| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 52°F | 38°F | 7.0" |
| February | 32°F | 55°F | 42°F | 5.8" |
| March | 42°F | 66°F | 52°F | 3.7" |
| April | 50°F | 74°F | 60°F | 7.5" |
| May | 58°F | 80°F | 68°F | 4.0" |
| June | 68°F | 90°F | 78°F | 2.1" |
| July | 71°F | 94°F | 82°F | 7.1" |
| August | 70°F | 94°F | 81°F | 4.1" |
| September | 62°F | 86°F | 72°F | 4.7" |
| October | 50°F | 75°F | 61°F | 3.4" |
| November | 40°F | 64°F | 50°F | 3.0" |
| December | 31°F | 51°F | 39°F | 1.1" |
| Index | Shamrock | Oklahoma | National |
| Air quality index | 45 | 55 | 42 |
| Pollution index | 1,685,620 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 249 |
| Days with moderate air quality | 114 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Kendrick, OK | 85 | 36 | 28.0% |
| Stroud, OK | 2,669 | 36 | 28.0% |
| Davenport, OK | 703 | 36 | 28.0% |
| Depew, OK | 442 | 36 | 28.0% |
| Cushing, OK | 7,759 | 36 | 28.0% |
| Shamrock, OK | 31 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Rye, AZ | 31 | 60 | 20.0% |
| Creston, CA | 31 | 46 | 8.0% |
| Jenner, CA | 31 | 34 | 32.0% |
| Moss Landing, CA | 31 | 37 | 26.0% |
| Nubieber, CA | 31 | 42 | 16.0% |
| Shamrock, OK | 31 | 45 | 10.0% |
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