Summit, AZ climate
Summit has mild winters and hot summers, with very little rain. A typical July afternoon reaches 100°, a January night drops to 38°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decade14° cooler than normal today. The forecast high is 77°, and a typical Sep 30 in Summit peaks around 91°.Live forecast: National Weather Service · Normal: NOAA 1991–2020
What a year in Summit feels like
Winter
Spring
Summer
Fall
Summit weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 67° | 38° | 0.8" | 0 | 4 | 0 | 48° – 58° |
| February | 70° | 40° | 0.9" | 0.1" | 4 | 0 | 50° – 61° |
| March | 76° | 45° | 0.6" | 0 | 3 | 0 | 54° – 66° |
| April | 83° | 50° | 0.3" | 0 | 2 | 0 | 61° – 71° |
| May | 92° | 58° | 0.2" | 0 | 1 | 0 | 69° – 79° |
| June | 101° | 68° | 0.2" | 0 | 2 | 0 | 79° – 88° |
| July | 100° | 74° | 2.4" | 0 | 9 | 0 | 84° – 90° |
| August | 98° | 73° | 2.3" | 0 | 9 | 0 | 83° – 91° |
| September | 95° | 67° | 1.4" | 0 | 4 | 0 | 77° – 83° |
| October | 87° | 55° | 0.7" | 0 | 3 | 0 | 67° – 75° |
| November | 76° | 44° | 0.6" | 0 | 3 | 0 | 52° – 67° |
| December | 66° | 38° | 1.1" | 0 | 4 | 0 | 48° – 56° |
| Year | 84° | 54° | 11.5" | 0.1" | 47 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Summit
Summit gets 12 inches of rain and melted snow a year. July is the wettest month and May the driest. Rain or snow falls on about 47 days a year.
About 307 frost-free days a year
In half of years the last 32° night comes by February 5 and the first one by December 9. That leaves about 307 frost-free days for gardens, longer than 95% of U.S. towns.
Heating and cooling a home in Summit
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Summit, 28% of that work is heating and 72% is cooling, so air conditioning is the bigger bill.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Summit and its neighbors
Summit borders 1 town with climate data. January nights across them vary by 0.1°. Tucson has both the coldest January nights (38°) and the hottest July afternoons (100°). Summit’s January low is 38° and its July high 100°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Summit compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Summit averaged 1.4° warmer than the 1900s. The biggest change is in March (+2.3°). The shift is larger than in 63% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Summit’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. November swings the most: between 1991 and 2020 its average temperature ranged from 52° to 67°. July is the most reliable, staying within 6°.
Common questions about Summit’s climate
What is the coldest month in Summit?
December, with a typical high of 66° and a low of 38°.
What is the hottest month in Summit?
June, with a typical high of 101° and a low of 68°. About 158 days a year reach 90°.
How much snow does Summit get?
Almost none. A normal year brings 0.1 inches.
When is the first frost in Summit?
In half of years the first 32° night comes by December 9, and the last spring frost by February 5.
What is the rainiest month in Summit?
July, with 2.4 inches of rain and melted snow. The year totals 12 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Summit itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Tucson Intl Airport, AZ (5 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.