Simpson is among the wettest of U.S. towns: 60 inches of precipitation a year
In July the day’s top temperature is typically 92°. Summer afternoons here are warmer than in 88% of U.S. towns. Since 1901–2000, the year has warmed by 0.8°, most of all in February. The frost-free window for a garden runs roughly March 1 to November 23.
A year in Simpson at a glance
Each month’s typical high and low, and what it brings.
What stands out about Simpson’s climate
Compared with towns across the U.S., with Simpson’s place in Louisiana beside it.
What a year in Simpson 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 1 and the first by November 23. Frost and day counts come from NOAA’s station at Ft Polk Fullerton Lndg Strip, LA, 8 miles from the town’s center, at about the same height.
The 2023 USDA map puts Simpson’s 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 60 inches of rain a year
December is the wettest month and August the driest. Rain falls on about 109 days a year. Snow is rare: about 0.0" in a normal year at Boyce 3 Wnw, LA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Simpson
39% 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 Ft Polk Fullerton Lndg Strip, LA.
Living with Simpson’s 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 1 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 Simpson from natural hazards, river flooding is the largest share (39%); heat waves, cold waves, winter storms and ice storms together are 14%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Simpson and similar climates
TownRatings has no climate map of the towns around Simpson yet.
Climates most like Simpson’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 |
|---|---|---|---|---|
| Simpson, LA | 38° | 92° | 60" | 0.0" |
| Magalia, CA | 38° | 92° | 61" | 0.1" |
| Laurel, MS | 36° | 92° | 60" | 0.0" |
| Enterprise, AL | 38° | 91° | 58" | 0.0" |
| DeFuniak Springs, FL | 39° | 91° | 62" | 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 Simpson averaged 0.7° warmer than the 1900s. The biggest change is in February (+1.4°).
A smaller shift than in 92% 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 Simpson compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Simpson’s place among Louisiana’s.
Simpson weather by month
Highs, lows and precipitation from NOAA’s grid at Simpson’s center; snow, wet days and snow on the ground from Boyce 3 Wnw, LA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 60° | 38° | 5.7" | 0.0" | 10 | 0 | 43° – 56° |
| February | 64° | 42° | 5.0" | 0.0" | 10 | 0 | 44° – 63° |
| March | 71° | 48° | 5.1" | 0.0" | 9 | 0 | 54° – 67° |
| April | 78° | 54° | 5.4" | 0.0" | 8 | 0 | 61° – 71° |
| May | 84° | 63° | 4.7" | 0.0" | 9 | 0 | 70° – 77° |
| June | 90° | 69° | 4.8" | 0.0" | 10 | 0 | 77° – 84° |
| July | 92° | 71° | 4.7" | 0.0" | 10 | 0 | 79° – 86° |
| August | 93° | 71° | 4.1" | 0.0" | 8 | 0 | 77° – 88° |
| September | 88° | 66° | 4.4" | 0.0" | 7 | 0 | 74° – 81° |
| October | 79° | 55° | 4.9" | 0.0" | 7 | 0 | 63° – 73° |
| November | 69° | 46° | 5.3" | 0.0" | 9 | 0 | 52° – 62° |
| December | 61° | 40° | 5.7" | 0.0" | 11 | 0 | 42° – 58° |
| Year | 77° | 55° | 59.8" | 0.0" | 109 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 44° to 63°. May is the most reliable, staying within 7°.
Where Simpson’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 Simpson’s center.
- Snow: Boyce 3 Wnw, LA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Ft Polk Fullerton Lndg Strip, LA, 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 Simpson’s climate
What is the weather like in Simpson?
A typical July afternoon reaches 92°, a January night drops to 38°, and snow is almost unheard of. Milder January nights than 86% of U.S. towns; hotter July afternoons than 88% of U.S. towns.
How cold does it get in Simpson in winter?
January nights average 38°. About 25 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 43°.
How much snow does Simpson get?
About 0.0 inches in a normal winter at Boyce 3 Wnw, LA, so most winters see none.
How hot does it get in Simpson?
July, with a typical high of 92° and a low of 71°. About 107 days a year reach 90° and 9 reach 100° (Ft Polk Fullerton Lndg Strip, LA).
When is the first and last frost in Simpson?
In half of years the last spring frost (32°) comes by March 1 and the first fall frost by November 23, about 268 frost-free days, at Ft Polk Fullerton Lndg Strip, LA.
What growing zone is Simpson 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 Simpson?
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 Simpson getting warmer?
Yes: 1991–2020 averaged 0.8° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 92% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Simpson.
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.