Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 19°F | 35°F | 27°F | 1.8" |
February | 26°F | 43°F | 34°F | 1.3" |
March | 33°F | 55°F | 43°F | 1.7" |
April | 38°F | 62°F | 49°F | 2.3" |
May | 46°F | 72°F | 58°F | 2.5" |
June | 55°F | 85°F | 70°F | 1.1" |
July | 65°F | 94°F | 79°F | 0.3" |
August | 63°F | 90°F | 76°F | 0.8" |
September | 53°F | 80°F | 66°F | 1.5" |
October | 42°F | 65°F | 52°F | 1.7" |
November | 32°F | 52°F | 40°F | 1.1" |
December | 22°F | 37°F | 29°F | 1.7" |
Index | Roy | Utah | National |
Air quality index | 45 | 45 | 42 |
Pollution index | 17,030,300 | 3,340,369 | 2,726,193 |
Measurement | Total |
Days measured | 365 |
Days with good air quality | 244 |
Days with moderate air quality | 113 |
Days w/ poor A.Q. for sensitive groups | 8 |
Days with unhealthy air quality | 0 |
Pollutant | Total |
Arsenic | 0.280% |
Benzene | 0.230% |
Carbon Tetrachloride | 0.000% |
Lead | 0.360% |
Mercury | 0.040% |
City | Population | Air Quality Index | National Avg. |
Clinton, UT | 22,191 | 45 | 10.0% |
Sunset, UT | 5,309 | 45 | 10.0% |
Harrisville, UT | 6,637 | 45 | 10.0% |
Mountain Green, UT | 3,694 | 45 | 10.0% |
Pleasant View, UT | 10,460 | 45 | 10.0% |
Roy, UT | 39,243 | 45 | 10.0% |
City | Population | Air Quality Index | National Avg. |
Milton, GA | 39,252 | 52 | 4.0% |
Lancaster, TX | 39,264 | 51 | 2.0% |
Port Moody, BC | 39,217 | n/a | |
Northglenn, CO | 39,201 | 58 | 16.0% |
Germantown, TN | 39,196 | 45 | 10.0% |
Roy, UT | 39,243 | 45 | 10.0% |