Caswell gets about 118 inches of snow a winter, more than all but 144 U.S. towns
A typical July afternoon reaches 76°, a January night drops to 2°, and about 118 inches of snow falls in a normal winter.
A year in Caswell at a glance
Each month’s typical high and low, and what it brings.
What stands out about Caswell’s climate
Compared with towns across the U.S., with Caswell’s place in Maine beside it.
What a year in Caswell feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 129 frost-free days a year
In half of years the last 32° night comes by May 16 and the first by September 24. Frost and day counts come from NOAA’s station at Limestone 4 Nnw, ME, 4 miles from the town’s center, at about the same height.
The 2023 USDA map puts Caswell’s center in zone 4a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −26°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
About 118 inches of snow a winter
Snow, measured at Caribou Muni Airport, falls mostly in January, February and December. Precipitation (rain plus melted snow) adds up to 43 inches a year; July is the wettest month and February the driest. Rain or snow falls on about 161 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Caswell
99% 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 Limestone 4 Nnw, ME.
Living with Caswell’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
129 frost-free days in zone 4a. The last frost comes by May 16 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 24.
Months with highs of 62–84° and lows of 40° or more: June, July, August and September. 34 miles of trails are waiting.
Parks & trails →Cold waves are 44% of the yearly building losses FEMA expects in Caswell from natural hazards, the largest share. Normals are averages; the hazards page covers the extremes.
Natural hazards →Caswell and its neighbors
Every town next door is within a degree of Caswell in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Caswell’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 |
|---|---|---|---|---|
| Caswell, ME | 2° | 76° | 43" | 118" |
| Harrietstown, NY | 5° | 75° | 46" | 104" |
| Morristown, VT | 7° | 78° | 43" | 139" |
| Sault Ste. Marie, MI | 8° | 76° | 37" | 120" |
| Berlin, NH | 5° | 77° | 45" | 82" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Caswell averaged 1.6° warmer than the 1900s. The biggest change is in December (+3.5°).
A bigger shift than in 64% 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 Caswell compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Caswell’s place among Maine’s.
Caswell weather by month
Highs, lows and precipitation from NOAA’s grid at Caswell’s center; snow, wet days and snow on the ground from Caribou Muni Airport. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 20° | 2° | 3.3" | 25.0" | 14 | 30 | −1° – 19° |
| February | 23° | 4° | 2.7" | 25.3" | 12 | 29 | 2° – 23° |
| March | 34° | 14° | 2.8" | 21.4" | 13 | 30 | 14° – 31° |
| April | 46° | 28° | 3.1" | 8.3" | 13 | 13 | 32° – 43° |
| May | 62° | 40° | 3.6" | 0.8" | 15 | 0 | 46° – 56° |
| June | 71° | 49° | 4.1" | 0.0" | 14 | 0 | 56° – 64° |
| July | 76° | 55° | 4.5" | 0.0" | 14 | 0 | 59° – 69° |
| August | 74° | 53° | 4.0" | 0.0" | 13 | 0 | 60° – 67° |
| September | 66° | 45° | 3.8" | 0.1" | 12 | 0 | 51° – 61° |
| October | 52° | 35° | 4.4" | 1.7" | 14 | 1 | 38° – 50° |
| November | 38° | 25° | 3.5" | 10.4" | 13 | 9 | 26° – 37° |
| December | 26° | 11° | 3.7" | 25.2" | 15 | 25 | 12° – 27° |
| Year | 49° | 30° | 43.4" | 118.2" | 161 | 136 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 2° to 23°. August is the most reliable, staying within 7°.
Where Caswell’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 Caswell’s center.
- Snow: Caribou Muni Airport.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Limestone 4 Nnw, ME, 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 Caswell’s climate
What is the weather like in Caswell?
A typical July afternoon reaches 76°, a January night drops to 2°, and about 118 inches of snow falls in a normal winter. Colder January nights than all but 81 U.S. towns; cooler July afternoons than 98% of U.S. towns.
How cold does it get in Caswell in winter?
January nights average 2°. About 190 nights a year reach 32° or below and 46 reach 0° or below. In the coldest January of the last 30 years the month averaged −1°.
How much snow does Caswell get?
About 118 inches in a normal winter at Caribou Muni Airport, most of it in January, February and December, with snow on the ground about 136 days a year.
How hot does it get in Caswell?
July, with a typical high of 76°. 90° days are rare: none in a normal year at Limestone 4 Nnw, ME.
When is the first and last frost in Caswell?
In half of years the last spring frost (32°) comes by May 16 and the first fall frost by September 24, about 129 frost-free days, at Limestone 4 Nnw, ME.
What growing zone is Caswell in?
Zone 4a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −26°.
What is the best time of year to visit Caswell?
By one simple rule (highs of 62–84° and lows of 40° or more), June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Caswell getting warmer?
Yes: 1991–2020 averaged 1.6° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 64% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Caswell.
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.