Updated October 2026
Purgatory Chasm State Reservation: Weather by Month and When to Go
Purgatory Chasm State Reservation is part of the Massachusetts state park system. Average highs range from 34°F in January to 83°F in July.
Average highs sit between 60°F and 80°F in May through June and September through October. They run above 80°F in July and August and below 60°F in November through April. The figures are NOAA climate normals for 1991–2020, measured at a weather station 9.9 miles from the park.
Warmest average high
83°F
July
Coldest average low
15°F
January and February
Most precipitation
4.8 in
October
Longest days
15.1 h
June
Purgatory Chasm State Reservation weather by month
| Month | Average high | Average low | Precipitation | Snowfall | Daylight |
|---|---|---|---|---|---|
| January | 34°F | 15°F | 3.8 in | 14.2 in | 9.3 h |
| February | 37°F | 15°F | 3.2 in | 12.6 in | 10.4 h |
| March | 45°F | 24°F | 4.4 in | 8.6 in | 11.7 h |
| April | 57°F | 34°F | 4.3 in | 2.6 in | 13.2 h |
| May | 69°F | 45°F | 3.6 in | 0.0 in | 14.4 h |
| June | 77°F | 55°F | 4.1 in | 0.0 in | 15.1 h |
| July | 83°F | 60°F | 3.9 in | 0.0 in | 14.8 h |
| August | 81°F | 59°F | 4.2 in | 0.0 in | 13.7 h |
| September | 74°F | 51°F | 4.1 in | 0.0 in | 12.3 h |
| October | 61°F | 39°F | 4.8 in | 0.1 in | 10.8 h |
| November | 50°F | 30°F | 3.9 in | 1.4 in | 9.6 h |
| December | 39°F | 21°F | 4.6 in | 7.1 in | 8.9 h |
Temperature, precipitation and snowfall figures are NOAA climate normals for 1991–2020 from station USC00190998, the nearest station with a complete set of temperature normals, 9.9 miles from the park. Conditions in the park can differ from the station's, most of all where the two sit at different elevations. Daylight is calculated for the park's latitude at the middle of each month.
What the averages show
- Temperature. July is the warmest month, with an average high of 83°F and an average low of 60°F. January and February are the coldest months, each with an average low of 15°F.
- Precipitation. October is the wettest month, averaging 4.8 inches of precipitation, and February is the driest, at 3.2 inches. An average year brings about 48.9 inches in total.
- Snowfall. The station averages 46.6 inches of snow a year, with the most in January (14.2 inches).
- Daylight. Days run from about 8.9 hours of daylight in December to 15.1 hours in June.
Camping, trails, maps and fees
Whether Purgatory Chasm State Reservation has camping or cabins, where its trails run, when it opens and what it charges are all published by the agency that runs the park. Its official page is the place to check before a trip.
Official Purgatory Chasm State Reservation page
For the forecast rather than the averages, the National Weather Service issues a point forecast for the park's location.
National Weather Service forecast for Purgatory Chasm State Reservation
Where to stay near Purgatory Chasm State Reservation
Hotels, cabins and vacation rentals near Purgatory Chasm State Reservation, with live availability and prices.
Top-rated places to stay near Purgatory Chasm State Reservation
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Frequently Asked Questions
July is the warmest month, with an average high of 83°F and an average low of 60°F. January and February are the coldest months, each with an average low of 15°F. These are NOAA 1991–2020 climate normals from a weather station 9.9 miles from the park.
Average highs sit between 60°F and 80°F in May through June and September through October. They run above 80°F in July and August and below 60°F in November through April.
October is the wettest month, averaging 4.8 inches of precipitation, and February is the driest, at 3.2 inches. An average year brings about 48.9 inches in total. Snowfall averages 46.6 inches a year, with the most in January.
Days run from about 8.9 hours of daylight in December to 15.1 hours in June. The hours are calculated for the park's latitude.
Nearest National Park Service sites
- Roger Williams National Memorial26 miles away
- Minute Man National Historical Park31 miles away
- Frederick Law Olmsted National Historic Site33 miles away
Nearby state parks
- Hopkinton State Park12 miles away
- Borderland State Park29 miles away
- Pilgrim Memorial State Park55 miles away
- Dinosaur State Park59 miles away · Connecticut
Distances are measured in a straight line from the park, so the drive is longer.
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020; USGS Protected Areas Database for location; the official Massachusetts state park listing for the park's name.