Declo, ID climate
Declo has chilly winters and warm summers, with very little rain. A typical July afternoon reaches 89°, a January night drops to 19°, and about 21 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Declo feels like
Winter
Spring
Summer
Fall
Declo 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 | 30-yr range |
|---|---|---|---|---|---|---|
| January | 37° | 19° | 1.0" | 6.7" | 9 | 19° – 36° |
| February | 42° | 22° | 0.6" | 4.2" | 7 | 23° – 40° |
| March | 52° | 28° | 0.9" | 1.2" | 6 | 34° – 45° |
| April | 60° | 33° | 1.1" | 0.5" | 7 | 42° – 51° |
| May | 69° | 41° | 1.5" | 0 | 7 | 49° – 60° |
| June | 79° | 48° | 0.8" | 0 | 4 | 58° – 69° |
| July | 89° | 54° | 0.4" | 0 | 2 | 62° – 76° |
| August | 87° | 52° | 0.4" | 0 | 3 | 65° – 73° |
| September | 78° | 44° | 0.7" | 0 | 4 | 57° – 64° |
| October | 63° | 34° | 0.8" | 0.7" | 5 | 41° – 55° |
| November | 48° | 25° | 0.7" | 2.6" | 6 | 29° – 44° |
| December | 37° | 19° | 1.0" | 4.6" | 8 | 23° – 34° |
| Year | 62° | 35° | 9.8" | 20.5" | 66 |
“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 Declo
Declo gets 10 inches of rain and melted snow a year. May is the wettest month and July the driest. Rain or snow falls on about 66 days a year.
About 150 frost-free days a year
In half of years the last 32° night comes by May 7 and the first one by October 4. That leaves about 150 frost-free days for gardens, shorter than 81% of U.S. towns.
Heating and cooling a home in Declo
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Declo, 93% of that work is heating and 7% 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 Declo 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 Declo averaged 1.8° warmer than the 1900s. The biggest change is in January (+4.0°). The shift is larger than in 86% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Declo’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. January swings the most: between 1991 and 2020 its average temperature ranged from 19° to 36°. September is the most reliable, staying within 7°.
Common questions about Declo’s climate
What is the coldest month in Declo?
December, with a typical high of 37° and a low of 19°.
What is the hottest month in Declo?
July, with a typical high of 89° and a low of 54°. About 33 days a year reach 90°.
How much snow does Declo get?
About 21 inches in a normal winter, most of it in January.
When is the first frost in Declo?
In half of years the first 32° night comes by October 4, and the last spring frost by May 7.
What is the rainiest month in Declo?
May, with 1.5 inches of rain and melted snow. The year totals 10 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Declo itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Minidoka Dam, ID (13 mi, snow) and Burley Municipal Airport, ID (7 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.