Photo: Jon Platek · CC BY-SA 3.0Nashua has colder winter nights than 82% of U.S. towns
Midsummer highs settle at about 84°. The wettest month is October; the driest is February. Its yearly precipitation tops that of 68% of U.S. towns. For walks and days out, the stretch from May to September brings highs of 70–84°.
A year in Nashua at a glance
Each month’s typical high and low, and what it brings.
What stands out about Nashua’s climate
Compared with towns across the U.S., with Nashua’s place in New Hampshire beside it.
What a year in Nashua feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 165 frost-free days a year
In half of years the last 32° night comes by April 30 and the first by October 12. Frost and day counts come from NOAA’s station at Nashua 2 Nnw, NH, 3 miles from the city’s center point, at about the same height.
The 2023 USDA map puts Nashua’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −7°. 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 53 inches of snow a winter
Snow, measured at Nashua 2 Nnw, NH, is heaviest from January through February, about 15 inches a month. Precipitation (rain plus melted snow) adds up to 47 inches a year; October is the wettest month and February the driest. Rain or snow falls on about 120 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Nashua
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 Nashua 2 Nnw, NH.
Living with Nashua’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
165 frost-free days in zone 6a. The last frost comes by Apr 30 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 12.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 46 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Nashua from natural hazards, river flooding is the largest share (60%); heat waves, cold waves, winter storms and ice storms together are 7%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Nashua and its neighbors
Merrimack has the coldest January nights next door (15°, 1° colder). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Nashua’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 |
|---|---|---|---|---|
| Nashua, NH | 16° | 84° | 47" | 53" |
| Shawangunk, NY | 17° | 84° | 48" | 59" |
| Franklin, PA | 19° | 83° | 45" | 54" |
| Newton, NJ | 18° | 83° | 47" | 39" |
| Ontario, OH | 17° | 82° | 42" | 49" |
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 Nashua averaged 1.7° warmer than the 1900s. The biggest change is in December (+3.4°).
A bigger shift than in 73% 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 Nashua compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Nashua’s place among New Hampshire’s.
Nashua weather by month
Highs, lows and precipitation from NOAA’s grid at Nashua’s center; snow, wet days and snow on the ground from Nashua 2 Nnw, NH. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 34° | 16° | 3.3" | 14.7" | 9 | 15° – 32° |
| February | 37° | 17° | 3.2" | 14.5" | 8 | 14° – 34° |
| March | 46° | 25° | 4.1" | 10.1" | 9 | 28° – 44° |
| April | 59° | 35° | 4.0" | 0.7" | 11 | 43° – 51° |
| May | 70° | 46° | 3.8" | 0.0" | 12 | 52° – 63° |
| June | 79° | 55° | 4.1" | 0.0" | 11 | 63° – 70° |
| July | 84° | 61° | 3.7" | 0.0" | 10 | 68° – 76° |
| August | 82° | 59° | 3.8" | 0.0" | 9 | 68° – 74° |
| September | 74° | 51° | 3.9" | 0.0" | 9 | 59° – 67° |
| October | 62° | 39° | 4.7" | 0.0" | 11 | 47° – 58° |
| November | 50° | 31° | 3.8" | 1.7" | 10 | 36° – 45° |
| December | 40° | 22° | 4.4" | 11.2" | 10 | 25° – 40° |
| Year | 60° | 38° | 46.7" | 52.9" | 120 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 14° to 34°. August is the most reliable, staying within 6°.
Where Nashua’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 Nashua’s center.
- Snow: Nashua 2 Nnw, NH.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Nashua 2 Nnw, NH, 3 miles from the city’s center point, 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 Nashua’s climate
What is the weather like in Nashua?
A typical July afternoon reaches 84°, a January night drops to 16°, and about 53 inches of snow falls in a normal winter. Colder January nights than 82% of U.S. towns; cooler July afternoons than 61% of U.S. towns.
How cold does it get in Nashua in winter?
January nights average 16°. About 155 nights a year reach 32° or below and 8 reach 0° or below. In the coldest January of the last 30 years the month averaged 15°.
How much snow does Nashua get?
About 53 inches in a normal winter at Nashua 2 Nnw, NH, heaviest from January through February, about 15 inches a month.
How hot does it get in Nashua?
July, with a typical high of 84° and a low of 61°. About 15 days a year reach 90° (Nashua 2 Nnw, NH).
When is the first and last frost in Nashua?
In half of years the last spring frost (32°) comes by April 30 and the first fall frost by October 12, about 165 frost-free days, at Nashua 2 Nnw, NH.
What growing zone is Nashua in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −7°.
What is the best time of year to visit Nashua?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Nashua getting warmer?
Yes: 1991–2020 averaged 1.7° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 73% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Nashua.
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.