Leland Bowman Lock, Louisiana climate: Climate normals at a NOAA weather station
Leland Bowman Lock's normal year runs from 41°F January nights to 90°F July afternoons, with 64.1 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 19.6°C, January lows of 5°C, July highs of 32°C, 1,628 mm of precipitation a year.
- NOAA stationLeland Bowman Lock
- Station IDUSC00165296
- Location29.79°N 92.20°W
- Elevation40 ft (12 m)
On October 23, the normal high in Leland Bowman Lock is 77°F and the normal low 56°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 Leland Bowman Lock.
- Jan 60° 41°
- Feb 63° 45°
- Mar 69° 51°
- Apr 75° 58°
- May 82° 66°
- Jun 88° 72°
- Jul 90° 73°
- Aug 90° 73°
- Sep 87° 69°
- Oct 80° 59°
- Nov 69° 49°
- Dec 62° 43°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Leland Bowman Lock each month?
July is the warmest month, with normal highs of 90°F; January the coldest, with normal lows of 41°F. The most precipitation falls in July (8.09 in), the least in March (3.60 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 60°F | 41°F | 50.2°F | 5.43 | 10 | <1 | 5 | 10 h 30 min |
| February | 63°F | 45°F | 54.0°F | 4.02 | 7 | <1 | 1 | 11 h 10 min |
| March | 69°F | 51°F | 60.3°F | 3.60 | 7 | <1 | 1 | 12 h |
| April | 75°F | 58°F | 66.5°F | 5.47 | 6 | <1 | <1 | 12 h 50 min |
| May | 82°F | 66°F | 74.1°F | 4.27 | 6 | 3 | <1 | 13 h 40 min |
| June | 88°F | 72°F | 79.8°F | 6.91 | 11 | 12 | <1 | 14 h |
| July | 90°F | 73°F | 81.5°F | 8.09 | 13 | 20 | <1 | 13 h 50 min |
| August | 90°F | 73°F | 81.4°F | 6.76 | 13 | 22 | <1 | 13 h 20 min |
| September | 87°F | 69°F | 77.8°F | 6.27 | 9 | 13 | <1 | 12 h 20 min |
| October | 80°F | 59°F | 69.0°F | 4.18 | 6 | 2 | <1 | 11 h 30 min |
| November | 69°F | 49°F | 59.1°F | 4.72 | 7 | <1 | 1 | 10 h 40 min |
| December | 62°F | 43°F | 52.6°F | 4.37 | 9 | <1 | 2 | 10 h 10 min |
| Year (annual) | 76°F | 58°F | 67.2°F | 64.09 | 102 | 73 | 10 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 15°C | 5°C | 10.1°C | 138 mm |
| February | 17°C | 7°C | 12.2°C | 102 mm |
| March | 21°C | 11°C | 15.7°C | 91 mm |
| April | 24°C | 14°C | 19.2°C | 139 mm |
| May | 28°C | 19°C | 23.4°C | 108 mm |
| June | 31°C | 22°C | 26.6°C | 176 mm |
| July | 32°C | 23°C | 27.5°C | 205 mm |
| August | 32°C | 23°C | 27.4°C | 172 mm |
| September | 30°C | 20°C | 25.4°C | 159 mm |
| October | 26°C | 15°C | 20.6°C | 106 mm |
| November | 21°C | 9°C | 15.1°C | 120 mm |
| December | 17°C | 6°C | 11.4°C | 111 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00165296; 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.
Which months are mildest at Leland Bowman Lock?
Normal highs sit between 65°F and 85°F in March, April, May, October and November. Of those, April has the fewest days with rain (6).
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 USC00165296.
When is the last frost at Leland Bowman Lock?
In Leland Bowman Lock, the last spring frost (32°F) comes after February 17 in half of years and after March 13 in one year in ten; the first autumn frost comes before December 5 in half of years and before November 13 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 171 year in 10 after March 13; 9 in 10 after January 19
- First autumn frost, half of years before
- December 51 year in 10 before November 13; 9 in 10 before January 4
NOAA puts the median frost-free season at 298 days, and the season without a hard freeze (28°F) at 331 days.
A hard freeze (28°F) comes after January 29 in half of springs and before December 25 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Leland Bowman Lock in zone 9a in ZIP code 70510, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 9b: the coldest night of a typical year reaches 25°F (19 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 USC00165296; 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 at Leland Bowman Lock?
In a normal year in Leland Bowman Lock, 73 days a year reach 90°F (1 of them 100°F or more), 10 nights fall to 32°F or colder and 102 days bring measurable precipitation.
- Days at 90°F or more
- 73a 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
- 102a normal year
The highest temperature in this station's record (since 1951) is 112°F, on August 19, 2011; the lowest is 11°F, on January 12, 1982.
The wettest calendar year on that record is 2018, with 93.41 in; the snowiest season is 2024–25, with 7.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00165296; records: ACIS (NOAA Regional Climate Centers), station USC00165296. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Leland Bowman Lock?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds at Leland Bowman Lock, 4.8 kWh per square metre a day. May is the sunniest month (86%) and February the cloudiest (70%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 73% | 3.0 |
| February | 70% | 3.5 |
| March | 78% | 4.8 |
| April | 81% | 5.8 |
| May | 86% | 6.6 |
| June | 84% | 6.5 |
| July | 80% | 6.0 |
| August | 81% | 5.7 |
| September | 82% | 5.2 |
| October | 86% | 4.6 |
| November | 82% | 3.5 |
| December | 72% | 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 many heating and cooling degree days does Leland Bowman Lock record?
A normal year at Leland Bowman Lock brings 1,668 heating degree days, 69% fewer than the median U.S. place (5,373), and 2,492 cooling degree days, 2.7 times the median (908). Three months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 6,576 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 462 | 3 |
| February | 313 | 7 |
| March | 179 | 34 |
| April | 60 | 104 |
| May | 5 | 285 |
| June | 0 | 444 |
| July | 0 | 510 |
| August | 0 | 510 |
| September | 1 | 385 |
| October | 43 | 167 |
| November | 210 | 33 |
| December | 396 | 10 |
| Year (annual) | 1,668 | 2,492 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00165296. 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 Leland Bowman Lock's climate compare?
Leland Bowman Lock is warmer than 33 of the 65 places with their own NOAA record in Louisiana, and wetter than 50. Across the 7,247 U.S. stations with normals, its annual mean of 67.2°F is warmer than 92%.
In the Köppen classification computed from these normals, Leland Bowman Lock 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 Leland Bowman Lock share this climate record?
3 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.
- Abbeville, LA10,902 people · 14 mi N
- Kaplan, LA4,164 people · 16 mi N
- Perry, LA1,014 people · 12 mi N
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 Leland Bowman Lock's climate
What is the coldest month at Leland Bowman Lock?
January, with a normal high of 60°F and a normal low of 41°F. The warmest is July (90°F by day, 73°F at night).
Does it snow at Leland Bowman Lock?
Rarely: NOAA's normal is 0.1 inch a year.
What is the rainiest month at Leland Bowman Lock?
July, with 8.09 in of precipitation in a normal year; the driest is March with 3.60 in.
What plant hardiness zone is Leland Bowman Lock in?
The USDA's 2023 map puts Leland Bowman Lock in zone 9a in ZIP code 70510, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 25°F (19 years, 1991-2020): zone 9b.
How late can frost come at Leland Bowman Lock?
In half of years the last 32°F night comes after February 17; in one year in ten it comes after March 13. Waiting until March 13 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Louisiana climateThe statewide normals and every place in the state
- New Iberia, LA26 miles from this station, 69.2°F a year
- St. Martinville, LA29 miles from this station, 67.9°F a year
- Lafayette, LA32 miles from this station, 69.4°F a year
- Jeanerette, LA32 miles from this station, 67.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made