Monroe, Louisiana climate: Normal weather by month, frost dates and records
Monroe's normal year runs from 37°F January nights to 93°F July afternoons, with 55.1 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 18.7°C, January lows of 3°C, July highs of 34°C, 1,400 mm of precipitation a year.
- NOAA stationMonroe Regional Airport
- Station IDUSW00013942
- Location32.52°N 92.04°W
- Elevation79 ft (24 m)
- From the center2 miles
- Population46,622
On October 23, the normal high in Monroe is 76°F and the normal low 51°F, and the chance of measurable rain or snow is 25%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Monroe.
- Jan 57° 37°
- Feb 61° 40°
- Mar 69° 47°
- Apr 77° 54°
- May 84° 63°
- Jun 91° 70°
- Jul 93° 73°
- Aug 94° 71°
- Sep 89° 66°
- Oct 79° 54°
- Nov 67° 44°
- Dec 59° 39°
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 Monroe each month?
July is the warmest month, with normal highs of 93°F; January the coldest, with normal lows of 37°F. The most precipitation falls in April (5.83 in), the least in September (3.55 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 57°F | 37°F | 46.8°F | 5.15 | 10 | <1 | 11 | 10 h 10 min |
| February | 61°F | 40°F | 50.7°F | 4.65 | 10 | <1 | 7 | 11 h |
| March | 69°F | 47°F | 58.1°F | 5.21 | 10 | <1 | 2 | 12 h |
| April | 77°F | 54°F | 65.5°F | 5.83 | 8 | <1 | <1 | 13 h |
| May | 84°F | 63°F | 73.8°F | 4.43 | 10 | 7 | <1 | 13 h 50 min |
| June | 91°F | 70°F | 80.3°F | 4.45 | 9 | 20 | <1 | 14 h 20 min |
| July | 93°F | 73°F | 82.8°F | 3.94 | 9 | 26 | <1 | 14 h 10 min |
| August | 94°F | 71°F | 82.5°F | 3.56 | 8 | 26 | <1 | 13 h 20 min |
| September | 89°F | 66°F | 77.1°F | 3.55 | 7 | 15 | <1 | 12 h 20 min |
| October | 79°F | 54°F | 66.3°F | 4.95 | 8 | 3 | <1 | 11 h 30 min |
| November | 67°F | 44°F | 55.6°F | 4.16 | 8 | <1 | 4 | 10 h 30 min |
| December | 59°F | 39°F | 48.8°F | 5.22 | 10 | <1 | 10 | 10 h |
| Year (annual) | 77°F | 55°F | 65.7°F | 55.10 | 106 | 97 | 33 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 14°C | 3°C | 8.2°C | 131 mm |
| February | 16°C | 5°C | 10.4°C | 118 mm |
| March | 21°C | 8°C | 14.5°C | 132 mm |
| April | 25°C | 12°C | 18.6°C | 148 mm |
| May | 29°C | 17°C | 23.2°C | 113 mm |
| June | 33°C | 21°C | 26.8°C | 113 mm |
| July | 34°C | 23°C | 28.2°C | 100 mm |
| August | 34°C | 22°C | 28.1°C | 90 mm |
| September | 32°C | 19°C | 25.1°C | 90 mm |
| October | 26°C | 12°C | 19.1°C | 126 mm |
| November | 20°C | 7°C | 13.1°C | 106 mm |
| December | 15°C | 4°C | 9.3°C | 133 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. Monroe's own co-op station Monroe Delta Cc does: 1 inches of snow in a normal year (see the other stations below).
Source: NOAA NCEI 1991-2020 monthly normals, station USW00013942; 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 Monroe?
Normal highs sit between 65°F and 85°F in March, April, May, October and November. Of those, October has the fewest days with rain (8).
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 USW00013942.
When is the last frost in Monroe?
In Monroe, the last spring frost (32°F) comes after March 8 in half of years and after March 25 in one year in ten; the first autumn frost comes before November 15 in half of years and before November 1 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
- March 81 year in 10 after March 25; 9 in 10 after February 16
- First autumn frost, half of years before
- November 151 year in 10 before November 1; 9 in 10 before December 3
NOAA puts the median frost-free season at 253 days, and the season without a hard freeze (28°F) at 283 days.
A hard freeze (28°F) comes after February 23 in half of springs and before November 29 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Monroe in zone 8b across its 2 ZIP code areas (8b in 71203, the largest). By the map's own method, the average of each year's coldest night over 1991-2020, Monroe's NOAA station is in zone 8b: the coldest night of a typical year reaches 20°F (30 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 USW00013942; 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.
What hardiness zone is each Monroe ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Monroe's 2 ZIP code areas are all in zone 8b. Each ZIP's frost dates are in the frost tool.
Source: USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; ZIP areas in the place: Census Bureau 2020 ZCTA-to-place relationship file. A ZIP area counts when at least a tenth of its land (and 0.5 km²) lies in the place.
How hot and how cold does it get in Monroe?
In a normal year in Monroe, 97 days a year reach 90°F (7 of them 100°F or more), 33 nights fall to 32°F or colder and 106 days bring measurable precipitation.
- Days at 90°F or more
- 97a normal year
- Days at 100°F or more
- 7a normal year
- Nights at 32°F or colder
- 33a normal year
- Days that stay below freezing
- 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 106a normal year
The highest temperature in Monroe's official record (kept by the National Weather Service since 1893) is 109°F, on July 26, 1918; the lowest is −2°F, on February 2, 1951.
The wettest calendar year on that record is 1991, with 78.64 in; the snowiest season is 1948–49, with 9.2 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USW00013942; records: ACIS (NOAA Regional Climate Centers), NWS threaded record MLUthr. Records use complete months only; a month missing more than three days is left out.
How humid and windy is Monroe, and how clear are its skies?
The summer (June-August) dew point averages 71°F. The muggiest month is July, with an average dew point of 72°F, above the 65°F at which most people call the air sticky; the driest air comes in December (38°F). February is the windiest month (7.9 mph on average), and September has the most clear or nearly clear hours (78%).
| Month | Dew point | Humidity | Afternoon humidity | Wind | Clear or few clouds | Overcast |
|---|---|---|---|---|---|---|
| January | 38°F | 70% | 50% | 7.0 mph | 56% | 34% |
| February | 43°F | 68% | 49% | 7.9 mph | 55% | 33% |
| March | 51°F | 69% | 50% | 7.6 mph | 57% | 28% |
| April | 59°F | 71% | 49% | 7.0 mph | 64% | 20% |
| May | 68°F | 74% | 53% | 5.8 mph | 65% | 15% |
| June | 72°F | 75% | 55% | 5.0 mph | 73% | 9% |
| July | 72°F | 74% | 52% | 4.6 mph | 77% | 7% |
| August | 70°F | 73% | 50% | 4.8 mph | 74% | 9% |
| September | 61°F | 70% | 44% | 5.3 mph | 78% | 11% |
| October | 51°F | 74% | 48% | 5.4 mph | 68% | 21% |
| November | 43°F | 73% | 51% | 6.3 mph | 61% | 28% |
| December | 38°F | 73% | 55% | 6.9 mph | 57% | 33% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013942. Monthly averages of all hours; afternoon humidity at 3 p.m. local standard time; sky as the share of hours NOAA's observations rate clear or few clouds (a dash where NOAA publishes no sky value).
How sunny is Monroe?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Monroe, 4.6 kWh per square metre a day. August is the sunniest month (83%) and February the cloudiest (64%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 70% | 2.7 |
| February | 64% | 3.1 |
| March | 71% | 4.3 |
| April | 76% | 5.4 |
| May | 79% | 6.0 |
| June | 82% | 6.4 |
| July | 82% | 6.2 |
| August | 83% | 5.8 |
| September | 82% | 5.1 |
| October | 80% | 4.1 |
| November | 76% | 3.1 |
| December | 69% | 2.4 |
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 Monroe need?
A normal year in Monroe brings 2,213 heating degree days, 59% fewer than the median U.S. place (5,373), and 2,495 cooling degree days, 2.7 times the median (908). Four months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 6,264 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 566 | 4 |
| February | 410 | 8 |
| March | 246 | 34 |
| April | 83 | 98 |
| May | 9 | 280 |
| June | 0 | 459 |
| July | 0 | 553 |
| August | 0 | 542 |
| September | 3 | 366 |
| October | 84 | 123 |
| November | 302 | 20 |
| December | 510 | 8 |
| Year (annual) | 2,213 | 2,495 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00013942. 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.
Has Monroe been warmer than normal lately?
2025 averaged 68.3°F, 2.6°F above the 1991-2020 normal of 65.7°F. 4 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 66.7°F | +1.0°F | 45.77 |
| 2023 | 68.8°F | +3.1°F | 39.70 |
| 2024 | 68.8°F | +3.0°F | 64.48 |
| 2025 | 68.3°F | +2.6°F | 48.07 |
Over 83 complete years from 1930 to 2025, the station's annual mean temperature rose at a fitted 1.5°F per century (+0.08°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USW00013942; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Monroe's climate compare?
Monroe is warmer than 20 of the other 64 places with their own NOAA record in Louisiana, and wetter than 7. Across the 7,247 U.S. stations with normals, its annual mean of 65.7°F is warmer than 89%.
In the Köppen classification computed from these normals, Monroe 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 Monroe share this climate record?
6 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.
- West Monroe, LA12,476 people · 6 mi W
- Swartz, LA4,691 people · 5 mi NE
- Brownsville, LA3,996 people · 7 mi W
- Richwood, LA3,809 people · 5 mi SW
- Lakeshore, LA3,111 people · 1 mi N
- Bawcomville, LA2,635 people · 8 mi SW
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Monroe's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Monroe. This page uses Monroe Regional Airport; the other differs by site and elevation:
| Station | From the center | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Monroe Delta Cc USC00166314 | 3 mi SE | 70 ft | 65.3°F | 35°F | 94°F | 56.5 | 1 | March 9 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Monroe's climate
What is the coldest month in Monroe?
January, with a normal high of 57°F and a normal low of 37°F. The warmest is July (93°F by day, 73°F at night).
Does it snow in Monroe?
Rarely. NOAA publishes no 1991-2020 snowfall normal for Monroe's NOAA station; Monroe's own co-op station Monroe Delta Cc records 1 inches of snow in a normal year.
What is the rainiest month in Monroe?
April, with 5.83 in of precipitation in a normal year; the driest is September with 3.55 in.
What plant hardiness zone is Monroe in?
The USDA's 2023 map puts Monroe in zone 8b across its 2 ZIP code areas (8b in 71203, the largest). By the same method at Monroe's NOAA station, the coldest night of a typical year reaches 20°F (30 years, 1991-2020): zone 8b.
How late can frost come in Monroe?
In half of years the last 32°F night comes after March 8; in one year in ten it comes after March 25. Waiting until March 25 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Monroe in OctoberThis month day by day, its records and recent years
- Louisiana climateThe statewide normals and every place in the state
- Bastrop, LA17 miles from this station, 63.3°F a year
- Rayville, LA17 miles from this station, 66.6°F a year
- Calhoun, LA18 miles from this station, 63.8°F a year
- Columbia, LA24 miles from this station, 65.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made