Photo: Nyttend · Public domainIn Gretna, July heat, January chill and rainfall all sit near the middle of U.S. towns
January nights here settle around 27°. Winters are mild: January nights here are milder than in 67% of U.S. towns. The latest 30-year average runs 0.8° warmer than 1901–2000’s, with February up the most. Garden planting can start around April 22; autumn frost returns near October 23.
A year in Gretna at a glance
Each month’s typical high and low, and what it brings.
What stands out about Gretna’s climate
Compared with towns across the U.S., with Gretna’s place in Virginia beside it.
What a year in Gretna feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 183 frost-free days a year
In half of years the last 32° night comes by April 22 and the first by October 23. Frost and day counts come from NOAA’s station at Chatham, VA, 9 miles from the town’s center, 190 ft lower.
The 2023 USDA map puts Gretna’s center in zone 7b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 5°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 6 inches of snow a winter
Snow, measured at Chatham, VA, falls mostly in January. Precipitation (rain plus melted snow) adds up to 46 inches a year; September is the wettest month and February the driest. Rain or snow falls on about 119 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Gretna
81% of the work is heating. Months averaging under 55° run from November through March.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Chatham, VA.
Living with Gretna’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
183 frost-free days in zone 7b. The last frost comes by Apr 22 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 23.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October. 2.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Gretna from natural hazards, river flooding is the largest share (67%); heat waves, cold waves, winter storms and ice storms together are 6%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Gretna and similar climates
TownRatings has no climate map of the towns around Gretna yet.
Climates most like Gretna’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Gretna, VA | 27° | 87° | 46" | 5.8" |
| Rockville, MD | 25° | 86° | 45" | 5.8" |
| Elizabethton, TN | 26° | 86° | 47" | 6.0" |
| Penn Wynne, PA | 25° | 87° | 47" | 7.6" |
| Ashland, KY | 24° | 87° | 45" | 6.2" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Gretna averaged 0.8° warmer than the 1900s. The biggest change is in February (+1.9°).
A smaller shift than in 91% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Gretna compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Gretna’s place among Virginia’s.
Gretna weather by month
Highs, lows and precipitation from NOAA’s grid at Gretna’s center; snow, wet days and snow on the ground from Chatham, VA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 47° | 27° | 3.8" | 1.9" | 10 | 2 | 30° – 43° |
| February | 51° | 29° | 2.8" | 1.6" | 8 | 3 | 31° – 48° |
| March | 59° | 35° | 3.9" | 1.0" | 10 | 1 | 41° – 56° |
| April | 69° | 44° | 3.8" | 0.0" | 11 | 0 | 52° – 62° |
| May | 76° | 53° | 4.4" | 0.0" | 12 | 0 | 59° – 71° |
| June | 83° | 61° | 4.3" | 0.0" | 11 | 0 | 68° – 76° |
| July | 87° | 66° | 4.0" | 0.0" | 11 | 0 | 72° – 79° |
| August | 85° | 65° | 3.7" | 0.0" | 10 | 0 | 71° – 80° |
| September | 79° | 58° | 4.6" | 0.0" | 9 | 0 | 65° – 74° |
| October | 69° | 45° | 3.5" | 0.0" | 9 | 0 | 54° – 62° |
| November | 59° | 35° | 3.5" | 0.0" | 9 | 0 | 42° – 52° |
| December | 50° | 29° | 3.6" | 1.3" | 9 | 1 | 31° – 49° |
| Year | 68° | 45° | 45.8" | 5.8" | 119 | 6 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 31° to 49°. July is the most reliable, staying within 7°.
Where Gretna’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Gretna’s center.
- Snow: Chatham, VA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Chatham, VA, 9 miles from the town’s center, 190 ft lower; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Gretna’s climate
What is the weather like in Gretna?
A typical July afternoon reaches 87°, a January night drops to 27°, and about 6 inches of snow falls in a normal winter. Milder January nights than 67% of U.S. towns; hotter July afternoons than 59% of U.S. towns.
How cold does it get in Gretna in winter?
January nights average 27°. About 125 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 30°.
How much snow does Gretna get?
About 5.8 inches in a normal winter at Chatham, VA, most of it in January, with snow on the ground about 6 days a year.
How hot does it get in Gretna?
July, with a typical high of 87° and a low of 66°. About 22 days a year reach 90° (Chatham, VA).
When is the first and last frost in Gretna?
In half of years the last spring frost (32°) comes by April 22 and the first fall frost by October 23, about 183 frost-free days, at Chatham, VA.
What growing zone is Gretna in?
Zone 7b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 5°.
What is the best time of year to visit Gretna?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Gretna getting warmer?
Yes: 1991–2020 averaged 0.8° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 91% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Gretna.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.