The bar chart below shows the average monthly peak daytime temperatures at Mandan
		
		| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | -6.8 | -3.2 | 3.3 | 12.3 | 19.5 | 24.8 | 28.8 | 27.8 | 21.1 | 14.4 | 3.7 | -4.4 | 
| °F | 19.7 | 26.2 | 37.9 | 54.2 | 67.1 | 76.7 | 83.8 | 82 | 70 | 57.9 | 38.6 | 24 | 
Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.
The graph below shows the average rainfall and number of rainy days per month.
		
		| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mm | 10 | 9 | 16 | 38 | 59 | 81 | 63 | 49 | 37 | 25 | 13 | 9 | 
| inches | 0.4 | 0.3 | 0.6 | 1.5 | 2.3 | 3.2 | 2.5 | 1.9 | 1.5 | 1 | 0.5 | 0.4 | 
| Rainy days | 8 | 7 | 8 | 9 | 10 | 11 | 9 | 8 | 7 | 6 | 6 | 8 | 
Average annual rainfall in Mandan: 353.533mm (139.2 inches)
The bar chart below shows the average daily sunshine hours in Mandan
		| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hrs sunshine | 5.5 | 6.1 | 7.8 | 8.8 | 10.2 | 11.4 | 12.3 | 11 | 8.9 | 6.9 | 4.7 | 4.6 | 
The graph below shows the daily range of temperatures for each month.
		
		| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min °C | -18.5 | -14.7 | -8 | -0.7 | 5.8 | 11.1 | 13.9 | 12.5 | 6.4 | 0.4 | -7.8 | -15.7 | 
| Max °C | -6.6 | -3 | 3.6 | 12.7 | 19.9 | 25.2 | 29.2 | 28.2 | 21.5 | 14.8 | 4 | -4.2 | 
| Min °F | -1.2 | 5.6 | 17.7 | 30.8 | 42.4 | 51.9 | 56.9 | 54.4 | 43.4 | 32.8 | 18.1 | 3.8 | 
| Max °F | 9.5 | 16.2 | 28 | 42.8 | 55 | 64.6 | 70.7 | 68.5 | 57 | 45.7 | 28.6 | 14.2 | 
The graph below shows the average sea temperature.
		
		| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 6.6 | 6.4 | 6.7 | 7.5 | 8.7 | 10.7 | 13.2 | 15.9 | 14.9 | 11.8 | 9.1 | 7.3 | 
| °F | 43.9 | 43.6 | 44.1 | 45.5 | 47.7 | 51.2 | 55.7 | 60.5 | 58.7 | 53.2 | 48.3 | 45.2 | 
The graph below shows the average wind speed.
		
		| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| km/h | 17 | 17 | 18 | 20 | 19 | 17 | 16 | 16 | 17 | 17 | 16 | 16 | 
| mph | 11 | 11 | 11 | 12 | 12 | 11 | 10 | 10 | 10 | 11 | 10 | 10 | 
A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.
The graph below shows the average relative humidity.
		| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | 
|---|---|---|---|---|---|---|---|---|---|---|---|
| 71% | 72% | 70% | 62% | 60% | 65% | 62% | 61% | 64% | 64% | 72% | 75% | 
| Hottest month: | July | 28.8°C 83.8°F | 
|---|---|---|
| Driest month: | February | 9mm 0.4ins | 
| Sunniest month: | July | 12.3hrs | 
| Coldest month: | January | -6.8°C 19.8°F | 
| Wettest month: | June | 81mm 3.2ins | 
| Warmest sea: | August | 15.9°C 60.6°F |