Updated October 2026
Gillette Castle State Park: Weather by Month and When to Go
Gillette Castle State Park is a state park in Connecticut. Average highs range from 38°F in January to 84°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 20 miles from the park.
Warmest average high
84°F
July
Coldest average low
21°F
January
Most precipitation
5.1 in
March
Longest days
15.0 h
June
Gillette Castle State Park weather by month
| Month | Average high | Average low | Precipitation | Snowfall | Daylight |
|---|---|---|---|---|---|
| January | 38°F | 21°F | 3.9 in | 9.0 in | 9.3 h |
| February | 41°F | 23°F | 3.8 in | 7.1 in | 10.4 h |
| March | 48°F | 29°F | 5.1 in | 5.0 in | 11.7 h |
| April | 59°F | 39°F | 4.7 in | 0.8 in | 13.1 h |
| May | 70°F | 49°F | 3.6 in | 0.0 in | 14.3 h |
| June | 78°F | 59°F | 4.3 in | 0.0 in | 15.0 h |
| July | 84°F | 65°F | 3.6 in | 0.0 in | 14.7 h |
| August | 83°F | 63°F | 4.4 in | 0.0 in | 13.7 h |
| September | 76°F | 55°F | 4.8 in | 0.0 in | 12.3 h |
| October | 64°F | 44°F | 4.9 in | 0.0 in | 10.9 h |
| November | 53°F | 34°F | 4.2 in | 0.3 in | 9.6 h |
| December | 43°F | 27°F | 5.0 in | 5.6 in | 9.0 h |
Temperature, precipitation and snowfall figures are NOAA climate normals for 1991–2020 from station USC00065910, the nearest station with a complete set of temperature normals, 20 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 84°F and an average low of 65°F. January is the coldest month, with an average low of 21°F and an average high of 38°F.
- Precipitation. March is the wettest month, averaging 5.1 inches of precipitation, and May and July are the driest, at 3.6 inches each. An average year brings about 52.3 inches in total.
- Snowfall. The station averages 27.8 inches of snow a year, with the most in January (9.0 inches).
- Daylight. Days run from about 9.0 hours of daylight in December to 15.0 hours in June.
Camping, trails, maps and fees
Whether Gillette Castle State Park 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 Gillette Castle State Park 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 Gillette Castle State Park
Where to stay near Gillette Castle State Park
Hotels, cabins and vacation rentals near Gillette Castle State Park, with live availability and prices.
Top-rated places to stay near Gillette Castle State Park
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Frequently Asked Questions
July is the warmest month, with an average high of 84°F and an average low of 65°F. January is the coldest month, with an average low of 21°F and an average high of 38°F. These are NOAA 1991–2020 climate normals from a weather station 20 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.
March is the wettest month, averaging 5.1 inches of precipitation, and May and July are the driest, at 3.6 inches each. An average year brings about 52.3 inches in total. Snowfall averages 27.8 inches a year, with the most in January.
Days run from about 9.0 hours of daylight in December to 15.0 hours in June. The hours are calculated for the park's latitude.
Nearest National Park Service sites
- Springfield Armory National Historic Site48 miles away
- Weir Farm National Historical Park54 miles away
- Fire Island National Seashore59 miles away
Nearby state parks
- Hammonasset Beach State Park12 miles away
- Rocky Neck State Park13 miles away
- Wadsworth Falls State Park15 miles away
- Harkness Memorial State Park18 miles away
Distances are measured in a straight line from the park, so the drive is longer.
Sources: NOAA NCEI U.S. Climate Normals 1991–2020; USGS Protected Areas Database for location; the official Connecticut state park listing for the park's name.