Climate and monthly weather forecastDecatur, AL
Climate and monthly weather forecast
The climate of Decatur
Located in Northern Alabama, USA, the city of Decatur experiences a humid subtropical climate, characterized as 'Cfa' according to the Köppen climate classification, which signifies no dry season. The overall weather in Decatur exhibits consistent patterns throughout the year.Temperature ranges from a low of 33.3°F (0.7°C) in the chilliest month of January up to a high of 88.5°F (31.4°C) in July, the hottest month. Perceptible fluctuations occur with weather parameters such as humidity, rainfall, snowfall and sunshine duration. The relative humidity remains stable, oscillating moderately between 72% and 79%.
Rainfall varies the least, with the driest month of November recording 2.48" (63mm) of rain and the wettest month, April, witnessing 4.37" (111mm). Snowfall primarily occurs only in January and February with 0.55" (14mm) and 0.24" (6mm) respectively.
Unique weather conditions include the longest duration of daylight hours in June, registering at 14.4 hours, contrasted with the shortest daylight of 9.9 hours in December. Wind speeds average 8.3mph (13.4km/h) to 4.8mph (7.7km/h) within a year without any significant gusts.
The best time to visit Decatur
The optimal time for visiting Decatur would certainly be during the moderate late spring to early summer months of May and June. During these months, the average high temperature is between 78.8°F (26°C) to 86.7°F (30.4°C), and the rainfall levels are rather on the lower side, from 3.5" (89mm) to 3.31" (84mm) respectively. Ample daylight hours of 14 to 14.4 and a comfortable relative humidity of 76% to 75% make this period the most appealing for outdoor activities and sightseeing.The worst time to visit Decatur
The least preferable time to visit Decatur is likely during the cold winters, primarily in January. The average low temperature dips down to 33.3°F (0.7°C), significantly lowering outdoor briskness. Furthermore, despite only receiving 0.55" (14mm) of snowfall, the shorter daylight duration of 10.1 hours can hamper sightseeing and travel plans.Spring weather in Decatur
Spring in Decatur, from March to May, progressively warms up with increasing daylight hours. Average high temperatures steadily rise from 61.3°F (16.3°C) in March to 78.8°F (26°C) in May. Average lows between 44.2°F (6.8°C) in March to 59.9°F (15.5°C) in May indicate temperate evenings. Rainfall does see a notable increase, with April being the wettest month with 4.37" (111mm) of rain recorded.Summer weather in Decatur
The summer months from June to August typically see high temperatures, averaging between 86.7°F (30.4°C) and 88.2°F (31.2°C). July and August share similar maximum averages around 88°F (31.1°C). The minimum temperature, though warmly comfortable, spans from 67.3°F (19.6°C) in June to 69.4°F (20.8°C) in July. Even in the hottest months, rainfall still persists with the highest measure of 3.82" (97mm) observed in August.Autumn weather in Decatur
Autumn, observed from September to November, brings about a cooling phase in Decatur. The average high temperatures drop from 83.1°F (28.4°C) in September to a cool 59.5°F (15.3°C) in November. The lower temperatures also dip from 63.7°F (17.6°C) to 42.3°F (5.7°C) within the same period. Rainfall reduces with the onset of autumn, with the least measure recorded as 2.48" (63mm) in November.Winter weather in Decatur
Winter in Decatur, spanning from December to February, sees a pronounced dip in temperatures. The temperatures range from a low of 33.3°F (0.7°C) in January to a high of 53.1°F (11.7°C) in February. Snowfall is minimal, with the highest measure in January and February at 0.55" (14mm) and 0.24" (6mm) respectively. The daylight hours are also significantly reduced down to 9.9 hours in December. The relative humidity touches its peak at 79% in December, indicating cooler and moist conditions. Though the wind speed also rises to 8.1mph (13km/h) in December, Decatur's winter can be considered relatively mild compared to many other regions in the USA.Weather in January
January in Decatur, Alabama, is characterized by relatively low temperatures, with the mercury ranging from 33.3°F (0.7°C) to 47.5°F (8.6°C). It becomes chillier compared to December. The colder days encourage more indoor activities and outdoor winter preparations. Weather in January »Weather in February
February preserves the impressions of January, but warms up slightly, providing a hint of the advancing spring. The lowest temperature note is 37.2°F (2.9°C) and the highest reaches up to 53.1°F (11.7°C), showcasing the minor but notable rise from the previous month. Weather in February »Weather in March
Switching to spring in March, it ushers a noticeable transition in weather conditions in Decatur. The upward swing on the thermometer from 44.2°F (6.8°C) to 61.3°F (16.3°C) indicates the faster pace towards warmth. The snowfall disappears altogether, taking with it the wistful memories of winter. Weather in March »Weather in April
April brings milder weather to Decatur, with the temperature rising from 51.4°F (10.8°C) to 70.5°F (21.4°C), signaling full immersion in Spring. The city sees a surge in the amount of sunshine and daylight hours allows for a longer period of outdoor activities. Weather in April »Weather in May
May is marked by a significant warmth in Decatur, with temperatures ranging from 59.9°F (15.5°C) to 78.8°F (26°C), implying a pleasant presage of summer. With the reduction in cloud cover, the abundant sunshine further adds to the warmth. Weather in May »Weather in June
June welcomes balmy summer in Decatur, escalating the heat from the low of 67.3°F (19.6°C) to 86.7°F (30.4°C) high, a noticeable jump from May. It is the month that enjoys the longest day in a year, bringing maximum hours of sunshine. Weather in June »Weather in July
July signifies the peak of summer in Decatur, with a temperature rise from 69.4°F (20.8°C) to 88.5°F (31.4°C), the highest recorded in the year. Days in July also pack in slightly less sunshine compared to June. Although rainfall is consistent, it is insufficient to dampen the summer enthusiasm. Weather in July »Weather in August
August maintains the summer spirit in Decatur, with temperatures sustaining from 68.9°F (20.5°C) to 88.2°F (31.2°C), showcasing a steady hold from July. The daylight hours start to shrink, hinting the approaching autumn but the city continues to bask under ample sunshine. Weather in August »Weather in September
September marks the transition from summer to autumn in Decatur, showcasing a wide temperature swing from 63.7°F (17.6°C) to 83.1°F (28.4°C). The city witnesses a level of cloud cover reduction, allowing sunshine to pour generously over the landscapes. Weather in September »Weather in October
October brings profound autumn weather to Decatur, with temperatures taking a dip, registering between 52.7°F (11.5°C) and 72.1°F (22.3°C). The decrease in temperature from the previous month sets the tone for incoming chill. Weather in October »Weather in November
November ushers in late autumn in Decatur, cooling down further with temperatures spanning from 42.3°F (5.7°C) to 59.5°F (15.3°C). This month offers the clearest visibility, laying out perfect conditions for outdoor exploration. Weather in November »Weather in December
December in Decatur kicks off the winter season, displaying temperatures from 38.3°F (3.5°C) to 51.6°F (10.9°C), solidifying the departure from the milder conditions in November. The city sees a revival of snowfall, although light, it still ushering the joyous period of Christmas celebrations. Weather in December »Updated: Aug 30, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
In Decatur, January records the average lowest temperatures, peaking at 47.5°F (8.6°C) and reaching a low of 33.3°F (0.7°C).
In Decatur, during the entire year, the rain falls for 177.6 days and collects up to 43.11" (1095mm) of precipitation.
Months with snowfall are January through March, November and December.
The months with the most snowfall are January and February, with an average 0.55" (14mm) of accumulated snow.
In Decatur, during the entire year, snow falls for 7.4 days and aggregates up to 1.77" (45mm) of snow.
The months with the lowest UV index are January and December, with an average maximum UV index of 2.
February has the least sunshine of the year in Decatur, with an average of 4.6h of sunshine.
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.
In Decatur, snow does not fall in April through October.
May through August, with an average maximum UV index of 6, are months with the highest UV index.
With an average of 14h and 24min of daylight, June has the longest days of the year.
With an average of 10.5h of sunshine, June has the most sunshine of the year.
Decatur's warmest weather arrives in July, when temperatures average a high of 88.5°F (31.4°C) and a low of 69.4°F (20.8°C).
The months with the least rainfall are September and November Rain falls for 13.8 days and accumulates 2.48" (63mm) of rain.
October is the least humid month, with an average relative humidity of 72%.
The most humid month is December, with an average relative humidity of 79%.
December is the month with the most rainfall. Rain falls for 13.3 days and accumulates 4.45" (113mm) of precipitation.
With an average of 9h and 54min of daylight, December has the shortest days of the year.
Average temperature
Decatur, AL
The warmest month (with the highest average high temperature) is July (88.5°F).
The month with the lowest average high temperature is January (47.5°F).
The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (33.3°F).
Average pressure
Decatur, AL
- Average pressure in January:
30.17"Hg - Average pressure in February:
30.13"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
30"Hg - Average pressure in May:
30.01"Hg - Average pressure in June:
29.98"Hg
- Average pressure in July:
30"Hg - Average pressure in August:
29.99"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.06"Hg - Average pressure in November:
30.16"Hg - Average pressure in December:
30.15"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed
Decatur, AL
- Average wind speed in January:
8.3mph - Average wind speed in February:
8.6mph - Average wind speed in March:
8.3mph - Average wind speed in April:
8.1mph - Average wind speed in May:
6.4mph - Average wind speed in June:
5.4mph
- Average wind speed in July:
4.8mph - Average wind speed in August:
4.9mph - Average wind speed in September:
5.3mph - Average wind speed in October:
6.8mph - Average wind speed in November:
7.5mph - Average wind speed in December:
8.1mph
The windiest month (with the highest average wind speed) is February (8.6mph).
The calmest month (with the lowest average wind speed) is July (4.8mph).
Average humidity
Decatur, AL
The month with the highest relative humidity is December (79%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Decatur, AL
- Average rainfall in January:
3.94" - Average rainfall in February:
4.17" - Average rainfall in March:
3.78" - Average rainfall in April:
4.37" - Average rainfall in May:
3.5" - Average rainfall in June:
3.31"
- Average rainfall in July:
3.74" - Average rainfall in August:
3.82" - Average rainfall in September:
2.48" - Average rainfall in October:
3.07" - Average rainfall in November:
2.48" - Average rainfall in December:
4.45"
The wettest month (with the highest rainfall) is December (4.45").
The driest months (with the least rainfall) are September and November (2.48").
Average rainfall days
Decatur, AL
- Average rainfall days in January:
12.3 days - Average rainfall days in February:
13.3 days - Average rainfall days in March:
15.4 days - Average rainfall days in April:
14.5 days - Average rainfall days in May:
16.9 days - Average rainfall days in June:
17.7 days
- Average rainfall days in July:
20 days - Average rainfall days in August:
19 days - Average rainfall days in September:
13.8 days - Average rainfall days in October:
11 days - Average rainfall days in November:
10.4 days - Average rainfall days in December:
13.3 days
The month with the highest number of rainy days is July (20 days).
The month with the least rainy days is November (10.4 days).
Average snowfall
Decatur, AL
The months with the highest snowfall are January and February (0.55").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Decatur, AL
- Average snowfall days in January:
2 days - Average snowfall days in February:
2.5 days - Average snowfall days in March:
0.8 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:
0.5 days - Average snowfall days in December:
1.5 days
The month with the highest number of snowfall days is February (2.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Decatur, AL
- Average daylight in January:
10h and 6min - 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:
14h and 0min - 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:
4h and 54min - Average sunshine in February:
4h and 36min - Average sunshine in March:
6h and 12min - Average sunshine in April:
9h and 6min - Average sunshine in May:
9h and 42min - Average sunshine in June:
10h and 30min
- Average sunshine in July:
10h and 18min - Average sunshine in August:
10h and 6min - Average sunshine in September:
8h and 48min - Average sunshine in October:
7h and 6min - Average sunshine in November:
5h and 42min - Average sunshine in December:
4h and 48min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days
Decatur, AL
- Average sunshine days in January:
16.1 days - Average sunshine days in February:
11.9 days - Average sunshine days in March:
12.2 days - Average sunshine days in April:
13.6 days - Average sunshine days in May:
12.6 days - Average sunshine days in June:
10.7 days
- Average sunshine days in July:
8.8 days - Average sunshine days in August:
9.3 days - Average sunshine days in September:
13.9 days - Average sunshine days in October:
19.2 days - Average sunshine days in November:
18.1 days - Average sunshine days in December:
15.5 days
The month with the most sunshine days is October (19.2 days).
The month with the least sunshine days is July (8.8 days).
Average UV index
Decatur, AL
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 and December (UV index 2).
Average cloud cover
Decatur, AL
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility
Decatur, AL
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).
