Island Park, ID climate
Island Park has cold, snowy winters and pleasant summers. A typical July afternoon reaches 78°, a January night drops to 6°, and about 177 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Island Park feels like
Winter
Spring
Summer
Fall
Island Park 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 | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 26° | 6° | 3.1" | 43.8" | 14 | 31 | 10° – 22° |
| February | 31° | 7° | 2.6" | 33.7" | 11 | 29 | 14° – 25° |
| March | 40° | 16° | 2.6" | 20.6" | 9 | 30 | 22° – 33° |
| April | 48° | 24° | 2.5" | 7.7" | 10 | 19 | 30° – 41° |
| May | 59° | 32° | 2.9" | 1.2" | 12 | 2 | 40° – 50° |
| June | 68° | 38° | 2.5" | 0 | 12 | 0 | 47° – 60° |
| July | 78° | 43° | 1.2" | 0 | 8 | 0 | 51° – 67° |
| August | 77° | 41° | 1.2" | 0 | 6 | 0 | 54° – 63° |
| September | 67° | 34° | 1.5" | 0 | 6 | 0 | 47° – 55° |
| October | 51° | 25° | 2.0" | 4.1" | 8 | 2 | 29° – 45° |
| November | 36° | 15° | 2.6" | 20.9" | 10 | 20 | 17° – 34° |
| December | 26° | 6° | 3.6" | 45.2" | 13 | 31 | 12° – 22° |
| Year | 50° | 24° | 28.3" | 177.2" | 118 | 162 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Island Park
Island Park gets 28 inches of rain and melted snow a year. December is the wettest month and August the driest. Rain or snow falls on about 118 days a year. Snow covers the ground about 162 days of the year.
A year-round growing season
Heating and cooling a home in Island Park
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Island Park, 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 Island Park compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Island Park averaged 1.4° warmer than the 1900s. The biggest change is in March (+3.6°). The shift is larger than in 61% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Island Park’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. November swings the most: between 1991 and 2020 its average temperature ranged from 17° to 34°. September is the most reliable, staying within 8°.
Common questions about Island Park’s climate
What is the coldest month in Island Park?
January, with a typical high of 26° and a low of 6°.
What is the hottest month in Island Park?
July, with a typical high of 78° and a low of 43°. About 3 days a year reach 90°.
How much snow does Island Park get?
About 177 inches in a normal winter, most of it in December.
When is the first frost in Island Park?
Frost is uncommon. Only 100% of years see a night at 32° or below.
What is the rainiest month in Island Park?
December, with 3.6 inches of rain and melted snow. The year totals 28 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Island Park itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Hebgen Dam, MT (23 mi, snow) and Island Park, ID (8 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.