Riggins, ID climate
Riggins has chilly winters and warm summers, with very little rain. A typical July afternoon reaches 91°, a January night drops to 26°, and about 7 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Riggins feels like
Winter
Spring
Summer
Fall
Riggins 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 | 41° | 26° | 1.1" | 2.1" | 12 | 1 | 28° – 38° |
| February | 46° | 28° | 1.1" | 2.3" | 10 | 1 | 30° – 43° |
| March | 55° | 32° | 1.9" | 0.1" | 13 | 0 | 38° – 50° |
| April | 63° | 36° | 1.9" | 0 | 14 | 0 | 44° – 57° |
| May | 72° | 43° | 2.3" | 0 | 13 | 0 | 52° – 62° |
| June | 79° | 49° | 2.0" | 0 | 10 | 0 | 61° – 73° |
| July | 91° | 55° | 0.8" | 0 | 5 | 0 | 62° – 80° |
| August | 91° | 54° | 0.7" | 0 | 4 | 0 | 67° – 76° |
| September | 80° | 46° | 1.0" | 0 | 5 | 0 | 59° – 68° |
| October | 64° | 37° | 1.4" | 0 | 8 | 0 | 41° – 57° |
| November | 49° | 31° | 1.3" | 0.6" | 12 | 0 | 35° – 47° |
| December | 39° | 26° | 1.2" | 2.0" | 12 | 1 | 26° – 37° |
| Year | 64° | 39° | 16.7" | 7.1" | 116 | 3 |
“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 Riggins
Riggins gets 17 inches of rain and melted snow a year. May is the wettest month and August the driest. Rain or snow falls on about 116 days a year.
About 155 frost-free days a year
In half of years the last 32° night comes by May 6 and the first one by October 9. That leaves about 155 frost-free days for gardens, shorter than 76% of U.S. towns.
Heating and cooling a home in Riggins
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Riggins, 91% of that work is heating and 9% 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 Riggins 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 Riggins averaged 1.5° warmer than the 1900s. The biggest change is in January (+3.7°). The shift is larger than in 69% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Riggins’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. July swings the most: between 1991 and 2020 its average temperature ranged from 62° to 80°. September is the most reliable, staying within 9°.
Common questions about Riggins’s climate
What is the coldest month in Riggins?
December, with a typical high of 39° and a low of 26°.
What is the hottest month in Riggins?
July, with a typical high of 91° and a low of 55°. About 57 days a year reach 90°.
How much snow does Riggins get?
About 7 inches in a normal winter, most of it in February.
When is the first frost in Riggins?
In half of years the first 32° night comes by October 9, and the last spring frost by May 6.
What is the rainiest month in Riggins?
May, with 2.3 inches of rain and melted snow. The year totals 17 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Riggins itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Riggins, ID (6 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.