Weather Reports for the county of Dewey in South Dakota
snow
rain
temp
wind
humidity| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| Average High (°F) | 30.0 | 30.7 | 47.6 | 59.1 | 70.0 | 82.9 |
| Average Low (°F) | 10.8 | 9.3 | 23.4 | 32.2 | 44.1 | 55.8 |
| All Time High (°F) | 70.0 | 73.0 | 87.8 | 91.0 | 93.0 | 104.0 |
| All Time Low (°F) | -29.9 | -29.0 | -23.1 | 0.0 | 19.0 | 37.0 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| Average High (°F) | 89.6 | 87.0 | 78.8 | 61.6 | 47.1 | 32.9 |
| Average Low (°F) | 61.7 | 59.0 | 50.3 | 37.0 | 23.9 | 13.3 |
| All Time High (°F) | 109.9 | 111.0 | 105.1 | 95.0 | 82.0 | 71.1 |
| All Time Low (°F) | 44.1 | 41.0 | 26.1 | -0.9 | -9.9 | -29.9 |
| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| Percent of Rainy Days | 0.0 | 0.0 | 0.0 | 0.1 | 0.2 | 0.2 |
| Avg. Rainfall (in) on Rainy Day | 0.0 | 0.1 | 0.1 | 0.3 | 0.3 | 0.3 |
| All Time Rainfall (in) on Rainy Day | 0.1 | 0.2 | 0.7 | 1.3 | 2.5 | 3.3 |
| 30 Day Rain Accumulation | 0.4 | 0.6 | 0.7 | 1.9 | 3.5 | 3.1 |
| All Time 30 Day Rain Accumulation | 1.2 | 1.9 | 1.6 | 4.8 | 9.4 | 8.5 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| Percent of Rainy Days | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | 0.0 |
| Avg. Rainfall (in) on Rainy Day | 0.3 | 0.3 | 0.2 | 0.3 | 0.1 | 0.1 |
| All Time Rainfall (in) on Rainy Day | 2.0 | 2.1 | 1.5 | 2.7 | 0.5 | 1.5 |
| 30 Day Rain Accumulation | 2.1 | 2.4 | 1.5 | 1.5 | 0.4 | 0.6 |
| All Time 30 Day Rain Accumulation | 5.3 | 5.8 | 4.8 | 5.8 | 1.1 | 2.3 |
| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| Percent of Days with Snowfall | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | 0.0 |
| Avg. Snowfall Depth (in) | 1.9 | 2.3 | 1.5 | 1.7 | 0.2 | 0.0 |
| 30 Day Snowfall Total (in) | 6.7 | 8.7 | 4.2 | 3.5 | 0.0 | 0.0 |
| All Time Snowfall Depth (in) | 38.8 | 20.5 | 11.4 | 15.6 | 1.1 | 0.0 |
| All Time 30 Day Snowfall Total (in) | 46.0 | 69.7 | 23.1 | 20.4 | 1.1 | 0.0 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| Percent of Days with Snowfall | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 |
| Avg. Snowfall Depth (in) | 0.0 | 0.0 | 0.0 | 1.3 | 1.3 | 2.3 |
| 30 Day Snowfall Total (in) | 0.0 | 0.0 | 0.0 | 1.0 | 2.4 | 8.2 |
| All Time Snowfall Depth (in) | 0.0 | 0.0 | 0.0 | 6.5 | 10.8 | 19.0 |
| All Time 30 Day Snowfall Total (in) | 0.0 | 0.0 | 0.0 | 12.1 | 15.8 | 36.3 |
Instead of using humidity directly we use dew point to measure what people commonly mean when saying it feels humid. Dew point is classified into 4 categories: Dry (under 25°F), Comfortable (25°F to 60°F), Muggy (60°F to 70°F) and Oppressive (70°F or greater). The table below shows the percentage of days with a dew point within a particular class.
| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| Dry | 83.3 | 83.9 | 46.5 | 27.1 | 3.5 | 0.0 |
| Comfortable | 16.7 | 16.1 | 53.5 | 72.9 | 94.2 | 80.4 |
| Muggy | 0.0 | 0.0 | 0.0 | 0.0 | 2.3 | 19.0 |
| Oppressive | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.7 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| Dry | 0.0 | 0.0 | 0.5 | 10.9 | 50.7 | 85.8 |
| Comfortable | 54.9 | 67.7 | 92.6 | 89.1 | 49.3 | 14.2 |
| Muggy | 43.3 | 32.2 | 6.9 | 0.0 | 0.0 | 0.0 |
| Oppressive | 1.8 | 0.2 | 0.1 | 0.0 | 0.0 | 0.0 |
The table below shows the distribution of average wind speeds in miles per hour for a given month or day. Wind speed may vary throughout a day and we show the average speed. Peak gusts or sustained maximum speeds may be significantly higher.
| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| 10th | 4.6 | 4.7 | 4.7 | 5.4 | 4.9 | 4.9 |
| 25th | 5.8 | 6.3 | 6.4 | 7.3 | 6.9 | 6.9 |
| 50th | 9.0 | 9.2 | 9.2 | 10.7 | 9.7 | 9.6 |
| 75th | 13.1 | 12.8 | 13.6 | 15.2 | 13.9 | 13.3 |
| 90th | 18.0 | 17.0 | 18.3 | 20.3 | 18.1 | 16.9 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| 10th | 4.9 | 4.7 | 4.7 | 4.7 | 4.7 | 4.6 |
| 25th | 6.9 | 6.9 | 6.7 | 6.7 | 5.8 | 5.8 |
| 50th | 9.4 | 9.2 | 9.5 | 9.4 | 8.5 | 8.6 |
| 75th | 12.8 | 12.4 | 13.2 | 13.5 | 12.3 | 12.3 |
| 90th | 16.1 | 15.6 | 17.0 | 18.3 | 16.9 | 16.5 |
The table below shows the distribution of wind direction (wind coming out of a particular direction) for a given month or day. Wind direction may vary throughout a day and the computation accounts for all measured changes in direction througout the day or month.
| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| North | 15.9 | 21.8 | 17.5 | 22.7 | 17.7 | 16.2 |
| NorthEast | 3.9 | 6.7 | 6.3 | 9.1 | 10.0 | 7.3 |
| East | 7.1 | 8.2 | 14.8 | 12.6 | 13.6 | 13.5 |
| SouthEast | 15.2 | 14.0 | 19.9 | 16.0 | 18.9 | 20.5 |
| South | 10.0 | 9.0 | 10.7 | 8.0 | 10.9 | 11.3 |
| SouthWest | 5.3 | 4.7 | 3.6 | 3.5 | 3.8 | 3.8 |
| West | 13.9 | 12.1 | 7.5 | 7.6 | 8.8 | 9.5 |
| NorthWest | 28.7 | 23.4 | 19.4 | 20.4 | 16.2 | 17.8 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| North | 15.0 | 14.0 | 15.2 | 14.7 | 15.1 | 18.2 |
| NorthEast | 9.6 | 9.1 | 9.1 | 6.0 | 4.7 | 5.2 |
| East | 16.1 | 17.5 | 13.5 | 8.8 | 7.2 | 9.2 |
| SouthEast | 25.4 | 23.9 | 21.0 | 16.4 | 14.6 | 13.1 |
| South | 15.5 | 14.8 | 14.2 | 11.2 | 12.4 | 10.4 |
| SouthWest | 3.6 | 3.2 | 3.6 | 4.7 | 5.9 | 6.0 |
| West | 5.1 | 6.0 | 7.2 | 12.4 | 13.5 | 13.9 |
| NorthWest | 9.6 | 11.3 | 16.0 | 25.7 | 26.6 | 23.9 |