Updated October 2026
Hopatcong State Park: Weather by Month and When to Go
Hopatcong State Park is a state park in New Jersey. Average highs range from 36°F in January to 84°F in July.
Average highs sit between 60°F and 80°F in April through June and September through October. They run above 80°F in July and August and below 60°F in November through March. The figures are NOAA climate normals for 1991–2020, measured at a weather station 6.2 miles from the park.
Warmest average high
84°F
July
Coldest average low
19°F
January
Most precipitation
5.1 in
July
Longest days
14.9 h
June
Hopatcong State Park weather by month
| Month | Average high | Average low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 36°F | 19°F | 3.3 in | 9.4 h |
| February | 39°F | 20°F | 2.8 in | 10.4 h |
| March | 48°F | 28°F | 4.1 in | 11.7 h |
| April | 61°F | 38°F | 3.8 in | 13.1 h |
| May | 71°F | 48°F | 3.8 in | 14.3 h |
| June | 79°F | 57°F | 4.5 in | 14.9 h |
| July | 84°F | 62°F | 5.1 in | 14.7 h |
| August | 82°F | 60°F | 4.9 in | 13.6 h |
| September | 74°F | 52°F | 4.3 in | 12.3 h |
| October | 63°F | 42°F | 4.6 in | 10.9 h |
| November | 52°F | 32°F | 3.4 in | 9.7 h |
| December | 41°F | 25°F | 4.2 in | 9.1 h |
Temperature and precipitation figures are NOAA climate normals for 1991–2020 from station USW00054779, the nearest station with a complete set of temperature normals, 6.2 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 62°F. January is the coldest month, with an average low of 19°F and an average high of 36°F.
- Precipitation. July is the wettest month, averaging 5.1 inches of precipitation, and February is the driest, at 2.8 inches. An average year brings about 48.8 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 9.1 hours of daylight in December to 14.9 hours in June.
Camping, trails, maps and fees
Whether Hopatcong 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 park directory is the place to start.
Official New Jersey state park directory
For the forecast rather than the averages, the National Weather Service issues a point forecast for the park's location.
Where to stay near Hopatcong State Park
Hotels, cabins and vacation rentals near Hopatcong State Park, with live availability and prices.
Top-rated places to stay near Hopatcong 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 62°F. January is the coldest month, with an average low of 19°F and an average high of 36°F. These are NOAA 1991–2020 climate normals from a weather station 6.2 miles from the park.
Average highs sit between 60°F and 80°F in April through June and September through October. They run above 80°F in July and August and below 60°F in November through March.
July is the wettest month, averaging 5.1 inches of precipitation, and February is the driest, at 2.8 inches. An average year brings about 48.8 inches in total. The station has no snowfall normal, so no snowfall figure is available.
Days run from about 9.1 hours of daylight in December to 14.9 hours in June. The hours are calculated for the park's latitude.
Nearest National Park Service sites
- Morristown National Historical Park14 miles away
- Delaware Water Gap National Recreation Area19 miles away
- Thomas Edison National Historical Park25 miles away
Nearby state parks
- Hacklebarney State Park13 miles away
- Wawayanda State Park22 miles away
- Liberty State Park37 miles away
- Harriman State Park37 miles away · New York
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 New Jersey state park listing for the park's name.