Facility · Iowa ·
Managed by the National Park Service
Effigy Mounds National Monument (National Monument) · Open Access

43.08881, -91.18553 · 43°5'19.7"N 91°11'7.9"W
Typically 83°F in Jul, down to 27°F in Jan.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 27 | 32 | 45 | 59 | 70 | 80 | 83 | 81 | 74 | 62 | 46 | 33 |
| Low °F | 10 | 13 | 25 | 37 | 48 | 59 | 63 | 61 | 52 | 40 | 28 | 17 |
| Precip 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 |
1991–2020 averages from the nearest NOAA station, 3.6 mi away — not measured at the facility itself, and elevation can make a real difference over that distance.
Recreation.gov last updated this record on 2026-07-09.
Facility information and photographs from Recreation.gov (RIDB). SpotOpened is not affiliated with Recreation.gov or any federal agency.
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