Photo: Original photo by National Park Service, edited by Shannon · Public domainClark Fork gets about 84 inches of snow a winter, more than 96% of U.S. towns
The warmest part of a July day comes in at 83° on average. Rain follows the seasons: November brings about 4.0 times as much as August. Precipitation is light here, less than falls on 87% of U.S. towns. Seedlings are safe outdoors from about May 9, with the first autumn frost due around October 8.
A year in Clark Fork at a glance
Each month’s typical high and low, and what it brings.
What stands out about Clark Fork’s climate
Compared with towns across the U.S., with Clark Fork’s place in Idaho beside it.
What a year in Clark Fork feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 153 frost-free days a year
In half of years the last 32° night comes by May 9 and the first by October 8. Frost and day counts come from NOAA’s station at Cabinet Gorge, ID, 7 miles from the town’s center, at about the same height.
The 2023 USDA map puts Clark Fork’s center in zone 6b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −3°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 84 inches of snow a winter
Snow, measured at Heron 2 Nw, MT, falls mostly in January and December. Precipitation (rain plus melted snow) adds up to 26 inches a year; November is the wettest month and August the driest. Rain or snow falls on about 154 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Clark Fork
97% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Cabinet Gorge, ID.
Living with Clark Fork’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
153 frost-free days in zone 6b. The last frost comes by May 9 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 8.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 0.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Clark Fork from natural hazards, avalanches are the largest share (61%); heat waves, cold waves, winter storms and ice storms together are 3%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Clark Fork and similar climates
TownRatings has no climate map of the towns around Clark Fork yet.
Climates most like Clark Fork’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Clark Fork, ID | 23° | 83° | 26" | 84" |
| Lewiston, NY | 19° | 81° | 34" | 72" |
| Big Bear Lake, CA | 25° | 80° | 24" | 59" |
| Norton Shores, MI | 19° | 82° | 36" | 87" |
| Flagstaff, AZ | 16° | 84° | 18" | 90" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Clark Fork averaged 1.3° warmer than the 1900s. The biggest change is in January (+4.1°).
A smaller shift than in 56% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Clark Fork compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Clark Fork’s place among Idaho’s.
Clark Fork weather by month
Highs, lows and precipitation from NOAA’s grid at Clark Fork’s center; snow, wet days and snow on the ground from Heron 2 Nw, MT. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 34° | 23° | 3.0" | 26.5" | 18 | 30 | 21° – 33° |
| February | 39° | 24° | 1.9" | 12.3" | 13 | 25 | 21° – 38° |
| March | 48° | 28° | 2.4" | 10.9" | 14 | 19 | 32° – 45° |
| April | 57° | 33° | 2.1" | 1.3" | 13 | 2 | 40° – 53° |
| May | 67° | 41° | 2.3" | 0.1" | 13 | 0 | 48° – 59° |
| June | 73° | 46° | 2.3" | 0.0" | 13 | 0 | 56° – 67° |
| July | 83° | 50° | 0.9" | 0.0" | 7 | 0 | 57° – 72° |
| August | 82° | 49° | 0.8" | 0.0" | 6 | 0 | 60° – 69° |
| September | 72° | 42° | 1.4" | 0.0" | 9 | 0 | 53° – 63° |
| October | 56° | 34° | 2.3" | 0.7" | 13 | 0 | 40° – 52° |
| November | 42° | 29° | 3.3" | 7.9" | 16 | 7 | 29° – 41° |
| December | 34° | 23° | 3.2" | 24.6" | 18 | 24 | 23° – 33° |
| Year | 57° | 35° | 25.9" | 84.3" | 154 | 107 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 21° to 38°. August is the most reliable, staying within 9°.
Where Clark Fork’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Clark Fork’s center.
- Snow: Heron 2 Nw, MT.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Cabinet Gorge, ID, 7 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Clark Fork’s climate
What is the weather like in Clark Fork?
A typical July afternoon reaches 83°, a January night drops to 23°, and about 84 inches of snow falls in a normal winter. Milder January nights than 54% of U.S. towns; cooler July afternoons than 76% of U.S. towns.
How cold does it get in Clark Fork in winter?
January nights average 23°. About 149 nights a year reach 32° or below and 2 reach 0° or below. In the coldest January of the last 30 years the month averaged 21°.
How much snow does Clark Fork get?
About 84 inches in a normal winter at Heron 2 Nw, MT, most of it in January and December, with snow on the ground about 107 days a year.
How hot does it get in Clark Fork?
July, with a typical high of 83° and a low of 50°. About 11 days a year reach 90° (Cabinet Gorge, ID).
When is the first and last frost in Clark Fork?
In half of years the last spring frost (32°) comes by May 9 and the first fall frost by October 8, about 153 frost-free days, at Cabinet Gorge, ID.
What growing zone is Clark Fork in?
Zone 6b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −3°.
What is the best time of year to visit Clark Fork?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Clark Fork getting warmer?
Yes: 1991–2020 averaged 1.3° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 56% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Clark Fork.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.