| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 41°F | 31°F | 4.0" |
| February | 21°F | 42°F | 31°F | 3.8" |
| March | 28°F | 50°F | 39°F | 5.0" |
| April | 39°F | 63°F | 50°F | 4.7" |
| May | 48°F | 71°F | 59°F | 3.7" |
| June | 58°F | 80°F | 68°F | 4.8" |
| July | 65°F | 86°F | 75°F | 4.0" |
| August | 63°F | 84°F | 73°F | 3.6" |
| September | 56°F | 78°F | 66°F | 4.3" |
| October | 46°F | 67°F | 56°F | 5.9" |
| November | 36°F | 56°F | 45°F | 4.4" |
| December | 27°F | 46°F | 36°F | 5.2" |
| Index | Hartford | Providence | Rhode Island |
| Air quality index | 44 | 44 | 45 |
| Pollution index | 8,312,000 | 8,312,000 | 3,440,259 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 289 |
| Days with moderate air quality | 74 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.090% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.210% |
| Mercury | 0.060% |
| City | Population | Air Quality Index | National Avg. |
| Attleboro, MA | 45,023 | 44 | 12.0% |
| Central Falls, RI | 19,437 | 44 | 12.0% |
| Harmony, RI | 1,195 | 44 | 12.0% |
| Valley Falls, RI | 11,548 | 44 | 12.0% |
| Clayville, RI | 81 | 44 | 12.0% |
| Providence, RI | 179,472 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Newport News, VA | 179,582 | 40 | 20.0% |
| Santa Rosa, CA | 178,391 | 34 | 32.0% |
| Ontario, CA | 178,194 | 89 | 78.0% |
| Rancho Cucamonga, CA | 178,060 | 89 | 78.0% |
| Sioux Falls, SD | 180,927 | 36 | 28.0% |
| Providence, RI | 179,472 | 44 | 12.0% |
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