Big Rock, TN climate
Big Rock has chilly winters and warm summers, with plenty of rain. A typical July afternoon reaches 89°, a January night drops to 28°, and about 4 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Big Rock feels like
Winter
Spring
Summer
Fall
Big Rock weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 46° | 28° | 4.0" | 1.3" | 9 | 30° – 45° |
| February | 51° | 31° | 4.5" | 1.3" | 8 | 30° – 49° |
| March | 60° | 38° | 5.2" | 0.4" | 10 | 42° – 61° |
| April | 70° | 46° | 5.4" | 0 | 10 | 52° – 64° |
| May | 78° | 56° | 5.3" | 0 | 10 | 62° – 73° |
| June | 85° | 65° | 4.7" | 0 | 8 | 71° – 79° |
| July | 89° | 69° | 4.6" | 0 | 8 | 74° – 83° |
| August | 88° | 67° | 3.4" | 0 | 7 | 72° – 85° |
| September | 82° | 60° | 3.6" | 0 | 7 | 67° – 77° |
| October | 71° | 48° | 3.7" | 0 | 7 | 55° – 65° |
| November | 59° | 37° | 4.2" | 0.1" | 8 | 42° – 54° |
| December | 49° | 31° | 4.8" | 0.7" | 9 | 28° – 50° |
| Year | 69° | 48° | 53.4" | 3.8" | 100 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Big Rock
Big Rock gets 53 inches of rain and melted snow a year. April is the wettest month and August the driest. Rain or snow falls on about 100 days a year.
About 210 frost-free days a year
In half of years the last 32° night comes by April 4 and the first one by October 31. That leaves about 210 frost-free days for gardens, longer than 78% of U.S. towns.
Heating and cooling a home in Big Rock
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Big Rock, 71% of that work is heating and 29% is cooling.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Big Rock compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Big Rock averaged 0.8° warmer than the 1900s. The biggest change is in December (+1.6°). The shift is smaller than in 84% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Big Rock’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 28° to 50°. July is the most reliable, staying within 8°.
Common questions about Big Rock’s climate
What is the coldest month in Big Rock?
January, with a typical high of 46° and a low of 28°.
What is the hottest month in Big Rock?
July, with a typical high of 89° and a low of 69°. About 34 days a year reach 90°.
How much snow does Big Rock get?
About 4 inches in a normal winter, most of it in January.
When is the first frost in Big Rock?
In half of years the first 32° night comes by October 31, and the last spring frost by April 4.
What is the rainiest month in Big Rock?
April, with 5.4 inches of rain and melted snow. The year totals 53 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Big Rock itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Dover 1 W, TN (9 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.