Best time to visit Effigy Mounds National Monument
October is the best balance at Effigy Mounds National Monument: mild and dry for the park (an average high of 62°F), with busy crowds. July is busiest, with about 10,000 visitors. November is the quietest, with highs near 46°F.
- Quiet
- Moderate
- Busy
- Very busy
- Few or no visits (may be closed)
- Best months
Month by month
- Station
- Prairie Du Chien, WI USC00476827
- Lat / lon
- 43.05, -91.14
- Elevation
- 658 ft
- From park center
- 4.6 mi
- Normals
- 1991–2020
- Visits
- 2023–2025
| Field | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Octbest | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High, °F | 27° | 32° | 45° | 59° | 70° | 80° | 83° | 81° | 74° | 62° | 46° | 33° | 58° |
| Low, °F | 10° | 13° | 25° | 37° | 48° | 59° | 63° | 61° | 52° | 40° | 28° | 17° | 38° |
| Precipitation, in | 1.2 | 1.3 | 2.0 | 4.0 | 4.7 | 5.8 | 4.1 | 4.2 | 4.0 | 2.7 | 2.1 | 1.6 | 37.7 |
| Snow, in | 9.0 | 8.6 | 4.3 | 1.4 | 0 | 0 | 0 | 0 | 0 | 0.2 | 1.5 | 8.8 | 33.8 |
| Daylight, h:mm | 9:19 | 10:27 | 11:47 | 13:20 | 14:38 | 15:21 | 15:04 | 13:56 | 12:26 | 10:57 | 9:39 | 9:01 | |
| Visitors, thousands | 2 | 3 | 3 | 3 | 5 | 8 | 10 | 8 | 7 | 7 | 2 | 2 | 60 |
| Crowds | Quiet | Quiet | Moderate | Quiet | Moderate | Busy | Very busy | Busy | Busy | Busy | Quiet | Quiet | |
| Weather | Cold | Cold | Cool | Mild, wet | Mild, wet | Mild, wet | Hot | Hot | Mild, wet | Mild | Cool | Cold |
| Month | High °F | Low °F | Precip., in | Snow, in | Daylight | Visitors | Crowds | Weather |
|---|---|---|---|---|---|---|---|---|
| January | 27° | 10° | 1.2 | 9.0 | 9:19 | 2,100 | Quiet | Cold |
| February | 32° | 13° | 1.3 | 8.6 | 10:27 | 2,800 | Quiet | Cold |
| March | 45° | 25° | 2.0 | 4.3 | 11:47 | 3,500 | Moderate | Cool |
| April | 59° | 37° | 4.0 | 1.4 | 13:20 | 2,500 | Quiet | Mild, wet |
| May | 70° | 48° | 4.7 | 0 | 14:38 | 5,300 | Moderate | Mild, wet |
| June | 80° | 59° | 5.8 | 0 | 15:21 | 7,900 | Busy | Mild, wet |
| July | 83° | 63° | 4.1 | 0 | 15:04 | 10,000 | Very busy | Hot |
| August | 81° | 61° | 4.2 | 0 | 13:56 | 8,100 | Busy | Hot |
| September | 74° | 52° | 4.0 | 0 | 12:26 | 6,700 | Busy | Mild, wet |
| Octoberbest | 62° | 40° | 2.7 | 0.2 | 10:57 | 6,700 | Busy | Mild |
| November | 46° | 28° | 2.1 | 1.5 | 9:39 | 2,200 | Quiet | Cool |
| December | 33° | 17° | 1.6 | 8.8 | 9:01 | 1,900 | Quiet | Cold |
| Year | 58° | 38° | 37.7 | 33.8 | 60,000 | |||
Year: average high and low, total precipitation and snowfall, total visitors. T = trace (under 0.05 in). – = not measured at this station. Updated .
- Hottest July, average high 83°F
- Coldest nights January, average low 10°F
- Source NOAA National Centers for Environmental Information; National Park Service
- Visitors a year about 60,000 (2023–2025 average)
- State Iowa
Closures, reservations and alerts: Effigy Mounds National Monument on nps.gov
Nearby
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