Effigy Mounds National Monument in April
April at Effigy Mounds National Monument averages a daytime high near 59°F and an overnight low around 37°F, with about 4" of precipitation and roughly 1" of snow. Visitation runs about 0.6× the park's average month, which makes April a quiet month here.
- Average low
- 37°F
- Average high
- 59°F
Range across the year: 10°F to 83°F
- Precipitation
- 4.0 in
- Snowfall
- 1 in
- Daylight
- 13.2 hours
Roughly 5% of the park's yearly visitors come in April: roughly 2,800 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
That makes April the 9th-busiest of the park's twelve months, sitting between the July peak (2×) and the December low (0.4×).
On our Best Time to Visit score April rates 59/100 ("Fair"). Our recommended month is May: pleasant weather with noticeably thinner crowds (shoulder season).
The daily average of about 48°F is cool, so layers and a shorter daylight window matter. These figures are 1991–2020 NOAA climate normals from the nearest station, about 3.7 miles from the park.
Because June, July and August together draw about 42% of annual visitors, choosing April instead steps outside that summer crush — the single biggest lever on how crowded the park feels.
You'll have about 13.2 hours of daylight in April to explore — between the 8.8-hour midwinter low and the 15.2-hour summer high.
Park-wide, 2025 drew 56,912 recreation visits, down 8.2% from 61,975 in 2024.
Across the past decade overall visitation has risen about 7.1%, so a April visit is likely to feel busier than it did a few years ago.
How April compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| March | 45°F / 25°F | 0.7× Quiet | 38 Poor |
| April | 59°F / 37°F | 0.6× Quiet | 59 Fair |
| May | 70°F / 48°F | 1.1× Average | 63 Good |
All twelve months at Effigy Mounds, with the best time to visit.
Frequently Asked Questions
April averages a daytime high near 59°F and an overnight low around 37°F at Effigy Mounds National Monument, with about 4 inches of precipitation and roughly 1 inches of snow. These are 1991–2020 NOAA climate normals from the nearest station, about 3.7 miles from the park, so conditions inside the park can differ, especially at other elevations.
April is quiet at Effigy Mounds National Monument (about 0.6× the average month). Our best-time score rates it "Fair" at 59/100. Our recommended month is May.
The busiest month is July and the quietest is December. April sits at about 0.6× the park's average, or 5% of annual visitation.
A typical April sees about 3,000 recreation visits at Effigy Mounds National Monument, based on National Park Service monthly counts from 1979–2025.
Where to stay near Effigy Mounds in April
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Top-rated places to stay near Effigy Mounds
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See the full ranking of the best national parks to visit in April.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-10-11.