Arrowrock Dam · Public domainDry weather: only 21 inches of rain and melted snow a year in Robie Creek, less than in 89% of U.S. towns
High summer brings afternoon highs near 89°. Rain follows the seasons: December brings about 12 times as much as August. Summer afternoons here are warmer than in 71% of U.S. towns. Garden planting can start around May 17; autumn frost returns near October 12.
A year in Robie Creek at a glance
Each month’s typical high and low, and what it brings.
What stands out about Robie Creek’s climate
Compared with towns across the U.S., with Robie Creek’s place in Idaho beside it.
What a year in Robie Creek feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 147 frost-free days a year
In half of years the last 32° night comes by May 17 and the first by October 12. Frost and day counts come from NOAA’s station at Boise 7 N, ID, 11 miles from the town’s center, 280 ft lower.
The 2023 USDA map puts Robie Creek’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 1°. 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 57 inches of snow a winter
Snow, measured at Boise 7 N, ID, falls mostly in December. Precipitation (rain plus melted snow) adds up to 21 inches a year; December is the wettest month and August the driest. Rain or snow falls on about 111 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Robie Creek
90% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Boise 7 N, ID.
Living with Robie Creek’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
147 frost-free days in zone 7a. The last frost comes by May 17 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 12.
Months with highs of 62–84° and lows of 40° or more: May, June and September. 52 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Robie Creek from natural hazards, wildfire is the largest share (58%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Robie Creek and similar climates
TownRatings has no climate map of the towns around Robie Creek yet.
Climates most like Robie Creek’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 |
|---|---|---|---|---|
| Robie Creek, ID | 24° | 89° | 21" | 57" |
| Draper, UT | 22° | 89° | 23" | 74" |
| Lakewood, CO | 20° | 88° | 18" | 58" |
| Suncrest, WA | 23° | 87° | 16" | 48" |
| Altamont, OR | 22° | 86° | 13" | 52" |
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 Robie Creek averaged 1.1° warmer than the 1900s. The biggest change is in January (+2.6°).
A smaller shift than in 74% 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 Robie Creek compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Robie Creek’s place among Idaho’s.
Robie Creek weather by month
Highs, lows and precipitation from NOAA’s grid at Robie Creek’s center; snow, wet days and snow on the ground from Boise 7 N, ID. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 37° | 24° | 3.2" | 14.0" | 14 | 19 | 21° – 37° |
| February | 43° | 27° | 2.2" | 9.2" | 12 | 13 | 28° – 41° |
| March | 51° | 31° | 2.3" | 6.6" | 13 | 4 | 36° – 47° |
| April | 58° | 36° | 1.9" | 2.4" | 11 | 0 | 41° – 52° |
| May | 68° | 43° | 1.9" | 0.7" | 11 | 0 | 49° – 61° |
| June | 77° | 49° | 1.1" | 0.1" | 7 | 0 | 58° – 71° |
| July | 89° | 57° | 0.3" | 0.0" | 4 | 0 | 62° – 79° |
| August | 87° | 56° | 0.3" | 0.0" | 3 | 0 | 66° – 75° |
| September | 77° | 48° | 0.6" | 0.0" | 5 | 0 | 58° – 67° |
| October | 62° | 38° | 1.4" | 0.4" | 8 | 0 | 42° – 57° |
| November | 46° | 30° | 2.5" | 7.3" | 12 | 6 | 30° – 44° |
| December | 37° | 24° | 3.4" | 16.7" | 14 | 18 | 23° – 35° |
| Year | 61° | 38° | 21.2" | 57.4" | 111 | 60 |
How much a month can swing
A normal is an average. July swings the most: from 1991 to 2020 its average ranged from 62° to 79°. August is the most reliable, staying within 9°.
Where Robie Creek’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 Robie Creek’s center.
- Snow: Boise 7 N, ID.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Boise 7 N, ID, 11 miles from the town’s center, 280 ft lower; 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 Robie Creek’s climate
What is the weather like in Robie Creek?
A typical July afternoon reaches 89°, a January night drops to 24°, and about 57 inches of snow falls in a normal winter. Milder January nights than 59% of U.S. towns; hotter July afternoons than 71% of U.S. towns.
How cold does it get in Robie Creek in winter?
January nights average 24°. About 125 nights a year reach 32° or below and 1 reach 0° or below. In the coldest January of the last 30 years the month averaged 21°.
How much snow does Robie Creek get?
About 57 inches in a normal winter at Boise 7 N, ID, most of it in December, with snow on the ground about 60 days a year.
How hot does it get in Robie Creek?
July, with a typical high of 89° and a low of 57°. About 29 days a year reach 90° and 1 reach 100° (Boise 7 N, ID).
When is the first and last frost in Robie Creek?
In half of years the last spring frost (32°) comes by May 17 and the first fall frost by October 12, about 147 frost-free days, at Boise 7 N, ID.
What growing zone is Robie Creek in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 1°.
What is the best time of year to visit Robie Creek?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Robie Creek getting warmer?
Yes: 1991–2020 averaged 1.1° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 74% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Robie Creek.
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.