Photo: DrStarbuck from Madison, WI, USA · CC BY 2.0Casas Adobes reaches 100° on about 73 days a year, more than all but 104 U.S. towns
Midwinter brings lows of about 38°. Winter and summer sit 64° apart. It is a dry place: less rain and snow fall here than on 96% of U.S. towns. Comfortable outdoor weather lasts from February to April and November, with highs of 70–83°.
A year in Casas Adobes at a glance
Each month’s typical high and low, and what it brings.
What stands out about Casas Adobes’ climate
Compared with towns across the U.S., with Casas Adobes’ place in Arizona beside it.
What a year in Casas Adobes feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 279 frost-free days a year
In half of years the last 32° night comes by February 26 and the first by December 4. Frost and day counts come from NOAA’s station at Tohono Chul, AZ, 1.8 miles from the city’s center point, 130 ft higher.
The 2023 USDA map puts Casas Adobes’ center in zone 9a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 24°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 11 inches of rain a year
August is the wettest month and May the driest. Rain falls on about 48 days a year. Snow is rare: about 0.0" in a normal year at Tucson U Of A #1, AZ, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Casas Adobes
33% of the work is heating, so air conditioning is the bigger bill. Months averaging under 55°: December and January.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Tohono Chul, AZ.
Living with Casas Adobes’ climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
279 frost-free days in zone 9a. The last frost comes by Feb 26 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 4.
Months with highs of 62–84° and lows of 40° or more: February, March, April and November. 15 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Casas Adobes from natural hazards, river flooding is the largest share (72%); heat waves, cold waves, winter storms and ice storms together are 25%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Casas Adobes and its neighbors
Every town next door is within a degree of Casas Adobes in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Casas Adobes’, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Casas Adobes, AZ | 38° | 101° | 11" | 0.0" |
| Hillcrest, CA | 40° | 100° | 10" | 0.1" |
| Summerlin South, NV | 35° | 102° | 5" | 0.2" |
| Washington, UT | 32° | 102° | 11" | 1.2" |
| Eagle Pass, TX | 41° | 98° | 19" | 0.0" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Casas Adobes averaged 1.4° warmer than the 1900s. The biggest change is in March (+2.4°).
A smaller shift than in 50% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Casas Adobes compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Casas Adobes’ place among Arizona’s.
Casas Adobes weather by month
Highs, lows and precipitation from NOAA’s grid at Casas Adobes’ center; snow, wet days and snow on the ground from Tucson U Of A #1, AZ. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 67° | 38° | 1.1" | 0.0" | 4 | 0 | 48° – 58° |
| February | 70° | 41° | 1.1" | 0.0" | 5 | 0 | 50° – 61° |
| March | 76° | 45° | 0.8" | 0.0" | 4 | 0 | 54° – 66° |
| April | 83° | 51° | 0.3" | 0.0" | 2 | 0 | 61° – 72° |
| May | 92° | 59° | 0.2" | 0.0" | 2 | 0 | 70° – 80° |
| June | 102° | 69° | 0.2" | 0.0" | 2 | 0 | 80° – 88° |
| July | 101° | 75° | 1.8" | 0.0" | 7 | 0 | 85° – 90° |
| August | 100° | 73° | 2.1" | 0.0" | 9 | 0 | 84° – 92° |
| September | 96° | 68° | 1.2" | 0.0" | 4 | 0 | 77° – 85° |
| October | 87° | 56° | 0.6" | 0.0" | 3 | 0 | 68° – 76° |
| November | 75° | 45° | 0.7" | 0.0" | 3 | 0 | 52° – 67° |
| December | 66° | 38° | 1.2" | 0.0" | 5 | 0 | 47° – 56° |
| Year | 85° | 55° | 11.3" | 0.0" | 48 | 0 |
How much a month can swing
A normal is an average. November swings the most: from 1991 to 2020 its average ranged from 52° to 67°. July is the most reliable, staying within 6°.
Where Casas Adobes’ numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Casas Adobes’ center.
- Snow: Tucson U Of A #1, AZ.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Tohono Chul, AZ, 1.8 miles from the city’s center point, 130 ft higher; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Casas Adobes’ climate
What is the weather like in Casas Adobes?
A typical July afternoon reaches 101°, a January night drops to 38°, and snow is almost unheard of. Milder January nights than 86% of U.S. towns; hotter July afternoons than all but 108 U.S. towns.
How cold does it get in Casas Adobes in winter?
December nights average 38°. About 20 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 47°.
How much snow does Casas Adobes get?
About 0.0 inches in a normal winter at Tucson U Of A #1, AZ, so most winters see none.
How hot does it get in Casas Adobes?
July, with a typical high of 101° and a low of 75°. About 159 days a year reach 90° and 73 reach 100° (Tohono Chul, AZ).
When is the first and last frost in Casas Adobes?
In half of years the last spring frost (32°) comes by February 26 and the first fall frost by December 4, about 279 frost-free days, at Tohono Chul, AZ.
What growing zone is Casas Adobes in?
Zone 9a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 24°.
What is the best time of year to visit Casas Adobes?
By one simple rule (highs of 62–84° and lows of 40° or more), February, March, April and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Casas Adobes getting warmer?
Yes: 1991–2020 averaged 1.4° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 50% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Casas Adobes.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.