Photo: StormChaserAmelia · CC BY-SA 4.0Boise City reaches 100° on about 10 days a year, more than 91% of U.S. towns
Deep winter brings January lows near 20°. It is a dry place: less rain and snow fall here than on 91% of U.S. towns. Warming shows here too: 0.7° more than in 1901–2000, led by March. The frost-free window for a garden runs roughly April 26 to October 17.
A year in Boise City at a glance
Each month’s typical high and low, and what it brings.
What stands out about Boise City’s climate
Compared with towns across the U.S., with Boise City’s place in Oklahoma beside it.
What a year in Boise City feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 173 frost-free days a year
In half of years the last 32° night comes by April 26 and the first by October 17. Frost and day counts come from NOAA’s station at Boise City 2 E, OK, 1.7 miles from the town’s center, at about the same height.
The 2023 USDA map puts Boise City’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 32 inches of snow a winter
Snow, measured at Boise City 2 E, OK, falls mostly in January, March and December. Precipitation (rain plus melted snow) adds up to 17 inches a year; July is the wettest month and February the driest. Rain or snow falls on about 52 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Boise City
77% of the work is heating. Months averaging under 55° run from November 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 City 2 E, OK.
Living with Boise City’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
173 frost-free days in zone 6b. The last frost comes by Apr 26 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 17.
Months with highs of 62–84° and lows of 40° or more: May, September and October.
Parks & trails →Of the yearly building losses FEMA expects in Boise City from natural hazards, lightning is the largest share (37%); heat waves, cold waves, winter storms and ice storms together are 17%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Boise City and similar climates
TownRatings has no climate map of the towns around Boise City yet.
Climates most like Boise City’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 |
|---|---|---|---|---|
| Boise City, OK | 20° | 92° | 17" | 32" |
| American Fork, UT | 20° | 92° | 17" | 26" |
| Sterling, CO | 16° | 91° | 16" | 37" |
| Colby, KS | 17° | 91° | 20" | 27" |
| Sidney, NE | 15° | 89° | 17" | 29" |
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 Boise City averaged 0.7° warmer than the 1900s. The biggest change is in March (+2.3°).
A smaller shift than in 95% 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 Boise City compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Boise City’s place among Oklahoma’s.
Boise City weather by month
Highs, lows and precipitation from NOAA’s grid at Boise City’s center; snow, wet days and snow on the ground from Boise City 2 E, OK. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 49° | 20° | 0.5" | 7.3" | 3 | 24° – 41° |
| February | 53° | 23° | 0.3" | 2.5" | 3 | 31° – 46° |
| March | 61° | 30° | 1.0" | 7.2" | 4 | 40° – 51° |
| April | 69° | 37° | 1.4" | 2.3" | 4 | 46° – 59° |
| May | 78° | 48° | 1.8" | 0.2" | 6 | 58° – 68° |
| June | 88° | 58° | 2.0" | 0.0" | 6 | 67° – 77° |
| July | 92° | 63° | 3.0" | 0.0" | 7 | 73° – 82° |
| August | 89° | 61° | 3.0" | 0.0" | 7 | 71° – 81° |
| September | 82° | 53° | 1.6" | 0.0" | 4 | 61° – 73° |
| October | 71° | 40° | 1.4" | 1.3" | 3 | 49° – 61° |
| November | 59° | 29° | 0.5" | 3.1" | 3 | 37° – 50° |
| December | 49° | 21° | 0.6" | 7.9" | 3 | 28° – 38° |
| Year | 70° | 40° | 17.2" | 31.8" | 52 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 24° to 41°. June is the most reliable, staying within 9°.
Where Boise City’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 Boise City’s center.
- Snow: Boise City 2 E, OK (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Boise City 2 E, OK, 1.7 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 Boise City’s climate
What is the weather like in Boise City?
A typical July afternoon reaches 92°, a January night drops to 20°, and about 32 inches of snow falls in a normal winter. Colder January nights than 57% of U.S. towns; hotter July afternoons than 86% of U.S. towns.
How cold does it get in Boise City in winter?
January nights average 20°. About 135 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 24°.
How much snow does Boise City get?
About 32 inches in a normal winter at Boise City 2 E, OK, most of it in January, March and December.
How hot does it get in Boise City?
July, with a typical high of 92° and a low of 63°. About 74 days a year reach 90° and 10 reach 100° (Boise City 2 E, OK).
When is the first and last frost in Boise City?
In half of years the last spring frost (32°) comes by April 26 and the first fall frost by October 17, about 173 frost-free days, at Boise City 2 E, OK.
What growing zone is Boise City 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 Boise City?
By one simple rule (highs of 62–84° and lows of 40° or more), May, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Boise City getting warmer?
Yes: 1991–2020 averaged 0.7° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 95% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Boise City.
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.