Climate and monthly weather forecastRoswell, GA
Climate and monthly weather forecast
The climate of Roswell
Geographically placed in the southeast region of the United States, Roswell, Georgia, falls under the Köppen climate classification of Cfa. This classification indicates a humid subtropical climate, which in essence means no dry season throughout the year. The climate remains relatively stable, experiencing notable changes in temperature, humidity, and precipitation as the year progresses.Adorned with mild winters and hot summers, Roswell showcases a rather balanced annual temperature spread. The average monthly temperatures typically range from 34.2°F (1.2°C) in January to a high of 90.3°F (32.4°C) in July. The relative humidity hovers roughly within a stable window of 68% to 77%, adding a near constant moist sensation to the air.
Rainfall in this area does not witness drastically fluctuating patterns, instead being distributed fairly consistently across all months. Nonetheless, the wettest month of the year is typically August, receiving an average of 5.55" (141mm). Concurrently, Roswell is prone to fewer snowfall events with January experiencing an average of 1.18" (30mm), tapering down to essentially nil by the time March concludes.
The duration of daylight varies from a minimum of 9.9 hours during December to a maximum of 14.4 hours in June, whereas sunshine hours descend between 5 hours in December to a high of 10.5 hours during July. A low ultraviolet (UV) index is observed during the winter months, rising to a peak value of 6 in the summer.
The best time to visit Roswell
Ideally, the best time to visit Roswell can be considered to be during the late spring or early autumn period. From May to June and September to October, the city experiences a moderate climate with average high temperatures ranging from 72°F (22.2°C) to 83.8°F (28.8°C) and a tolerable level of humidity. The duration of daylight is also reasonably long, varying from 12.4 to 13.9 hours. Additionally, outdoor enthusiasts can enjoy relatively long sunshine hours, at least 8.5 hours per day. The exploration and enjoyment of outdoor activities are assured by a comfortable UV index level, never exceeding a value of 6.The worst time to visit Roswell
The peak of the summer season extending from July to August can be the least favorable time for a visit to Roswell. During these months, the city witnesses high temperatures, averaging 90.3°F (32.4°C) in July and 89.4°F (31.9°C) in August. Alongside, high humidity levels of over 70% can cause further discomfort. Despite these warm conditions, the city does see its highest rainfall, measuring about 4.92" (125mm) in July and 5.55" (141mm) in August. Consequently, this combination of factors can deter enjoyment of outdoor activities.Spring weather in Roswell
Roswell enters its spring season in March, bringing mild temperatures and more substantial rain. Average high temperatures start from 62.2°F (16.8°C) in March and top at 80.2°F (26.8°C) by the time May rolls around. Rainfall rates accelerate from 3.54" (90mm) to 4.41" (112mm) during this period.Summer weather in Roswell
Roswell epitomizes the typical southern US summer - hot and humid. From June to August, average high temperatures heighten from 87.4°F (30.8°C) to 90.3°F (32.4°C), then step down to 89.4°F (31.9°C). Evenings can still be warm, with the minimum temperature not going below 70.3°F (21.3°C). Moderate rainfall accompanies this season, adding to the humidity levels.Autumn weather in Roswell
Autumn in Roswell is characterized by moderate temperatures and decreased rainfall. The average high temperature drops from 83.8°F (28.8°C) in September to a cooler 60.8°F (16°C) in November. This period exhibits a decline in rainfall, bringing relief from the lingering summer humidity.Winter weather in Roswell
Winter in Roswell is generally mild with cooler temperatures and minimal snowfall. Temperatures navigate between an average high of 53.4°F (11.9°C) in December and an average low of 34.2°F (1.2°C) in January. Although snowfall is sporadic, the city does witness a slight accumulation averaging 1.18" (30mm) in January.Weather in January
Expect some winter chills in the city of Roswell, Georgia, in January. Although Georgia winters are typically mild, a brief snowfall is a possibility, with an average snowfall of 1.18" (30mm). The city experiences shorter daylight hours with maximum daylight at 10.2 hours, contributing to the slightly gloomy environment. Weather in January »Weather in February
Moving forward to February, the weather in Roswell experiences an abrupt change. The month enjoys an increased average high temperature from 49.3°F (9.6°C) in January to 54.5°F (12.5°C). Sunny spells start showing up more frequently, marking the end of the colder months. Weather in February »Weather in March
Walking into March, Roswell transitions from winter to spring. Noticeable changes appear with average high temperatures escalating to 62.2°F (16.8°C). The spring bloom begins to show as the weather warms and daylight extends to 12 hours. Weather in March »Weather in April
While April signifies the full onset of spring in Roswell, it comes with slightly unpredictable weather conditions. It experiences an impressive escalation in the average high temperature up to 72°F (22.2°C). Blue skies over the city become more predominant, ensuring sunlit days. Weather in April »Weather in May
May brings a touch of early summer in Roswell, instantly shifting the weather scenario. There is a rapid spike in the temperature with the average high soaring to 80.2°F (26.8°C). Outdoor activities reach their peak as locals and tourists venture out to enjoy the sunny climate. Weather in May »Weather in June
Entering into June, Roswell shakes off the spring coolness and embraces the summer warmth. The city experiences its hottest average high temperatures at 87.4°F (30.8°C). Water parks and pools around the city bustle with joyous laughter and thrills. Weather in June »Weather in July
July sets the benchmark for summer in Roswell and experiences peak temperatures. The average high temperature reaches its utmost level at 90.3°F (32.4°C). The city witnesses blue skies and strong sunshine, but it also encounters the year’s highest rainfall, reaching 4.92" (125mm). Weather in July »Weather in August
August in Roswell offers a slightly cooler atmosphere compared to July. The month observes a slight drop in the average high temperature to 89.4°F (31.9°C). Pools and water parks remain crowded, with locals and tourists seeking refuge from the intense sun. Weather in August »Weather in September
Roswell in September transitions into autumn, offering a more pleasant weather condition. The average high temperature further descends to 83.8°F (28.8°C), marking the end of intense summer heat. Autumnal gold and red hues begin to paint the city trees. Weather in September »Weather in October
October in Roswell welcomes the fall in full swing. The city experiences a more significant drop in the average high temperature down to 72.3°F (22.4°C). Lush landscapes transform into sceneries of warm fall colors, offering breath-taking views. Weather in October »Weather in November
November further accentuates the chill in Roswell, indicating an approaching winter. There is a notable decline in average high temperature to 60.8°F (16°C). The town's foliage boasts brilliant shades of red, gold, and brown, presenting a picturesque view. Weather in November »Weather in December
December concludes the year quietly in Roswell, rolling back into winter. Temperatures plummet further with an average high temperature of 53.4°F (11.9°C). The festive spirit fills the town, with brightly lit streets and decorated homes. Weather in December »Updated: Jul 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
In Roswell, January is the coldest month, with temperatures averaging a high of 49.3°F (9.6°C) and a low of 34.2°F (1.2°C).
Throughout the year, there are 183.1 rainfall days, and 45.12" (1146mm) of precipitation is accumulated.
Months with snowfall are January through March, November and December.
January is the month with the most snowfall. Snow falls for 1.5 days and accumulates 1.18" (30mm) of snow.
In Roswell, during the entire year, snow falls for 4.2 days and aggregates up to 2.95" (75mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
In Roswell, snow does not fall in April through October.
The months with the highest UV index in Roswell are May through August, with an average maximum UV index of 6.
June has the longest days of the year, with an average of 14h and 24min of daylight.
July stands out as Roswell's warmest month, with temperatures ranging between an average high of 90.3°F (32.4°C) and a low of 71.2°F (21.8°C).
The months with the lowest humidity are July and August, with an average relative humidity of 68%.
July has the most sunshine of the year, with an average of 10.5h of sunshine.
August is the month with the most rainfall. Rain falls for 20.3 days and accumulates 5.55" (141mm) of precipitation.
The month with the least rainfall is October, when the rain falls for 10.3 days and typically collects 2.36" (60mm) of precipitation.
With an average relative humidity of 77%, December is the most humid month.
With an average of 9h and 54min of daylight, December has the shortest days of the year.
The month with the least sunshine is December, with an average of 5h of sunshine.
The month with the lowest UV index is December, with an average maximum UV index of 2.
Average temperature
Roswell, GA
The warmest month (with the highest average high temperature) is July (90.3°F).
The month with the lowest average high temperature is January (49.3°F).
The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (34.2°F).
Average pressure
Roswell, GA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.1"Hg - Average pressure in April:
30.02"Hg - Average pressure in May:
30.03"Hg - Average pressure in June:
29.99"Hg
- Average pressure in July:
30.01"Hg - Average pressure in August:
30.01"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.06"Hg - Average pressure in November:
30.15"Hg - Average pressure in December:
30.15"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).
Average wind speed
Roswell, GA
- Average wind speed in January:
8mph - Average wind speed in February:
7.9mph - Average wind speed in March:
7.5mph - Average wind speed in April:
7.3mph - Average wind speed in May:
5.8mph - Average wind speed in June:
5.1mph
- Average wind speed in July:
4.7mph - Average wind speed in August:
4.6mph - Average wind speed in September:
5mph - Average wind speed in October:
6.1mph - Average wind speed in November:
6.6mph - Average wind speed in December:
7.4mph
The windiest month (with the highest average wind speed) is January (8mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).
Average humidity
Roswell, GA
The month with the highest relative humidity is December (77%).
The months with the lowest relative humidity are July and August (68%).
Average rainfall
Roswell, GA
- Average rainfall in January:
3.15" - Average rainfall in February:
3.78" - Average rainfall in March:
3.54" - Average rainfall in April:
3.74" - Average rainfall in May:
4.41" - Average rainfall in June:
3.82"
- Average rainfall in July:
4.92" - Average rainfall in August:
5.55" - Average rainfall in September:
2.8" - Average rainfall in October:
2.36" - Average rainfall in November:
3.23" - Average rainfall in December:
3.82"
The wettest month (with the highest rainfall) is August (5.55").
The driest month (with the least rainfall) is October (2.36").
Average rainfall days
Roswell, GA
- Average rainfall days in January:
12.3 days - Average rainfall days in February:
14.5 days - Average rainfall days in March:
15.4 days - Average rainfall days in April:
14.8 days - Average rainfall days in May:
18.4 days - Average rainfall days in June:
19.1 days
- Average rainfall days in July:
20.8 days - Average rainfall days in August:
20.3 days - Average rainfall days in September:
13.1 days - Average rainfall days in October:
10.3 days - Average rainfall days in November:
10.3 days - Average rainfall days in December:
13.8 days
The month with the highest number of rainy days is July (20.8 days).
The months with the least rainy days are October and November (10.3 days).
Average snowfall
Roswell, GA
The month with the highest snowfall is January (1.18").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Roswell, GA
- Average snowfall days in January:
1.5 days - Average snowfall days in February:
1.3 days - Average snowfall days in March:
0.4 days - Average snowfall days in April:
0.1 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.3 days - Average snowfall days in December:
0.6 days
The month with the highest number of snowfall days is January (1.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Roswell, GA
- Average daylight in January:
10h and 12min - Average daylight in February:
11h and 0min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 6min - Average daylight in May:
13h and 54min - Average daylight in June:
14h and 24min
- Average daylight in July:
14h and 12min - Average daylight in August:
13h and 24min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 18min - Average daylight in November:
10h and 24min - Average daylight in December:
9h and 54min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in January:
5h and 30min - Average sunshine in February:
6h and 18min - Average sunshine in March:
6h and 48min - Average sunshine in April:
8h and 24min - Average sunshine in May:
9h and 42min - Average sunshine in June:
10h and 24min
- Average sunshine in July:
10h and 30min - Average sunshine in August:
9h and 18min - Average sunshine in September:
8h and 30min - Average sunshine in October:
7h and 0min - Average sunshine in November:
5h and 48min - Average sunshine in December:
5h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).
Average sunshine days
Roswell, GA
- Average sunshine days in January:
16.7 days - Average sunshine days in February:
11.7 days - Average sunshine days in March:
13.2 days - Average sunshine days in April:
13.6 days - Average sunshine days in May:
11.3 days - Average sunshine days in June:
8.9 days
- Average sunshine days in July:
8 days - Average sunshine days in August:
8.9 days - Average sunshine days in September:
15 days - Average sunshine days in October:
19.1 days - Average sunshine days in November:
18.5 days - Average sunshine days in December:
15.5 days
The month with the most sunshine days is October (19.1 days).
The month with the least sunshine days is July (8 days).
Average UV index
Roswell, GA
The months with the highest UV index are May, June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 2).
Average cloud cover
Roswell, GA
The months with the most cloud cover are February and December (Cloud cover 47).
The month with the least cloud cover is June (Cloud cover 31).
Average visibility
Roswell, GA
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).
