St Bernard, Louisiana climate: Climate normals at a NOAA weather station
St Bernard's normal year runs from 44°F January nights to 89°F August afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 20.3°C, January lows of 7°C, August highs of 32°C.
- NOAA stationSt Bernard
- Station IDUSC00168108
- Location29.87°N 89.83°W
- Elevation5 ft (2 m)
On October 22, the normal high in St Bernard is 77°F and the normal low 60°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for St Bernard.
- Jan 62° 44°
- Feb 65° 47°
- Mar 71° 53°
- Apr 77° 60°
- May 84° 68°
- Jun 87° 73°
- Jul 89° 75°
- Aug 89° 75°
- Sep 86° 71°
- Oct 79° 62°
- Nov 70° 51°
- Dec 64° 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 at St Bernard each month?
August is the warmest month, with normal highs of 89°F; January the coldest, with normal lows of 44°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 62°F | 44°F | 52.8°F | – | <1 | 4 | 10 h 30 min |
| February | 65°F | 47°F | 56.4°F | – | <1 | 1 | 11 h 10 min |
| March | 71°F | 53°F | 62.1°F | – | <1 | 1 | 12 h |
| April | 77°F | 60°F | 68.4°F | – | <1 | <1 | 12 h 50 min |
| May | 84°F | 68°F | 75.6°F | – | 3 | <1 | 13 h 40 min |
| June | 87°F | 73°F | 80.2°F | – | 10 | <1 | 14 h |
| July | 89°F | 75°F | 81.8°F | – | 17 | <1 | 13 h 50 min |
| August | 89°F | 75°F | 81.9°F | – | 18 | <1 | 13 h 20 min |
| September | 86°F | 71°F | 78.7°F | – | 7 | <1 | 12 h 20 min |
| October | 79°F | 62°F | 70.4°F | – | 1 | <1 | 11 h 30 min |
| November | 70°F | 51°F | 60.7°F | – | <1 | 1 | 10 h 40 min |
| December | 64°F | 45°F | 54.4°F | – | <1 | 2 | 10 h 10 min |
| Year (annual) | 77°F | 60°F | 68.6°F | – | 55 | 8 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | 17°C | 7°C | 11.6°C |
| February | 19°C | 8°C | 13.6°C |
| March | 22°C | 12°C | 16.7°C |
| April | 25°C | 15°C | 20.2°C |
| May | 29°C | 20°C | 24.2°C |
| June | 31°C | 23°C | 26.8°C |
| July | 32°C | 24°C | 27.7°C |
| August | 32°C | 24°C | 27.7°C |
| September | 30°C | 22°C | 25.9°C |
| October | 26°C | 17°C | 21.3°C |
| November | 21°C | 11°C | 15.9°C |
| December | 18°C | 7°C | 12.4°C |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00168108; 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 St Bernard?
Normal highs sit between 65°F and 85°F in February, March, April, May, October and November.
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 USC00168108.
When is the last frost at St Bernard?
In St Bernard, the last spring frost (32°F) comes after February 4 in half of years and after March 6 in one year in ten; the first autumn frost comes before December 15 in half of years and before November 23 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 41 year in 10 after March 6; 9 in 10 after December 31
- First autumn frost, half of years before
- December 151 year in 10 before November 23; 9 in 10 before January 10
NOAA puts the median frost-free season at 312 days, and the season without a hard freeze (28°F) at 344 days.
A hard freeze (28°F) comes after January 21 in half of springs and before December 30 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts St Bernard in zone 9b in ZIP code 70092, the nearest ZIP area.
Frost dates for every NOAA station in Louisiana · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00168108; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 St Bernard?
In a normal year in St Bernard, 55 days a year reach 90°F and 8 nights fall to 32°F or colder.
- Days at 90°F or more
- 55a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 8a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00168108.
How sunny is it at St Bernard?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds at St Bernard, 4.7 kWh per square metre a day. May is the sunniest month (85%) and December the cloudiest (72%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 73% | 3.0 |
| February | 72% | 3.6 |
| March | 78% | 4.8 |
| April | 81% | 5.7 |
| May | 85% | 6.4 |
| June | 81% | 6.2 |
| July | 77% | 5.7 |
| August | 77% | 5.3 |
| September | 81% | 5.0 |
| October | 84% | 4.4 |
| November | 81% | 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 St Bernard record?
A normal year at St Bernard brings 1,374 heating degree days, 74% fewer than the median U.S. place (5,373), and 2,710 cooling degree days, 3.0 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 6,979 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 388 | 8 |
| February | 259 | 17 |
| March | 142 | 52 |
| April | 37 | 138 |
| May | 2 | 330 |
| June | 0 | 454 |
| July | 0 | 521 |
| August | 0 | 522 |
| September | 0 | 411 |
| October | 30 | 197 |
| November | 176 | 48 |
| December | 340 | 11 |
| Year (annual) | 1,374 | 2,710 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00168108. 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 St Bernard's climate compare?
St Bernard is warmer than 48 of the 65 places with their own NOAA record in Louisiana. Across the 7,247 U.S. stations with normals, its annual mean of 68.6°F is warmer than 94%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near St Bernard 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.
- Violet, LA4,454 people · 4 mi NW
- Poydras, LA2,395 people · 4 mi W
- Delacroix, LA14 people · 8 mi S
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 St Bernard's climate
What is the coldest month at St Bernard?
January, with a normal high of 62°F and a normal low of 44°F. The warmest is August (89°F by day, 75°F at night).
What plant hardiness zone is St Bernard in?
The USDA's 2023 map puts St Bernard in zone 9b in ZIP code 70092, the nearest ZIP area.
How late can frost come at St Bernard?
In half of years the last 32°F night comes after February 4; in one year in ten it comes after March 6. Waiting until March 6 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Louisiana climateThe statewide normals and every place in the state
- Chalmette, LA11 miles from this station, 69.9°F a year
- Terrytown, LA12 miles from this station, 70.3°F a year
- Marrero, LA18 miles from this station, 68.4°F a year
- Lsu Citrus Research Station, LA20 miles from this station, 69.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made