Marrero, Louisiana climate: Normal weather by month, frost dates and records
Marrero's normal year runs from 43°F January nights to 90°F July afternoons, with 66.1 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 20.2°C, January lows of 6°C, July highs of 32°C, 1,679 mm of precipitation a year.
- NOAA stationMarrero (9 mi SSW)
- Station IDUSC00165926
- Location29.79°N 90.12°W
- Elevation3 ft (1 m)
- Population (census place)31,866
On October 22, the normal high in Marrero is 77°F and the normal low 58°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Marrero.
- Jan 62° 43°
- Feb 66° 47°
- Mar 72° 53°
- Apr 78° 58°
- May 84° 66°
- Jun 89° 72°
- Jul 90° 74°
- Aug 90° 74°
- Sep 87° 70°
- Oct 79° 61°
- Nov 70° 51°
- Dec 64° 46°
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 Marrero each month?
July is the warmest month, with normal highs of 90°F; January the coldest, with normal lows of 43°F. The most precipitation falls in July (7.53 in), the least in October (3.79 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 62°F | 43°F | 52.5°F | 5.32 | – | <1 | 6 | 10 h 30 min |
| February | 66°F | 47°F | 56.4°F | 4.24 | – | <1 | 2 | 11 h 10 min |
| March | 72°F | 53°F | 62.4°F | 5.22 | – | <1 | 1 | 12 h |
| April | 78°F | 58°F | 67.9°F | 5.25 | – | <1 | <1 | 12 h 50 min |
| May | 84°F | 66°F | 74.9°F | 5.48 | – | 5 | <1 | 13 h 40 min |
| June | 89°F | 72°F | 80.1°F | 7.18 | – | 18 | <1 | 14 h |
| July | 90°F | 74°F | 81.8°F | 7.53 | – | 23 | <1 | 13 h 50 min |
| August | 90°F | 74°F | 81.6°F | 6.87 | – | 22 | <1 | 13 h 20 min |
| September | 87°F | 70°F | 78.3°F | 6.34 | – | 11 | <1 | 12 h 20 min |
| October | 79°F | 61°F | 69.8°F | 3.79 | – | 1 | <1 | 11 h 30 min |
| November | 70°F | 51°F | 60.4°F | 3.80 | – | <1 | 1 | 10 h 40 min |
| December | 64°F | 46°F | 54.7°F | 5.09 | – | <1 | 3 | 10 h 10 min |
| Year (annual) | 77°F | 59°F | 68.4°F | 66.11 | – | 79 | 11 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 17°C | 6°C | 11.4°C | 135 mm |
| February | 19°C | 8°C | 13.6°C | 108 mm |
| March | 22°C | 11°C | 16.9°C | 133 mm |
| April | 25°C | 15°C | 19.9°C | 133 mm |
| May | 29°C | 19°C | 23.8°C | 139 mm |
| June | 31°C | 22°C | 26.7°C | 182 mm |
| July | 32°C | 23°C | 27.7°C | 191 mm |
| August | 32°C | 23°C | 27.6°C | 174 mm |
| September | 30°C | 21°C | 25.7°C | 161 mm |
| October | 26°C | 16°C | 21.0°C | 96 mm |
| November | 21°C | 10°C | 15.8°C | 97 mm |
| December | 18°C | 8°C | 12.6°C | 129 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00165926; 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 Marrero?
Normal highs sit between 65°F and 85°F in February, March, April, May, October and November.
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 USC00165926.
When is the last frost in Marrero?
In Marrero, the last spring frost (32°F) comes after February 10 in half of years and after March 10 in one year in ten; the first autumn frost comes before December 12 in half of years and before November 20 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 101 year in 10 after March 10; 9 in 10 after January 9
- First autumn frost, half of years before
- December 121 year in 10 before November 20; 9 in 10 before January 12
NOAA puts the median frost-free season at 306 days, and the season without a hard freeze (28°F) at 340 days.
A hard freeze (28°F) comes after January 27 in half of springs and before January 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Marrero in zone 9b in ZIP code 70072.
Frost dates for every NOAA station in Louisiana · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00165926; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Marrero?
In a normal year in Marrero, 79 days a year reach 90°F and 11 nights fall to 32°F or colder.
- Days at 90°F or more
- 79a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 11a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00165926.
How sunny is Marrero?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Marrero, 4.7 kWh per square metre a day. October is the sunniest month (85%) and February the cloudiest (73%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 75% | 3.0 |
| February | 73% | 3.6 |
| March | 79% | 4.9 |
| April | 81% | 5.8 |
| May | 84% | 6.5 |
| June | 79% | 6.1 |
| July | 75% | 5.6 |
| August | 76% | 5.4 |
| September | 81% | 5.1 |
| October | 85% | 4.5 |
| November | 82% | 3.5 |
| December | 74% | 2.7 |
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 Marrero need?
A normal year in Marrero brings 1,407 heating degree days, 74% fewer than the median U.S. place (5,373), and 2,673 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 6,941 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 399 | 10 |
| February | 261 | 20 |
| March | 143 | 63 |
| April | 45 | 134 |
| May | 3 | 310 |
| June | 0 | 453 |
| July | 0 | 522 |
| August | 0 | 516 |
| September | 1 | 401 |
| October | 35 | 183 |
| November | 181 | 43 |
| December | 339 | 19 |
| Year (annual) | 1,407 | 2,673 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00165926. 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 Marrero's climate compare?
Marrero is warmer than 46 of the other 64 places with their own NOAA record in Louisiana, and wetter than 56. Across the 7,247 U.S. stations with normals, its annual mean of 68.4°F is warmer than 94%.
In the Köppen classification computed from these normals, Marrero 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 Marrero share this climate record?
5 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.
- Estelle, LA16,761 people · 4 mi N
- Woodmere, LA11,775 people · 4 mi NE
- Jean Lafitte, LA1,815 people · 2 mi S
- Barataria, LA688 people · 5 mi S
- Lafitte, LA464 people · 5 mi S
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 Marrero's climate
What is the coldest month in Marrero?
January, with a normal high of 62°F and a normal low of 43°F. The warmest is July (90°F by day, 74°F at night).
What is the rainiest month in Marrero?
July, with 7.53 in of precipitation in a normal year; the driest is October with 3.79 in.
What plant hardiness zone is Marrero in?
The USDA's 2023 map puts Marrero in zone 9b in ZIP code 70072.
How late can frost come in Marrero?
In half of years the last 32°F night comes after February 10; in one year in ten it comes after March 10. Waiting until March 10 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Louisiana climateThe statewide normals and every place in the state
- Terrytown, LA10 miles from this station, 70.3°F a year
- Chalmette, LA14 miles from this station, 69.9°F a year
- New Orleans, LA17 miles from this station, 70.5°F a year
- St Bernard, LA18 miles from this station, 68.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made