| Average climate data for Mount Rushmore National Memorial, United States | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Average maximum temperature (°F) | 36 | 37 | 43 | 51 | 61 | 71 | 79 | 78 | 68 | 55 | 43 | 35 | 79 |
| Average minimum temperature (°F) | 19 | 19 | 24 | 32 | 41 | 51 | 59 | 58 | 48 | 36 | 26 | 18 | 18 |
| Average precipitation (inch) | 0 | 1 | 1 | 2 | 4 | 3 | 3 | 2 | 2 | 2 | 1 | 0 | 22 |
| Average rainfall days (days) | 4 | 5 | 6 | 8 | 12 | 13 | 11 | 9 | 7 | 7 | 4 | 4 | 91 |
| Average snowfall (inch) | 6 | 8 | 10 | 11 | 1 | 0 | 0 | 0 | 1 | 4 | 6 | 6 | 52 |
| Average snowfall days (days) | 4 | 4 | 4 | 3 | 1 | 0 | 0 | 0 | 0 | 1 | 3 | 3 | 23 |
| Average daily daylight hours (h) | 9 | 10 | 12 | 13 | 14 | 15 | 15 | 13 | 12 | 11 | 9 | 9 | 12 |
The warmest month, with the highest average maximum temperature, is July (79.3 °F). The month with the lowest average maximum temperature is December (35.4 °F). Overall, the average maximum temperature over the whole year is 54.8 °F.
The month with the highest average minimum temperature is July (58.8 °F). The coldest month, with the lowest average minimum temperature, is December (18 °F). Overall, the average minimum temperature over the whole year is 36 °F.
The wettest month, with the highest amount of precipitation, is May (4.2 inch). The driest month, with the least amount of precipitation, is January (0.4 inch). Over the whole year there are 21.6 inch of rainfall on average.
The month with the most days of rain is June (12.6 days). The month with the fewest days of rain is December (4.1 days). Over the whole year there are 91.1 days of rain on average.
The month with the most snowfall is April (10.7 inch). The months with the least snowfall are July and August (0 inch). Over the whole year there are 52.3 inch of snowfall on average.
The month with the most days of snowfall is January (3.9 days). The months with the fewest days of snowfall are June and July (0 days). Over the whole year there are 23.1 days of snowfall on average.
The month with the longest days, so the most daylight, is June (Average daylight: 15 h). The month with the shortest days, so the least daylight, is December (Average daylight: 9 h). Over the whole year there are 11.9 h of daylight per day on average.
