Tanner Farmhouse · Photo: rossograph · CC BY-SA 4.0Semmes sits near the top of U.S. towns for precipitation, with 65 inches a year
Sunny July days climb to about 91°. By January nights alone, it runs milder than 88% of U.S. towns. Since 1901–2000, the year has warmed by 0.8°, most of all in February. For walks and days out, the stretch from February to April and October to December brings highs of 64–80°.
A year in Semmes at a glance
Each month’s typical high and low, and what it brings.
What stands out about Semmes’ climate
Compared with towns across the U.S., with Semmes’ place in Alabama beside it.
What a year in Semmes feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 268 frost-free days a year
In half of years the last 32° night comes by March 3 and the first by November 25. Frost and day counts come from NOAA’s station at Mobile, AL, 8 miles from the town’s center, at about the same height.
The 2023 USDA map puts Semmes’ center in zone 9a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 21°. 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 65 inches of rain a year
July is the wettest month and October the driest. Rain falls on about 117 days a year. Snow is rare: about 0.2" in a normal year at Mobile, AL, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Semmes
38% 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 Mobile, AL.
Living with Semmes’ climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
268 frost-free days in zone 9a. The last frost comes by Mar 3 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 25.
Months with highs of 62–84° and lows of 40° or more: February, March, April, October, November and December. 12 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Semmes from natural hazards, hurricanes are the largest share (60%); heat waves, cold waves, winter storms and ice storms together are 5%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Semmes and its neighbors
Every town next door is within a degree of Semmes in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Semmes’, 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 |
|---|---|---|---|---|
| Semmes, AL | 40° | 91° | 65" | 0.2" |
| Denham Springs, LA | 41° | 92° | 64" | 0.1" |
| Vidor, TX | 42° | 92° | 61" | 0.1" |
| Magalia, CA | 38° | 92° | 61" | 0.1" |
| Natchez, MS | 38° | 92° | 58" | 0.0" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Semmes averaged 0.8° warmer than the 1900s. The biggest change is in February (+1.3°).
A smaller shift than in 90% 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 Semmes compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Semmes’ place among Alabama’s.
Semmes weather by month
Highs, lows and precipitation from NOAA’s grid at Semmes’ center; snow, wet days and snow on the ground from Mobile, AL. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 62° | 40° | 5.8" | 0.0" | 10 | 0 | 43° – 58° |
| February | 66° | 43° | 4.6" | 0.0" | 9 | 0 | 45° – 64° |
| March | 72° | 49° | 5.3" | 0.1" | 9 | 0 | 55° – 68° |
| April | 78° | 55° | 5.4" | 0.0" | 8 | 0 | 62° – 70° |
| May | 85° | 63° | 5.1" | 0.0" | 8 | 0 | 71° – 76° |
| June | 90° | 70° | 6.5" | 0.0" | 12 | 0 | 77° – 83° |
| July | 91° | 72° | 7.2" | 0.0" | 15 | 0 | 79° – 84° |
| August | 91° | 71° | 6.4" | 0.0" | 13 | 0 | 78° – 84° |
| September | 88° | 67° | 5.1" | 0.0" | 9 | 0 | 75° – 82° |
| October | 80° | 56° | 3.9" | 0.0" | 7 | 0 | 64° – 73° |
| November | 70° | 46° | 4.4" | 0.0" | 8 | 0 | 53° – 63° |
| December | 64° | 42° | 5.4" | 0.1" | 9 | 0 | 46° – 61° |
| Year | 78° | 56° | 65.2" | 0.2" | 117 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 45° to 64°. July is the most reliable, staying within 5°.
Where Semmes’ 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 Semmes’ center.
- Snow: Mobile, AL.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Mobile, AL, 8 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 Semmes’ climate
What is the weather like in Semmes?
A typical July afternoon reaches 91°, a January night drops to 40°, and snow is almost unheard of. Milder January nights than 88% of U.S. towns; hotter July afternoons than 84% of U.S. towns.
How cold does it get in Semmes in winter?
January nights average 40°. About 21 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 43°.
How much snow does Semmes get?
About 0.2 inches in a normal winter at Mobile, AL, so most winters see none.
How hot does it get in Semmes?
July, with a typical high of 91° and a low of 72°. About 78 days a year reach 90° (Mobile, AL).
When is the first and last frost in Semmes?
In half of years the last spring frost (32°) comes by March 3 and the first fall frost by November 25, about 268 frost-free days, at Mobile, AL.
What growing zone is Semmes in?
Zone 9a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 21°.
What is the best time of year to visit Semmes?
By one simple rule (highs of 62–84° and lows of 40° or more), February, March, April, October, November and December. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Semmes getting warmer?
Yes: 1991–2020 averaged 0.8° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 90% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Semmes.
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.