St. Martinville, Louisiana climate: Normal weather by month, frost dates and records
St. Martinville's normal year runs from 42°F January nights to 91°F July afternoons, with 66.4 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 19.9°C, January lows of 5°C, July highs of 33°C, 1,687 mm of precipitation a year.
- NOAA stationSt Martinville (3 mi SW)
- Station IDUSC00168181
- Location30.09°N 91.87°W
- Elevation30 ft (9 m)
- Population5,229
On October 23, the normal high in St. Martinville is 78°F and the normal low 55°F, and the chance of measurable rain or snow is 20%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for St. Martinville.
- Jan 62° 42°
- Feb 65° 46°
- Mar 71° 52°
- Apr 78° 58°
- May 84° 66°
- Jun 89° 71°
- Jul 91° 73°
- Aug 91° 73°
- Sep 88° 68°
- Oct 80° 58°
- Nov 71° 49°
- Dec 63° 44°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in St. Martinville each month?
July is the warmest month, with normal highs of 91°F; January the coldest, with normal lows of 42°F. The most precipitation falls in June (8.40 in), the least in March (3.67 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 62°F | 42°F | 51.6°F | 6.18 | 9 | <1 | 6 | 10 h 20 min |
| February | 65°F | 46°F | 55.4°F | 4.52 | 7 | <1 | 3 | 11 h 10 min |
| March | 71°F | 52°F | 61.5°F | 3.67 | 7 | <1 | 1 | 12 h |
| April | 78°F | 58°F | 67.5°F | 5.25 | 6 | <1 | <1 | 12 h 50 min |
| May | 84°F | 66°F | 74.7°F | 5.04 | 7 | 5 | <1 | 13 h 40 min |
| June | 89°F | 71°F | 79.9°F | 8.40 | 11 | 14 | <1 | 14 h |
| July | 91°F | 73°F | 81.8°F | 6.75 | 12 | 21 | <1 | 13 h 50 min |
| August | 91°F | 73°F | 81.8°F | 6.43 | 10 | 21 | <1 | 13 h 20 min |
| September | 88°F | 68°F | 78.0°F | 5.77 | 8 | 11 | <1 | 12 h 20 min |
| October | 80°F | 58°F | 69.1°F | 4.63 | 6 | 1 | <1 | 11 h 30 min |
| November | 71°F | 49°F | 59.7°F | 5.05 | 7 | <1 | 1 | 10 h 40 min |
| December | 63°F | 44°F | 53.4°F | 4.71 | 8 | <1 | 5 | 10 h 10 min |
| Year (annual) | 78°F | 58°F | 67.9°F | 66.40 | 99 | 74 | 16 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 16°C | 5°C | 10.9°C | 157 mm |
| February | 18°C | 8°C | 13.0°C | 115 mm |
| March | 22°C | 11°C | 16.4°C | 93 mm |
| April | 25°C | 14°C | 19.7°C | 133 mm |
| May | 29°C | 19°C | 23.7°C | 128 mm |
| June | 32°C | 22°C | 26.6°C | 213 mm |
| July | 33°C | 23°C | 27.7°C | 171 mm |
| August | 33°C | 23°C | 27.7°C | 163 mm |
| September | 31°C | 20°C | 25.6°C | 147 mm |
| October | 27°C | 14°C | 20.6°C | 118 mm |
| November | 22°C | 9°C | 15.4°C | 128 mm |
| December | 17°C | 6°C | 11.9°C | 120 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00168181; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit St. Martinville?
Normal highs sit between 65°F and 85°F in March, April, May, October and November. Of those, April has the fewest days with rain (6).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00168181.
When is the last frost in St. Martinville?
In St. Martinville, the last spring frost (32°F) comes after February 21 in half of years and after March 17 in one year in ten; the first autumn frost comes before November 27 in half of years and before November 9 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- February 211 year in 10 after March 17; 9 in 10 after January 22
- First autumn frost, half of years before
- November 271 year in 10 before November 9; 9 in 10 before December 28
NOAA puts the median frost-free season at 280 days, and the season without a hard freeze (28°F) at 319 days.
A hard freeze (28°F) comes after February 1 in half of springs and before December 14 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts St. Martinville in zone 9a in ZIP code 70582, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, St. Martinville's NOAA station is in zone 9a: the coldest night of a typical year reaches 23°F (16 complete years).
Frost dates for every NOAA station in Louisiana · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00168181; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in St. Martinville?
In a normal year in St. Martinville, 74 days a year reach 90°F, 16 nights fall to 32°F or colder and 99 days bring measurable precipitation.
- Days at 90°F or more
- 74a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 16a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 99a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00168181.
How sunny is St. Martinville?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around St. Martinville, 4.7 kWh per square metre a day. October is the sunniest month (83%) and February the cloudiest (68%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 71% | 2.9 |
| February | 68% | 3.4 |
| March | 74% | 4.6 |
| April | 79% | 5.7 |
| May | 81% | 6.2 |
| June | 79% | 6.1 |
| July | 79% | 5.9 |
| August | 80% | 5.6 |
| September | 82% | 5.1 |
| October | 83% | 4.4 |
| November | 80% | 3.4 |
| December | 70% | 2.6 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does St. Martinville need?
A normal year in St. Martinville brings 1,549 heating degree days, 71% fewer than the median U.S. place (5,373), and 2,619 cooling degree days, 2.9 times the median (908). Two months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 6,797 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 427 | 12 |
| February | 287 | 18 |
| March | 159 | 50 |
| April | 49 | 125 |
| May | 5 | 306 |
| June | 0 | 447 |
| July | 0 | 521 |
| August | 0 | 521 |
| September | 1 | 389 |
| October | 43 | 170 |
| November | 197 | 39 |
| December | 381 | 20 |
| Year (annual) | 1,549 | 2,619 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00168181. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does St. Martinville's climate compare?
St. Martinville is warmer than 40 of the other 64 places with their own NOAA record in Louisiana, and wetter than 57. Across the 7,247 U.S. stations with normals, its annual mean of 67.9°F is warmer than 93%.
In the Köppen classification computed from these normals, St. Martinville is Cfa: temperate, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near St. Martinville share this climate record?
3 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Cade, LA1,775 people · 2 mi W
- Parks, LA632 people · 9 mi N
- Catahoula, LA412 people · 12 mi NE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about St. Martinville's climate
What is the coldest month in St. Martinville?
January, with a normal high of 62°F and a normal low of 42°F. The warmest is July (91°F by day, 73°F at night).
Does it snow in St. Martinville?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month in St. Martinville?
June, with 8.40 in of precipitation in a normal year; the driest is March with 3.67 in.
What plant hardiness zone is St. Martinville in?
The USDA's 2023 map puts St. Martinville in zone 9a in ZIP code 70582, the nearest ZIP area. By the same method at St. Martinville's NOAA station, the coldest night of a typical year reaches 23°F (16 years, 1991-2020): zone 9a.
How late can frost come in St. Martinville?
In half of years the last 32°F night comes after February 21; in one year in ten it comes after March 17. Waiting until March 17 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Louisiana climateThe statewide normals and every place in the state
- New Iberia, LA4 miles from this station, 69.2°F a year
- Lafayette, LA11 miles from this station, 69.4°F a year
- Jeanerette, LA13 miles from this station, 67.7°F a year
- Grand Coteau, LA25 miles from this station, 68.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made