Photo: P199 · CC BY-SA 3.0Errol gets about 112 inches of snow a winter, more than 98% of U.S. towns
High summer brings afternoon highs near 78°. In July, afternoons here are cooler than in 96% of U.S. towns. Since 1901–2000, the year has warmed by 1.8°, most of all in December. Garden planting can start around May 21; autumn frost returns near September 22.
A year in Errol at a glance
Each month’s typical high and low, and what it brings.
What stands out about Errol’s climate
Compared with towns across the U.S., with Errol’s place in New Hampshire beside it.
What a year in Errol feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 123 frost-free days a year
In half of years the last 32° night comes by May 21 and the first by September 22. Frost and day counts come from NOAA’s station at Errol Airport, 4 miles from the town’s center, 120 ft lower.
The 2023 USDA map puts Errol’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°
90° days by month
Average days at 90° or more
About 112 inches of snow a winter
Snow, measured at Andover 2, ME, falls mostly in February and December. Precipitation (rain plus melted snow) adds up to 42 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 141 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Errol
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 Errol Airport.
Living with Errol’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
123 frost-free days in zone 4a. The last frost comes by May 21 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 22.
Months with highs of 62–84° and lows of 40° or more: June, July, August and September. 66 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Errol from natural hazards, avalanches are the largest share (73%); heat waves, cold waves, winter storms and ice storms together are 6%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Errol and similar climates
TownRatings has no climate map of the towns around Errol yet.
Climates most like Errol’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 |
|---|---|---|---|---|
| Errol, NH | 4° | 78° | 42" | 112" |
| Tupper Lake, NY | 5° | 78° | 43" | 105" |
| Caribou, ME | 2° | 77° | 41" | 118" |
| Sault Ste. Marie, MI | 8° | 76° | 37" | 120" |
| Minocqua, WI | 3° | 77° | 33" | 99" |
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 Errol averaged 1.8° warmer than the 1900s. The biggest change is in December (+4.5°).
A bigger shift than in 81% 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 Errol compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Errol’s place among New Hampshire’s.
Errol weather by month
Highs, lows and precipitation from NOAA’s grid at Errol’s center; snow, wet days and snow on the ground from Andover 2, ME. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 25° | 4° | 2.9" | 22.5" | 11 | 30 | 3° – 23° |
| February | 29° | 5° | 2.4" | 26.5" | 9 | 28 | 3° – 23° |
| March | 37° | 15° | 2.8" | 17.6" | 9 | 28 | 16° – 34° |
| April | 51° | 27° | 3.3" | 7.0" | 11 | 13 | 35° – 44° |
| May | 64° | 38° | 3.7" | 0.2" | 14 | 0 | 45° – 57° |
| June | 73° | 48° | 4.4" | 0.0" | 15 | 0 | 58° – 65° |
| July | 78° | 53° | 4.2" | 0.0" | 12 | 0 | 61° – 69° |
| August | 76° | 52° | 4.0" | 0.0" | 12 | 0 | 61° – 67° |
| September | 69° | 44° | 3.5" | 0.0" | 9 | 0 | 51° – 61° |
| October | 55° | 34° | 4.3" | 0.6" | 13 | 0 | 40° – 52° |
| November | 42° | 25° | 3.2" | 8.3" | 11 | 8 | 28° – 39° |
| December | 31° | 13° | 3.5" | 29.1" | 14 | 25 | 15° – 33° |
| Year | 52° | 30° | 42.0" | 111.8" | 141 | 133 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 3° to 23°. August is the most reliable, staying within 6°.
Where Errol’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 Errol’s center.
- Snow: Andover 2, ME.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Errol Airport, 4 miles from the town’s center, 120 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 Errol’s climate
What is the weather like in Errol?
A typical July afternoon reaches 78°, a January night drops to 4°, and about 112 inches of snow falls in a normal winter. Colder January nights than all but 156 U.S. towns; cooler July afternoons than 96% of U.S. towns.
How cold does it get in Errol in winter?
January nights average 4°. About 197 nights a year reach 32° or below and 49 reach 0° or below. In the coldest January of the last 30 years the month averaged 3°.
How much snow does Errol get?
About 112 inches in a normal winter at Andover 2, ME, most of it in February and December, with snow on the ground about 133 days a year.
How hot does it get in Errol?
July, with a typical high of 78° and a low of 53°. About 1 days a year reach 90° (Errol Airport).
When is the first and last frost in Errol?
In half of years the last spring frost (32°) comes by May 21 and the first fall frost by September 22, about 123 frost-free days, at Errol Airport.
What growing zone is Errol 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 Errol?
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 Errol getting warmer?
Yes: 1991–2020 averaged 1.8° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 81% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Errol.
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.