Climate and monthly weather forecast
Gretna, LA

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The climate of Gretna

Gretna, Louisiana, is a place that carries the classification of Cfa under the Köppen climate system. This translates to a humid subtropical climate with no distinct dry season. Its geographical location being in the Southeastern United States, its climate illustrates a steady pattern of humidity and rainfall throughout the year, with highest average temperatures from June to August.

Examining the climatological parameters, there is a noticeable variation in the weather conditions throughout the year. Beginning with the temperatures, it can be observed that the warmest months range from June to August, where highs reach the peak at 89.4°F (31.9°C). On the converse, the cooler stretches are from December to February where the lows dip to 48.6°F (9.2°C).

Relative humidity ranges around 72% to 77%, maintaining a consistent level of moisture in the air. This reinforces the predominance of the humid subtropical climate of Gretna. The extent of rainfall is higher during the summer months; July and August record from 1.46" (37mm) to 1.57" (40mm), the most significant volume in the year.

The occurrence of unique weather conditions or patterns cannot go unnoticed. The rainfall appears even in the driest months, estimating 0.43" (11mm) in March and April. The absence of snowfall during the entire year reaffirms the subtropical climate.

The best time to visit Gretna

When contemplating the best time to visit Gretna, a few considerations factor into the decision. Ideal conditions for outdoor activities would require warm but bearable temperatures and relatively balanced rainfall. Following these criteria, the spring month of April seems to offer inviting weather conditions. The temperature peaks hover around 77°F (25°C) and there is lesser rainfall, measuring 0.43" (11mm) on average. Gretna in April also records 9.9 hours of sunshine per day on average, indicating clear skies for most of the daytime.

The worst time to visit Gretna

Contrarily, the least favorable time to plan a visit to Gretna would likely fall in the rainy and hot season. The month of August claims the highest humidity of the year at 79.5°F (26.4°C) and experiences significant rain activity of 1.46" (37mm). These conditions can impact outdoor and recreational activities negatively, making August potentially the least accommodating period to travel to Gretna.

Spring weather in Gretna

Spring in Gretna witnesses the transition from cooler to warmer temperatures. The high temperatures throughout the season rise steadily, starting at 60.4°F (15.8°C) in February, reaching 70.7°F (21.5°C) in March, and peaking at 77°F (25°C) in April. It's a great reprieve from the chills of winter and the heat of summer. The rainfall hovers around 0.43" (11mm) on average, with about 6 to 8 rainfall days per month. The daylight hours gradually lengthen from 10.5 hours in February up to 12.9 hours in April, allowing for longer enjoyment of the delightful spring days.

Summer weather in Gretna

Hot and humid best describes the summer months in Gretna. June through August see average high temperatures ranging between 82.9°F (28.3°C) to 89.4°F (31.9°C). It's important to note that rainfall also sees a significant increase during summer, recording from 0.87" (22mm) in June and peaking at 1.57" (40mm) in July. Despite the high heat and humidity, holidaymakers can enjoy an average of 10.6 to 14.1 hours of daylight and about 10.6 hours of sunshine daily, offering ample time for sunbathing and water sports.

Autumn weather in Gretna

Autumn sees a cooling down with average high temperatures dropping from 86.5°F (30.3°C) in September to 68.9°F (20.5°C) by the time November comes around. Correspondingly, the average low temperatures decrease from 76.3°F (24.6°C) to 57.4°F (14.1°C). Gretna experiences less frequent rainfall during these months, averaging 0.63" (16mm) by November. Sunshine hours reduce to approximately 6.1 hours daily, with daylight averaging 10.7 hours.

Winter weather in Gretna

Winters in Gretna are generally mild and not excessively chilly. High temperatures range from 63.5°F (17.5°C) to 60.4°F (15.8°C) during December and February respectively. Even though the temperatures are mild, it's advisable to have warm clothing due to the relatively low temperatures that go down to 52.5°F (11.4°C) during the season. Rainfall is moderate, ranging from 0.79" (20mm) to 0.47" (12mm), and there is an absence of snowfall due to the subtropical climate. Despite the lower temperatures, the winter months provide an average sunlight exposure of around 5.1 hours and up to 10.3 hours of daylight.

Weather in January

A typical January in Gretna, Louisiana, carries characteristics of a mild winter. Days are filled with cool, comfortable temperatures and nights come with a chilly breeze. Visibility stands steady at 6 miles, offering smooth commutation and travel for residents and tourists alike. Weather in January »

Weather in February

Weather in February in Gretna brings minor changes as compared to January. The city experiences a welcome increase in temperature, making outdoor activities pleasant. February's earthy scent is further beautified with falling rain, as the city records the highest rainfall days of 7.1 in the year. Weather in February »

Weather in March

Progressing into March, Gretna sees a transition from cooler weather conditions to warmer days. This month sees an increase in sun exposure and longer daylight hours, affecting daily weather conditions. Changes in temperature and humidity have a direct effect on the city's rainfall, marking it lowest at 0.43" (11mm) for the year. Weather in March »

Weather in April

Consistent weather improvements continue in Gretna in April. Residents enjoy a tinge of summer warmth as the sun shines brightly across the city. April shares the lowest amount of rainfall, at 0.43" (11mm), with March, leading to drier conditions. Weather in April »

Weather in May

Come May, and Gretna gradually transitions into a summer setting. The city witnesses a substantial increase in daily temperatures, providing a warm break from the chilled winter months. Despite the heat, residents still experience rains, with a significant rainfall of 0.75" (19mm). Weather in May »

Weather in June

Gretna embraces the peak of summer temperatures during the month of June. This change in weather, coupled with the longest daylight hours, makes June a month of big, bold and sun-drenched days. However, June differs from the preceding month and receives the most rainfall at 0.87" (22mm). Weather in June »

Weather in July

Steady summer temperatures continue in Gretna into July. Alongside, the city receives the highest amount of rainfall, at 1.57" (40mm), making it the wettest month of the year. Despite increased rain showers,daily routines remain unhindered, thanks to a generous visibility of 6 miles throughout the year. Weather in July »

Weather in August

August in Gretna closely mirrors July, minus a small decrease in every element including temperature, rainfall, and daylight hours. The city, however, records the highest number of rainfall days at 17.2, making it a month of numerous rain showers. Weather in August »

Weather in September

September beckons the start of more clement weather in Gretna with a decrease in temperatures. Decreased rainfall of 0.47" (12mm) signals drier days. Average sunlight hours start to decline, thus signaling the advent of autumn. Weather in September »

Weather in October

October announces the arrival of a mellowed-down and pleasant fall in Gretna. The city experiences a notable drop in temperatures, shifting away from the summer heat. Gretna's rainfall increases by half from the last month, reaching 0.94" (24mm). Weather in October »

Weather in November

November weather in Gretna brings a cool departure from the warm and wet previous months. As temperatures continue to drop, the weather takes on a more winter-like feel. The rainfall stands at 0.63" (16mm), ushering in drier days ahead. Weather in November »

Weather in December

December rounds out the weather report in Gretna, ending the year with chilly temperatures and a festive feel. The weather is the coolest from the entire year, with the lowermost low temperature recorded at 48.6°F (9.2°C). Rainfall levels rise slightly, reaching 0.79" (20mm), thus resulting in wet and cold weather. Weather in December »
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Frequently asked questions

What month is the coldest in Gretna?

Gretna's January weather, marked by an average high temperature of 60.4°F (15.8°C) and an average low temperature of 48.6°F (9.2°C), is the coldest in the year.

How much does it rain in Gretna?

In Gretna, during the entire year, the rain falls for 112.1 days and collects up to 9.37" (238mm) of precipitation.

When does it snow in Gretna?

January is the only month when snow falls.

What is the snowiest month in Gretna?

The month with the most snowfall days is January, when snow falls for 0.1 days.

How many days does it snow in Gretna?

In Gretna, during the entire year, snow falls for 0.1 days.

What is the most humid month in Gretna?

February and December, with an average relative humidity of 77%, are most humid months in Gretna, Louisiana.

When it does not snow in Gretna?

In Gretna, snow does not fall in February through December.

What is the driest month in Gretna?

March and April are months with the least rain in Gretna when the rain falls for 8.3 days and typically aggregates up to 0.43" (11mm) of rain.

When is Daylight Saving Time (DST) in Gretna?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.

What is the month with the highest UV index in Gretna?

The months with the highest UV index are May through September, with an average maximum UV index of 7.

When are the longest days in Gretna?

June has the longest days of the year, with an average of 14h and 0min of daylight.

What month has the most sunshine in Gretna?

June has the most sunshine of the year in Gretna, with an average of 11h of sunshine.

What is the hottest time of year in Gretna?

Gretna's warmest months, July and August, record an average high-temperature of 89.4°F (31.9°C).

What is the rainiest month in Gretna?

July is the month with the most rainfall. Rain falls for 15.5 days and accumulates 1.57" (40mm) of precipitation.

What is the least humid month in Gretna?

The least humid month in Gretna is October, with an average relative humidity of 71%.

What is the month with the shortest days in Gretna?

December has the shortest days of the year in Gretna, Louisiana, with an average of 10h and 18min of daylight.

What is the month with the least sunshine in Gretna?

The month with the least sunshine in Gretna, Louisiana, is December, with an average of 5.1h of sunshine.

When is the lowest UV index in Gretna?

The month with the lowest UV index in Gretna is December, with an average maximum UV index of 3.

Average temperature
Gretna, LA

Average temperature - Gretna, LA

The warmest months (with the highest average high temperature) are July and August (89.4°F).
The month with the lowest average high temperature is January (60.4°F).

The month with the highest average low temperature is August (79.5°F).
The coldest month (with the lowest average low temperature) is January (48.6°F).

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Average pressure
Gretna, LA

Average pressure - Gretna, LA

The month with the highest atmospheric pressure is January (30.16"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.97"Hg).

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Average wind speed
Gretna, LA

Average wind speed - Gretna, LA

The windiest months (with the highest average wind speed) are February and April (9.8mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).

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Average humidity
Gretna, LA

Average humidity - Gretna, LA

The months with the highest relative humidity are February and December (77%).
The month with the lowest relative humidity is October (71%).

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Average rainfall
Gretna, LA

Average rainfall - Gretna, LA

The wettest month (with the highest rainfall) is July (1.57").
The driest months (with the least rainfall) are March and April (0.43").

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Average rainfall days
Gretna, LA

Average rainfall days - Gretna, LA

The month with the highest number of rainy days is August (17.2 days).
The month with the least rainy days is November (4.7 days).

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Average snowfall days
Gretna, LA

Average snowfall days - Gretna, LA

The month with the highest number of snowfall days is January (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight / Average sunshine
Gretna, LA

Average daylight / Average sunshine - Gretna, LA

The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).

The month with the most sunshine is June (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).

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Average sunshine days
Gretna, LA

Average sunshine days - Gretna, LA

The month with the most sunshine days is November (23.5 days).
The month with the least sunshine days is August (8.9 days).

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Average UV index
Gretna, LA

Average UV index - Gretna, LA

The months with the highest UV index are May, June, July, August and September (UV index 7).
The month with the lowest UV index is December (UV index 3).

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Average visibility
Gretna, LA

Average visibility - Gretna, LA

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Gretna, Louisiana, USA

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