Photo: Infrogmation of New Orleans · CC BY-SA 3.0Few U.S. towns get more rain and snow than Port Gibson: 57 inches a year
January mornings start at about 37°. Expect the heaviest rain or snow in January and the lightest in September. By July afternoons alone, it runs hotter than 87% of U.S. towns. Warm coats and heating bills mark the months from December to January, when means dip under 50°.
A year in Port Gibson at a glance
Each month’s typical high and low, and what it brings.
What stands out about Port Gibson’s climate
Compared with towns across the U.S., with Port Gibson’s place in Mississippi beside it.
What a year in Port Gibson feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 241 frost-free days a year
In half of years the last 32° night comes by March 17 and the first by November 12. Frost and day counts come from NOAA’s station at Port Gibson 1 Ne, MS, 2.1 miles from the town’s center, at about the same height.
The 2023 USDA map puts Port Gibson’s center in zone 8b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 18°. 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 57 inches of rain a year
January is the wettest month and September the driest. Rain falls on about 98 days a year. Snow is rare: about 0.5" in a normal year at Port Gibson 1 Ne, MS, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Port Gibson
47% of the work is heating, so air conditioning is the bigger bill. Months averaging under 55° run from December through February.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Port Gibson 1 Ne, MS.
Living with Port Gibson’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
241 frost-free days in zone 8b. The last frost comes by Mar 17 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 12.
Months with highs of 62–84° and lows of 40° or more: February, March, April, May, October and November. 0.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Port Gibson from natural hazards, river flooding is the largest share (46%); heat waves, cold waves, winter storms and ice storms together are 9%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Port Gibson and similar climates
TownRatings has no climate map of the towns around Port Gibson yet.
Climates most like Port Gibson’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 |
|---|---|---|---|---|
| Port Gibson, MS | 37° | 92° | 57" | 0.5" |
| Dothan, AL | 39° | 92° | 56" | 0.1" |
| Jasper, TX | 39° | 93° | 57" | 0.1" |
| Magalia, CA | 38° | 92° | 61" | 0.1" |
| Tallahassee, FL | 40° | 92° | 56" | 0.0" |
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 Port Gibson averaged 0.5° warmer than the 1900s. The biggest change is in February (+1.2°).
A smaller shift than in 97% 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 Port Gibson compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Port Gibson’s place among Mississippi’s.
Port Gibson weather by month
Highs, lows and precipitation from NOAA’s grid at Port Gibson’s center; snow, wet days and snow on the ground from Port Gibson 1 Ne, MS. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 58° | 37° | 6.2" | 0.2" | 10 | 0 | 42° – 55° |
| February | 63° | 41° | 5.3" | 0.2" | 8 | 0 | 43° – 60° |
| March | 70° | 47° | 5.4" | 0.1" | 9 | 0 | 52° – 67° |
| April | 77° | 53° | 5.3" | 0.0" | 8 | 0 | 60° – 70° |
| May | 84° | 62° | 4.3" | 0.0" | 8 | 0 | 70° – 77° |
| June | 90° | 69° | 4.3" | 0.0" | 9 | 0 | 77° – 83° |
| July | 92° | 72° | 4.4" | 0.0" | 9 | 0 | 79° – 85° |
| August | 92° | 71° | 4.4" | 0.0" | 8 | 0 | 77° – 85° |
| September | 88° | 65° | 3.6" | 0.0" | 7 | 0 | 74° – 81° |
| October | 79° | 54° | 3.9" | 0.0" | 6 | 0 | 63° – 73° |
| November | 68° | 44° | 4.4" | 0.0" | 7 | 0 | 51° – 62° |
| December | 60° | 39° | 5.5" | 0.0" | 9 | 0 | 41° – 59° |
| Year | 77° | 54° | 56.9" | 0.5" | 98 | 0 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 41° to 59°. July is the most reliable, staying within 6°.
Where Port Gibson’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 Port Gibson’s center.
- Snow: Port Gibson 1 Ne, MS.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Port Gibson 1 Ne, MS, 2.1 miles from the town’s center, at about the same height; 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 Port Gibson’s climate
What is the weather like in Port Gibson?
A typical July afternoon reaches 92°, a January night drops to 37°, and snow is almost unheard of. Milder January nights than 85% of U.S. towns; hotter July afternoons than 87% of U.S. towns.
How cold does it get in Port Gibson in winter?
January nights average 37°. About 49 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 42°.
How much snow does Port Gibson get?
About 0.5 inches in a normal winter at Port Gibson 1 Ne, MS, so most winters see none.
How hot does it get in Port Gibson?
July, with a typical high of 92° and a low of 72°. About 80 days a year reach 90° and 2 reach 100° (Port Gibson 1 Ne, MS).
When is the first and last frost in Port Gibson?
In half of years the last spring frost (32°) comes by March 17 and the first fall frost by November 12, about 241 frost-free days, at Port Gibson 1 Ne, MS.
What growing zone is Port Gibson in?
Zone 8b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 18°.
What is the best time of year to visit Port Gibson?
By one simple rule (highs of 62–84° and lows of 40° or more), February, March, April, May, October and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Port Gibson getting warmer?
Yes: 1991–2020 averaged 0.5° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 97% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Port Gibson.
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.