Photo: Jon Platek · CC BY-SA 3.0Nights turn raw in Rochester each January, colder than in 89% of U.S. towns
High summer brings afternoon highs near 82°. Only 69° separates winter nights from summer afternoons. Summers stay cool: July afternoons here are cooler than in 81% of U.S. towns. Plan time outside from May to September, when highs sit at 68–82°.
A year in Rochester at a glance
Each month’s typical high and low, and what it brings.
What stands out about Rochester’s climate
Compared with towns across the U.S., with Rochester’s place in New Hampshire beside it.
What a year in Rochester feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 161 frost-free days a year
In half of years the last 32° night comes by April 30 and the first by October 9. Frost and day counts come from NOAA’s station at Rochester Skyhaven Airport, 3 miles from the town’s center, at about the same height.
The 2023 USDA map puts Rochester’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 39 inches of snow a winter
Snow, measured at Durham, NH, falls mostly in January. 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 121 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Rochester
93% 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 Rochester Skyhaven Airport.
Living with Rochester’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
161 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 9.
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 Rochester from natural hazards, river flooding is the largest share (72%); heat waves, cold waves, winter storms and ice storms together are 8%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Rochester and its neighbors
Every town next door is within a degree of Rochester in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Rochester’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 |
|---|---|---|---|---|
| Rochester, NH | 13° | 82° | 47" | 39" |
| Mount Hope, NY | 17° | 82° | 47" | 43" |
| Carbondale, PA | 16° | 81° | 46" | 47" |
| Watertown, CT | 17° | 83° | 51" | 47" |
| Newton, NJ | 18° | 83° | 47" | 39" |
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 Rochester averaged 1.6° warmer than the 1900s. The biggest change is in December (+3.2°).
A bigger shift than in 68% 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 Rochester compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Rochester’s place among New Hampshire’s.
Rochester weather by month
Highs, lows and precipitation from NOAA’s grid at Rochester’s center; snow, wet days and snow on the ground from Durham, NH. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 32° | 13° | 3.2" | 10.8" | 9 | 19 | 14° – 30° |
| February | 35° | 14° | 3.2" | 9.1" | 8 | 18 | 10° – 31° |
| March | 44° | 23° | 4.0" | 6.8" | 9 | 14 | 26° – 42° |
| April | 57° | 33° | 4.2" | 1.8" | 11 | 1 | 40° – 49° |
| May | 68° | 44° | 3.7" | 0.0" | 12 | 0 | 50° – 61° |
| June | 77° | 53° | 4.3" | 0.0" | 12 | 0 | 62° – 69° |
| July | 82° | 59° | 4.0" | 0.0" | 11 | 0 | 66° – 74° |
| August | 81° | 57° | 3.7" | 0.0" | 10 | 0 | 66° – 72° |
| September | 73° | 50° | 3.9" | 0.0" | 10 | 0 | 57° – 65° |
| October | 60° | 38° | 4.8" | 0.2" | 10 | 0 | 46° – 56° |
| November | 48° | 29° | 4.0" | 1.3" | 11 | 1 | 34° – 43° |
| December | 37° | 20° | 4.2" | 8.9" | 11 | 11 | 23° – 37° |
| Year | 58° | 36° | 47.2" | 38.9" | 121 | 64 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 10° to 31°. August is the most reliable, staying within 6°.
Where Rochester’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 Rochester’s center.
- Snow: Durham, NH.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Rochester Skyhaven Airport, 3 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 Rochester’s climate
What is the weather like in Rochester?
A typical July afternoon reaches 82°, a January night drops to 13°, and about 39 inches of snow falls in a normal winter. Colder January nights than 89% of U.S. towns; cooler July afternoons than 81% of U.S. towns.
How cold does it get in Rochester in winter?
January nights average 13°. About 145 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 14°.
How much snow does Rochester get?
About 39 inches in a normal winter at Durham, NH, most of it in January, with snow on the ground about 64 days a year.
How hot does it get in Rochester?
July, with a typical high of 82° and a low of 59°. About 11 days a year reach 90° (Rochester Skyhaven Airport).
When is the first and last frost in Rochester?
In half of years the last spring frost (32°) comes by April 30 and the first fall frost by October 9, about 161 frost-free days, at Rochester Skyhaven Airport.
What growing zone is Rochester 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 Rochester?
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 Rochester getting warmer?
Yes: 1991–2020 averaged 1.6° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 68% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Rochester.
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.