Flagstaff 4 SW Weather Records (USC00023009)
Record envelope, standing records and threshold days for Flagstaff 4 SW (USC00023009), Arizona, United States, with 43 years of record.
Key Facts for Flagstaff 4 SW
- Flagstaff 4 SW (USC00023009) is a weather station in Arizona, United States at 35.16 latitude and -111.73 longitude, 2,172 m (7,125 ft) above sea level.
- The station reports from 1984 to 2026, 43 years of record.
- 1,464 records set at Flagstaff 4 SW still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Flagstaff 4 SW set a daily record high maximum temperature of 31.7 C (89.1 F) on 26 August 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, 35.16 latitude, -111.73 longitude.
- Elevation: 2,172 m (7,125 ft).
- Period of record: 1984 to 2026, 43 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
22 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 17.2 C (63.0 F) | -33.3 C (-27.9 F) | 16.1 C (61.0 F) | -17.2 C (1.0 F) |
| Feb | 21.1 C (70.0 F) | -38.3 C (-36.9 F) | 20.0 C (68.0 F) | -21.1 C (-6.0 F) |
| Mar | 28.3 C (82.9 F) | -27.8 C (-18.0 F) | 28.3 C (82.9 F) | -11.1 C (12.0 F) |
| Apr | 26.7 C (80.1 F) | -20.0 C (-4.0 F) | 20.0 C (68.0 F) | -8.9 C (16.0 F) |
| May | 30.6 C (87.1 F) | -13.3 C (8.1 F) | 27.8 C (82.0 F) | -6.1 C (21.0 F) |
| Jun | 34.4 C (93.9 F) | -8.3 C (17.1 F) | 31.1 C (88.0 F) | -1.7 C (28.9 F) |
| Jul | 35.6 C (96.1 F) | -3.9 C (25.0 F) | 32.8 C (91.0 F) | -2.8 C (27.0 F) |
| Aug | 33.9 C (93.0 F) | -3.3 C (26.1 F) | 31.7 C (89.1 F) | 5.0 C (41.0 F) |
| Sep | 32.8 C (91.0 F) | -7.8 C (18.0 F) | n/a | n/a |
| Oct | 28.3 C (82.9 F) | -20.0 C (-4.0 F) | n/a | n/a |
| Nov | 22.8 C (73.0 F) | -28.3 C (-18.9 F) | n/a | n/a |
| Dec | 19.4 C (66.9 F) | -37.8 C (-36.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1984 | 29 |
| 1985 | 57 |
| 1986 | 45 |
| 1987 | 51 |
| 1988 | 32 |
| 1989 | 59 |
| 1990 | 54 |
| 1991 | 45 |
| 1992 | 27 |
| 1993 | 19 |
| 1994 | 33 |
| 1995 | 41 |
| 1996 | 60 |
| 1997 | 24 |
| 1998 | 27 |
| 1999 | 43 |
| 2000 | 41 |
| 2001 | 28 |
| 2002 | 32 |
| 2003 | 41 |
| 2004 | 18 |
| 2005 | 20 |
| 2006 | 32 |
| 2007 | 26 |
| 2008 | 27 |
| 2009 | 27 |
| 2010 | 32 |
| 2011 | 33 |
| 2012 | 17 |
| 2013 | 37 |
| 2014 | 24 |
| 2015 | 36 |
| 2016 | 32 |
| 2017 | 49 |
| 2018 | 24 |
| 2019 | 33 |
| 2020 | 32 |
| 2021 | 41 |
| 2022 | 30 |
| 2023 | 28 |
| 2024 | 21 |
| 2025 | 38 |
| 2026 | 19 |
All-Time Record Progression
4 new records| Date | Kind | Detail |
|---|---|---|
| 2017-01-25 | Record daily snowfall | Record daily snowfall 62.2 cm (24.5 in) |
| 2019-11-29 | Record daily precipitation | Record daily precipitation 80.0 mm (3.1 in) |
| 2023-01-16 | Record daily precipitation | Record daily precipitation 100.6 mm (4.0 in) |
| 2024-02-09 | Record daily snowfall | Record daily snowfall 91.4 cm (36.0 in) |
Wettest Day of Each Month
Jan: 100.6 mm (4.0 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 100.6 mm (4.0 in) | 16 January 2023 |
| Feb | 73.9 mm (2.9 in) | 20 February 1993 |
| Mar | 57.2 mm (2.3 in) | 2 March 1991 |
| Apr | 33.0 mm (1.3 in) | 24 April 1990 |
| May | 24.1 mm (0.9 in) | 29 May 1990 |
| Jun | 27.9 mm (1.1 in) | 30 June 2000 |
| Jul | 43.9 mm (1.7 in) | 29 July 2017 |
| Aug | 62.0 mm (2.4 in) | 1 August 2010 |
| Sep | 44.5 mm (1.8 in) | 26 September 1997 |
| Oct | 60.2 mm (2.4 in) | 25 October 1992 |
| Nov | 80.0 mm (3.1 in) | 29 November 2019 |
| Dec | 65.3 mm (2.6 in) | 7 December 2009 |
Period of Record Coverage
1984 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1984 | 243 | 66% | No |
| 1985 | 363 | 99% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 333 | 91% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 364 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 365 | 100% | Yes |
| 1993 | 363 | 99% | Yes |
| 1994 | 365 | 100% | Yes |
| 1995 | 361 | 99% | Yes |
| 1996 | 362 | 99% | Yes |
| 1997 | 350 | 96% | Yes |
| 1998 | 318 | 87% | No |
| 1999 | 357 | 98% | Yes |
| 2000 | 356 | 97% | Yes |
| 2001 | 360 | 99% | Yes |
| 2002 | 361 | 99% | Yes |
| 2003 | 356 | 98% | Yes |
| 2004 | 362 | 99% | Yes |
| 2005 | 360 | 99% | Yes |
| 2006 | 356 | 98% | Yes |
| 2007 | 336 | 92% | Yes |
| 2008 | 359 | 98% | Yes |
| 2009 | 319 | 87% | No |
| 2010 | 362 | 99% | Yes |
| 2011 | 360 | 99% | Yes |
| 2012 | 351 | 96% | Yes |
| 2013 | 351 | 96% | Yes |
| 2014 | 322 | 88% | No |
| 2015 | 346 | 95% | Yes |
| 2016 | 361 | 99% | Yes |
| 2017 | 363 | 99% | Yes |
| 2018 | 345 | 95% | Yes |
| 2019 | 334 | 92% | Yes |
| 2020 | 300 | 82% | No |
| 2021 | 359 | 98% | Yes |
| 2022 | 364 | 100% | Yes |
| 2023 | 364 | 100% | Yes |
| 2024 | 363 | 99% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 243 | 67% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 26 August 2026 | Flagstaff 4 SW, US | daily high max (Provisional) | 31.7 C (89.1 F) | 1.7 C (3.1 F) | 24 years | 16 of 100 (Routine) |
| 10 August 2026 | Flagstaff 4 SW, US | daily rain | 35.6 mm (1.4 in) | 15.3 mm (0.6 in) | 20 years | 27 of 100 (Routine) |
| 9 August 2026 | Flagstaff 4 SW, US | daily high max (Tie) | 31.1 C (88.0 F) | tie | 0 years | 1 of 100 (Routine) |
| 3 August 2026 | Flagstaff 4 SW, US | daily high max | 31.7 C (89.1 F) | 0.6 C (1.1 F) | 17 years | 11 of 100 (Routine) |
| 18 July 2026 | Flagstaff 4 SW, US | daily low max | 20.6 C (69.1 F) | 1.1 C (2.0 F) | 39 years | 18 of 100 (Routine) |
| 17 July 2026 | Flagstaff 4 SW, US | daily low max | 20.0 C (68.0 F) | 0.6 C (1.1 F) | 40 years | 17 of 100 (Routine) |
| 30 June 2026 | Flagstaff 4 SW, US | daily low max (Tie) | 21.7 C (71.1 F) | tie | 40 years | 4 of 100 (Routine) |
| 28 June 2026 | Flagstaff 4 SW, US | daily high min | 13.3 C (55.9 F) | 2.7 C (4.9 F) | 37 years | 21 of 100 (Routine) |
| 15 June 2026 | Flagstaff 4 SW, US | daily rain | 12.7 mm (0.5 in) | 12.7 mm (0.5 in) | 41 years | 20 of 100 (Routine) |
| 26 May 2026 | Flagstaff 4 SW, US | daily rain | 17.8 mm (0.7 in) | 15.8 mm (0.6 in) | 27 years | 20 of 100 (Routine) |
| 11 May 2026 | Flagstaff 4 SW, US | daily high max | 26.7 C (80.1 F) | 0.6 C (1.1 F) | 29 years | 13 of 100 (Routine) |
| 10 May 2026 | Flagstaff 4 SW, US | daily high max (Tie) | 25.0 C (77.0 F) | tie | 41 years | 4 of 100 (Routine) |
| 1 April 2026 | Flagstaff 4 SW, US | daily high min (Tie) | 2.2 C (36.0 F) | tie | 11 years | 1 of 100 (Routine) |
| 31 March 2026 | Flagstaff 4 SW, US | monthly high min (Tie) | 5.6 C (42.1 F) | tie | 5 years | 3 of 100 (Routine) |
| 28 March 2026 | Flagstaff 4 SW, US | daily high max (Tie) | 20.6 C (69.1 F) | tie | 40 years | 4 of 100 (Routine) |
| 27 March 2026 | Flagstaff 4 SW, US | daily high max | 23.9 C (75.0 F) | 2.8 C (5.0 F) | 11 years | 12 of 100 (Routine) |
| 26 March 2026 | Flagstaff 4 SW, US | daily high max | 22.8 C (73.0 F) | 1.7 C (3.1 F) | 37 years | 18 of 100 (Routine) |
| 25 March 2026 | Flagstaff 4 SW, US | daily high max | 25.0 C (77.0 F) | 3.9 C (7.0 F) | 4 years | 12 of 100 (Routine) |
| 24 March 2026 | Flagstaff 4 SW, US | daily high max | 23.9 C (75.0 F) | 2.8 C (5.0 F) | 0 years | 9 of 100 (Routine) |
| 23 March 2026 | Flagstaff 4 SW, US | daily high max | 22.8 C (73.0 F) | 1.7 C (3.1 F) | 21 years | 13 of 100 (Routine) |
Climate Trend
32 complete years, 1986 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1986 | 6.2 C | -0.46 C |
| 1988 | 5.7 C | -1.01 C |
| 1989 | 6.2 C | -0.55 C |
| 1990 | 5.4 C | -1.35 C |
| 1991 | 5.5 C | -1.19 C |
| 1992 | 5.3 C | -1.41 C |
| 1993 | 5.8 C | -0.91 C |
| 1994 | 6.6 C | -0.12 C |
| 1995 | 6.9 C | +0.15 C |
| 1996 | 7.4 C | +0.68 C |
| 1997 | 6.3 C | -0.39 C |
| 1999 | 6.0 C | -0.68 C |
| 2000 | 6.8 C | +0.09 C |
| 2001 | 7.0 C | +0.29 C |
| 2002 | 7.0 C | +0.26 C |
| 2003 | 7.7 C | +1.02 C |
| 2004 | 6.5 C | -0.19 C |
| 2005 | 7.4 C | +0.66 C |
| 2006 | 7.1 C | +0.40 C |
| 2007 | 7.3 C | +0.55 C |
| 2008 | 6.6 C | -0.08 C |
| 2010 | 6.4 C | -0.26 C |
| 2011 | 6.7 C | -0.03 C |
| 2013 | 6.1 C | -0.59 C |
| 2015 | 7.9 C | +1.20 C |
| 2016 | 7.7 C | +0.98 C |
| 2017 | 8.3 C | +1.61 C |
| 2021 | 7.0 C | +0.29 C |
| 2022 | 7.0 C | +0.30 C |
| 2023 | 6.2 C | -0.52 C |
| 2024 | 7.2 C | +0.50 C |
| 2025 | 7.6 C | +0.85 C |
The annual mean temperature here has risen by 0.4 C (0.2 to 0.6) per decade over 1986 to 2025. In Fahrenheit: 0.7 F (0.3 to 1.0) per decade. The slope is a straight line fitted to 32 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.4 C (0.2 to 0.6) per decade | 0.7 F (0.3 to 1.0) per decade | 1986 to 2025 | 32 | Rise |
| Mean daily maximum | 0.20 C (-0.02 to 0.42) per decade | 0.36 F (-0.04 to 0.76) per decade | 1986 to 2025 | 32 | Not clearly different from zero |
| Mean daily minimum | 0.6 C (0.3 to 0.8) per decade | 1.0 F (0.6 to 1.4) per decade | 1986 to 2025 | 32 | Rise |
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
1984 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 35.6 C (96.1 F) | 2003 | 32.8 C (91.0 F) | 43 |
| Coldest night (TNn) | -38.3 C (-36.9 F) | 1985 | -26.1 C (-15.0 F) | 43 |
| Wettest day (Rx1day) | 100.6 mm (4.0 in) | 2023 | 43.9 mm (1.7 in) | 43 |
| Wettest five days (Rx5day) | 178.0 mm (7.0 in) | 2023 | 69.0 mm (2.7 in) | 43 |
| Longest dry spell (CDD) | 116 days | 2022 | 44 days | 43 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1984 | 35.0 C (95.0 F) |
| 1985 | 33.3 C (91.9 F) |
| 1986 | 32.2 C (90.0 F) |
| 1987 | 30.6 C (87.1 F) |
| 1988 | 31.7 C (89.1 F) |
| 1989 | 35.0 C (95.0 F) |
| 1990 | 32.8 C (91.0 F) |
| 1991 | 31.1 C (88.0 F) |
| 1992 | 30.6 C (87.1 F) |
| 1993 | 32.8 C (91.0 F) |
| 1994 | 33.3 C (91.9 F) |
| 1995 | 33.3 C (91.9 F) |
| 1996 | 34.4 C (93.9 F) |
| 1997 | 32.2 C (90.0 F) |
| 1998 | 34.4 C (93.9 F) |
| 1999 | 31.7 C (89.1 F) |
| 2000 | 33.3 C (91.9 F) |
| 2001 | 31.7 C (89.1 F) |
| 2002 | 33.3 C (91.9 F) |
| 2003 | 35.6 C (96.1 F) |
| 2004 | 30.6 C (87.1 F) |
| 2005 | 34.4 C (93.9 F) |
| 2006 | 32.2 C (90.0 F) |
| 2007 | 35.6 C (96.1 F) |
| 2008 | 31.1 C (88.0 F) |
| 2009 | 33.3 C (91.9 F) |
| 2010 | 32.2 C (90.0 F) |
| 2011 | 32.2 C (90.0 F) |
| 2012 | 30.6 C (87.1 F) |
| 2013 | 34.4 C (93.9 F) |
| 2014 | 31.1 C (88.0 F) |
| 2015 | 31.7 C (89.1 F) |
| 2016 | 34.4 C (93.9 F) |
| 2017 | 33.3 C (91.9 F) |
| 2018 | 32.2 C (90.0 F) |
| 2019 | 31.7 C (89.1 F) |
| 2020 | 33.9 C (93.0 F) |
| 2021 | 34.4 C (93.9 F) |
| 2022 | 31.7 C (89.1 F) |
| 2023 | 34.4 C (93.9 F) |
| 2024 | 32.8 C (91.0 F) |
| 2025 | 33.3 C (91.9 F) |
| 2026 | 32.8 C (91.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1984 | -26.1 C (-15.0 F) |
| 1985 | -38.3 C (-36.9 F) |
| 1986 | -29.4 C (-20.9 F) |
| 1987 | -33.3 C (-27.9 F) |
| 1988 | -32.2 C (-26.0 F) |
| 1989 | -31.1 C (-24.0 F) |
| 1990 | -37.8 C (-36.0 F) |
| 1991 | -26.1 C (-15.0 F) |
| 1992 | -28.9 C (-20.0 F) |
| 1993 | -26.1 C (-15.0 F) |
| 1994 | -27.8 C (-18.0 F) |
| 1995 | -26.1 C (-15.0 F) |
| 1996 | -22.2 C (-8.0 F) |
| 1997 | -27.8 C (-18.0 F) |
| 1998 | -25.6 C (-14.1 F) |
| 1999 | -26.1 C (-15.0 F) |
| 2000 | -26.1 C (-15.0 F) |
| 2001 | -26.1 C (-15.0 F) |
| 2002 | -25.0 C (-13.0 F) |
| 2003 | -19.4 C (-2.9 F) |
| 2004 | -26.1 C (-15.0 F) |
| 2005 | -25.0 C (-13.0 F) |
| 2006 | -21.7 C (-7.1 F) |
| 2007 | -29.4 C (-20.9 F) |
| 2008 | -27.8 C (-18.0 F) |
| 2009 | -26.1 C (-15.0 F) |
| 2010 | -23.3 C (-9.9 F) |
| 2011 | -32.2 C (-26.0 F) |
| 2012 | -24.4 C (-11.9 F) |
| 2013 | -29.4 C (-20.9 F) |
| 2014 | -17.2 C (1.0 F) |
| 2015 | -24.4 C (-11.9 F) |
| 2016 | -27.2 C (-17.0 F) |
| 2017 | -25.6 C (-14.1 F) |
| 2018 | -23.3 C (-9.9 F) |
| 2019 | -26.1 C (-15.0 F) |
| 2020 | -20.6 C (-5.1 F) |
| 2021 | -20.0 C (-4.0 F) |
| 2022 | -26.1 C (-15.0 F) |
| 2023 | -29.4 C (-20.9 F) |
| 2024 | -25.0 C (-13.0 F) |
| 2025 | -21.1 C (-6.0 F) |
| 2026 | -21.1 C (-6.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1984 | 42.7 mm (1.7 in) |
| 1985 | 51.6 mm (2.0 in) |
| 1986 | 35.6 mm (1.4 in) |
| 1987 | 77.5 mm (3.1 in) |
| 1988 | 53.1 mm (2.1 in) |
| 1989 | 27.9 mm (1.1 in) |
| 1990 | 34.5 mm (1.4 in) |
| 1991 | 57.2 mm (2.3 in) |
| 1992 | 60.2 mm (2.4 in) |
| 1993 | 73.9 mm (2.9 in) |
| 1994 | 38.6 mm (1.5 in) |
| 1995 | 52.6 mm (2.1 in) |
| 1996 | 39.4 mm (1.6 in) |
| 1997 | 61.7 mm (2.4 in) |
| 1998 | 47.0 mm (1.9 in) |
| 1999 | 41.9 mm (1.6 in) |
| 2000 | 32.3 mm (1.3 in) |
| 2001 | 30.7 mm (1.2 in) |
| 2002 | 40.1 mm (1.6 in) |
| 2003 | 55.9 mm (2.2 in) |
| 2004 | 51.1 mm (2.0 in) |
| 2005 | 40.4 mm (1.6 in) |
| 2006 | 36.3 mm (1.4 in) |
| 2007 | 43.9 mm (1.7 in) |
| 2008 | 42.7 mm (1.7 in) |
| 2009 | 65.3 mm (2.6 in) |
| 2010 | 62.0 mm (2.4 in) |
| 2011 | 64.0 mm (2.5 in) |
| 2012 | 31.8 mm (1.3 in) |
| 2013 | 38.1 mm (1.5 in) |
| 2014 | 46.7 mm (1.8 in) |
| 2015 | 45.7 mm (1.8 in) |
| 2016 | 41.9 mm (1.6 in) |
| 2017 | 43.9 mm (1.7 in) |
| 2018 | 38.1 mm (1.5 in) |
| 2019 | 80.0 mm (3.1 in) |
| 2020 | 40.6 mm (1.6 in) |
| 2021 | 45.7 mm (1.8 in) |
| 2022 | 35.6 mm (1.4 in) |
| 2023 | 100.6 mm (4.0 in) |
| 2024 | 38.1 mm (1.5 in) |
| 2025 | 48.3 mm (1.9 in) |
| 2026 | 35.6 mm (1.4 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1984 | 66.2 mm (2.6 in) |
| 1985 | 65.5 mm (2.6 in) |
| 1986 | 79.6 mm (3.1 in) |
| 1987 | 89.2 mm (3.5 in) |
| 1988 | 68.9 mm (2.7 in) |
| 1989 | 40.7 mm (1.6 in) |
| 1990 | 71.4 mm (2.8 in) |
| 1991 | 121.7 mm (4.8 in) |
| 1992 | 90.4 mm (3.6 in) |
| 1993 | 103.7 mm (4.1 in) |
| 1994 | 60.0 mm (2.4 in) |
| 1995 | 89.5 mm (3.5 in) |
| 1996 | 81.8 mm (3.2 in) |
| 1997 | 113.3 mm (4.5 in) |
| 1998 | 58.2 mm (2.3 in) |
| 1999 | 69.0 mm (2.7 in) |
| 2000 | 52.0 mm (2.0 in) |
| 2001 | 39.1 mm (1.5 in) |
| 2002 | 88.3 mm (3.5 in) |
| 2003 | 61.8 mm (2.4 in) |
| 2004 | 86.3 mm (3.4 in) |
| 2005 | 87.1 mm (3.4 in) |
| 2006 | 46.2 mm (1.8 in) |
| 2007 | 44.4 mm (1.7 in) |
| 2008 | 87.9 mm (3.5 in) |
| 2009 | 65.3 mm (2.6 in) |
| 2010 | 95.2 mm (3.7 in) |
| 2011 | 64.0 mm (2.5 in) |
| 2012 | 91.7 mm (3.6 in) |
| 2013 | 29.5 mm (1.2 in) |
| 2014 | 83.5 mm (3.3 in) |
| 2015 | 61.0 mm (2.4 in) |
| 2016 | 53.4 mm (2.1 in) |
| 2017 | 69.4 mm (2.7 in) |
| 2018 | 80.5 mm (3.2 in) |
| 2019 | 89.4 mm (3.5 in) |
| 2020 | 25.6 mm (1.0 in) |
| 2021 | 29.8 mm (1.2 in) |
| 2022 | 48.3 mm (1.9 in) |
| 2023 | 178.0 mm (7.0 in) |
| 2024 | 45.7 mm (1.8 in) |
| 2025 | 101.6 mm (4.0 in) |
| 2026 | 55.9 mm (2.2 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1984 | 31 days |
| 1985 | 21 days |
| 1986 | 34 days |
| 1987 | 55 days |
| 1988 | 43 days |
| 1989 | 63 days |
| 1990 | 20 days |
| 1991 | 63 days |
| 1992 | 53 days |
| 1993 | 56 days |
| 1994 | 26 days |
| 1995 | 32 days |
| 1996 | 82 days |
| 1997 | 37 days |
| 1998 | 35 days |
| 1999 | 98 days |
| 2000 | 76 days |
| 2001 | 34 days |
| 2002 | 93 days |
| 2003 | 41 days |
| 2004 | 55 days |
| 2005 | 34 days |
| 2006 | 33 days |
| 2007 | 54 days |
| 2008 | 77 days |
| 2009 | 36 days |
| 2010 | 78 days |
| 2011 | 50 days |
| 2012 | 36 days |
| 2013 | 27 days |
| 2014 | 32 days |
| 2015 | 51 days |
| 2016 | 30 days |
| 2017 | 49 days |
| 2018 | 44 days |
| 2019 | 54 days |
| 2020 | 68 days |
| 2021 | 36 days |
| 2022 | 116 days |
| 2023 | 68 days |
| 2024 | 57 days |
| 2025 | 30 days |
| 2026 | 30 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
32 years with a frostAcross 32 years with a frost, the median last spring frost at Flagstaff 4 SW falls on 22 June and the median first autumn frost on 3 September, which leaves a median of 70 days between them.
Fitted over all years, the growing season changes by +19.6 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1989 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 22 June | n/a | 22 June | n/a | -1.9 days per decade |
| First autumn frost | 3 September | n/a | 3 September | n/a | +17.7 days per decade |
| Growing days | 70 days | n/a | 70 days | n/a | +19.6 days per decade |
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
34 years, 1985 to 2025A day with at least 45.4 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 106.1 mm (4.2 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 45.4 mm (1.8 in) | |
| 5 years | 58.7 mm (2.3 in) | |
| 10 years | 68.6 mm (2.7 in) | |
| 25 years | 82.5 mm (3.2 in) | |
| 50 years | 93.8 mm (3.7 in) | Longer than the 34 years of record |
| 100 years | 106.1 mm (4.2 in) | Longer than the 34 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, 34 years of values from 1985 to 2025.
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: 100.6 mm (4.0 in) in 2023; 77.5 mm (3.1 in) in 1987; 73.9 mm (2.9 in) in 1993.
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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 (2026-10-14).