Updated October 2026
Matthiessen State Park: Weather by Month and When to Go
Matthiessen State Park is a state park in Illinois. The USGS Protected Areas Database maps about 1,900 acres under its name. Average highs range from 30°F in January to 84°F in July.
Average highs sit between 60°F and 80°F in April through May and September through October. They run above 80°F in June through 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
14°F
January
Most precipitation
4.6 in
June
Longest days
15.0 h
June
Matthiessen State Park weather by month
| Month | Average high | Average low | Precipitation | Snowfall | Daylight |
|---|---|---|---|---|---|
| January | 30°F | 14°F | 1.8 in | 8.6 in | 9.3 h |
| February | 35°F | 18°F | 1.8 in | 5.5 in | 10.4 h |
| March | 48°F | 27°F | 2.3 in | 4.0 in | 11.7 h |
| April | 61°F | 38°F | 3.8 in | 0.6 in | 13.1 h |
| May | 73°F | 49°F | 4.5 in | 0.0 in | 14.3 h |
| June | 81°F | 59°F | 4.6 in | 0.0 in | 15.0 h |
| July | 84°F | 63°F | 3.9 in | 0.0 in | 14.7 h |
| August | 82°F | 61°F | 3.7 in | 0.0 in | 13.7 h |
| September | 77°F | 53°F | 3.4 in | 0.0 in | 12.3 h |
| October | 64°F | 41°F | 3.5 in | 0.2 in | 10.9 h |
| November | 48°F | 30°F | 2.7 in | 0.9 in | 9.6 h |
| December | 36°F | 20°F | 2.1 in | 8.7 in | 9.0 h |
Temperature, precipitation and snowfall figures are NOAA climate normals for 1991–2020 from station USC00116753, 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. The acreage is what the USGS Protected Areas Database maps under the park's name. The state's own figure can differ, because the database may hold part of a park under another name.
What the averages show
- Temperature. July is the warmest month, with an average high of 84°F and an average low of 63°F. January is the coldest month, with an average low of 14°F and an average high of 30°F.
- Precipitation. June is the wettest month, averaging 4.6 inches of precipitation, and January and February are the driest, at 1.8 inches each. An average year brings about 38.1 inches in total.
- Snowfall. The station averages 28.5 inches of snow a year, with the most in December (8.7 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 Matthiessen 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 Matthiessen 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 Matthiessen State Park
Where to stay near Matthiessen State Park
Hotels, cabins and vacation rentals near Matthiessen State Park, with live availability and prices.
Top-rated places to stay near Matthiessen 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 63°F. January is the coldest month, with an average low of 14°F and an average high of 30°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 May and September through October. They run above 80°F in June through August and below 60°F in November through March.
June is the wettest month, averaging 4.6 inches of precipitation, and January and February are the driest, at 1.8 inches each. An average year brings about 38.1 inches in total. Snowfall averages 28.5 inches a year, with the most in December.
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
- Pullman National Historical Park79 miles away
- Indiana Dunes National Park103 miles away
- Lincoln Home National Historic Site108 miles away
Nearby state parks
- Rock Cut State Park74 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 and acreage; the official Illinois state park listing for the park's name.