Weather and climate in Harrison, TN
What the weather is like in Harrison
The warmest month in Harrison is August, with average highs of 90°F. The coolest is January, when nights average 29°F. About 53.3 in of rain and snow falls in a typical year, most in December and least in October.
Skies are clearest in October (48% average cloud cover) and cloudiest in February (68%). Combining cloud with the length of truly dark nights, November, October, September offer the most clear, dark hours for stargazing.
Clear, dark hours per night
Hours of full astronomical darkness in mid-month, multiplied by the average share of clear sky. A rough guide to how much good observing time a typical night offers.
Monthly averages
| Month | High | Low | Precipitation | Cloud cover | Humidity | Wind | Dark hours |
|---|---|---|---|---|---|---|---|
| January | 48°F | 29°F | 4.3 in | 64% | 83% | 1 mph | 11.0 h |
| February | 52°F | 32°F | 4.8 in | 68% | 83% | 1 mph | 10.2 h |
| March | 61°F | 40°F | 4.6 in | 63% | 81% | 1 mph | 9.2 h |
| April | 71°F | 48°F | 4.5 in | 57% | 78% | 1 mph | 7.9 h |
| May | 79°F | 58°F | 4.5 in | 58% | 77% | 1 mph | 6.7 h |
| June | 87°F | 66°F | 4.2 in | 55% | 73% | 1 mph | 5.9 h |
| July | 90°F | 69°F | 5.0 in | 60% | 71% | 1 mph | 6.3 h |
| August | 90°F | 68°F | 3.8 in | 55% | 70% | 1 mph | 7.5 h |
| September | 84°F | 61°F | 4.3 in | 49% | 70% | 1 mph | 8.8 h |
| October | 73°F | 49°F | 3.5 in | 48% | 72% | 1 mph | 9.9 h |
| November | 61°F | 38°F | 4.3 in | 51% | 76% | 1 mph | 10.8 h |
| December | 51°F | 33°F | 5.5 in | 65% | 84% | 1 mph | 11.2 h |
Climate nearby
Climate averages: NASA POWER, 2001–2025, for the grid area around 35.00, -85.00 (about 50 km across). High and low temperatures are estimated from the monthly mean and the average daily range. Hills, coasts and cities can differ from the area average. Sources and methods.