Photo: Jsayre64 · CC BY-SA 4.0Cambridge reaches 100° on about 15 days a year, more than 93% of U.S. towns
The coldest hours of a January night bottom out at 19° on average. The year swings widely: the coldest month’s nights and the warmest month’s afternoons are 74° apart. Its yearly precipitation falls short of 89% of U.S. towns. Garden planting can start around May 15; autumn frost returns near September 27.
A year in Cambridge at a glance
Each month’s typical high and low, and what it brings.
What stands out about Cambridge’s climate
Compared with towns across the U.S., with Cambridge’s place in Idaho beside it.
What a year in Cambridge feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 134 frost-free days a year
In half of years the last 32° night comes by May 15 and the first by September 27. Frost and day counts come from NOAA’s station at Cambridge, ID, 0.2 miles from the town’s center, at about the same height.
The 2023 USDA map puts Cambridge’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −9°. 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 20 inches of rain a year
December is the wettest month and August the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Cambridge
91% 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 Cambridge, ID.
Living with Cambridge’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
134 frost-free days in zone 6a. The last frost comes by May 15 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Sep 27.
Months with highs of 62–84° and lows of 40° or more: May, June and September.
Parks & trails →Of the yearly building losses FEMA expects in Cambridge from natural hazards, wildfire is the largest share (53%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Cambridge and similar climates
TownRatings has no climate map of the towns around Cambridge 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 Cambridge averaged 0.8° warmer than the 1900s. The biggest change is in January (+1.9°).
A smaller shift than in 89% 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 Cambridge compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Cambridge’s place among Idaho’s.
Cambridge weather by month
Highs, lows and precipitation from NOAA’s grid at Cambridge’s center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 34° | 19° | 3.0" | 18° – 33° |
| February | 41° | 22° | 2.1" | 25° – 41° |
| March | 53° | 30° | 2.1" | 35° – 49° |
| April | 62° | 35° | 1.5" | 43° – 54° |
| May | 72° | 43° | 1.7" | 52° – 63° |
| June | 81° | 49° | 1.2" | 61° – 74° |
| July | 93° | 57° | 0.4" | 64° – 82° |
| August | 91° | 54° | 0.3" | 66° – 76° |
| September | 80° | 45° | 0.6" | 59° – 68° |
| October | 64° | 35° | 1.2" | 42° – 56° |
| November | 47° | 27° | 2.3" | 29° – 42° |
| December | 36° | 20° | 3.7" | 20° – 35° |
| Year | 63° | 36° | 20.1" |
How much a month can swing
A normal is an average. July swings the most: from 1991 to 2020 its average ranged from 64° to 82°. September is the most reliable, staying within 9°.
Where Cambridge’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 Cambridge’s center.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Cambridge, ID, 0.2 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 Cambridge’s climate
What is the weather like in Cambridge?
A typical July afternoon reaches 93°, a January night drops to 19°. Colder January nights than 65% of U.S. towns; hotter July afternoons than 90% of U.S. towns.
How cold does it get in Cambridge in winter?
January nights average 19°. About 157 nights a year reach 32° or below and 7 reach 0° or below. In the coldest January of the last 30 years the month averaged 18°.
How hot does it get in Cambridge?
July, with a typical high of 93° and a low of 57°. About 62 days a year reach 90° and 15 reach 100° (Cambridge, ID).
When is the first and last frost in Cambridge?
In half of years the last spring frost (32°) comes by May 15 and the first fall frost by September 27, about 134 frost-free days, at Cambridge, ID.
What growing zone is Cambridge in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −9°.
What is the best time of year to visit Cambridge?
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 Cambridge getting warmer?
Yes: 1991–2020 averaged 0.8° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 89% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Cambridge.
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.