| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 55°F | 44°F | 5.4" |
| February | 41°F | 63°F | 51°F | 4.0" |
| March | 44°F | 72°F | 56°F | 2.7" |
| April | 44°F | 75°F | 59°F | 1.8" |
| May | 51°F | 85°F | 68°F | 4.4" |
| June | 56°F | 91°F | 73°F | 0.0" |
| July | 62°F | 99°F | 81°F | 0.0" |
| August | 61°F | 99°F | 79°F | 0.3" |
| September | 54°F | 88°F | 70°F | 1.1" |
| October | 48°F | 80°F | 62°F | 1.1" |
| November | 42°F | 70°F | 54°F | 0.3" |
| December | 39°F | 56°F | 47°F | 3.7" |
| Index | Tranquillity | California | National |
| Air quality index | 50 | 55 | 42 |
| Pollution index | 3,767,190 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 189 |
| Days with moderate air quality | 163 |
| Days w/ poor A.Q. for sensitive groups | 13 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.250% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.050% |
| Mercury | 0.060% |
| City | Population | Air Quality Index | National Avg. |
| Mendota, CA | 12,173 | 50 | = 100 |
| Cantua Creek, CA | 376 | 50 | = 100 |
| Biola, CA | 1,440 | 50 | = 100 |
| Firebaugh, CA | 7,772 | 50 | = 100 |
| Three Rocks, CA | 97 | 50 | = 100 |
| Tranquillity, CA | 807 | 50 | = 100 |
| City | Population | Air Quality Index | National Avg. |
| Knik River, AK | 807 | 31 | 38.0% |
| Earlville, IA | 807 | 39 | 22.0% |
| Hopedale, IL | 807 | 44 | 12.0% |
| Millersburg, IN | 807 | 37 | 26.0% |
| Canyon City, OR | 807 | 20 | 60.0% |
| Tranquillity, CA | 807 | 50 | = 100 |
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