Arizona roof facts
Phoenix 110-degree days by year, 2016 to 2025
The number of days Phoenix Sky Harbor reached 110 degrees or hotter in each of the last ten years, from National Weather Service climate summaries.
Phoenix Sky Harbor hit 110 degrees or hotter on 70 days in 2024, the most on record, and on 55 days in 2023. The 1991 to 2020 normal is about 21 days a year. Every year from 2016 to 2025 had at least 22 such days. Source: National Weather Service Phoenix yearly climate summaries, compiled by 10X Roofing Advantage.
TL;DR
Roof materials are rated for heat, but not for this much of it, this often. The count of 110-degree days is the clearest number for how hard a Phoenix roof works.
- 2024: 70 days at 110 or hotter, the record. 2023: 55 days. 2020: 53 days
- Normal (1991 to 2020): about 21 days a year
- 2023 also set the record streak: 30 straight days at 110 or hotter in July
- 2025: 37 days, still well above normal
- Roof surfaces run far hotter than the air. Heat dries out underlayment, sealant and foam coating years early
Days at or above 110 degrees, Phoenix Sky Harbor
| Year | Days at 110 F or hotter |
|---|---|
| 2016 | 30 |
| 2017 | 25 |
| 2018 | 22 |
| 2019 | 29 |
| 2020 | 53 |
| 2021 | 22 |
| 2022 | 22 |
| 2023 | 55 |
| 2024 | 70 |
| 2025 | 37 |
| 2026 (preliminary) | 39 |
Counts are from the NWS Phoenix yearly climate summary for each year (line DAYS MAX >= 110). 2016 to 2018 counts were computed from NOAA daily station data and match the NWS method.
About this dataset
The table above is a dataset. These fields describe it.
- Dataset
- Phoenix Sky Harbor days with a high of 110 F or hotter, 2016 to 2025
- What it covers
- Annual count of calendar days with a maximum temperature of at least 110 degrees Fahrenheit at Phoenix Sky Harbor Airport, from NWS Phoenix yearly climate summaries and NOAA GHCN-Daily station records.
- Source
- National Weather Service Phoenix; NOAA National Centers for Environmental Information
- Period
- 2016-01-01/2025-12-31
- Area
- Phoenix Sky Harbor Airport, Phoenix, Arizona
- Updated
- November 5, 2026
- Source link
- https://www.weather.gov/psr/yearinreview2024
What this heat does to a roof
Tile and shingles take the sun. The felt underlayment under the tile, the pipe boots, and the sealant at flashing are what dry out and crack.
On a foam roof, the top coating is the only thing protecting the foam. More hot days means the coating chalks sooner.
A roof from 2004 has now lived through 2020, 2023 and 2024, the three years with the most 110-degree days on record. That is why a 20-year-old West Valley roof often needs new underlayment while its tile still looks new.
How to read the numbers
Sky Harbor is the official Phoenix station. Glendale, Peoria and Surprise run within a degree or two of it on most days.
The 2026 row is preliminary from NOAA daily data. NWS Phoenix publishes its yearly review in early January.
Sources
- NWS Phoenix, 2025 Weather Review (37 days): https://www.weather.gov/psr/yearinreview2025
- NWS Phoenix, 2024 Climate Year in Review (70 days): https://www.weather.gov/psr/yearinreview2024
- NWS Phoenix, 2023 Climate Year in Review (55 days): https://www.weather.gov/psr/yearinreview2023
- NWS Phoenix, 2022 Climate Year in Review (22 days): https://www.weather.gov/psr/yearinreview2022
- NWS Phoenix, 2021 Climate Year in Review (22 days): https://www.weather.gov/psr/yearinreview2021
- NWS Phoenix, 2020 Climate Year in Review (53 days): https://www.weather.gov/psr/yearinreview2020
- NWS Phoenix, 2019 Climate Year in Review (29 days): https://www.weather.gov/psr/Year_in_Review_2019
- NWS Phoenix, 2023 Monsoon Season Review (30 consecutive days at 110 or hotter): https://www.weather.gov/psr/2023MonsoonSeasonReview
- City of Phoenix Weekly Heat Response Reports 2023 (normal 110-degree days, 1991 to 2020 basis): https://www.phoenix.gov/content/dam/phoenix/heatsite/documents/heat-response-weekly-reports/2023/2023%20Weekly%20Heat%20Reports.pdf
- NOAA NCEI GHCN-Daily, station USW00023183 (2016 to 2018 counts and 2026 preliminary): https://www.ncei.noaa.gov/pub/data/ghcn/daily/by_station/USW00023183.csv.gz
- Accessed November 5, 2026.
Compiled by the 10X Roofing Advantage team, Glendale, AZ, from the public sources listed below. Reviewed by {{REVIEWER}}. Published {{PUBLISHED}}. Last updated {{UPDATED}}. Data as of November 5, 2026. 10X Roofing Advantage is licensed under Arizona ROC #355299 and has roofed in Phoenix for 20 years.