Arnold Line’s winters are milder and less snowy than most of the U.S.
A typical July afternoon reaches 92°, a January night drops to 37°, and snow is almost unheard of.
A year in Arnold Line at a glance
Each month’s typical high and low, and what it brings.
What stands out about Arnold Line’s climate
Compared with towns across the U.S., with Arnold Line’s place in Mississippi beside it.
What a year in Arnold Line feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 261 frost-free days a year
In half of years the last 32° night comes by March 7 and the first by November 23. Frost and day counts come from NOAA’s station at Hattiesburg 5sw, MS, 6 miles from the town’s center, 170 ft higher.
The 2023 USDA map puts Arnold Line’s center in zone 8b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 19°. 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 61 inches of rain a year
January is the wettest month and October the driest. Rain falls on about 116 days a year. Snow is rare: about 0.9" in a normal year at Hattiesburg 5sw, MS, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Arnold Line
44% 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 Hattiesburg 5sw, MS.
Living with Arnold Line’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
261 frost-free days in zone 8b. The last frost comes by Mar 7 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 23.
Months with highs of 62–84° and lows of 40° or more: February, March, April, October and November.
Parks & trails →Of the yearly building losses FEMA expects in Arnold Line from natural hazards, river flooding is the largest share (54%); heat waves, cold waves, winter storms and ice storms together are 9%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Arnold Line and its neighbors
Every town next door is within a degree of Arnold Line in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Arnold Line’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 |
|---|---|---|---|---|
| Arnold Line, MS | 37° | 92° | 61" | 0.9" |
| Opp, AL | 37° | 91° | 59" | 0.3" |
| Pineville, LA | 39° | 92° | 59" | 0.4" |
| Magalia, CA | 38° | 92° | 61" | 0.1" |
| Silsbee, TX | 40° | 92° | 61" | 0.1" |
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 Arnold Line averaged 0.5° warmer than the 1900s. The biggest change is in February (+1.3°).
A smaller shift than in 98% 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 Arnold Line compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Arnold Line’s place among Mississippi’s.
Arnold Line weather by month
Highs, lows and precipitation from NOAA’s grid at Arnold Line’s center; snow, wet days and snow on the ground from Hattiesburg 5sw, MS. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 60° | 37° | 6.0" | 0.2" | 11 | 0 | 42° – 56° |
| February | 65° | 41° | 5.4" | 0.1" | 11 | 0 | 43° – 61° |
| March | 72° | 47° | 5.7" | 0.1" | 9 | 0 | 53° – 67° |
| April | 78° | 53° | 5.3" | 0.0" | 8 | 0 | 60° – 70° |
| May | 85° | 61° | 4.5" | 0.0" | 9 | 0 | 70° – 76° |
| June | 90° | 68° | 5.2" | 0.0" | 11 | 0 | 77° – 83° |
| July | 92° | 71° | 5.9" | 0.0" | 13 | 0 | 79° – 83° |
| August | 92° | 70° | 5.4" | 0.0" | 11 | 0 | 78° – 84° |
| September | 88° | 66° | 4.4" | 0.0" | 9 | 0 | 74° – 82° |
| October | 80° | 54° | 3.7" | 0.0" | 6 | 0 | 62° – 72° |
| November | 69° | 44° | 3.9" | 0.0" | 7 | 0 | 51° – 62° |
| December | 62° | 39° | 5.6" | 0.5" | 10 | 0 | 42° – 59° |
| Year | 78° | 54° | 60.8" | 0.9" | 116 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 43° to 61°. July is the most reliable, staying within 5°.
Where Arnold Line’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 Arnold Line’s center.
- Snow: Hattiesburg 5sw, MS.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Hattiesburg 5sw, MS, 6 miles from the town’s center, 170 ft higher; 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 Arnold Line’s climate
What is the weather like in Arnold Line?
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 Arnold Line in winter?
January nights average 37°. About 32 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 42°.
How much snow does Arnold Line get?
About 0.9 inches in a normal winter at Hattiesburg 5sw, MS, so most winters see none.
How hot does it get in Arnold Line?
July, with a typical high of 92° and a low of 71°. About 85 days a year reach 90° and 2 reach 100° (Hattiesburg 5sw, MS).
When is the first and last frost in Arnold Line?
In half of years the last spring frost (32°) comes by March 7 and the first fall frost by November 23, about 261 frost-free days, at Hattiesburg 5sw, MS.
What growing zone is Arnold Line in?
Zone 8b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 19°.
What is the best time of year to visit Arnold Line?
By one simple rule (highs of 62–84° and lows of 40° or more), February, March, April, October and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Arnold Line getting warmer?
Yes: 1991–2020 averaged 0.5° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 98% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Arnold Line.
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.