Morgan City, Louisiana climate: Normal weather by month, frost dates and records
Morgan City's normal year runs from 45°F January nights to 91°F July afternoons, with 58.5 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 21.2°C, January lows of 7°C, July highs of 33°C, 1,486 mm of precipitation a year.
- NOAA stationMorgan City
- Station IDUSC00166394
- Location29.68°N 91.18°W
- Elevation5 ft (2 m)
- Population10,813
On October 23, the normal high in Morgan City is 79°F and the normal low 61°F, and the chance of measurable rain or snow is 21%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Morgan City.
- Jan 63° 45°
- Feb 67° 49°
- Mar 72° 55°
- Apr 78° 61°
- May 84° 69°
- Jun 89° 75°
- Jul 91° 76°
- Aug 90° 76°
- Sep 88° 73°
- Oct 81° 64°
- Nov 72° 53°
- Dec 66° 48°
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 Morgan City each month?
July is the warmest month, with normal highs of 91°F; January the coldest, with normal lows of 45°F. The most precipitation falls in August (7.27 in), the least in February (3.27 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 63°F | 45°F | 54.2°F | 4.99 | 10 | <1 | 4 | 10 h 30 min |
| February | 67°F | 49°F | 57.7°F | 3.27 | 8 | <1 | 1 | 11 h 10 min |
| March | 72°F | 55°F | 63.2°F | 3.86 | 7 | <1 | 1 | 12 h |
| April | 78°F | 61°F | 69.5°F | 4.02 | 7 | <1 | <1 | 12 h 50 min |
| May | 84°F | 69°F | 76.4°F | 4.55 | 7 | 2 | <1 | 13 h 40 min |
| June | 89°F | 75°F | 81.7°F | 7.02 | 12 | 10 | <1 | 14 h |
| July | 91°F | 76°F | 83.4°F | 6.23 | 14 | 17 | <1 | 13 h 50 min |
| August | 90°F | 76°F | 83.3°F | 7.27 | 15 | 16 | <1 | 13 h 10 min |
| September | 88°F | 73°F | 80.5°F | 5.40 | 11 | 8 | <1 | 12 h 20 min |
| October | 81°F | 64°F | 72.4°F | 4.03 | 7 | 1 | <1 | 11 h 30 min |
| November | 72°F | 53°F | 62.5°F | 3.91 | 7 | <1 | <1 | 10 h 40 min |
| December | 66°F | 48°F | 56.6°F | 3.96 | 8 | <1 | 2 | 10 h 20 min |
| Year (annual) | 78°F | 62°F | 70.1°F | 58.51 | 113 | 53 | 7 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 17°C | 7°C | 12.3°C | 127 mm |
| February | 19°C | 9°C | 14.3°C | 83 mm |
| March | 22°C | 13°C | 17.3°C | 98 mm |
| April | 26°C | 16°C | 20.8°C | 102 mm |
| May | 29°C | 20°C | 24.7°C | 116 mm |
| June | 32°C | 24°C | 27.6°C | 178 mm |
| July | 33°C | 25°C | 28.6°C | 158 mm |
| August | 32°C | 25°C | 28.5°C | 185 mm |
| September | 31°C | 23°C | 26.9°C | 137 mm |
| October | 27°C | 18°C | 22.4°C | 102 mm |
| November | 22°C | 12°C | 16.9°C | 99 mm |
| December | 19°C | 9°C | 13.7°C | 101 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00166394; 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 Morgan City?
Normal highs sit between 65°F and 85°F in February, March, April, May, October, November and December. Of those, October has the fewest days with rain (7).
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 USC00166394.
When is the last frost in Morgan City?
In Morgan City, the last spring frost (32°F) comes after January 30 in half of years and after March 5 in one year in ten; the first autumn frost comes before January 1 in half of years and before December 2 in one year in ten. A night at 32°F or colder comes at all in 80% of years here (NOAA).
- Last spring frost, half of years after
- January 301 year in 10 after March 5; 9 in 10 after December 30
- First autumn frost, half of years before
- January 11 year in 10 before December 2; 9 in 10 before February 2
NOAA puts the median frost-free season at 335 days, and the season without a hard freeze (28°F) at 365 days.
A hard freeze (28°F) comes after January 22 in half of springs and before January 6 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Morgan City in zone 9b in ZIP code 70342, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Morgan City's NOAA station is in zone 9b: the coldest night of a typical year reaches 27°F (22 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 USC00166394; 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 Morgan City?
In a normal year in Morgan City, 53 days a year reach 90°F, 7 nights fall to 32°F or colder and 113 days bring measurable precipitation.
- Days at 90°F or more
- 53a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 7a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 113a normal year
The highest temperature in this station's record (since 1922) is 102°F, on July 6, 1980; the lowest is 10°F, on December 23, 1989.
The wettest calendar year on that record is 1940, with 86.73 in; the snowiest season is 1957–58, with 1.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00166394; records: ACIS (NOAA Regional Climate Centers), station USC00166394. Records use complete months only; a month missing more than three days is left out.
How sunny is Morgan City?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Morgan City, 4.8 kWh per square metre a day. May is the sunniest month (85%) and February the cloudiest (71%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 73% | 3.0 |
| February | 71% | 3.5 |
| March | 78% | 4.8 |
| April | 81% | 5.8 |
| May | 85% | 6.5 |
| June | 83% | 6.4 |
| July | 78% | 5.9 |
| August | 79% | 5.5 |
| September | 82% | 5.2 |
| October | 85% | 4.6 |
| November | 82% | 3.5 |
| December | 73% | 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 Morgan City need?
A normal year in Morgan City brings 1,172 heating degree days, 78% fewer than the median U.S. place (5,373), and 3,064 cooling degree days, 3.4 times the median (908). One month needs 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 7,501 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 349 | 14 |
| February | 229 | 24 |
| March | 124 | 68 |
| April | 29 | 164 |
| May | 2 | 355 |
| June | 0 | 502 |
| July | 0 | 570 |
| August | 0 | 567 |
| September | 0 | 464 |
| October | 19 | 248 |
| November | 136 | 61 |
| December | 285 | 27 |
| Year (annual) | 1,172 | 3,064 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00166394. 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 Morgan City been warmer than normal lately?
Over 52 complete years from 1926 to 2017, the station's annual mean temperature rose at a fitted 1.2°F per century (+0.07°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Morgan City's climate compare?
Morgan City is warmer than 59 of the other 64 places with their own NOAA record in Louisiana, and wetter than 20. Across the 7,247 U.S. stations with normals, its annual mean of 70.1°F is warmer than 95%.
In the Köppen classification computed from these normals, Morgan City 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 Morgan City 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.
- Patterson, LA5,614 people · 8 mi W
- Berwick, LA4,495 people · 4 mi W
- Bayou Vista, LA3,931 people · 5 mi W
- Bayou L'Ourse, LA2,197 people · 7 mi E
- Amelia, LA2,161 people · 4 mi E
- Siracusaville, LA498 people · 2 mi E
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 Morgan City's climate
What is the coldest month in Morgan City?
January, with a normal high of 63°F and a normal low of 45°F. The warmest is July (91°F by day, 76°F at night).
Does it snow in Morgan City?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month in Morgan City?
August, with 7.27 in of precipitation in a normal year; the driest is February with 3.27 in.
What plant hardiness zone is Morgan City in?
The USDA's 2023 map puts Morgan City in zone 9b in ZIP code 70342, the nearest ZIP area. By the same method at Morgan City's NOAA station, the coldest night of a typical year reaches 27°F (22 years, 1991-2020): zone 9b.
How late can frost come in Morgan City?
In half of years the last 32°F night comes after January 30; in one year in ten it comes after March 5. Waiting until March 5 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Louisiana climateThe statewide normals and every place in the state
- Houma, LA22 miles from this station, 69.6°F a year
- Salt Point, LA22 miles from this station, 69.9°F a year
- Franklin, LA24 miles from this station, 68.8°F a year
- Thibodaux, LA25 miles from this station, 70.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made