| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 38°F | 26°F | 0.3" |
| February | 19°F | 42°F | 29°F | 0.4" |
| March | 30°F | 57°F | 42°F | 1.2" |
| April | 40°F | 65°F | 51°F | 3.5" |
| May | 51°F | 75°F | 62°F | 4.7" |
| June | 62°F | 85°F | 73°F | 4.2" |
| July | 66°F | 89°F | 77°F | 3.8" |
| August | 63°F | 86°F | 74°F | 4.4" |
| September | 54°F | 80°F | 66°F | 1.9" |
| October | 42°F | 67°F | 53°F | 3.2" |
| November | 29°F | 54°F | 40°F | 0.7" |
| December | 18°F | 38°F | 27°F | 0.8" |
| Index | Harvard | Nebraska | National |
| Air quality index | 19 | 86 | 42 |
| Pollution index | 106,281 | 590,627 | 2,726,193 |
| Measurement | Total |
| Days measured | 97 |
| Days with good air quality | 92 |
| Days with moderate air quality | 5 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Stockham, NE | 20 | 19 | 62.0% |
| Clay Center, NE | 859 | 19 | 62.0% |
| Doniphan, NE | 1,010 | 19 | 62.0% |
| Trumbull, NE | 264 | 19 | 62.0% |
| Fairfield, NE | 414 | 19 | 62.0% |
| Harvard, NE | 1,184 | 19 | 62.0% |
| City | Population | Air Quality Index | National Avg. |
| Eclectic, AL | 1,184 | 52 | 4.0% |
| Fruitdale, CA | 1,184 | 43 | 14.0% |
| Gueydan, LA | 1,184 | 41 | 18.0% |
| Califon, NJ | 1,184 | 34 | 32.0% |
| Strodes Mills, PA | 1,184 | 44 | 12.0% |
| Harvard, NE | 1,184 | 19 | 62.0% |
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