Updated October 2026
Harkness Memorial State Park: Weather by Month and When to Go
Harkness Memorial State Park is a state park in Connecticut. Average highs range from 38°F in January to 80°F in July.
Average highs sit between 60°F and 80°F in May through October. They stay below 60°F in November through April. The figures are NOAA climate normals for 1991–2020, measured at a weather station 3.8 miles from the park.
Warmest average high
80°F
July
Coldest average low
23°F
January
Most precipitation
3.8 in
March and September
Longest days
15.0 h
June
Harkness Memorial State Park weather by month
| Month | Average high | Average low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 38°F | 23°F | 2.7 in | 9.3 h |
| February | 40°F | 25°F | 2.2 in | 10.4 h |
| March | 47°F | 31°F | 3.8 in | 11.7 h |
| April | 56°F | 39°F | 3.6 in | 13.1 h |
| May | 65°F | 49°F | 3.3 in | 14.3 h |
| June | 74°F | 58°F | 3.3 in | 15.0 h |
| July | 80°F | 65°F | 3.2 in | 14.7 h |
| August | 79°F | 64°F | 3.3 in | 13.7 h |
| September | 74°F | 57°F | 3.8 in | 12.3 h |
| October | 63°F | 46°F | 3.7 in | 10.9 h |
| November | 53°F | 37°F | 3.2 in | 9.6 h |
| December | 44°F | 29°F | 3.1 in | 9.0 h |
Temperature and precipitation figures are NOAA climate normals for 1991–2020 from station USW00014707, the nearest station with a complete set of temperature normals, 3.8 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 80°F and an average low of 65°F. January is the coldest month, with an average low of 23°F and an average high of 38°F.
- Precipitation. March and September are the wettest months, each averaging 3.8 inches of precipitation, and February is the driest, at 2.2 inches. An average year brings about 39.2 inches in total.
- Snowfall. The station has no snowfall normal, so snowfall is left out of the table. That is a gap in the station's record, not a sign that it never snows here.
- Daylight. Days run from about 9.0 hours of daylight in December to 15.0 hours in June.
Camping, trails, maps and fees
Whether Harkness Memorial 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 Harkness Memorial 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 Harkness Memorial State Park
Where to stay near Harkness Memorial State Park
Hotels, cabins and vacation rentals near Harkness Memorial State Park, with live availability and prices.
Top-rated places to stay near Harkness Memorial State Park
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Frequently Asked Questions
July is the warmest month, with an average high of 80°F and an average low of 65°F. January is the coldest month, with an average low of 23°F and an average high of 38°F. These are NOAA 1991–2020 climate normals from a weather station 3.8 miles from the park.
Average highs sit between 60°F and 80°F in May through October. They stay below 60°F in November through April.
March and September are the wettest months, each averaging 3.8 inches of precipitation, and February is the driest, at 2.2 inches. An average year brings about 39.2 inches in total. The station has no snowfall normal, so no snowfall figure is available.
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
- Roger Williams National Memorial51 miles away
- Springfield Armory National Historic Site61 miles away
- Fire Island National Seashore62 miles away
Nearby state parks
- Rocky Neck State Park7 miles away
- Gillette Castle State Park18 miles away
- Hammonasset Beach State Park23 miles away
- Wadsworth Falls State Park33 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.