Swan Valley, ID climate
Swan Valley has cold, snowy winters and pleasant summers, with very little rain. A typical July afternoon reaches 83°, a January night drops to 11°, and about 66 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Swan Valley feels like
Winter
Spring
Summer
Fall
Swan Valley 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 | 29° | 11° | 1.7" | 17.0" | 10 | 30 | 12° – 26° |
| February | 34° | 13° | 1.2" | 11.8" | 9 | 25 | 18° – 30° |
| March | 44° | 22° | 1.4" | 7.6" | 9 | 18 | 26° – 39° |
| April | 54° | 28° | 1.7" | 2.9" | 10 | 2 | 35° – 46° |
| May | 64° | 36° | 2.2" | 0.9" | 10 | 0 | 45° – 55° |
| June | 73° | 42° | 1.8" | 0.2" | 8 | 0 | 52° – 62° |
| July | 83° | 48° | 0.9" | 0 | 5 | 0 | 56° – 72° |
| August | 82° | 46° | 1.1" | 0 | 6 | 0 | 58° – 69° |
| September | 73° | 38° | 1.4" | 0 | 5 | 0 | 52° – 60° |
| October | 58° | 29° | 1.6" | 1.7" | 7 | 1 | 35° – 50° |
| November | 42° | 20° | 1.5" | 7.6" | 8 | 10 | 22° – 39° |
| December | 30° | 12° | 1.6" | 16.0" | 11 | 25 | 17° – 27° |
| Year | 55° | 29° | 18.0" | 65.7" | 97 | 111 |
“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 Swan Valley
Swan Valley gets 18 inches of rain and melted snow a year. May is the wettest month and July the driest. Rain or snow falls on about 97 days a year. Snow covers the ground about 111 days of the year.
A year-round growing season
Heating and cooling a home in Swan Valley
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Swan Valley, 98% of that work is heating and 2% 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 Swan Valley 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 Swan Valley averaged 1.1° warmer than the 1900s. The biggest change is in March (+3.1°). The shift is smaller than in 61% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Swan Valley’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 22° to 39°. September is the most reliable, staying within 8°.
Common questions about Swan Valley’s climate
What is the coldest month in Swan Valley?
January, with a typical high of 29° and a low of 11°.
What is the hottest month in Swan Valley?
July, with a typical high of 83° and a low of 48°. About 14 days a year reach 90°.
How much snow does Swan Valley get?
About 66 inches in a normal winter, most of it in January.
When is the first frost in Swan Valley?
Frost is uncommon. Only 100% of years see a night at 32° or below.
What is the rainiest month in Swan Valley?
May, with 2.2 inches of rain and melted snow. The year totals 18 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Swan Valley itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Idaho Falls 16 Se, ID (24 mi, snow) and Swan Valley, ID (2 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.