Glenns Ferry, ID climate
Glenns Ferry has chilly winters and hot summers, with very little rain. A typical July afternoon reaches 96°, a January night drops to 24°.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Glenns Ferry feels like
Winter
Spring
Summer
Fall
Glenns Ferry weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 41° | 24° | 1.3" | 23° – 38° |
| February | 48° | 27° | 0.7" | 29° – 45° |
| March | 58° | 32° | 0.9" | 40° – 50° |
| April | 66° | 37° | 0.7" | 45° – 57° |
| May | 76° | 45° | 0.8" | 54° – 67° |
| June | 86° | 52° | 0.5" | 64° – 76° |
| July | 96° | 59° | 0.2" | 67° – 83° |
| August | 94° | 56° | 0.1" | 69° – 78° |
| September | 83° | 47° | 0.3" | 61° – 70° |
| October | 68° | 36° | 0.7" | 46° – 59° |
| November | 52° | 29° | 0.9" | 32° – 47° |
| December | 40° | 23° | 1.3" | 26° – 38° |
| Year | 67° | 39° | 8.3" |
“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 Glenns Ferry
Glenns Ferry gets 8 inches of rain and melted snow a year. December is the wettest month and August the driest.
About 154 frost-free days a year
In half of years the last 32° night comes by May 1 and the first one by October 3. That leaves about 154 frost-free days for gardens, shorter than 77% of U.S. towns.
Heating and cooling a home in Glenns Ferry
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Glenns Ferry, 81% of that work is heating and 19% 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 Glenns Ferry 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 Glenns Ferry averaged 1.3° warmer than the 1900s. The biggest change is in January (+3.2°). The shift is larger than in 58% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Glenns Ferry’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 67° to 83°. September is the most reliable, staying within 8°.
Common questions about Glenns Ferry’s climate
What is the coldest month in Glenns Ferry?
December, with a typical high of 40° and a low of 23°.
What is the hottest month in Glenns Ferry?
July, with a typical high of 96° and a low of 59°. About 82 days a year reach 90°.
When is the first frost in Glenns Ferry?
In half of years the first 32° night comes by October 3, and the last spring frost by May 1.
What is the rainiest month in Glenns Ferry?
December, with 1.3 inches of rain and melted snow. The year totals 8 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Glenns Ferry itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Glenns Ferry, ID (1 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.