Gretna (LA) monthly weather averages

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Gretna

Gretna average temperature chart (Celsius) Gretna average temperature chart (Fahrenheit)
Average monthly temperatures in Gretna (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 15.9 17.7 21.7 25.5 28.9 31.7 32.5 32.3 30.3 26.2 21.5 17.8
°F 60.6 63.8 71 77.9 84 89.1 90.5 90.2 86.6 79.2 70.7 64.1

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Gretna monthly rainfall chart (mm) Gretna monthly rainfall chart (inches)
Average monthly rainfall in Gretna (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 128 134 125 127 122 142 174 163 147 73 106 128
inches 5 5.3 4.9 5 4.8 5.6 6.9 6.4 5.8 2.9 4.2 5.1
Rainy days 10 9 9 7 8 11 14 14 10 6 8 10

Average annual rainfall in Gretna: 1510.234mm (594.6 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Gretna

Gretna average daily sunshine chart
Average daily sunshine Gretna
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.6 6.5 7.7 9.2 9.6 9.6 8.8 8.6 8.1 8.4 6.5 5.8

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Gretna average minimum / maximum temperatures (Celsius) Gretna average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Gretna (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 6.3 7.9 11.7 15.7 19.3 22.5 23.5 23.5 21.7 15.9 11.7 8.2
Max °C 16.2 17.9 21.9 25.8 29.1 32 32.7 32.6 30.6 26.5 21.8 18.1
Min °F 43.3 46.2 53.1 60.2 66.7 72.4 74.3 74.2 71 60.6 53 46.7
Max °F 52.2 55.2 62.2 69.3 75.6 81 82.6 82.4 79 70.2 62.1 55.6

Sea temperature

The graph below shows the average sea temperature.

Gretna average sea temperature chart (Celsius) Gretna average sea temperature chart (Fahrenheit)
Average sea temperature around Gretna in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 18.1 17.8 19 21.6 25.1 28.3 29.6 29.8 28.6 25.6 22.4 20
°F 64.6 64 66.2 70.9 77.2 83 85.4 85.7 83.5 78.1 72.3 68

Wind speed

The graph below shows the average wind speed.

Gretna average winspeed by month (km/h) Gretna average winspeed by month (mph)
Average wind speed in Gretna (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 16 17 17 16 14 12 10 10 12 12 14 15
mph 10 10 10 10 9 7 6 6 7 8 9 9

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Gretna relative humidity averages
Average relative humidity in Gretna
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
76% 73% 73% 73% 74% 76% 79% 79% 78% 75% 77% 77%