| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 33°F | 24°F | 1.2" |
| February | 16°F | 33°F | 24°F | 2.1" |
| March | 24°F | 43°F | 33°F | 2.1" |
| April | 35°F | 58°F | 46°F | 2.6" |
| May | 46°F | 70°F | 58°F | 3.2" |
| June | 54°F | 77°F | 65°F | 5.0" |
| July | 59°F | 82°F | 70°F | 6.3" |
| August | 57°F | 79°F | 68°F | 6.1" |
| September | 51°F | 73°F | 61°F | 4.8" |
| October | 41°F | 61°F | 50°F | 4.3" |
| November | 31°F | 49°F | 39°F | 2.5" |
| December | 23°F | 38°F | 30°F | 1.9" |
| Index | Spencer | New York | National |
| Air quality index | 36 | 43 | 50 |
| Pollution index | 2,885,140 | 9,373,057 | 5,066,862 |
| Measurement | Total |
| Days measured | 352 |
| Days with good air quality | 314 |
| Days with moderate air quality | 38 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.005% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City, State | Population | Air Quality Index | National Avg. |
| Newfield Hamlet, NY | 759 | 34 | 32% |
| South Hill, NY | 6,577 | 34 | 32% |
| Odessa, NY | 636 | 34 | 32% |
| Candor, NY | 729 | 34 | 32% |
| East Ithaca, NY | 2,514 | 34 | 32% |
| Spencer, NY | 839 | 36 | 28% |
| City, State | Population | Air Quality Index | National Avg. |
| Norris, SC | 839 | 41 | 18% |
| Maxwell, IA | 839 | 37 | 26% |
| Hereford, PA | 839 | 42 | 16% |
| La Moille, IL | 839 | 0 | 100% |
| Rosiclare, IL | 839 | 44 | 12% |
| Spencer, NY | 839 | 36 | 28% |
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