| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -4°F | 16°F | 6°F | 11.4" |
| February | -4°F | 17°F | 6°F | 3.4" |
| March | 12°F | 31°F | 21°F | 2.2" |
| April | 27°F | 51°F | 38°F | 1.3" |
| May | 38°F | 65°F | 51°F | 2.8" |
| June | 50°F | 74°F | 61°F | 4.0" |
| July | 53°F | 78°F | 65°F | 2.5" |
| August | 51°F | 78°F | 63°F | 2.6" |
| September | 44°F | 71°F | 56°F | 3.1" |
| October | 31°F | 54°F | 41°F | 0.8" |
| November | 17°F | 36°F | 25°F | 1.2" |
| December | -1°F | 17°F | 8°F | 7.7" |
| Index | Rocklake | North Dakota | National |
| Air quality index | 36 | 35 | 42 |
| Pollution index | 408,578 | 1,038,665 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 320 |
| Days with moderate air quality | 45 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Calio, ND | 4 | 36 | 28.0% |
| Hansboro, ND | 21 | 36 | 28.0% |
| Calvin, ND | 11 | 36 | 28.0% |
| Sarles, ND | 9 | 36 | 28.0% |
| Egeland, ND | 34 | 36 | 28.0% |
| Rocklake, ND | 114 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Ridgeville, AL | 114 | 43 | 14.0% |
| Fulton, AR | 114 | 39 | 22.0% |
| Sweet Water Village, AZ | 114 | 74 | 48.0% |
| Keomah Village, IA | 114 | 35 | 30.0% |
| Donnellson, IL | 114 | 54 | 8.0% |
| Rocklake, ND | 114 | 36 | 28.0% |
Here are the best places to live in North Dakota
These are the 10 cheapest cities in North Dakota
See the best places to live in Rocklake
These are the largest cities in North Dakota