Photo: Jmaxx37 · CC BY-SA 4.0Hagerman reaches 100° on about 15 days a year, more than 93% of U.S. towns
The depth of winter brings overnight lows near 22°. By precipitation alone, it ranks drier than 98% of U.S. towns. January has warmed most since 1901–2000, part of a 1.3° rise. Homes need heating from November to April, the months averaging under 50°.
A year in Hagerman at a glance
Each month’s typical high and low, and what it brings.
What stands out about Hagerman’s climate
Compared with towns across the U.S., with Hagerman’s place in Idaho beside it.
What a year in Hagerman feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 151 frost-free days a year
In half of years the last 32° night comes by May 3 and the first by October 1. Frost and day counts come from NOAA’s station at Hagerman 2 Sw, ID, 1.4 miles from the town’s center, at about the same height.
The 2023 USDA map puts Hagerman’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 9 inches of rain a year
December is the wettest month and July the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Hagerman
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 Hagerman 2 Sw, ID.
Living with Hagerman’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
151 frost-free days in zone 7a. The last frost comes by May 3 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 1.
Months with highs of 62–84° and lows of 40° or more: May, June and September. 0.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Hagerman from natural hazards, wildfire is the largest share (35%); heat waves, cold waves, winter storms and ice storms together are 19%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Hagerman and similar climates
TownRatings has no climate map of the towns around Hagerman yet.
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 Hagerman averaged 1.3° warmer than the 1900s. The biggest change is in January (+3.0°).
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 Hagerman compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Hagerman’s place among Idaho’s.
Hagerman weather by month
Highs, lows and precipitation from NOAA’s grid at Hagerman’s center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 39° | 22° | 1.2" | 21° – 38° |
| February | 46° | 25° | 0.7" | 27° – 43° |
| March | 57° | 31° | 0.9" | 39° – 49° |
| April | 64° | 36° | 0.8" | 45° – 55° |
| May | 74° | 43° | 0.9" | 53° – 64° |
| June | 84° | 51° | 0.5" | 62° – 75° |
| July | 94° | 57° | 0.1" | 66° – 81° |
| August | 92° | 55° | 0.1" | 68° – 76° |
| September | 81° | 46° | 0.3" | 60° – 68° |
| October | 67° | 36° | 0.7" | 43° – 58° |
| November | 50° | 28° | 1.0" | 32° – 45° |
| December | 39° | 22° | 1.5" | 25° – 36° |
| Year | 65° | 38° | 8.9" |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 21° to 38°. August is the most reliable, staying within 8°.
Where Hagerman’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 Hagerman’s center.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Hagerman 2 Sw, ID, 1.4 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 Hagerman’s climate
What is the weather like in Hagerman?
A typical July afternoon reaches 94°, a January night drops to 22°. Milder January nights than 53% of U.S. towns; hotter July afternoons than 93% of U.S. towns.
How cold does it get in Hagerman in winter?
December nights average 22°. About 142 nights a year reach 32° or below and 1 reach 0° or below. In the coldest December of the last 30 years the month averaged 25°.
How hot does it get in Hagerman?
July, with a typical high of 94° and a low of 57°. About 69 days a year reach 90° and 15 reach 100° (Hagerman 2 Sw, ID).
When is the first and last frost in Hagerman?
In half of years the last spring frost (32°) comes by May 3 and the first fall frost by October 1, about 151 frost-free days, at Hagerman 2 Sw, ID.
What growing zone is Hagerman 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 Hagerman?
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 Hagerman 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 Hagerman.
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.