| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 63°F | 49°F | 3.3" |
| February | 43°F | 67°F | 53°F | 1.7" |
| March | 51°F | 74°F | 61°F | 4.5" |
| April | 58°F | 81°F | 68°F | 3.2" |
| May | 65°F | 86°F | 74°F | 4.7" |
| June | 72°F | 92°F | 81°F | 2.2" |
| July | 74°F | 96°F | 84°F | 1.3" |
| August | 73°F | 96°F | 84°F | 2.8" |
| September | 68°F | 91°F | 78°F | 4.7" |
| October | 57°F | 82°F | 68°F | 4.5" |
| November | 49°F | 73°F | 59°F | 3.7" |
| December | 42°F | 64°F | 51°F | 2.8" |
| Index | Normangee | Texas | National |
| Air quality index | 38 | 52 | 42 |
| Pollution index | 2,639,400 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 329 |
| Days with moderate air quality | 36 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Marquez, TX | 250 | 38 | 24.0% |
| Hilltop Lakes, TX | 805 | 38 | 24.0% |
| Leona, TX | 287 | 41 | 18.0% |
| Madisonville, TX | 4,740 | 41 | 18.0% |
| Normangee, TX | 772 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Altheimer, AR | 772 | 45 | 10.0% |
| Deer Park, CA | 772 | 34 | 32.0% |
| Essex, IA | 772 | 40 | 20.0% |
| Hatfield, IN | 772 | 43 | 14.0% |
| Greensburg, KS | 772 | 15 | 70.0% |
| Normangee, TX | 772 | 38 | 24.0% |
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