Sterling sits near the bottom of U.S. towns for July heat
Deep winter brings January lows near 8°. Winter and summer sit 58° apart. Its January nights bite harder than in 95% of U.S. towns. Comfortable outdoor weather lasts from June to August, with highs of 63–66°.
A year in Sterling at a glance
Each month’s typical high and low, and what it brings.
What stands out about Sterling’s climate
Compared with towns across the U.S., with Sterling’s place in Alaska beside it.
What a year in Sterling feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 123 frost-free days a year
In half of years the last 32° night comes by May 20 and the first by September 21. Frost and day counts come from NOAA’s station at Sterling 6sw, AK, 5 miles from the town’s center, at about the same height.
The 2023 USDA map puts Sterling’s center in zone 4b: 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°
About 23 inches of rain a year
September is the wettest month and March the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Sterling
Nearly all of the work is heating: a normal year has almost no cooling days. Months averaging under 55° run from September through June.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Sterling 6sw, AK.
Living with Sterling’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
123 frost-free days in zone 4b. The last frost comes by May 20 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Sep 21.
Months with highs of 62–84° and lows of 40° or more: June, July and August. 12 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Sterling from natural hazards, avalanches are the largest share (48%). Normals are averages; the hazards page covers the extremes.
Natural hazards →Sterling and its neighbors
Soldotna has the coldest January nights next door (5°, 3° colder). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
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.
How Sterling compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Sterling’s place among Alaska’s.
Sterling weather by month
Highs, lows and precipitation from the nearest NOAA station. 1991–2020 normals.
| Month | High | Low | Rain + melt |
|---|---|---|---|
| January | 22° | 8° | 1.3" |
| February | 28° | 12° | 1.8" |
| March | 33° | 15° | 0.9" |
| April | 46° | 28° | 0.9" |
| May | 56° | 35° | 1.0" |
| June | 63° | 44° | 1.7" |
| July | 66° | 49° | 2.4" |
| August | 64° | 47° | 3.2" |
| September | 55° | 40° | 3.5" |
| October | 42° | 28° | 2.8" |
| November | 28° | 15° | 1.8" |
| December | 23° | 10° | 1.8" |
| Year | 44° | 28° | 23.1" |
Where Sterling’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s 1991–2020 normals at the nearest station (NOAA’s grid doesn’t cover Alaska).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Sterling 6sw, AK, 5 miles from the town’s center, at about the same height; 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.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Sterling’s climate
What is the weather like in Sterling?
A typical July afternoon reaches 66°, a January night drops to 8°. Colder January nights than 95% of U.S. towns; cooler July afternoons than all but 35 U.S. towns.
How cold does it get in Sterling in winter?
January nights average 8°. About 200 nights a year reach 32° or below and 32 reach 0° or below.
How hot does it get in Sterling?
July, with a typical high of 66°. 90° days are rare: none in a normal year at Sterling 6sw, AK.
When is the first and last frost in Sterling?
In half of years the last spring frost (32°) comes by May 20 and the first fall frost by September 21, about 123 frost-free days, at Sterling 6sw, AK.
What growing zone is Sterling in?
Zone 4b 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 Sterling?
By one simple rule (highs of 62–84° and lows of 40° or more), June, July and August. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Neighbors talk weather
Gardens, snow, and the best days of the year in Sterling.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.