Mill Bay, AK climate
Mill Bay has chilly, snowy winters and cool summers, with plenty of rain. A typical July afternoon reaches 60°, a January night drops to 27°, and about 43 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Mill Bay feels like
Winter
Spring
Summer
Fall
Mill Bay weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 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 | 17 | 0 |
| July | 60° | 50° | 4.5" | 0 | 16 | 0 |
| August | 61° | 50° | 5.0" | 0 | 18 | 0 |
| September | 55° | 45° | 7.3" | 0 | 21 | 0 |
| October | 47° | 38° | 8.3" | 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 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more.
Rain and snow in Mill Bay
Mill Bay gets 76 inches of rain and melted snow a year. October is the wettest month and July the driest. Rain or snow falls on about 225 days a year. Snow covers the ground about 59 days of the year.
About 168 frost-free days a year
In half of years the last 32° night comes by April 29 and the first one by October 14. That leaves about 168 frost-free days for gardens, shorter than 63% of U.S. towns.
Heating and cooling a home in Mill Bay
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Mill Bay, 100% of that work is heating and 0% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Mill Bay compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Common questions about Mill Bay’s climate
What is the coldest month in Mill Bay?
January, with a typical high of 36° and a low of 27°.
What is the hottest month in Mill Bay?
August, with a typical high of 61° and a low of 50°.
How much snow does Mill Bay get?
About 43 inches in a normal winter, most of it in January.
When is the first frost in Mill Bay?
In half of years the first 32° night comes by October 14, and the last spring frost by April 29.
What is the rainiest month in Mill Bay?
October, with 8.3 inches of rain and melted snow. The year totals 76 inches.
NOAA’s gridded normals don’t cover this state, so temperatures and rainfall come from the nearest weather station. Snow, frost dates and day counts come from NOAA’s weather station at Kodiak WWTP, AK (1 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020.