Marrero, LA Climate: Temperature & Rain by Month
Annual temperature and rainfall from NOAA NCEI's 1991–2020 normals →; comfort score computed by PlainClimate
30-year climate normals (1991-2020) from Marrero's primary NOAA station, MARRERO 9 SSW.
The climate verdict for Marrero
Water is the standout signal in Marrero, Louisiana: 66.1 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 68°F. It scores 76/100 for climate comfort (good), putting it in the top third of station-mapped location scores and exceeding 69% of them.
- 68°F
- average temperature, NOAA 1991-2020 normal
- 76/100
- comfort score, above 69% of station-mapped location scores
- 66.1"
- precipitation, annual total
- 305 days
- growing season, frost-free days
Marrero: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00165926 · Marrero, LA 68°F mean · 66.1" precip
TEMP-MILD · RANK-WARM · PHOTO-FINISH · PRCP-WET · SWING-NARROW · COMF-TOP · LOAD-MIX · STN-1 · BOOK-FULL
- TEMP-MILD 68°F
- RANK-WARM #6,381
- PHOTO-FINISH ≈ Austin Bergstrom
- PRCP-WET 66.1"
- SWING-NARROW 29°F
- COMF-TOP 76/100
- LOAD-MIX H/C balanced
- STN-1 USC00165926
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Austin Bergstrom, TX (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every LA station list.
- Marrero (this station) 68°F
- Hot Sapelo Island, GA 68°F
- Near Austin Bergstrom, TX 68°F
- Near Green Valley, AZ 68°F
- Near Gulfport Naval…, MS 68°F
Marrero sits in Louisiana, the #3 hottest U.S. state at 67.3°F statewide annual average - see all 50 hottest states ranked by NOAA normals
Climate Living Index · Marrero
Marrero: 78/100 · grade B
Marrero publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Marrero, not an official NOAA rating. Rankings still use Comfort Score 76/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 305 days/year | 100/100 · A |
| Normal heat + freeze calendar | 21 calendar days | 98/100 · A |
| Annual temperature balance | 68.4°F · 0.9° from 67.5°F | 96/100 · A |
| Precipitation balance | 66.1 in · 31.1 from 35 in | 0/100 · F |
Marrero · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Marrero is a temperate Köppen climate: Cfa
Coldest-month mean 52.5°F and warmest-month mean 81.8°F place this station in temperate, no dry season, hot summer climates (Cfa). Class Cfa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, no dry season, hot summer.
- Köppen code
- Cfa
- Group
- Temperate
- Warmest month
- 81.8°F
- Coldest month
- 52.5°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · balanced station
Where Marrero sits across the climate record
Three NOAA fields for Marrero's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Top 7% warmest
- Among 6,861 stations, Marrero sits in the warmer third of annual means.
- Annual precipitation
- Top 3% wettest
- Marrero's annual total ranks in the wetter third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 91%
- Warmest-to-coldest month gap for Marrero is compact versus 6,861 complete station-years.
How Marrero compares across U.S. station-mapped locations
Marrero's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
76 Top 31% score exceeds 69% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). Below this entry.
- 70–80: 650 station-mapped locations (11%). This entry sits in this band.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 62°F (17°C) | 43°F (6°C) | 53°F (11°C) | 5.3" | 5.8 | 0.0 |
| February | 66°F (19°C) | 47°F (8°C) | 56°F (14°C) | 4.2" | 1.6 | 0.0 |
| March | 72°F (22°C) | 53°F (11°C) | 62°F (17°C) | 5.2" | 0.7 | 0.1 |
| April | 78°F (25°C) | 58°F (15°C) | 68°F (20°C) | 5.3" | 0.0 | 0.0 |
| May | 84°F (29°C) | 66°F (19°C) | 75°F (24°C) | 5.5" | 0.0 | 4.9 |
| June | 89°F (31°C) | 72°F (22°C) | 80°F (27°C) | 7.2" | 0.0 | 17.8 |
| July | 90°F (32°C) | 74°F (23°C) | 82°F (28°C) | 7.5" | 0.0 | 22.5 |
| August | 90°F (32°C) | 74°F (23°C) | 82°F (28°C) | 6.9" | 0.0 | 21.6 |
| September | 87°F (30°C) | 70°F (21°C) | 78°F (26°C) | 6.3" | 0.0 | 11.2 |
| October | 79°F (26°C) | 61°F (16°C) | 70°F (21°C) | 3.8" | 0.0 | 1.0 |
| November | 70°F (21°C) | 51°F (10°C) | 60°F (16°C) | 3.8" | 0.5 | 0.0 |
| December | 64°F (18°C) | 46°F (8°C) | 55°F (13°C) | 5.1" | 2.6 | 0.0 |
The year, day by day
The year in Marrero runs from a mild 43°F around January 13 to 90°F at the peak near July 16, and the normal low never reaches freezing on any date in the record.
When the heat sits
Normal highs reach 90°F from July 16 through August 5, covering 21 dates. The broader mild season, normal highs of 70°F or more, runs March 4 to November 15.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
No freezing date
Not one calendar date in the 1991–2020 record carries a normal low at or below 32°F. The coldest normal low of the year is 43°F around January 13.
The widest day
March 18 carries the biggest normal gap between afternoon and dawn, 20°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Marrero.
Where Marrero Stands Nationally
This is one of the wettest normals climates ranked: about 66 inches of precipitation in a normal year, a total fewer than one station in ten surpasses.
Among the steadiest day-night climates ranked: even the widest normal daily swing holds to roughly 20°F.
Marrero earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
Marrero spreads its precipitation across the year
Neither half of the year dominates here: June through August take 33% of the annual total and December through February 22%, with neither reaching the 35% that would mark a distinct wet season. Marrero has no dry season to plan around, though it does carry an unusually narrow 29.3°F seasonal spread.
The gap between the wettest and driest month still matters: July averages 7.5" and October 3.8". The three wettest months together take 33% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
Frost Dates & Growing Season
First Fall Freeze
December 12
50% probability date
Last Spring Freeze
February 10
50% probability date
Growing Season
305 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
1,407
Higher = more heating needed
Cooling Degree Days
2,673
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside LA closest to Marrero on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (68°F here).
- Green Valley, AZ 68°F · 0.0°F off
- Tallahassee, FL 68°F · 0.0°F off
- Trona, CA 68°F · 0.0°F off
- Yucca, AZ 68°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (66.1" here), excluding temperature-peer places.
- Haleyville, AL 66.1" · 0.0" off
- Palm Beach Gardens, FL 66.0" · 0.1" off
- Hoonah, AK 65.8" · 0.3" off
- Fairhope, AL 65.8" · 0.3" off
Data-derived climate profile
How Marrero's climate pattern fits together
mixed demand · wet · low swing
Water is prominent even though neither heating nor cooling wholly defines the record. Marrero averages 66.1 inches of precipitation a year. Snowfall is not added to the interpretation because its annual value is missing. The monthly table supplies the seasonal distribution hidden by that annual total.
Marrero's 29.3°F seasonal spread is compact even though precipitation is abundant. July and January mark the typical warm and cold ends of the calendar. The annual average is 68°F. Temperature is relatively steady; the monthly rows show how rain and snow observations vary across the calendar.
Marrero combines a compact 29.3°F annual temperature range with meaningful demand on both sides of the thermostat: 1,407 heating and 2,673 cooling degree days. The balance matters more here than either annual total in isolation.
The frost-free window extends for about 305 days. That is a long calendar measure, but it is not a forecast and does not combine heat, rainfall, soil, or local elevation into a planting recommendation.
These labels group NOAA 1991-2020 normals from Marrero's primary station, where heating and cooling demand are close enough that neither season sets the character on its own. On a balanced station like Marrero, the bands are descriptive ranges rather than an official NOAA classification or a forecast.
Questions about Marrero's climate
How much rain does Marrero get? ▼
How many days above 90°F does Marrero get? ▼
How much energy does heating and cooling require in Marrero? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Marrero's primary station: MARRERO 9 SSW (USC00165926). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as a census-designated place (GEOID 2248785), not an incorporated municipality. Match rule for Marrero: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Marrero comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.