Climate and monthly weather forecastMountain Brook, AL
Climate and monthly weather forecast
The climate of Mountain Brook
Mountain Brook, Alabama occupies a geographical position that presents it with a Humid subtropical climate, no dry season, as per the Köppen climate classification. This indicates an environment where temperatures remain consistently warm and rainfall relatively high, throughout the year.Breaking down the climatological data for Mountain Brook reveals a definitive pattern in the weather parameters throughout the year. Temperatures demonstrate a fluent transition between seasons. Mountain Brook sees its lowest temperatures of the year in January, with mean figures standing around 35.2°F (1.8°C) to 50.7°F (10.4°C). This contrast is most markedly seen in July when those figures rise steeply to a warm band from 71.1°F (21.7°C) to 91°F (32.8°C), exhibiting the area's hottest months.
Humidity levels in Mountain Brook show some degree of consistency throughout the year. Average relative humidity ranges from 72% in summer to a peak of 79% in December. Among rainfall metrics, values fluctuate relatively moderately across months. The months of June, August, and December see a relatively higher average rainfall at 1.97in, 1.89in, and 1.89in respectively with rest of the months averaging around 1.5in. Rainfall days show a peak in July with 17.6 days, while the winter period of November to January sees a reduction with roughly 10 days.
Snowfall is a rare occurrence in Mountain Brook and is relegated solely to the winter months of December through February. Mountain Brook experiences very limited snowfall with only 0.08in in December and January, and a minimal 0.04in in February. Visibility stands constant at 6 miles throughout the year, not getting obscured by excessive cloud coverage which hovers around 45%, with only a slight increase to 48% in February and a decrease to 30% observed during the summer months.
The best time to visit Mountain Brook
Visitors seeking the most favourable weather conditions would be advised to travel to Mountain Brook between May and June. During this period, daytime temperatures average between 73.4°F (23°C) to 88.5°F (31.4°C), creating a conducive atmosphere for outdoor activities, while the average relative humidity of 73% keeps the air from feeling oppressively heavy.The worst time to visit Mountain Brook
Given the heightened level of climatic demands, the period spanning from mid-July to August could be considered less ideal for those averse to higher temperatures or humid conditions. Average maximum temperatures during this time reach up to 91°F (32.8°C) with heightened humidity levels that average 72%.Spring weather in Mountain Brook
Spring in Mountain Brook is pleasantly warm with increasing daylight. The season sees temperatures rising from an average low of 46°F (7.8°C) in March to a high of 81.3°F (27.4°C) by late May. Rainfall is evenly spread throughout the season, ranging from 1.54in in March to 1.54in in May. With humidity levels from 77% to 73% and an increasing daylight that reaches up to 13.9 hours in May, spring in Mountain Brook can be an exhilarating season.Summer weather in Mountain Brook
Summers in Mountain Brook are characteristically hot and accompanied by relatively high humidity. Average temperatures fluctuate between 68.4°F (20.2°C) to 91°F (32.8°C), making it the hottest season of the year. Rainfall moves to its peak levels, reaching up to 1.97in in June, but decreasing somewhat to 1.89in by August. With more than 14 hours of daylight and an average UV index of 7, these months are appropriate for sun enthusiasts.Autumn weather in Mountain Brook
Autumn in Mountain Brook sees comfortable temperatures, transitioning from the heat of summer to a cooler climate. September averages range between 65.3°F (18.5°C) and 84.9°F (29.4°C), cooling to a more temperate 39.6°F (4.2°C) to 54.5°F (12.5°C) by November. Rainfall in the autumn months is somewhat less than in summer, with October witnessing the lowest levels of the year at 1.06in. This time of year is marked by a reduction in daylight hours with the average falling to 10 by November.Winter weather in Mountain Brook
Winter in Mountain Brook is moderate, with the coldest month of January seeing average temperatures ranging from 35.2°F (1.8°C) to 50.7°F (10.4°C). Rainfall is relatively high during these months, peaking at 1.89in in December. Snowfall is rare and minimal, restricted to the range of 0.04in to 0.08in in the winter months. With the average daylight reaching its shortest at 10 hours and relative humidity peaking at 79% in December, the season's climate is generally mild.Weather in January
With the dawn of the new year comes the coldest month in Mountain Brook, Alabama. An average high and low temperature of 50.7°F (10.4°C) and 35.2°F (1.8°C) respectively resonates with chilling winds reaching a peak speed of 11.6mph (18.7km/h). Weather in January »Weather in February
Following January, February sees a slight rise in temperatures to greet the budding signs of spring. This month's unique characteristic is its significantly fewer sunshine days, resting at 14.9 days. The high relative humidity persists from last month, resulting in foggy mornings and evenings in Mountain Brook. Weather in February »Weather in March
March steps in as the prelude to spring in Mountain Brook, Alabama. The town begins experiencing a more moderate climate, with slightly longer daylight hours compared to the two preceding months. However, this is the period where wind gust moves lightly above 11.7mph (18.8km/h), making it one of the windiest months. Weather in March »Weather in April
April marks the full bloom of spring in Mountain Brook, Alabama. The month experiences a considerable leap in the maximum temperature, making it notably warmer than previous months. The UV index also sees an uptick, rising to 5, indicating the need for sun protection measures for prolonged outdoor activities. Weather in April »Weather in May
As May enters, it delights residents with its quintessential spring climate, characterized by warmer temperatures. Even though rainfall is not at its peak, rain still occurs. The end of May sees the introduction of summer weather, with higher temperatures setting in. Weather in May »Weather in June
June in Mountain Brook is when summer truly asserts itself. The warm weather comes to a boil with the average temperatures soaring to highs of up to 88.5°F (31.4°C). Simultaneously, it's interesting to note that June is also the wettest month with a rainfall of 1.97" (50mm), indicating a pattern of warm days often ending in soft showers. Weather in June »Weather in July
July, being the zenith of summer, hits the highest temperatures of the year with an average high of 91°F (32.8°C). Daylight diminishes slightly compared to June. The UV index reaches its peak, indicating a higher risk of sunburn and eye damage. Weather in July »Weather in August
In August, Mountain Brook experiences a slight dip in temperature, offering a gentle respite from July's heat. Nevertheless, the temperature remains high enough to maintain the summer's character. The month receives a significant amount of rainfall, nearly as much as observed in June with 1.89" (48mm). Weather in August »Weather in September
September marks the transition from summer to the much-awaited autumn season in Mountain Brook. The significant drop in average high temperatures indicates the end of the heat wave from previous months. Rainfall lessens after the spiked amount observed in August. Weather in September »Weather in October
October greets Mountain Brook with full-fledged autumn weather. The city sees a remarkable increase in wind speed, with peaks up to 6.6mph (10.6km/h). The cooling lag from the summer months and the receding rainfall make it an exciting time. Weather in October »Weather in November
November in Mountain Brook experiences a further decline in temperature as the city edges closer to winter. With an average high temperature of 61.9°F (16.6°C), it presents colder days compared to October. Scarves and jackets become the norm as cooling breezes sweep through the city. Weather in November »Weather in December
Bringing the year to a close, December starts to feel like winter in Mountain Brook. With an average high temperature of 54.5°F (12.5°C) and a low of 39.9°F (4.4°C), the difference from November's weather is clearly noticeable. Weather in December »Updated: Aug 31, 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
January proves to be the coldest month, recording an average maximum temperature of 50.7°F (10.4°C) and a minimum temperature of 35.2°F (1.8°C).
In Mountain Brook, during the entire year, the rain falls for 143.1 days and collects up to 18.58" (472mm) of precipitation.
Months with snowfall are January through March, November and December.
January is the month with the most snowfall. Snow falls for 0.8 days and accumulates 0.12" (3mm) of snow.
In Mountain Brook, during the entire year, snow falls for 2.5 days and aggregates up to 0.35" (9mm) of snow.
February has the least sunshine of the year in Mountain Brook, with an average of 4.7h 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 Mountain Brook, snow does not fall in April through October.
The month with the most rainfall is June, when the rain falls for 14.8 days and typically aggregates up to 1.97" (50mm) of precipitation.
With an average of 14h and 18min of daylight, June has the longest days of the year.
July is the warmest month of the year, registering average temperatures as high as 91°F (32.8°C) and as low as 71.1°F (21.7°C).
With an average of 10.7h of sunshine, July has the most sunshine of the year.
The months with the highest UV index in Mountain Brook are July and August, with an average maximum UV index of 7.
October is the least humid month, with an average relative humidity of 71%.
The month with the least rainfall is November, when the rain falls for 7.9 days and typically collects 1.02" (26mm) of precipitation.
December is the most humid month in Mountain Brook, with an average relative humidity of 79%.
With an average of 10h and 0min of daylight, December has the shortest days of the year.
The month with the lowest UV index in Mountain Brook is December, with an average maximum UV index of 2.
Average temperature
Mountain Brook, AL
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (50.7°F).
The month with the highest average low temperature is July (71.1°F).
The coldest month (with the lowest average low temperature) is January (35.2°F).
Average pressure
Mountain Brook, AL
- Average pressure in January:
30.17"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
30.01"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:
30.01"Hg - Average pressure in October:
30.05"Hg - Average pressure in November:
30.15"Hg - Average pressure in December:
30.15"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed
Mountain Brook, AL
- Average wind speed in January:
7.3mph - Average wind speed in February:
7.4mph - Average wind speed in March:
7.3mph - Average wind speed in April:
7.2mph - Average wind speed in May:
5.7mph - Average wind speed in June:
4.8mph
- Average wind speed in July:
4.5mph - Average wind speed in August:
4.5mph - Average wind speed in September:
4.8mph - Average wind speed in October:
6.1mph - Average wind speed in November:
6.5mph - Average wind speed in December:
7mph
The windiest month (with the highest average wind speed) is February (7.4mph).
The calmest months (with the lowest average wind speed) are July and August (4.5mph).
Average humidity
Mountain Brook, AL
The month with the highest relative humidity is December (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Mountain Brook, AL
- Average rainfall in January:
1.54" - Average rainfall in February:
1.61" - Average rainfall in March:
1.54" - Average rainfall in April:
1.81" - Average rainfall in May:
1.54" - Average rainfall in June:
1.97"
- Average rainfall in July:
1.61" - Average rainfall in August:
1.89" - Average rainfall in September:
1.1" - Average rainfall in October:
1.06" - Average rainfall in November:
1.02" - Average rainfall in December:
1.89"
The wettest month (with the highest rainfall) is June (1.97").
The driest month (with the least rainfall) is November (1.02").
Average rainfall days
Mountain Brook, AL
- Average rainfall days in January:
8.7 days - Average rainfall days in February:
10.7 days - Average rainfall days in March:
12.7 days - Average rainfall days in April:
11.4 days - Average rainfall days in May:
12.6 days - Average rainfall days in June:
14.8 days
- Average rainfall days in July:
17.6 days - Average rainfall days in August:
15.7 days - Average rainfall days in September:
12.1 days - Average rainfall days in October:
8.3 days - Average rainfall days in November:
7.9 days - Average rainfall days in December:
10.6 days
The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is November (7.9 days).
Average snowfall
Mountain Brook, AL
The month with the highest snowfall is January (0.12").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Mountain Brook, AL
- Average snowfall days in January:
0.8 days - Average snowfall days in February:
0.8 days - Average snowfall days in March:
0.3 days - Average snowfall days in April:
0 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:
0.2 days - Average snowfall days in December:
0.4 days
The months with the highest number of snowfall days are January and February (0.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Mountain Brook, AL
- 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 0min - Average daylight in May:
13h and 54min - Average daylight in June:
14h and 18min
- Average daylight in July:
14h and 6min - 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:
10h and 0min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in January:
5h and 12min - Average sunshine in February:
4h and 42min - Average sunshine in March:
6h and 18min - Average sunshine in April:
9h and 30min - Average sunshine in May:
10h and 0min - Average sunshine in June:
10h and 36min
- Average sunshine in July:
10h and 42min - Average sunshine in August:
10h and 18min - Average sunshine in September:
8h and 48min - Average sunshine in October:
7h and 30min - Average sunshine in November:
5h and 48min - Average sunshine in December:
4h and 54min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days
Mountain Brook, AL
- Average sunshine days in January:
19.8 days - Average sunshine days in February:
14.9 days - Average sunshine days in March:
16.7 days - Average sunshine days in April:
16.6 days - Average sunshine days in May:
16.4 days - Average sunshine days in June:
12.5 days
- Average sunshine days in July:
11.1 days - Average sunshine days in August:
12.3 days - Average sunshine days in September:
15.7 days - Average sunshine days in October:
20.9 days - Average sunshine days in November:
20.8 days - Average sunshine days in December:
17.5 days
The month with the most sunshine days is October (20.9 days).
The month with the least sunshine days is July (11.1 days).
Average UV index
Mountain Brook, AL
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover
Mountain Brook, AL
The month with the most cloud cover is February (Cloud cover 48).
The months with the least cloud cover are June and September (Cloud cover 30).
Average visibility
Mountain Brook, 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).
