Harpers Ferry, IA
Climate overview — based on NOAA 1991-2020 normals from LYNXVILLE DAM 9, WI US.
Year-round temperatures (°F)
Climate summary
Harpers Ferry has an annual average temperature of 47.4°F with about 36.5 inches of precipitation per year and 35.5 inches of snow. The warmest month is July (average high 82.5°F), and the coldest is January (average low 9.6°F). June is typically the wettest month (5.50 in) and February the driest (1.18 in). Snow typically falls from November through April.
Best time to visit Harpers Ferry
Full guide →Climate change signal
All-time records →43 of 366 (11.7%) of Harpers Ferry's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1930s | 11 | |
| 1940s | 62 | |
| 1950s | 37 | |
| 1960s | 34 | |
| 1970s | 25 | |
| 1980s | 58 | |
| 1990s | 26 | |
| 2000s | 41 | |
| 2010s | 43 | |
| 2020s | 29 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 26.6°F | 9.6°F | 18.1°F | 1.29 in | 9.9 in | 9 |
| February | 31.4°F | 13.1°F | 22.2°F | 1.18 in | 10.0 in | 8 |
| March | 44.0°F | 25.3°F | 34.6°F | 2.03 in | 4.6 in | 9 |
| April | 58.3°F | 37.3°F | 47.8°F | 3.75 in | 0.6 in | 11 |
| May | 70.1°F | 48.7°F | 59.4°F | 4.68 in | — | 13 |
| June | 79.1°F | 58.7°F | 68.9°F | 5.50 in | — | 12 |
| July | 82.5°F | 63.1°F | 72.8°F | 4.47 in | — | 10 |
| August | 80.1°F | 61.3°F | 70.7°F | 3.82 in | — | 9 |
| September | 73.3°F | 53.3°F | 63.3°F | 3.79 in | — | 9 |
| October | 59.9°F | 41.1°F | 50.5°F | 2.53 in | 0.1 in | 9 |
| November | 44.4°F | 28.6°F | 36.5°F | 2.02 in | 1.7 in | 8 |
| December | 31.6°F | 17.0°F | 24.3°F | 1.45 in | 8.6 in | 9 |
Climate twins of Harpers Ferry
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).