Idaho climate: Statewide normals, its places and each month, NOAA 1991-2020
Idaho's statewide normal is 43.9°F a year with 23.7 inches of precipitation (NOAA nClimDiv, 1991-2020); it has warmed 1.7°F per century since 1895, and 1934 was its warmest year.
- Statewide normal temperature
- 43.9°Fyear, 1991-2020
- Statewide normal precipitation
- 23.7 inyear, 1991-2020
- Last five years against normal
- +0.9°F2021-2025 mean 44.8°F
- Places with normals
- 14485 Census places, 59 other stations
What is Idaho's weather like each month?
Statewide, July is the warmest month and December the coldest. Each month has its own page with the warmest and coolest places that month:
- Jan33°17°
- Feb37°19°
- Mar46°25°
- Apr53°30°
- May63°37°
- Jun71°44°
- Jul82°51°
- Aug81°49°
- Sep71°42°
- Oct56°32°
- Nov41°24°
- Dec32°17°
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 33°F | 17°F | 25.1°F | 2.83 |
| February | 37°F | 19°F | 28.1°F | 2.19 |
| March | 46°F | 25°F | 35.2°F | 2.44 |
| April | 53°F | 30°F | 41.5°F | 2.19 |
| May | 63°F | 37°F | 50.1°F | 2.31 |
| June | 71°F | 44°F | 57.5°F | 1.79 |
| July | 82°F | 51°F | 66.4°F | 0.71 |
| August | 81°F | 49°F | 65.2°F | 0.71 |
| September | 71°F | 42°F | 56.4°F | 1.10 |
| October | 56°F | 32°F | 44.2°F | 1.86 |
| November | 41°F | 24°F | 32.5°F | 2.50 |
| December | 32°F | 17°F | 24.6°F | 3.04 |
Source: NOAA NCEI nClimDiv statewide series (Climate at a Glance); data files. Statewide values are area-weighted from a 5 km grid of station data, so they differ from the simple average of a state's stations.
Has Idaho been warmer than normal?
3 of the 5 complete years since 2021 ran warmer than the 1991-2020 statewide normal of 43.9°F. The record since 1895 rises at a fitted 1.7°F per century; the warmest year was 1934 (46.9°F).
| Year | Mean | Against normal |
|---|---|---|
| 2021 | 45.4°F | +1.5°F |
| 2022 | 43.5°F | −0.4°F |
| 2023 | 43.8°F | −0.1°F |
| 2024 | 45.3°F | +1.4°F |
| 2025 | 45.9°F | +2.0°F |
Source: NOAA NCEI nClimDiv statewide annual series.
Where is it warmest, wettest and snowiest in Idaho?
Among the places PlainClimate covers, Bruneau has the warmest year (55.2°F) and Dixie N the coolest (35.8°F); Mullan is the wettest (45.1 in) and Grand View the driest (6.7 in), and Elk City gets the most snow (119 in).
| Place | Year | July high | January low | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|
| Boise | 53.2°F | 93°F | 26°F | 11.5 | 18 | April 24 |
| Nampa | 52.0°F | 93°F | 23°F | 11.0 | 10 | April 29 |
| Idaho Falls | 44.2°F | 87°F | 12°F | 10.1 | – | May 23 |
| Pocatello | 47.0°F | 89°F | 17°F | 11.8 | 39 | May 23 |
| Coeur d'Alene | 48.8°F | 83°F | 26°F | 25.4 | – | April 22 |
| Twin Falls | 49.1°F | 88°F | 21°F | 10.3 | – | May 9 |
| Rexburg | 44.0°F | 85°F | 13°F | 12.0 | – | May 15 |
| Lewiston | 53.8°F | 91°F | 30°F | 12.9 | 13 | April 6 |
| Moscow | 46.4°F | 84°F | 22°F | 27.8 | 51 | – |
| Mountain Home | 52.3°F | 95°F | 23°F | – | – | May 2 |
| Jerome | 50.2°F | 90°F | 23°F | 9.9 | – | May 1 |
| Blackfoot | 47.2°F | 87°F | 17°F | 12.1 | 15 | May 5 |
| Burley | 49.0°F | 88°F | 21°F | 10.3 | – | May 7 |
| Sandpoint | 46.1°F | 82°F | 23°F | 34.0 | 62 | May 8 |
| Emmett | 51.5°F | 92°F | 23°F | 13.3 | 7 | April 30 |
| Payette | 53.2°F | 92°F | 24°F | 11.3 | – | April 19 |
| Preston | 47.0°F | 89°F | 15°F | 17.3 | 52 | May 16 |
| Weiser | 52.3°F | 95°F | 23°F | 13.4 | – | April 23 |
| Rigby | 45.9°F | 85°F | 15°F | 13.5 | – | May 9 |
| American Falls | 48.7°F | 90°F | 19°F | 11.1 | – | May 4 |
| Buhl | 50.2°F | 88°F | 22°F | 10.2 | – | April 25 |
| McCall | 41.5°F | 81°F | 14°F | 23.1 | – | June 10 |
| St. Anthony | 43.1°F | 83°F | 12°F | 14.8 | – | May 17 |
| Grangeville | 47.5°F | 82°F | 25°F | 23.5 | 39 | May 9 |
| Ketchum | 40.2°F | 80°F | 8°F | 17.3 | 102 | – |
| Salmon | 44.4°F | 86°F | 11°F | 9.5 | 22 | May 17 |
| Soda Springs | 42.4°F | 87°F | 10°F | 15.7 | – | – |
| Homedale | 51.8°F | 92°F | 23°F | 10.1 | – | April 24 |
| Bonners Ferry | 47.6°F | 85°F | 24°F | 21.1 | 54 | April 30 |
| Bellevue | 46.9°F | 88°F | 16°F | 17.5 | – | May 13 |
| St. Maries | 47.9°F | 84°F | 24°F | 31.1 | 56 | May 3 |
| Kellogg | 46.7°F | 85°F | 22°F | 33.9 | 52 | May 14 |
| Sugar City | 42.7°F | 83°F | 9°F | – | – | May 29 |
| Fort Hall | 45.4°F | 86°F | 15°F | 10.5 | 28 | May 20 |
| Driggs | 42.2°F | 83°F | 9°F | 19.4 | – | June 13 |
| Malad City | 46.8°F | 91°F | 15°F | 13.1 | – | May 22 |
| Parma | 51.5°F | 92°F | 23°F | 10.0 | 12 | April 27 |
| Aberdeen | 45.4°F | 87°F | 14°F | 9.6 | 25 | May 21 |
| Shoshone | 52.7°F | 94°F | 23°F | 10.5 | – | April 24 |
| Paul | 47.0°F | 85°F | 19°F | 10.8 | – | May 6 |
| Glenns Ferry | 54.6°F | 99°F | 25°F | 10.6 | – | May 1 |
| Kamiah | 50.9°F | 90°F | 26°F | 24.0 | 11 | April 29 |
| Plummer | 46.5°F | 81°F | 24°F | 28.5 | – | May 11 |
| Cascade | 43.3°F | 82°F | 15°F | 23.8 | 86 | May 30 |
| Hagerman | 50.6°F | 92°F | 22°F | 9.8 | – | May 3 |
| Ashton | 43.4°F | 83°F | 13°F | 19.7 | 70 | May 21 |
| Council | 49.2°F | 92°F | 18°F | 22.4 | – | May 10 |
| Grace | 43.7°F | 85°F | 13°F | 15.1 | – | May 29 |
| Challis | 44.4°F | 87°F | 11°F | 6.9 | – | May 14 |
| Cottonwood | 47.6°F | 81°F | 25°F | 22.6 | 61 | May 6 |
| Arco | 43.7°F | 87°F | 7°F | 8.8 | 24 | May 22 |
| Oakley | 49.6°F | 86°F | 21°F | 12.3 | 25 | May 15 |
| Hazelton | 48.6°F | 89°F | 20°F | 10.7 | – | May 7 |
| McCammon | 46.1°F | 87°F | 15°F | 15.5 | 45 | May 23 |
| Wallace | 46.0°F | 81°F | 24°F | 37.2 | 76 | May 5 |
| Potlatch | 46.9°F | 82°F | 26°F | 24.5 | 41 | May 15 |
| Mullan | 38.6°F | 70°F | 19°F | 45.1 | – | June 10 |
| New Meadows | 41.4°F | 85°F | 9°F | 24.5 | – | – |
| Downey | 45.6°F | 89°F | 14°F | 15.6 | – | May 31 |
| Kooskia | 49.2°F | 86°F | 25°F | – | – | April 30 |
| Idaho City | 43.8°F | 87°F | 14°F | 21.1 | – | June 17 |
| Dubois | 45.3°F | 87°F | 15°F | 12.2 | 47 | May 18 |
| Pierce | 43.6°F | 83°F | 19°F | 43.1 | 114 | June 3 |
| Fairfield | 42.1°F | 84°F | 9°F | 14.6 | – | June 8 |
| Mackay | 42.2°F | 83°F | 8°F | 9.9 | – | June 1 |
| Richfield | 46.1°F | 89°F | 14°F | 10.5 | 29 | May 24 |
| Nezperce | 44.9°F | 80°F | 22°F | 20.0 | 29 | May 24 |
| Grand View | 53.0°F | 93°F | 23°F | 6.7 | – | April 28 |
| Riggins | 50.2°F | 90°F | 25°F | 17.4 | 7 | May 6 |
| Lava Hot Springs | 45.0°F | 87°F | 14°F | 18.3 | – | May 21 |
| Winchester | 44.6°F | 78°F | 23°F | 21.8 | 87 | May 23 |
| Cambridge | 48.3°F | 93°F | 17°F | 21.4 | – | May 15 |
| Garden Valley | 46.8°F | 89°F | 19°F | 26.6 | 69 | June 1 |
| Swan Valley | 42.6°F | 85°F | 11°F | 20.1 | – | – |
| Tetonia | 39.4°F | 78°F | 8°F | 19.0 | – | June 15 |
| Elk City | 42.2°F | 83°F | 15°F | 30.6 | 119 | – |
| Castleford | 48.1°F | 88°F | 20°F | 10.7 | – | May 17 |
| Island Park | 36.8°F | 77°F | 6°F | 28.8 | – | – |
| Malta | 46.2°F | 88°F | 17°F | 9.6 | 12 | June 5 |
| Stanley | 37.4°F | 80°F | 4°F | 17.9 | – | – |
| Leadore | 39.1°F | 83°F | 5°F | – | – | – |
| Minidoka | 48.6°F | 89°F | 18°F | 9.8 | 21 | May 16 |
| Hamer | 43.8°F | 89°F | 7°F | 8.9 | 20 | June 3 |
| Lowman | 44.3°F | 87°F | 16°F | – | – | June 6 |
| Bruneau | 55.2°F | 96°F | 27°F | 7.4 | – | April 17 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
What are Idaho's all-time weather records?
The official state records, reviewed by NOAA's State Climate Extremes Committee: from 118°F to −60°F.
| Record | Value | Where | When |
|---|---|---|---|
| Highest temperature | 118°F | Orofino | July 28, 1934 |
| Lowest temperature | −60°F | Island Park Dam | January 18, 1943 |
| Most precipitation in 24 hours | 7.17 in | Rattlesnake Creek | November 23, 1909 |
| Most snow in 24 hours | 31 in | Anderson Dam | December 18, 1967 |
| Deepest snow on the ground | 182 in | Mullan Pass VOR/DME (tied 2 times; the latest shown) | February 22, 1954 |
Source: NOAA NCEI State Climate Extremes Committee records.
Which large cities in Idaho have no climate record of their own?
These 2 cities of 50,000 or more have no NOAA record with 1991-2020 normals under their own name; each page compares the nearest records, with their distance and elevation.
Which other NOAA stations in Idaho keep normals?
59 stations in Idaho that are not a town's own record keep 1991-2020 normals too: reservoirs and dams, parks and forests, research farms, remote sites and the second stations of towns (those are shown on the town's page). Each with its normal yearly mean:
- American Falls (6 mi NE)46.7°F
- Arco (17 mi SW)43.0°F
- Arrowrock Dam51.0°F
- Bayview Model Basin45.0°F
- Bern41.1°F
- Boise (7 mi N)49.8°F
- Boise Lucky Peak Dam52.8°F
- Brownlee Dam55.0°F
- Cabinet Gorge46.2°F
- Chilly Barton Flat41.0°F
- Craters Of The Moon39.1°F
- Deadwood Lodge39.3°F
- Deer Flat Dam52.5°F
- Dixie36.7°F
- Dixie N35.8°F
- Dworshak Fish Hatchery51.7°F
- Elk River44.8°F
- Fenn Ranger Station49.9°F
- Gibbonsville #242.2°F
- Headquarters42.6°F
- Hill City (1 mi W)42.1°F
- Howe44.0°F
- Idaho Falls - Kifi46.5°F
- Idaho Falls (16 mi SE)42.1°F
- Idaho Falls (46 mi W)42.7°F
- Jerome station50.1°F
- Lifton Pumping Station41.0°F
- Lowell Three Rivers51.8°F
- Malta (4 mi ESE)47.9°F
- Massacre Rocks State Park47.3°F
- May (2 mi SSE)42.4°F
- McCall station41.2°F
- Middle Fork Lodge45.1°F
- Monteview41.6°F
- Mullan station45.1°F
- Murphy (10 mi W)48.4°F
- Murphy (Desert) Hot Springs45.2°F
- Ola47.9°F
- Picabo42.4°F
- Pocatello (2 mi NE)48.7°F
- Pocatello City50.2°F
- Porthill (1 mi SW)47.3°F
- Powell42.7°F
- Prichard (3 mi ESE)44.0°F
- Priest River Experiment Station44.7°F
- Red River Ranger Station41.4°F
- Rexburg BYU Idaho44.8°F
- Reynolds47.8°F
- Shoup47.8°F
- Silver City (5 mi W)46.2°F
- Small (6 mi N)42.5°F
- Stanley station34.4°F
- Swan Falls Powerhouse55.2°F
- Taylor Ranch45.8°F
- Twin Falls (6 mi E)48.9°F
- Twin Falls-KMVT51.6°F
- Warren38.3°F
- Yellowpine43.9°F
- Yellowpine Bar49.5°F
Source: NOAA NCEI 1991-2020 normals for each station.
Next
- Frost dates in IdahoLast spring and first autumn frost at every station
- Every stateCompare the statewide normals
- Bruneau55.2°F a year, 7.4 in of precipitation
- Dixie N35.8°F a year, 33.6 in of precipitation
- Mullan38.6°F a year, 45.1 in of precipitation
- Elk City42.2°F a year, 30.6 in of precipitation
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