Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
Gretna's temperature records reveal January as the coldest month, marked by average highs of 43.3°F (6.3°C) and lows of 28.4°F (-2°C).Humidity
The average relative humidity in January is 72%.Rainfall
In Gretna, in January, during 10.1 rainfall days, 2.48" (63mm) of precipitation is typically accumulated. Throughout the year, there are 158.8 rainfall days, and 30.91" (785mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In January, in Gretna, it is snowing for 3.5 days. Throughout January, 2.48" (63mm) of snow is accumulated. In Gretna, during the entire year, snow falls for 11.8 days and aggregates up to 10.2" (259mm) of snow.Daylight
In Gretna, the average length of the day in January is 9h and 58min.On the first day of January in Gretna, sunrise is at 7:30 am and sunset at 5:11 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 5:40 pm EST.
Sunshine
The month with the least sunshine in Gretna, Virginia, is January, with an average of 5.3h of sunshine.UV index
The months with the lowest UV index in Gretna are January, February and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the average person.Note: A daily high UV index of 2 in January leads to these guidelines:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest in Gretna?
How cold does it get in Gretna in January?
What is the average humidity in January in Gretna?
How much does it rain in Gretna in January?
How much does it snow in Gretna in January?
How many hours of daylight does Gretna have in January?
What time are sunrise and sunset in January in Gretna?
What is the month with the least sunshine in Gretna?
How long on average sun shines in January in Gretna?
When is the lowest UV index in Gretna?
How high is the UV index in January in Gretna?
Average temperature in January
Gretna, VA
- Average high temperature in January: 43.3°F
The warmest month (with the highest average high temperature) is July (88.7°F).
The month with the lowest average high temperature is January (43.3°F).
- Average low temperature in January: 28.4°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (28.4°F).
Average pressure in January
Gretna, VA
- Average pressure in January: 30.13"Hg
The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in January
Gretna, VA
- Average wind speed in January: 7mph
The windiest months (with the highest average wind speed) are February and April (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in January
Gretna, VA
- Average humidity in January: 72%
The months with the highest relative humidity are May and December (76%).
The month with the lowest relative humidity is July (69%).
Average rainfall in January
Gretna, VA
- Average rainfall in January: 2.48"
The wettest month (with the highest rainfall) is May (3.82").
The driest month (with the least rainfall) is September (1.97").
Average rainfall days in January
Gretna, VA
- Average rainfall days in January: 10.1 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is November (8.8 days).
Average snowfall in January
Gretna, VA
- Average snowfall in January: 2.48"
The month with the highest snowfall is February (3.19").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Gretna, VA
- Average snowfall days in January: 3.5 days
The month with the highest number of snowfall days is February (4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Gretna, VA
- Average daylight in January: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in January: 5h and 2min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 5h and 18min).
Average sunshine days in January
Gretna, VA
- Average sunshine days in January: 18.4 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is May (10.9 days).
Average UV index in January
Gretna, VA
- Average UV index in January: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in January
Gretna, VA
- Average cloud cover in January: 41
The months with the most cloud cover are February and March (Cloud cover 44).
The months with the least cloud cover are June and July (Cloud cover 31).
Average visibility in January
Gretna, VA
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Gretna, Virginia, USA
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