| Quick facts | Answer |
|---|---|
| Station | Phoenix Sky Harbor Airport (closest NOAA station to Tempe) |
| Period | 2000 - 2026-10-16 |
| Average 110°F days/year | 27.6 |
| Most in a year | 70 days (2024) |
| 2025 | 37 days |
| 2026 so far (through 2026-10-16) | 39 days |
| Peak month | Jul |
110°F days in Tempe, year by year
| Year | Days ≥ 110°F | Hottest day | Note |
|---|---|---|---|
| 2026 | 39 | 117°F | partial (289 days of data) |
| 2025 | 37 | 118°F | |
| 2024 | 70 | 118°F | |
| 2023 | 55 | 119°F | |
| 2022 | 22 | 115°F | |
| 2021 | 22 | 118°F | |
| 2020 | 53 | 118°F | |
| 2019 | 29 | 115°F | |
| 2018 | 22 | 116°F | |
| 2017 | 25 | 119°F | |
| 2016 | 30 | 118°F | |
| 2015 | 20 | 117°F | |
| 2014 | 10 | 116°F | |
| 2013 | 25 | 119°F | |
| 2012 | 21 | 116°F | |
| 2011 | 33 | 118°F | |
| 2010 | 23 | 114°F | |
| 2009 | 27 | 115°F | |
| 2008 | 22 | 115°F | |
| 2007 | 32 | 116°F | |
| 2006 | 19 | 118°F | |
| 2005 | 24 | 116°F | |
| 2004 | 12 | 112°F | |
| 2003 | 26 | 117°F | |
| 2002 | 28 | 113°F | |
| 2001 | 16 | 116°F | |
| 2000 | 15 | 113°F |
Which months bring 110°F days
Average number of 110°F days per month, 2000-2025:
| Month | Avg days |
|---|---|
| May | 0.2 |
| Jun | 7.2 |
| Jul | 11.8 |
| Aug | 8.3 |
| Sep | 1.5 |
| Oct | 0.2 |
What it means for pool service in Tempe
Long runs of extreme heat push pool water temperature and chlorine demand up, which is when algae and pump strain show up.
How we counted
We downloaded NOAA's daily record for station USW00023183 and counted every day since 2000 whose official high (TMAX) reached 110°F (NOAA stores tenths of a degree Celsius; we converted). Years with fewer than 330 days of data are marked partial and left out of the average.
Use this data
Reporters, bloggers and neighborhood groups are welcome to use these numbers. Please cite NOAA and link to this page. We refresh it from NOAA's files regularly.
