Upper Santan has mild winters and scorching summers, with very little rain
A typical July afternoon reaches 106°, a January night drops to 39°, and snow is almost unheard of.
A year in Upper Santan at a glance
Each month’s typical high and low, and what it brings.
What stands out about Upper Santan’s climate
Read from where Upper Santan sits among Arizona’s towns. The page puts what stands out first.
About 315 frost-free days a year
In half of years the last 32° night comes by February 1 and the first by December 11.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
Living with Upper Santan’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
315 frost-free days. The last frost comes by Feb 1 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Dec 11.
About 0.0" in a normal winter.
Months averaging under 55° run from December through January. Heating is 27% of the year’s heating-and-cooling load.
About 165 days a year reach 90°, and July afternoons average 106°.
The nicest months are February, March and November. 15 miles of trails are waiting.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →Rain and snow in Upper Santan
August is the wettest month and June the driest. Rain or snow falls on about 37 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
No measurable snow in a normal year.
What a year in Upper Santan feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Warmer than it used to be
The last 30 years in Upper Santan averaged 2.0° warmer than the 1900s. The biggest change is in March (+2.7°).
A bigger shift than in 94% of U.S. towns.
Change by month
How Upper Santan compares
Against every U.S. town on TownTapestry, each counted once, with its place in Arizona.
Upper Santan 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° | 39° | 0.9" | 0 | 4 | 0 | 50° – 58° |
| February | 71° | 42° | 1.0" | 0 | 4 | 0 | 51° – 62° |
| March | 78° | 47° | 0.9" | 0 | 3 | 0 | 55° – 69° |
| April | 85° | 53° | 0.3" | 0 | 1 | 0 | 63° – 74° |
| May | 94° | 61° | 0.2" | 0 | 1 | 0 | 72° – 83° |
| June | 104° | 70° | 0.0" | 0 | 1 | 0 | 82° – 91° |
| July | 106° | 78° | 0.9" | 0 | 5 | 0 | 89° – 95° |
| August | 104° | 77° | 1.2" | 0 | 5 | 0 | 87° – 95° |
| September | 99° | 71° | 0.7" | 0 | 3 | 0 | 81° – 87° |
| October | 89° | 58° | 0.4" | 0 | 2 | 0 | 70° – 78° |
| November | 76° | 46° | 0.6" | 0 | 2 | 0 | 53° – 67° |
| December | 66° | 39° | 0.9" | 0 | 4 | 0 | 49° – 56° |
| Year | 87° | 57° | 7.8" | 0.0" | 37 | 0 |
Heating and cooling a home in Upper Santan
27% of the work is heating, so air conditioning is the bigger bill.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. Source: NOAA station normals.
How much a month can swing
A normal is an average. November swings the most: from 1991 to 2020 its average ranged from 53° to 67°. July is the most reliable, staying within 6°.
Common questions about Upper Santan’s climate
What is the coldest month in Upper Santan?
December, with a typical high of 66° and a low of 39°.
What is the hottest month in Upper Santan?
July, with a typical high of 106° and a low of 78°. About 165 days a year reach 90°.
How much snow does Upper Santan get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Upper Santan?
In half of years the first 32° night comes by December 11, and the last spring frost by February 1.
What is the rainiest month in Upper Santan?
August, with 1.2 inches of rain and melted snow. The year totals 8 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Upper Santan.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Upper Santan itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Casa Grande Nm, AZ (15 mi, snow) and Chandler Heights, AZ (7 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Today’s forecast: National Weather Service.