| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 50°F | 35°F | 1.0" |
| February | 27°F | 54°F | 39°F | 1.6" |
| March | 38°F | 66°F | 51°F | 3.3" |
| April | 47°F | 74°F | 60°F | 5.1" |
| May | 56°F | 80°F | 67°F | 5.5" |
| June | 66°F | 90°F | 77°F | 5.8" |
| July | 69°F | 94°F | 81°F | 3.7" |
| August | 67°F | 93°F | 79°F | 3.8" |
| September | 59°F | 85°F | 71°F | 3.3" |
| October | 47°F | 75°F | 59°F | 3.8" |
| November | 36°F | 63°F | 48°F | 2.3" |
| December | 27°F | 50°F | 37°F | 1.8" |
| Index | Peru | Kansas | National |
| Air quality index | 40 | 47 | 42 |
| Pollution index | 121,713 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 292 |
| Days with moderate air quality | 72 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Havana, KS | 68 | 38 | 24.0% |
| Elk City, KS | 268 | 38 | 24.0% |
| Caney, KS | 1,659 | 38 | 24.0% |
| Tyro, KS | 181 | 38 | 24.0% |
| Niotaze, KS | 120 | 40 | 20.0% |
| Peru, KS | 163 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Oil Trough, AR | 163 | 45 | 10.0% |
| Antares, AZ | 163 | 13 | 74.0% |
| Sedgwick, CO | 163 | 19 | 62.0% |
| Maunie, IL | 163 | 45 | 10.0% |
| Lincolnville, KS | 163 | 22 | 56.0% |
| Peru, KS | 163 | 40 | 20.0% |
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