Photo: John Phelan · CC BY 3.0Few U.S. towns have cooler summers than Peru
Midwinter brings lows of about 12°. Precipitation peaks in September and eases off in February. Winter nights are cold: in January they are colder than in 91% of U.S. towns. Radiators earn their keep from October to April, the months that average under 50°.
A year in Peru at a glance
Each month’s typical high and low, and what it brings.
What stands out about Peru’s climate
Compared with towns across the U.S., with Peru’s place in Massachusetts beside it.
What a year in Peru feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 136 frost-free days a year
In half of years the last 32° night comes by May 17 and the first by October 1. Frost and day counts come from NOAA’s station at E Hawley, MA, 14 miles from the town’s center, 200 ft lower.
The 2023 USDA map puts Peru’s center in zone 5b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −11°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
About 77 inches of snow a winter
Snow, measured at Worthington, MA, is heaviest from January through February, about 19 inches a month. Precipitation (rain plus melted snow) adds up to 52 inches a year; September is the wettest month and February the driest. Rain or snow falls on about 158 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Peru
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 E Hawley, MA.
Living with Peru’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
136 frost-free days in zone 5b. The last frost comes by May 17 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 1.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 23 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Peru from natural hazards, river flooding is the largest share (67%); heat waves, cold waves, winter storms and ice storms together are 11%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Peru and its neighbors
Worthington the hottest July afternoons (80°, 2° warmer). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Peru’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 |
|---|---|---|---|---|
| Peru, MA | 12° | 78° | 52" | 77" |
| Freeport, ME | 14° | 78° | 49" | 84" |
| Busti, NY | 16° | 80° | 46" | 98" |
| Bradford, PA | 15° | 80° | 44" | 75" |
| Fairfax, VT | 9° | 80° | 43" | 80" |
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 Peru averaged 1.6° warmer than the 1900s. The biggest change is in December (+3.2°).
A bigger shift than in 66% 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 Peru compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Peru’s place among Massachusetts’.
Peru weather by month
Highs, lows and precipitation from NOAA’s grid at Peru’s center; snow, wet days and snow on the ground from Worthington, MA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 30° | 12° | 3.9" | 19.3" | 15 | 26 | 12° – 28° |
| February | 33° | 14° | 3.2" | 18.2" | 12 | 26 | 10° – 30° |
| March | 41° | 21° | 4.1" | 13.8" | 14 | 20 | 23° – 41° |
| April | 54° | 32° | 4.0" | 4.0" | 14 | 3 | 37° – 48° |
| May | 66° | 43° | 4.1" | 0.1" | 15 | 0 | 49° – 60° |
| June | 73° | 51° | 4.9" | 0.0" | 13 | 0 | 59° – 66° |
| July | 78° | 56° | 4.6" | 0.0" | 13 | 0 | 62° – 71° |
| August | 76° | 54° | 4.9" | 0.0" | 11 | 0 | 62° – 69° |
| September | 69° | 48° | 5.1" | 0.0" | 11 | 0 | 55° – 63° |
| October | 57° | 37° | 5.0" | 0.4" | 14 | 0 | 42° – 53° |
| November | 45° | 28° | 3.9" | 4.6" | 13 | 4 | 32° – 42° |
| December | 35° | 19° | 4.5" | 16.7" | 14 | 20 | 19° – 38° |
| Year | 55° | 35° | 52.2" | 77.1" | 158 | 98 |
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 30°. August is the most reliable, staying within 7°.
Where Peru’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 Peru’s center.
- Snow: Worthington, MA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: E Hawley, MA, 14 miles from the town’s center, 200 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 Peru’s climate
What is the weather like in Peru?
A typical July afternoon reaches 78°, a January night drops to 12°, and about 77 inches of snow falls in a normal winter. Colder January nights than 91% of U.S. towns; cooler July afternoons than 96% of U.S. towns.
How cold does it get in Peru in winter?
January nights average 12°. About 179 nights a year reach 32° or below and 11 reach 0° or below. In the coldest January of the last 30 years the month averaged 12°.
How much snow does Peru get?
About 77 inches in a normal winter at Worthington, MA, heaviest from January through February, about 19 inches a month, with snow on the ground about 98 days a year.
How hot does it get in Peru?
July, with a typical high of 78°. 90° days are rare: none in a normal year at E Hawley, MA.
When is the first and last frost in Peru?
In half of years the last spring frost (32°) comes by May 17 and the first fall frost by October 1, about 136 frost-free days, at E Hawley, MA.
What growing zone is Peru in?
Zone 5b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −11°.
What is the best time of year to visit Peru?
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 Peru getting warmer?
Yes: 1991–2020 averaged 1.6° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 66% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Peru.
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.