Will Pipes Freeze in Honolulu County, HI? No Normal Risk Nights
Freeze nights in Honolulu County
A normal winter in Honolulu County, HI 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 | none |
| 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.
How cold Honolulu County nights get
Average winter (Dec-Feb) low: 65°F; the coldest month, February, averages 64°F overnight. No month normally brings a night below 32°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 65°F | 64°F | 65°F | 66°F | 68°F | 69°F | 71°F | 71°F | 71°F | 70°F | 69°F | 67°F |
Honolulu County next to its neighbours
Aleutians East Borough, AK, 3770 km north, gets 38 nights below 20°F to Honolulu County's none.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Honolulu County, HI | - | none | none | 65°F |
| Kalawao County, HI | 130 km east | none | none | 64°F |
| Kauai County, HI | 167 km west | none | none | 64°F |
| Maui County, HI | 179 km east | none | none | 54°F |
| Hawaii County, HI | 349 km southeast | 22 nights | none | 41°F |
| Aleutians East Borough, AK | 3770 km north | 141 nights | 38 nights | 24°F |
| San Francisco County, CA | 3820 km northeast | 3 nights | none | 44°F |
Honolulu County within HI
Honolulu County ranks 4 of 5 HI counties for nights below 20°F. The most is Hawaii County, HI at none, with a 41°F average winter low. The fewest is Kalawao County, HI: none, winter lows near 65°F. At 21 ft, Honolulu County sits 807 ft below the state's median county elevation of 828 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 Makaha Ctry Club 800.3, HI, 2 km away (close match). A normal year, not tonight's forecast: check the forecast low for the night itself. What a "fair" or "distant" station match means is in the method guide.