Kodiak Naval Operating Base and Forts Greely and Abercrombie · Photo: U.S. Coast Guard, SPC Jeff Parks · Public domainMill Bay’s winters are milder but snowier than most of the U.S.
A typical July afternoon reaches 60°, a January night drops to 27°, and about 43 inches of snow falls in a normal winter.
A year in Mill Bay at a glance
Each month’s typical high and low, and what it brings.
What stands out about Mill Bay’s climate
Compared with towns across the U.S., with Mill Bay’s place in Alaska beside it.
What a year in Mill Bay feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 168 frost-free days a year
In half of years the last 32° night comes by April 29 and the first by October 14. Frost and day counts come from NOAA’s station at Kodiak Wwtp, AK, 0.9 miles from the town’s center, at about the same height.
The 2023 USDA map puts Mill Bay’s center in zone 7b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 7°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
About 43 inches of snow a winter
Snow, measured at Kodiak Wwtp, AK, falls mostly in January. Precipitation (rain plus melted snow) adds up to 76 inches a year; October is the wettest month and July the driest. Rain or snow falls on about 225 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Mill Bay
Nearly all of the work is heating: a normal year has almost no cooling days. Months averaging under 55°: every month but August.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Kodiak Wwtp, AK.
Living with Mill Bay’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
168 frost-free days in zone 7b. The last frost comes by Apr 29 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 14.
5.7 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Mill Bay from natural hazards, earthquakes are the largest share (76%). Normals are averages; the hazards page covers the extremes.
Natural hazards →Mill Bay and similar climates
TownRatings has no climate map of the towns around Mill Bay yet.
Climates most like Mill Bay’s, 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 |
|---|---|---|---|---|
| Mill Bay, AK | 27° | 60° | 76" | 43" |
| Florence, OR | 40° | 66° | 73" | 0.6" |
| Hoquiam, WA | 37° | 68° | 81" | 0.5" |
| Crescent City, CA | 42° | 64° | 69" | 0.0" |
| Rockland, ME | 14° | 75° | 49" | 69" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
How Mill Bay compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Mill Bay’s place among Alaska’s.
Mill Bay weather by month
Highs, lows and precipitation from the nearest NOAA station; snow, wet days and snow on the ground from Kodiak Wwtp, AK. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground |
|---|---|---|---|---|---|---|
| January | 36° | 27° | 7.9" | 10.7" | 21 | 13 |
| February | 37° | 28° | 6.0" | 6.3" | 17 | 12 |
| March | 38° | 28° | 5.1" | 8.6" | 17 | 13 |
| April | 43° | 34° | 5.6" | 2.9" | 19 | 3 |
| May | 50° | 40° | 5.4" | 0.3" | 18 | 0 |
| June | 55° | 45° | 5.1" | 0.0" | 17 | 0 |
| July | 60° | 50° | 4.5" | 0.0" | 16 | 0 |
| August | 61° | 50° | 5.0" | 0.0" | 18 | 0 |
| September | 55° | 45° | 7.3" | 0.0" | 21 | 0 |
| October | 47° | 38° | 8.3" | 0.0" | 22 | 0 |
| November | 41° | 32° | 7.1" | 6.3" | 19 | 8 |
| December | 37° | 28° | 8.3" | 7.8" | 22 | 10 |
| Year | 47° | 37° | 75.6" | 42.9" | 225 | 59 |
Where Mill Bay’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).
- Snow: Kodiak Wwtp, AK (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Kodiak Wwtp, AK, 0.9 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 Mill Bay’s climate
What is the weather like in Mill Bay?
A typical July afternoon reaches 60°, a January night drops to 27°, and about 43 inches of snow falls in a normal winter. Milder January nights than 68% of U.S. towns; cooler July afternoons than all but 3 U.S. towns.
How cold does it get in Mill Bay in winter?
January nights average 27°. About 121 nights a year reach 32° or below.
How much snow does Mill Bay get?
About 43 inches in a normal winter at Kodiak Wwtp, AK, most of it in January, with snow on the ground about 59 days a year.
How hot does it get in Mill Bay?
July, with a typical high of 60°. 90° days are rare: none in a normal year at Kodiak Wwtp, AK.
When is the first and last frost in Mill Bay?
In half of years the last spring frost (32°) comes by April 29 and the first fall frost by October 14, about 168 frost-free days, at Kodiak Wwtp, AK.
What growing zone is Mill Bay in?
Zone 7b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 7°.
What is the best time of year to visit Mill Bay?
No month meets the simple rule we use (highs of 62–84° and lows of 40° or more). 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 Mill Bay.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.