Lake Arthur, Louisiana climate: Normal weather by month, frost dates and records
Lake Arthur's normal year runs from 44°F January nights to 91°F July afternoons, with 59.9 inches of precipitation and less than an inch of snow (0.1 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 20.6°C, January lows of 6°C, July highs of 33°C, 1,521 mm of precipitation a year.
- NOAA stationLake Arthur (7 mi SW)
- Station IDUSC00165065
- Location30.02°N 92.77°W
- Elevation11 ft (3 m)
- Population2,564
On October 23, the normal high in Lake Arthur is 79°F and the normal low 58°F, and the chance of measurable rain or snow is 31%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Lake Arthur.
- Jan 61° 44°
- Feb 66° 47°
- Mar 72° 53°
- Apr 78° 60°
- May 84° 68°
- Jun 90° 73°
- Jul 91° 75°
- Aug 92° 74°
- Sep 89° 70°
- Oct 81° 61°
- Nov 71° 51°
- Dec 63° 45°
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 Lake Arthur each month?
July is the warmest month, with normal highs of 91°F; January the coldest, with normal lows of 44°F. The most precipitation falls in June (6.17 in), the least in March (3.10 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 61°F | 44°F | 52.4°F | 5.61 | 12 | <1 | 5 | 10 h 20 min |
| February | 66°F | 47°F | 56.2°F | 4.20 | 11 | <1 | 2 | 11 h 10 min |
| March | 72°F | 53°F | 62.4°F | 3.10 | 10 | <1 | 1 | 12 h |
| April | 78°F | 60°F | 68.6°F | 4.75 | 8 | <1 | <1 | 12 h 50 min |
| May | 84°F | 68°F | 75.7°F | 4.61 | 7 | 4 | <1 | 13 h 40 min |
| June | 90°F | 73°F | 81.7°F | 6.17 | 12 | 16 | <1 | 14 h |
| July | 91°F | 75°F | 83.2°F | 4.99 | 13 | 23 | <1 | 13 h 50 min |
| August | 92°F | 74°F | 83.1°F | 6.08 | 13 | 24 | <1 | 13 h 20 min |
| September | 89°F | 70°F | 79.3°F | 5.85 | 11 | 14 | <1 | 12 h 20 min |
| October | 81°F | 61°F | 70.7°F | 4.51 | 9 | 2 | <1 | 11 h 30 min |
| November | 71°F | 51°F | 61.0°F | 5.25 | 10 | <1 | <1 | 10 h 40 min |
| December | 63°F | 45°F | 54.1°F | 4.78 | 13 | <1 | 3 | 10 h 10 min |
| Year (annual) | 78°F | 60°F | 69.0°F | 59.90 | 130 | 82 | 10 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 16°C | 6°C | 11.3°C | 142 mm |
| February | 19°C | 8°C | 13.4°C | 107 mm |
| March | 22°C | 12°C | 16.9°C | 79 mm |
| April | 25°C | 15°C | 20.3°C | 121 mm |
| May | 29°C | 20°C | 24.3°C | 117 mm |
| June | 32°C | 23°C | 27.6°C | 157 mm |
| July | 33°C | 24°C | 28.4°C | 127 mm |
| August | 33°C | 23°C | 28.4°C | 154 mm |
| September | 32°C | 21°C | 26.3°C | 149 mm |
| October | 27°C | 16°C | 21.5°C | 115 mm |
| November | 22°C | 10°C | 16.1°C | 133 mm |
| December | 17°C | 7°C | 12.3°C | 121 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00165065; 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 Lake Arthur?
Normal highs sit between 65°F and 85°F in February, March, April, May, October and November. Of those, May 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 USC00165065.
When is the last frost in Lake Arthur?
In Lake Arthur, the last spring frost (32°F) comes after February 10 in half of years and after March 8 in one year in ten; the first autumn frost comes before December 11 in half of years and before November 19 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 8; 9 in 10 after January 10
- First autumn frost, half of years before
- December 111 year in 10 before November 19; 9 in 10 before January 15
NOAA puts the median frost-free season at 307 days, and the season without a hard freeze (28°F) at 341 days.
A hard freeze (28°F) comes after January 25 in half of springs and before January 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Lake Arthur in zone 9a in ZIP code 70542, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Lake Arthur's NOAA station is in zone 9b: the coldest night of a typical year reaches 26°F (16 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Louisiana · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00165065; 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 Lake Arthur?
In a normal year in Lake Arthur, 82 days a year reach 90°F (1 of them 100°F or more), 10 nights fall to 32°F or colder and 130 days bring measurable precipitation.
- Days at 90°F or more
- 82a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 10a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 130a normal year
The highest temperature in this station's record (since 1901) is 106°F, on August 28, 2023; the lowest is 11°F, on February 1, 1951.
The wettest calendar year on that record is 2016, with 78.68 in; the snowiest season is 2024–25, with 7.8 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00165065; records: ACIS (NOAA Regional Climate Centers), station USC00165065. Records use complete months only; a month missing more than three days is left out.
How sunny is Lake Arthur?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Lake Arthur, 4.6 kWh per square metre a day. October is the sunniest month (82%) and February the cloudiest (66%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 70% | 2.9 |
| February | 66% | 3.3 |
| March | 73% | 4.5 |
| April | 77% | 5.5 |
| May | 80% | 6.1 |
| June | 79% | 6.1 |
| July | 79% | 5.9 |
| August | 80% | 5.6 |
| September | 81% | 5.1 |
| October | 82% | 4.4 |
| November | 79% | 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 Lake Arthur need?
A normal year in Lake Arthur brings 1,394 heating degree days, 74% fewer than the median U.S. place (5,373), and 2,892 cooling degree days, 3.2 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 7,182 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 398 | 9 |
| February | 264 | 16 |
| March | 138 | 59 |
| April | 39 | 147 |
| May | 3 | 337 |
| June | 0 | 499 |
| July | 0 | 563 |
| August | 0 | 561 |
| September | 1 | 430 |
| October | 29 | 207 |
| November | 169 | 48 |
| December | 353 | 17 |
| Year (annual) | 1,394 | 2,892 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00165065. 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 Lake Arthur been warmer than normal lately?
2025 averaged 69.7°F, 0.7°F above the 1991-2020 normal of 69.0°F. 3 of the 4 complete years since 2022 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2022 | 69.0°F | at normal | 44.82 |
| 2023 | 71.1°F | +2.1°F | 45.83 |
| 2024 | 70.4°F | +1.4°F | 58.76 |
| 2025 | 69.7°F | +0.7°F | 59.76 |
Over 60 complete years from 1904 to 2025, the station's annual mean temperature rose at a fitted 1.4°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 USC00165065; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Lake Arthur's climate compare?
Lake Arthur is warmer than 50 of the other 64 places with their own NOAA record in Louisiana, and wetter than 30. Across the 7,247 U.S. stations with normals, its annual mean of 69.0°F is warmer than 94%.
In the Köppen classification computed from these normals, Lake Arthur 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 Lake Arthur share this climate record?
Hayes has no NOAA station with 1991-2020 normals of its 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.
- Hayes, LA269 people · 11 mi NW
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 Lake Arthur's climate
What is the coldest month in Lake Arthur?
January, with a normal high of 61°F and a normal low of 44°F. The warmest is July (91°F by day, 75°F at night).
Does it snow in Lake Arthur?
Rarely: NOAA's normal is 0.1 inch a year.
What is the rainiest month in Lake Arthur?
June, with 6.17 in of precipitation in a normal year; the driest is March with 3.10 in.
What plant hardiness zone is Lake Arthur in?
The USDA's 2023 map puts Lake Arthur in zone 9a in ZIP code 70542, the nearest ZIP area. By the same method at Lake Arthur's NOAA station, the coldest night of a typical year reaches 26°F (16 years, 1991-2020): zone 9b.
How late can frost come in Lake Arthur?
In half of years the last 32°F night comes after February 10; in one year in ten it comes after March 8. Waiting until March 8 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Louisiana climateThe statewide normals and every place in the state
- Jennings, LA14 miles from this station, 67.8°F a year
- Rockefeller Wildlife Refuge, LA21 miles from this station, 69.6°F a year
- Lake Charles, LA28 miles from this station, 69.7°F a year
- Crowley, LA29 miles from this station, 68.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made