Will Pipes Freeze in Maricopa County, AZ? No Normal Risk Nights
Freeze nights in Maricopa County
A normal winter in Maricopa County, AZ never drops to 20°F, the point where bare pipes in unheated space start to freeze.
Risk level: No normal risk nights.
It depends where the pipe is
| Pipe | Freezes near | Nights a year |
|---|---|---|
| Outdoor spigot, open crawlspace | 32°F | 6 nights |
| Bare pipe in garage, attic or outside wall | 20°F | none |
| Insulated pipe in unheated space | 10°F | none |
| Inside the heated house | 0°F | none |
Month by month
Nights at or below 20°F in a normal year.
First 32°F night is usually around 12/24, last around 01/07.
How cold Maricopa County nights get
Average winter (Dec-Feb) low: 43°F; the coldest month, December, averages 42°F overnight. 3 months normally bring at least one night below 32°F (Jan, Nov, Dec).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 43°F | 45°F | 51°F | 56°F | 65°F | 74°F | 81°F | 80°F | 74°F | 61°F | 49°F | 42°F |
Maricopa County next to its neighbours
Yavapai County, AZ, 143 km north, gets 25 nights below 20°F to Maricopa County's none.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Maricopa County, AZ | - | 6 nights | none | 43°F |
| Pinal County, AZ | 116 km southeast | 22 nights | under 1 night | 39°F |
| Yavapai County, AZ | 143 km north | 123 nights | 25 nights | 25°F |
| Yuma County, AZ | 146 km southwest | 21 nights | under 1 night | 38°F |
| La Paz County, AZ | 149 km west | 14 nights | under 1 night | 41°F |
| Pima County, AZ | 151 km southeast | 36 nights | 2 nights | 36°F |
| Gila County, AZ | 164 km east | 24 nights | under 1 night | 36°F |
Maricopa County within AZ
Maricopa County ranks 15 of 15 AZ counties for nights below 20°F. The most is Coconino County, AZ at 67 nights, with a 20°F average winter low. At 884 ft, Maricopa County sits 3,188 ft below the state's median county elevation of 4,072 ft.
What to do here
- Disconnect hoses in a cold snap; no routine prep needed.
Even here, a once-a-decade freeze catches houses built without insulation: why pipes burst in warm places.
Where this comes from
NOAA 1991-2020 climate normals, blended from 3 nearby stations and adjusted for elevation; closest is Litchfield Park, AZ, 21 km away (fair match). A normal year, not tonight's forecast: check the forecast low for the night itself. Why elevation is part of the blend: how county numbers are made.