Delta Junction, AK climate
Delta Junction has cold, snowy winters and cool summers, with very little rain. A typical July afternoon reaches 70°, a January night drops to -8°, and about 45 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Delta Junction feels like
Winter
Spring
Summer
Fall
Delta Junction 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 | 6° | -8° | 0.2" | 6.1" | 7 | 31 |
| February | 16° | -1° | 0.2" | 4.6" | 5 | 27 |
| March | 25° | 4° | 0.2" | 4.0" | 5 | 30 |
| April | 44° | 24° | 0.2" | 3.1" | 4 | 13 |
| May | 59° | 38° | 0.8" | 1.7" | 8 | 0 |
| June | 68° | 49° | 2.2" | 0.1" | 12 | 0 |
| July | 70° | 52° | 2.4" | 0 | 15 | 0 |
| August | 65° | 47° | 2.0" | 0 | 15 | 0 |
| September | 53° | 36° | 0.9" | 2.3" | 10 | 1 |
| October | 33° | 20° | 0.6" | 7.3" | 8 | 16 |
| November | 15° | 1° | 0.4" | 7.8" | 9 | 29 |
| December | 9° | -5° | 0.2" | 8.0" | 8 | 30 |
| Year | 39° | 21° | 10.3" | 45.0" | 106 | 179 |
“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 Delta Junction
Delta Junction gets 10 inches of rain and melted snow a year. July is the wettest month and March the driest. Rain or snow falls on about 106 days a year. Snow covers the ground about 179 days of the year.
About 113 frost-free days a year
In half of years the last 32° night comes by May 17 and the first one by September 7. That leaves about 113 frost-free days for gardens, shorter than 98% of U.S. towns.
Heating and cooling a home in Delta Junction
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Delta Junction, 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.
Delta Junction and its neighbors
Delta Junction borders 2 towns with climate data. January nights across them vary by 7.8°. Big Delta has the coldest January nights (-16°) and Deltana the hottest July afternoons (71°). Delta Junction’s January low is -8° and its July high 70°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Delta Junction compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Common questions about Delta Junction’s climate
What is the coldest month in Delta Junction?
January, with a typical high of 6° and a low of -8°.
What is the hottest month in Delta Junction?
July, with a typical high of 70° and a low of 52°.
How much snow does Delta Junction get?
About 45 inches in a normal winter, most of it in December.
When is the first frost in Delta Junction?
In half of years the first 32° night comes by September 7, and the last spring frost by May 17.
What is the rainiest month in Delta Junction?
July, with 2.4 inches of rain and melted snow. The year totals 10 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 Delta 5 Ne, AK (3 mi, snow) and Big Delta Airport, AK (4 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020.