Union Pass Arizona Weather Records (USR0000AUNI)
Record envelope, standing records and threshold days for Union Pass Arizona (USR0000AUNI), Arizona, United States, with 30 years of record.
Key Facts for Union Pass Arizona
- Union Pass Arizona (USR0000AUNI) is a weather station in Arizona, United States at 35.22 latitude and -114.37 longitude, 1,073 m (3,520 ft) above sea level.
- The station reports from 1994 to 2023, 30 years of record.
- 1,464 records set at Union Pass Arizona still stand.
- Records are tracked for tmax, tmin: an element needs 30 years of data to be eligible.
- Union Pass Arizona set a daily record high minimum temperature of 24.4 C (75.9 F) on 9 October 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, 35.22 latitude, -114.37 longitude.
- Elevation: 1,073 m (3,520 ft).
- Period of record: 1994 to 2023, 30 years.
- Eligible elements: tmax, tmin.
Daily Record Envelope and 2026
31 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 25.0 C (77.0 F) | -7.2 C (19.0 F) | 21.7 C (71.1 F) | 0.0 C (32.0 F) |
| Feb | 27.2 C (81.0 F) | -6.7 C (19.9 F) | 27.2 C (81.0 F) | 0.6 C (33.1 F) |
| Mar | 35.0 C (95.0 F) | -1.1 C (30.0 F) | 35.0 C (95.0 F) | 6.1 C (43.0 F) |
| Apr | 33.9 C (93.0 F) | -1.1 C (30.0 F) | 28.9 C (84.0 F) | 6.7 C (44.1 F) |
| May | 38.3 C (100.9 F) | 4.4 C (39.9 F) | 35.6 C (96.1 F) | 10.0 C (50.0 F) |
| Jun | 42.8 C (109.0 F) | 5.6 C (42.1 F) | 37.8 C (100.0 F) | 20.0 C (68.0 F) |
| Jul | 43.9 C (111.0 F) | 16.7 C (62.1 F) | 40.6 C (105.1 F) | 20.0 C (68.0 F) |
| Aug | 41.7 C (107.1 F) | 17.2 C (63.0 F) | 41.1 C (106.0 F) | 19.4 C (66.9 F) |
| Sep | 41.1 C (106.0 F) | 10.0 C (50.0 F) | 38.3 C (100.9 F) | 12.8 C (55.0 F) |
| Oct | 38.5 C (101.3 F) | 0.0 C (32.0 F) | 34.4 C (93.9 F) | 15.0 C (59.0 F) |
| Nov | 30.6 C (87.1 F) | -3.3 C (26.1 F) | n/a | n/a |
| Dec | 25.0 C (77.0 F) | -5.0 C (23.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1994 | 33 |
| 1995 | 49 |
| 1996 | 55 |
| 1997 | 33 |
| 1998 | 47 |
| 1999 | 65 |
| 2000 | 60 |
| 2001 | 50 |
| 2002 | 37 |
| 2003 | 69 |
| 2004 | 45 |
| 2005 | 31 |
| 2006 | 33 |
| 2007 | 49 |
| 2008 | 41 |
| 2009 | 38 |
| 2010 | 22 |
| 2011 | 63 |
| 2012 | 43 |
| 2013 | 53 |
| 2014 | 38 |
| 2015 | 31 |
| 2016 | 28 |
| 2017 | 47 |
| 2018 | 22 |
| 2019 | 37 |
| 2020 | 66 |
| 2021 | 48 |
| 2022 | 25 |
| 2023 | 44 |
| 2024 | 59 |
| 2025 | 51 |
| 2026 | 52 |
Period of Record Coverage
1994 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1994 | 222 | 61% | No |
| 1995 | 349 | 96% | Yes |
| 1996 | 330 | 90% | Yes |
| 1997 | 363 | 99% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 364 | 100% | Yes |
| 2000 | 366 | 100% | Yes |
| 2001 | 365 | 100% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 363 | 99% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 364 | 100% | Yes |
| 2011 | 362 | 99% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 363 | 99% | Yes |
| 2015 | 364 | 100% | Yes |
| 2016 | 364 | 99% | Yes |
| 2017 | 364 | 100% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 364 | 100% | Yes |
| 2020 | 354 | 97% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 364 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 365 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 284 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 9 October 2026 | Union Pass Arizona, US | daily high min (Provisional) | 24.4 C (75.9 F) | 0.1 C (0.2 F) | 1 year | 3 of 100 (Routine) |
| 29 September 2026 | Union Pass Arizona, US | monthly low max (Tie, Provisional) | 20.0 C (68.0 F) | tie | 9 years | 3 of 100 (Routine) |
| 29 September 2026 | Union Pass Arizona, US | daily low min (Tie, Provisional) | 13.3 C (55.9 F) | tie | 7 years | 1 of 100 (Routine) |
| 28 September 2026 | Union Pass Arizona, US | daily low min (Provisional) | 12.8 C (55.0 F) | 1.1 C (2.0 F) | 12 years | 9 of 100 (Routine) |
| 11 September 2026 | Union Pass Arizona, US | daily high min (Provisional) | 27.2 C (81.0 F) | 1.1 C (2.0 F) | 8 years | 8 of 100 (Routine) |
| 10 September 2026 | Union Pass Arizona, US | daily high max (Provisional) | 38.3 C (100.9 F) | 2.2 C (4.0 F) | 19 years | 14 of 100 (Routine) |
| 10 September 2026 | Union Pass Arizona, US | daily high min (Provisional) | 30.0 C (86.0 F) | 2.2 C (4.0 F) | 4 years | 10 of 100 (Routine) |
| 9 September 2026 | Union Pass Arizona, US | daily high min (Provisional) | 29.4 C (84.9 F) | 1.6 C (2.9 F) | 4 years | 8 of 100 (Routine) |
| 6 September 2026 | Union Pass Arizona, US | daily low max (Provisional) | 26.1 C (79.0 F) | 2.8 C (5.0 F) | 24 years | 17 of 100 (Routine) |
| 27 August 2026 | Union Pass Arizona, US | daily high min (Tie, Provisional) | 30.0 C (86.0 F) | tie | 5 years | 1 of 100 (Routine) |
| 26 August 2026 | Union Pass Arizona, US | daily high min (Provisional) | 29.4 C (84.9 F) | 0.5 C (0.9 F) | 5 years | 5 of 100 (Routine) |
| 26 August 2026 | Union Pass Arizona, US | daily high max (Tie, Provisional) | 40.0 C (104.0 F) | tie | 24 years | 2 of 100 (Routine) |
| 23 August 2026 | Union Pass Arizona, US | daily high min (Provisional) | 29.4 C (84.9 F) | 1.6 C (2.9 F) | 28 years | 17 of 100 (Routine) |
| 22 August 2026 | Union Pass Arizona, US | daily high max (Provisional) | 38.9 C (102.0 F) | 0.6 C (1.1 F) | 28 years | 13 of 100 (Routine) |
| 19 August 2026 | Union Pass Arizona, US | daily high min (Provisional) | 29.4 C (84.9 F) | 1.1 C (2.0 F) | 5 years | 8 of 100 (Routine) |
| 18 August 2026 | Union Pass Arizona, US | daily high min (Tie) | 28.9 C (84.0 F) | tie | 5 years | 1 of 100 (Routine) |
| 13 August 2026 | Union Pass Arizona, US | daily low max | 28.9 C (84.0 F) | 0.5 C (0.9 F) | 12 years | 7 of 100 (Routine) |
| 13 August 2026 | Union Pass Arizona, US | daily low min (Tie) | 19.4 C (66.9 F) | tie | 12 years | 1 of 100 (Routine) |
| 12 August 2026 | Union Pass Arizona, US | daily low max | 31.1 C (88.0 F) | 1.7 C (3.1 F) | 27 years | 17 of 100 (Routine) |
| 9 August 2026 | Union Pass Arizona, US | daily high min | 29.4 C (84.9 F) | 1.1 C (2.0 F) | 31 years | 16 of 100 (Routine) |
Climate Trend
28 complete years, 1997 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1997 | 19.3 C | -0.30 C |
| 1998 | 17.9 C | -1.67 C |
| 1999 | 19.4 C | -0.18 C |
| 2000 | 19.8 C | +0.22 C |
| 2001 | 19.5 C | -0.04 C |
| 2002 | 19.6 C | +0.08 C |
| 2003 | 19.7 C | +0.18 C |
| 2004 | 19.0 C | -0.57 C |
| 2005 | 19.0 C | -0.54 C |
| 2006 | 19.6 C | +0.02 C |
| 2007 | 19.8 C | +0.28 C |
| 2008 | 19.3 C | -0.24 C |
| 2009 | 19.5 C | -0.04 C |
| 2010 | 18.6 C | -0.95 C |
| 2011 | 18.8 C | -0.75 C |
| 2012 | 20.3 C | +0.76 C |
| 2013 | 19.3 C | -0.27 C |
| 2014 | 20.3 C | +0.73 C |
| 2015 | 19.9 C | +0.34 C |
| 2016 | 20.0 C | +0.45 C |
| 2017 | 20.4 C | +0.89 C |
| 2018 | 20.2 C | +0.61 C |
| 2019 | 18.6 C | -0.96 C |
| 2021 | 20.2 C | +0.63 C |
| 2022 | 19.7 C | +0.17 C |
| 2023 | 19.1 C | -0.49 C |
| 2024 | 20.5 C | +0.90 C |
| 2025 | 20.4 C | +0.82 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
1994 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 43.9 C (111.0 F) | 2005 | 41.7 C (107.1 F) | 33 |
| Coldest night (TNn) | -7.2 C (19.0 F) | 2013 | -2.2 C (28.0 F) | 33 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1994 | 41.7 C (107.1 F) |
| 1995 | 42.8 C (109.0 F) |
| 1996 | 41.1 C (106.0 F) |
| 1997 | 40.0 C (104.0 F) |
| 1998 | 42.2 C (108.0 F) |
| 1999 | 38.3 C (100.9 F) |
| 2000 | 40.6 C (105.1 F) |
| 2001 | 41.1 C (106.0 F) |
| 2002 | 40.6 C (105.1 F) |
| 2003 | 42.8 C (109.0 F) |
| 2004 | 41.1 C (106.0 F) |
| 2005 | 43.9 C (111.0 F) |
| 2006 | 41.7 C (107.1 F) |
| 2007 | 42.8 C (109.0 F) |
| 2008 | 41.1 C (106.0 F) |
| 2009 | 42.2 C (108.0 F) |
| 2010 | 41.7 C (107.1 F) |
| 2011 | 41.1 C (106.0 F) |
| 2012 | 42.2 C (108.0 F) |
| 2013 | 42.8 C (109.0 F) |
| 2014 | 38.9 C (102.0 F) |
| 2015 | 38.9 C (102.0 F) |
| 2016 | 42.2 C (108.0 F) |
| 2017 | 42.2 C (108.0 F) |
| 2018 | 41.1 C (106.0 F) |
| 2019 | 39.4 C (102.9 F) |
| 2020 | 41.7 C (107.1 F) |
| 2021 | 42.8 C (109.0 F) |
| 2022 | 40.0 C (104.0 F) |
| 2023 | 42.2 C (108.0 F) |
| 2024 | 42.9 C (109.2 F) |
| 2025 | 39.4 C (102.9 F) |
| 2026 | 41.1 C (106.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1994 | -3.3 C (26.1 F) |
| 1995 | 0.0 C (32.0 F) |
| 1996 | -2.8 C (27.0 F) |
| 1997 | -2.2 C (28.0 F) |
| 1998 | -2.8 C (27.0 F) |
| 1999 | -1.7 C (28.9 F) |
| 2000 | 1.1 C (34.0 F) |
| 2001 | -1.7 C (28.9 F) |
| 2002 | -3.3 C (26.1 F) |
| 2003 | -0.6 C (30.9 F) |
| 2004 | -1.1 C (30.0 F) |
| 2005 | -0.6 C (30.9 F) |
| 2006 | -1.1 C (30.0 F) |
| 2007 | -6.7 C (19.9 F) |
| 2008 | -3.3 C (26.1 F) |
| 2009 | -2.2 C (28.0 F) |
| 2010 | -4.4 C (24.1 F) |
| 2011 | -6.7 C (19.9 F) |
| 2012 | -0.6 C (30.9 F) |
| 2013 | -7.2 C (19.0 F) |
| 2014 | -5.0 C (23.0 F) |
| 2015 | -3.3 C (26.1 F) |
| 2016 | -1.7 C (28.9 F) |
| 2017 | -1.7 C (28.9 F) |
| 2018 | -1.1 C (30.0 F) |
| 2019 | -3.3 C (26.1 F) |
| 2020 | -2.8 C (27.0 F) |
| 2021 | -2.2 C (28.0 F) |
| 2022 | -2.8 C (27.0 F) |
| 2023 | -1.7 C (28.9 F) |
| 2024 | -0.8 C (30.6 F) |
| 2025 | -0.3 C (31.5 F) |
| 2026 | 0.0 C (32.0 F) |
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
20 years with a frostAcross 20 years with a frost, the median last spring frost at Union Pass Arizona falls on 22 February and the median first autumn frost on 11 December, which leaves a median of 293 days between them.
| Measure | Median, all years | Earliest period | Recent period (1997 to 2022) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 22 February | n/a | 22 February | n/a | n/a |
| First autumn frost | 11 December | n/a | 11 December | n/a | n/a |
| Growing days | 293 days | n/a | 293 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.
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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-17).