 2026 | 79.3 mm (3.1 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1982 | 57 days |
| 1983 | 77 days |
| 1984 | 62 days |
| 1985 | 76 days |
| 1986 | 72 days |
| 1987 | 45 days |
| 1988 | 62 days |
| 1989 | 50 days |
| 1990 | 64 days |
| 1991 | 98 days |
| 1992 | 34 days |
| 1993 | 46 days |
| 1994 | 52 days |
| 1995 | 69 days |
| 1996 | 90 days |
| 1997 | 49 days |
| 1998 | 93 days |
| 1999 | 88 days |
| 2000 | 49 days |
| 2001 | 32 days |
| 2002 | 119 days |
| 2003 | 47 days |
| 2004 | 71 days |
| 2005 | 74 days |
| 2006 | 78 days |
| 2007 | 75 days |
| 2008 | 60 days |
| 2009 | 40 days |
| 2010 | 87 days |
| 2011 | 103 days |
| 2012 | 58 days |
| 2013 | 50 days |
| 2014 | 97 days |
| 2015 | 34 days |
| 2016 | 42 days |
| 2017 | 56 days |
| 2018 | 41 days |
| 2019 | 44 days |
| 2020 | 19 days |
| 2021 | 18 days |
| 2022 | 16 days |
| 2023 | 24 days |
| 2024 | 67 days |
| 2025 | 36 days |
| 2026 | 55 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.
Frost Dates and Growing Season
21 years with a frostAcross 21 years with a frost, the median last spring frost at Tucson 17 NW falls on 7 February and the median first autumn frost on 4 December, which leaves a median of 305 days between them.
| Measure | Median, all years | Earliest period | Recent period (1983 to 2017) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 7 February | n/a | 7 February | n/a | n/a |
| First autumn frost | 4 December | n/a | 4 December | n/a | n/a |
| Growing days | 305 days | n/a | 305 days | n/a | n/a |
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
32 years, 1983 to 2017A day with at least 34.6 mm (1.4 in) of rain is expected about once in 2 years. A day with at least 59.7 mm (2.4 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 34.6 mm (1.4 in) | |
| 5 years | 44.0 mm (1.7 in) | |
| 10 years | 48.9 mm (1.9 in) | |
| 25 years | 54.0 mm (2.1 in) | |
| 50 years | 57.1 mm (2.2 in) | Longer than the 32 years of record |
| 100 years | 59.7 mm (2.4 in) | Longer than the 32 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 32 years of values from 1983 to 2017.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 54.9 mm (2.2 in) in 1983; 52.3 mm (2.1 in) in 2007; 49.0 mm (1.9 in) in 1988.
Download the Data
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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-13).