Clarksville Wastewater Treatment Plant, Tennessee climate: Climate normals at a NOAA weather station
Clarksville Wastewater Treatment Plant's normal year runs from 28°F January nights to 90°F July afternoons, with 53.5 inches of precipitation and less than an inch of snow (0.5 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 15.1°C, January lows of −2°C, July highs of 32°C, 1,359 mm of precipitation a year.
- NOAA stationClarksville Wastewater Treatment Plant
- Station IDUSC00401790
- Location36.55°N 87.34°W
- Elevation402 ft (123 m)
On October 23, the normal high in Clarksville Wastewater Treatment Plant is 70°F and the normal low 45°F, and the chance of measurable rain or snow is 32%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Clarksville Wastewater Treatment Plant.
- Jan 47° 28°
- Feb 52° 31°
- Mar 61° 38°
- Apr 72° 47°
- May 79° 57°
- Jun 87° 65°
- Jul 90° 69°
- Aug 90° 67°
- Sep 84° 60°
- Oct 72° 48°
- Nov 60° 37°
- Dec 50° 31°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Clarksville Wastewater Treatment Plant each month?
July is the warmest month, with normal highs of 90°F; January the coldest, with normal lows of 28°F. The most precipitation falls in May (5.59 in), the least in September (3.35 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 47°F | 28°F | 37.3°F | 4.03 | 12 | <1 | 21 | 10 h |
| February | 52°F | 31°F | 41.1°F | 4.51 | 11 | <1 | 17 | 10 h 50 min |
| March | 61°F | 38°F | 49.6°F | 4.78 | 12 | <1 | 10 | 11 h 50 min |
| April | 72°F | 47°F | 59.4°F | 4.97 | 12 | <1 | 2 | 13 h 10 min |
| May | 79°F | 57°F | 68.1°F | 5.59 | 12 | 3 | <1 | 14 h 10 min |
| June | 87°F | 65°F | 75.8°F | 4.65 | 11 | 11 | <1 | 14 h 40 min |
| July | 90°F | 69°F | 79.5°F | 4.59 | 10 | 19 | <1 | 14 h 30 min |
| August | 90°F | 67°F | 78.5°F | 3.69 | 9 | 16 | <1 | 13 h 40 min |
| September | 84°F | 60°F | 71.7°F | 3.35 | 9 | 7 | <1 | 12 h 30 min |
| October | 72°F | 48°F | 60.0°F | 4.31 | 9 | 1 | 1 | 11 h 20 min |
| November | 60°F | 37°F | 48.4°F | 4.11 | 11 | <1 | 10 | 10 h 20 min |
| December | 50°F | 31°F | 40.6°F | 4.92 | 12 | <1 | 18 | 9 h 40 min |
| Year (annual) | 70°F | 48°F | 59.2°F | 53.50 | 130 | 57 | 78 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 8°C | −2°C | 2.9°C | 102 mm |
| February | 11°C | −1°C | 5.1°C | 115 mm |
| March | 16°C | 3°C | 9.8°C | 121 mm |
| April | 22°C | 8°C | 15.2°C | 126 mm |
| May | 26°C | 14°C | 20.1°C | 142 mm |
| June | 30°C | 18°C | 24.3°C | 118 mm |
| July | 32°C | 21°C | 26.4°C | 117 mm |
| August | 32°C | 20°C | 25.8°C | 94 mm |
| September | 29°C | 15°C | 22.1°C | 85 mm |
| October | 22°C | 9°C | 15.6°C | 109 mm |
| November | 15°C | 3°C | 9.1°C | 104 mm |
| December | 10°C | 0°C | 4.8°C | 125 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00401790; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
Which months are mildest at Clarksville Wastewater Treatment Plant?
Normal highs sit between 65°F and 85°F in April, May, September and October. Of those, September has the fewest days with rain (9).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00401790.
When is the last frost at Clarksville Wastewater Treatment Plant?
In Clarksville Wastewater Treatment Plant, the last spring frost (32°F) comes after April 3 in half of years and after April 20 in one year in ten; the first autumn frost comes before November 1 in half of years and before October 20 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 31 year in 10 after April 20; 9 in 10 after March 19
- First autumn frost, half of years before
- November 11 year in 10 before October 20; 9 in 10 before November 14
NOAA puts the median frost-free season at 212 days, and the season without a hard freeze (28°F) at 235 days.
A hard freeze (28°F) comes after March 22 in half of springs and before November 11 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Clarksville Wastewater Treatment Plant in zone 7b in ZIP code 37040, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 7b: the coldest night of a typical year reaches 7°F (24 complete years).
Frost dates for every NOAA station in Tennessee · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00401790; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get at Clarksville Wastewater Treatment Plant?
In a normal year in Clarksville Wastewater Treatment Plant, 57 days a year reach 90°F (2 of them 100°F or more), 78 nights fall to 32°F or colder and 130 days bring measurable precipitation.
- Days at 90°F or more
- 57a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 78a normal year
- Days that stay below freezing
- 8high of 32°F or less
- Days with 0.01 inch of precipitation
- 130a normal year
The highest temperature in this station's record (since 1890) is 112°F, on September 7, 1925; the lowest is −20°F, on January 16, 1982.
The wettest calendar year on that record is 1957, with 71.89 in; the snowiest season is 1959–60, with 33.1 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00401790; records: ACIS (NOAA Regional Climate Centers), station USC00401790. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Clarksville Wastewater Treatment Plant?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds at Clarksville Wastewater Treatment Plant, 4.3 kWh per square metre a day. August is the sunniest month (81%) and February the cloudiest (63%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 66% | 2.2 |
| February | 63% | 2.8 |
| March | 67% | 3.9 |
| April | 73% | 5.2 |
| May | 75% | 5.8 |
| June | 81% | 6.4 |
| July | 81% | 6.2 |
| August | 81% | 5.6 |
| September | 80% | 4.8 |
| October | 76% | 3.6 |
| November | 73% | 2.6 |
| December | 64% | 1.9 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How many heating and cooling degree days does Clarksville Wastewater Treatment Plant record?
A normal year at Clarksville Wastewater Treatment Plant brings 3,757 heating degree days, 30% fewer than the median U.S. place (5,373), and 1,662 cooling degree days, 83% more than the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 4,716 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 859 | 0 |
| February | 670 | 1 |
| March | 484 | 7 |
| April | 210 | 42 |
| May | 53 | 149 |
| June | 2 | 326 |
| July | 0 | 448 |
| August | 0 | 419 |
| September | 21 | 222 |
| October | 199 | 44 |
| November | 502 | 4 |
| December | 757 | 0 |
| Year (annual) | 3,757 | 1,662 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00401790. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Have recent years at Clarksville Wastewater Treatment Plant been warmer than normal?
2024 averaged 62.4°F, 3.2°F above the 1991-2020 normal of 59.2°F. 3 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 60.0°F | +0.8°F | 55.81 |
| 2022 | 59.2°F | at normal | 49.20 |
| 2023 | 61.3°F | +2.1°F | 45.11 |
| 2024 | 62.4°F | +3.2°F | 58.50 |
Over 120 complete years from 1854 to 2022, the station's annual mean temperature rose at a fitted 2.0°F per century (+0.11°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00401790; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Clarksville Wastewater Treatment Plant's climate compare?
Clarksville Wastewater Treatment Plant is warmer than 82 of the 116 places with their own NOAA record in Tennessee, and wetter than 24. Across the 7,247 U.S. stations with normals, its annual mean of 59.2°F is warmer than 72%.
In the Köppen classification computed from these normals, Clarksville Wastewater Treatment Plant is Cfa: temperate, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Clarksville Wastewater Treatment Plant share this climate record?
Guthrie has no NOAA station with 1991-2020 normals of its own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Guthrie, KY1,362 people · 12 mi NE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Clarksville Wastewater Treatment Plant's climate
What is the coldest month at Clarksville Wastewater Treatment Plant?
January, with a normal high of 47°F and a normal low of 28°F. The warmest is July (90°F by day, 69°F at night).
Does it snow at Clarksville Wastewater Treatment Plant?
Rarely: NOAA's normal is 0.5 inch a year.
What is the rainiest month at Clarksville Wastewater Treatment Plant?
May, with 5.59 in of precipitation in a normal year; the driest is September with 3.35 in.
What plant hardiness zone is Clarksville Wastewater Treatment Plant in?
The USDA's 2023 map puts Clarksville Wastewater Treatment Plant in zone 7b in ZIP code 37040, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 7°F (24 years, 1991-2020): zone 7b.
How late can frost come at Clarksville Wastewater Treatment Plant?
In half of years the last 32°F night comes after April 3; in one year in ten it comes after April 20. Waiting until April 20 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Tennessee climateThe statewide normals and every place in the state
- Clarksville, TN7 miles from this station, 58.4°F a year
- Cheatham Lock and Dam, TN17 miles from this station, 58.7°F a year
- Elkton, KY21 miles from this station, 57.4°F a year
- Hopkinsville, KY23 miles from this station, 58.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made