Stewart Mountain Dam · Photo: US Bureau of Reclamation · Public domainFountain Hills reaches 100° on about 102 days a year, more than all but 67 U.S. towns
January mornings start at about 43°. Temperatures cover 62° across the year, low to high. Precipitation is light here, less than falls on 97% of U.S. towns. Garden chairs stay out from November to April, the months with highs of 66–83°.
A year in Fountain Hills at a glance
Each month’s typical high and low, and what it brings.
What stands out about Fountain Hills’ climate
Compared with towns across the U.S., with Fountain Hills’ place in Arizona beside it.
What a year in Fountain Hills feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 102 days a year reach 100°
And 167 days reach 90°. Frost and day counts come from NOAA’s station at Fountain Hills, AZ, 1.5 miles from the town’s center, 190 ft lower.
The 2023 USDA map puts Fountain Hills’ center in zone 9b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 30°. 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 10 inches of rain a year
February is the wettest month and June the driest. Rain falls on about 32 days a year. Snow is rare: about 0.0" in a normal year at Fountain Hills, AZ, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Fountain Hills
24% 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 Fountain Hills, AZ.
Living with Fountain Hills’ climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 9b. Frost comes about 6 winters in 10, so the growing year is set by heat, not cold: 102 days at 100° make midsummer the hard season for gardens.
Months with highs of 62–84° and lows of 40° or more: January, February, March, April, November and December. 48 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Fountain Hills from natural hazards, river flooding is the largest share (52%); heat waves, cold waves, winter storms and ice storms together are 36%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Fountain Hills and its neighbors
Every town next door is within a degree of Fountain Hills in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Fountain Hills’, 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 |
|---|---|---|---|---|
| Fountain Hills, AZ | 43° | 104° | 10" | 0.0" |
| Desert Hot Springs, CA | 42° | 105° | 7" | 0.8" |
| Henderson, NV | 40° | 105° | 5" | 0.2" |
| St. George, UT | 33° | 103° | 8" | 1.2" |
| Laredo, TX | 45° | 99° | 20" | 0.1" |
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 Fountain Hills averaged 2.3° warmer than the 1900s. The biggest change is in January (+3.2°).
A bigger shift than in 98% 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 Fountain Hills compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Fountain Hills’ place among Arizona’s.
Fountain Hills weather by month
Highs, lows and precipitation from NOAA’s grid at Fountain Hills’ center; snow, wet days and snow on the ground from Fountain Hills, AZ. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 67° | 43° | 1.5" | 0.0" | 4 | 0 | 51° – 60° |
| February | 70° | 45° | 1.5" | 0.0" | 4 | 0 | 51° – 62° |
| March | 76° | 49° | 1.4" | 0.0" | 3 | 0 | 55° – 69° |
| April | 83° | 54° | 0.4" | 0.0" | 1 | 0 | 63° – 74° |
| May | 93° | 62° | 0.2" | 0.0" | 1 | 0 | 72° – 82° |
| June | 102° | 71° | 0.0" | 0.0" | 0 | 0 | 81° – 90° |
| July | 104° | 78° | 0.9" | 0.0" | 3 | 0 | 88° – 94° |
| August | 103° | 78° | 1.2" | 0.0" | 4 | 0 | 87° – 95° |
| September | 98° | 72° | 0.9" | 0.0" | 3 | 0 | 81° – 88° |
| October | 88° | 61° | 0.7" | 0.0" | 2 | 0 | 71° – 79° |
| November | 75° | 50° | 0.7" | 0.0" | 2 | 0 | 55° – 68° |
| December | 66° | 42° | 1.2" | 0.0" | 3 | 0 | 51° – 58° |
| Year | 85° | 59° | 10.4" | 0.0" | 32 | 0 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 55° to 69°. July is the most reliable, staying within 6°.
Where Fountain Hills’ 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 Fountain Hills’ center.
- Snow: Fountain Hills, AZ (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Fountain Hills, AZ, 1.5 miles from the town’s center, 190 ft lower; 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 Fountain Hills’ climate
What is the weather like in Fountain Hills?
A typical July afternoon reaches 104°, a January night drops to 43°, and snow is almost unheard of. Milder January nights than 92% of U.S. towns; hotter July afternoons than all but 79 U.S. towns.
How cold does it get in Fountain Hills in winter?
December nights average 42°. About 4 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 51°.
How much snow does Fountain Hills get?
About 0.0 inches in a normal winter at Fountain Hills, AZ, so most winters see none.
How hot does it get in Fountain Hills?
July, with a typical high of 104° and a low of 78°. About 167 days a year reach 90° and 102 reach 100° (Fountain Hills, AZ).
When is the first and last frost in Fountain Hills?
There is no reliable frost date: a 32° night comes in about 63% of winters at Fountain Hills, AZ, so most years bring a freeze but some pass without one.
What growing zone is Fountain Hills in?
Zone 9b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 30°.
What is the best time of year to visit Fountain Hills?
By one simple rule (highs of 62–84° and lows of 40° or more), January, February, March, April, November and December. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Fountain Hills getting warmer?
Yes: 1991–2020 averaged 2.3° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 98% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Fountain Hills.
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.