Alamo, Tennessee climate: Normal weather by month, frost dates and records
Alamo's normal year runs from 29°F January nights to 89°F July afternoons, with 53.6 inches of precipitation and 4 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 15.3°C, January lows of −2°C, July highs of 31°C, 1,361 mm of precipitation a year.
- NOAA stationAlamo (1 mi N)
- Station IDUSC00400049
- Location35.80°N 89.12°W
- Elevation330 ft (101 m)
- Population2,334
On October 22, the normal high in Alamo is 70°F and the normal low 47°F, and the chance of measurable rain or snow is 25%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Alamo.
- Jan 47° 29°
- Feb 51° 33°
- Mar 60° 40°
- Apr 70° 50°
- May 78° 59°
- Jun 86° 67°
- Jul 89° 70°
- Aug 88° 68°
- Sep 83° 60°
- Oct 72° 49°
- Nov 60° 39°
- Dec 50° 33°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Alamo each month?
July is the warmest month, with normal highs of 89°F; January the coldest, with normal lows of 29°F. The most precipitation falls in May (5.44 in), the least in July (3.53 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 47°F | 29°F | 37.8°F | 4.23 | 1.3 | 8 | <1 | 21 | 10 h |
| February | 51°F | 33°F | 41.6°F | 4.26 | 1.5 | 8 | <1 | 16 | 10 h 50 min |
| March | 60°F | 40°F | 49.9°F | 5.22 | 0.7 | 10 | <1 | 8 | 11 h 50 min |
| April | 70°F | 50°F | 59.8°F | 4.72 | 0.0 | 9 | <1 | 1 | 13 h |
| May | 78°F | 59°F | 68.8°F | 5.44 | 0.0 | 10 | 1 | <1 | 14 h |
| June | 86°F | 67°F | 76.6°F | 4.53 | 0.0 | 7 | 9 | <1 | 14 h 30 min |
| July | 89°F | 70°F | 79.2°F | 3.53 | 0.0 | 7 | 14 | <1 | 14 h 20 min |
| August | 88°F | 68°F | 77.9°F | 3.83 | 0.0 | 7 | 13 | <1 | 13 h 30 min |
| September | 83°F | 60°F | 71.5°F | 3.76 | 0.0 | 6 | 6 | <1 | 12 h 30 min |
| October | 72°F | 49°F | 60.5°F | 3.83 | 0.0 | 8 | <1 | 1 | 11 h 20 min |
| November | 60°F | 39°F | 49.5°F | 4.87 | 0.0 | 8 | <1 | 8 | 10 h 20 min |
| December | 50°F | 33°F | 41.1°F | 5.38 | 0.2 | 9 | <1 | 16 | 9 h 50 min |
| Year (annual) | 69°F | 50°F | 59.5°F | 53.60 | 3.7 | 95 | 43 | 70 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 8°C | −2°C | 3.2°C | 107 mm | 3 cm |
| February | 10°C | 0°C | 5.3°C | 108 mm | 4 cm |
| March | 15°C | 5°C | 9.9°C | 133 mm | 2 cm |
| April | 21°C | 10°C | 15.4°C | 120 mm | 0 cm |
| May | 26°C | 15°C | 20.4°C | 138 mm | 0 cm |
| June | 30°C | 20°C | 24.8°C | 115 mm | 0 cm |
| July | 31°C | 21°C | 26.2°C | 90 mm | 0 cm |
| August | 31°C | 20°C | 25.5°C | 97 mm | 0 cm |
| September | 28°C | 16°C | 21.9°C | 96 mm | 0 cm |
| October | 22°C | 9°C | 15.8°C | 97 mm | 0 cm |
| November | 15°C | 4°C | 9.7°C | 124 mm | 0 cm |
| December | 10°C | 0°C | 5.1°C | 137 mm | 1 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00400049; 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.
When is the best weather to visit Alamo?
Normal highs sit between 65°F and 85°F in April, May, September and October. Of those, September has the fewest days with rain (6).
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 USC00400049.
When is the last frost in Alamo?
In Alamo, the last spring frost (32°F) comes after March 28 in half of years and after April 12 in one year in ten; the first autumn frost comes before November 4 in half of years and before October 22 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
- March 281 year in 10 after April 12; 9 in 10 after March 11
- First autumn frost, half of years before
- November 41 year in 10 before October 22; 9 in 10 before November 20
NOAA puts the median frost-free season at 220 days, and the season without a hard freeze (28°F) at 245 days.
A hard freeze (28°F) comes after March 16 in half of springs and before November 15 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Alamo in zone 7b in ZIP code 38001, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Alamo's NOAA station is in zone 7b: the coldest night of a typical year reaches 10°F (16 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 USC00400049; 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 in Alamo?
In a normal year in Alamo, 43 days a year reach 90°F (1 of them 100°F or more), 70 nights fall to 32°F or colder and 95 days bring measurable precipitation.
- Days at 90°F or more
- 43a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 70a normal year
- Days that stay below freezing
- 9high of 32°F or less
- Days with 0.01 inch of precipitation
- 95a normal year
- Days with 1 inch of snow or more
- 2a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00400049.
How sunny is Alamo?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Alamo, 4.4 kWh per square metre a day. August is the sunniest month (83%) and February the cloudiest (65%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 69% | 2.4 |
| February | 65% | 3.0 |
| March | 69% | 4.1 |
| April | 75% | 5.3 |
| May | 77% | 6.0 |
| June | 83% | 6.6 |
| July | 83% | 6.3 |
| August | 83% | 5.8 |
| September | 81% | 4.9 |
| October | 78% | 3.8 |
| November | 74% | 2.8 |
| December | 67% | 2.1 |
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 much heating and cooling does Alamo need?
A normal year in Alamo brings 3,652 heating degree days, 32% fewer than the median U.S. place (5,373), and 1,680 cooling degree days, 85% 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 4,781 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 843 | 1 |
| February | 656 | 1 |
| March | 476 | 8 |
| April | 204 | 46 |
| May | 49 | 167 |
| June | 1 | 348 |
| July | 0 | 439 |
| August | 1 | 400 |
| September | 21 | 216 |
| October | 190 | 50 |
| November | 469 | 4 |
| December | 741 | 1 |
| Year (annual) | 3,652 | 1,680 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00400049. 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.
Has Alamo been warmer than normal lately?
2025 averaged 61.0°F, 1.5°F above the 1991-2020 normal of 59.5°F.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2025 | 61.0°F | +1.5°F | 59.36 | 5.5 |
Source: observed years: ACIS, station USC00400049. A year counts only with all twelve months complete.
How does Alamo's climate compare?
Alamo is warmer than 89 of the other 115 places with their own NOAA record in Tennessee, and wetter than 25. Across the 7,247 U.S. stations with normals, its annual mean of 59.5°F is warmer than 73%.
In the Köppen classification computed from these normals, Alamo 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 Alamo share this climate record?
5 places have no NOAA station with 1991-2020 normals of their 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.
- Humboldt, TN7,852 people · 12 mi E
- Bells, TN2,474 people · 6 mi S
- Friendship, TN614 people · 10 mi NW
- Maury City, TN595 people · 6 mi W
- Gadsden, TN476 people · 8 mi E
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 Alamo's climate
What is the coldest month in Alamo?
January, with a normal high of 47°F and a normal low of 29°F. The warmest is July (89°F by day, 70°F at night).
Does it snow in Alamo?
Yes: 4 inches in a normal year, falling on 2 days with 0.1 inch or more, the most in February (1.5 inches).
What is the rainiest month in Alamo?
May, with 5.44 in of precipitation in a normal year; the driest is July with 3.53 in.
What plant hardiness zone is Alamo in?
The USDA's 2023 map puts Alamo in zone 7b in ZIP code 38001, the nearest ZIP area. By the same method at Alamo's NOAA station, the coldest night of a typical year reaches 10°F (16 years, 1991-2020): zone 7b.
How late can frost come in Alamo?
In half of years the last 32°F night comes after March 28; in one year in ten it comes after April 12. Waiting until April 12 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Tennessee climateThe statewide normals and every place in the state
- Brownsville, TN16 miles from this station, 60.9°F a year
- Jackson, TN18 miles from this station, 60.0°F a year
- Dyersburg, TN22 miles from this station, 60.1°F a year
- Ripley, TN22 miles from this station, 60.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made