Louisa, Virginia climate: Normal weather by month, frost dates and records
Louisa's normal year runs from 25°F January nights to 87°F July afternoons, with 44.2 inches of precipitation and 16 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 13.2°C, January lows of −4°C, July highs of 30°C, 1,123 mm of precipitation a year.
- NOAA stationLouisa
- Station IDUSC00445050
- Location38.04°N 78.01°W
- Elevation420 ft (128 m)
- Population2,201
On October 22, the normal high in Louisa is 67°F and the normal low 42°F, and the chance of measurable rain or snow is 29%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Louisa.
- Jan 45° 25°
- Feb 49° 27°
- Mar 58° 33°
- Apr 70° 42°
- May 76° 52°
- Jun 83° 61°
- Jul 87° 65°
- Aug 85° 64°
- Sep 79° 56°
- Oct 69° 44°
- Nov 57° 34°
- Dec 48° 28°
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 Louisa each month?
July is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 25°F. The most precipitation falls in September (4.49 in), the least in February (2.74 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 45°F | 25°F | 35.3°F | 3.00 | 4.5 | 9 | <1 | 24 | 9 h 50 min |
| February | 49°F | 27°F | 38.2°F | 2.74 | 6.1 | 8 | <1 | 21 | 10 h 50 min |
| March | 58°F | 33°F | 45.5°F | 3.70 | 1.5 | 10 | <1 | 16 | 11 h 50 min |
| April | 70°F | 42°F | 56.1°F | 3.38 | 0.3 | 11 | <1 | 6 | 13 h 10 min |
| May | 76°F | 52°F | 64.0°F | 3.97 | 0.0 | 12 | 1 | 1 | 14 h 10 min |
| June | 83°F | 61°F | 71.9°F | 4.33 | 0.0 | 11 | 7 | <1 | 14 h 50 min |
| July | 87°F | 65°F | 76.0°F | 4.18 | 0.0 | 11 | 13 | <1 | 14 h 30 min |
| August | 85°F | 64°F | 74.4°F | 3.68 | 0.0 | 9 | 9 | <1 | 13 h 40 min |
| September | 79°F | 56°F | 67.6°F | 4.49 | 0.0 | 10 | 3 | <1 | 12 h 30 min |
| October | 69°F | 44°F | 56.5°F | 3.81 | 0.0 | 8 | <1 | 4 | 11 h 20 min |
| November | 57°F | 34°F | 45.8°F | 3.59 | 0.1 | 9 | <1 | 16 | 10 h 10 min |
| December | 48°F | 28°F | 38.1°F | 3.33 | 3.3 | 10 | <1 | 23 | 9 h 30 min |
| Year (annual) | 67°F | 44°F | 55.8°F | 44.20 | 15.8 | 118 | 33 | 110 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 7°C | −4°C | 1.8°C | 76 mm | 11 cm |
| February | 10°C | −3°C | 3.4°C | 70 mm | 15 cm |
| March | 15°C | 0°C | 7.5°C | 94 mm | 4 cm |
| April | 21°C | 6°C | 13.4°C | 86 mm | 1 cm |
| May | 24°C | 11°C | 17.8°C | 101 mm | 0 cm |
| June | 28°C | 16°C | 22.2°C | 110 mm | 0 cm |
| July | 30°C | 18°C | 24.4°C | 106 mm | 0 cm |
| August | 30°C | 18°C | 23.6°C | 93 mm | 0 cm |
| September | 26°C | 13°C | 19.8°C | 114 mm | 0 cm |
| October | 20°C | 7°C | 13.6°C | 97 mm | 0 cm |
| November | 14°C | 1°C | 7.7°C | 91 mm | 0 cm |
| December | 9°C | −2°C | 3.4°C | 85 mm | 8 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00445050; 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 Louisa?
Normal highs sit between 65°F and 85°F in April, May, June, September and October. Of those, October has the fewest days with rain (8).
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 USC00445050.
When is the last frost in Louisa?
In Louisa, the last spring frost (32°F) comes after April 26 in half of years and after May 13 in one year in ten; the first autumn frost comes before October 20 in half of years and before October 7 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 261 year in 10 after May 13; 9 in 10 after April 9
- First autumn frost, half of years before
- October 201 year in 10 before October 7; 9 in 10 before November 1
NOAA puts the median frost-free season at 175 days, and the season without a hard freeze (28°F) at 200 days.
A hard freeze (28°F) comes after April 12 in half of springs and before October 29 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Louisa in zone 7a in ZIP code 23093, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Louisa's NOAA station is in zone 7a: the coldest night of a typical year reaches 1°F (30 complete years).
Frost dates for every NOAA station in Virginia · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00445050; 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 Louisa?
In a normal year in Louisa, 33 days a year reach 90°F, 110 nights fall to 32°F or colder and 118 days bring measurable precipitation.
- Days at 90°F or more
- 33a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 110a normal year
- Days that stay below freezing
- 5high of 32°F or less
- Days with 0.01 inch of precipitation
- 118a normal year
- Days with 1 inch of snow or more
- 4a normal year
The highest temperature in this station's record (since 1916) is 108°F, on July 20, 1930; the lowest is −21°F, on February 5, 1996.
The wettest calendar year on that record is 2003, with 71.57 in; the snowiest season is 2009–10, with 59.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00445050; records: ACIS (NOAA Regional Climate Centers), station USC00445050. Records use complete months only; a month missing more than three days is left out.
How sunny is Louisa?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Louisa, 4.1 kWh per square metre a day. July is the sunniest month (78%) and January the cloudiest (69%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 69% | 2.2 |
| February | 70% | 3.0 |
| March | 70% | 4.0 |
| April | 72% | 5.0 |
| May | 71% | 5.5 |
| June | 77% | 6.2 |
| July | 78% | 6.0 |
| August | 78% | 5.3 |
| September | 75% | 4.4 |
| October | 74% | 3.4 |
| November | 75% | 2.5 |
| December | 70% | 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 much heating and cooling does Louisa need?
A normal year in Louisa brings 4,448 heating degree days, 17% fewer than the median U.S. place (5,373), and 1,119 cooling degree days, 23% 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 3,815 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 921 | 0 |
| February | 750 | 0 |
| March | 607 | 2 |
| April | 292 | 24 |
| May | 112 | 81 |
| June | 15 | 223 |
| July | 1 | 340 |
| August | 2 | 295 |
| September | 52 | 132 |
| October | 284 | 21 |
| November | 579 | 1 |
| December | 834 | 0 |
| Year (annual) | 4,448 | 1,119 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00445050. 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 Louisa been warmer than normal lately?
2025 averaged 57.9°F, 2.1°F above the 1991-2020 normal of 55.8°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 57.1°F | +1.3°F | 38.70 | 17.1 |
| 2022 | 56.1°F | +0.3°F | 49.02 | 23.3 |
| 2023 | 57.6°F | +1.8°F | 40.40 | 0.8 |
| 2024 | 58.9°F | +3.1°F | 40.63 | 2.6 |
| 2025 | 57.9°F | +2.1°F | 35.37 | 20.1 |
Over 84 complete years from 1921 to 2025, the station's annual mean temperature rose at a fitted 1.7°F per century (+0.10°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00445050; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Louisa's climate compare?
Louisa is warmer than 40 of the other 80 places with their own NOAA record in Virginia, and wetter than 27. Across the 7,247 U.S. stations with normals, its annual mean of 55.8°F is warmer than 63%.
In the Köppen classification computed from these normals, Louisa 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 Louisa share this climate record?
2 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.
- Blue Ridge Shores, VA853 people · 5 mi N
- Mineral, VA523 people · 6 mi SE
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 Louisa's climate
What is the coldest month in Louisa?
January, with a normal high of 45°F and a normal low of 25°F. The warmest is July (87°F by day, 65°F at night).
Does it snow in Louisa?
Yes: 16 inches in a normal year, falling on 6 days with 0.1 inch or more, the most in February (6.1 inches).
What is the rainiest month in Louisa?
September, with 4.49 in of precipitation in a normal year; the driest is February with 2.74 in.
What plant hardiness zone is Louisa in?
The USDA's 2023 map puts Louisa in zone 7a in ZIP code 23093, the nearest ZIP area. By the same method at Louisa's NOAA station, the coldest night of a typical year reaches 1°F (30 years, 1991-2020): zone 7a.
How late can frost come in Louisa?
In half of years the last 32°F night comes after April 26; in one year in ten it comes after May 13. Waiting until May 13 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Virginia climateThe statewide normals and every place in the state
- Piedmont Research Station, VA14 miles from this station, 56.1°F a year
- Somerset, VA20 miles from this station, 55.6°F a year
- Palmyra, VA21 miles from this station, 55.3°F a year
- Monticello, VA24 miles from this station, 55.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made