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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, the same as December, in Mount Vernon, Iowa, is a freezing cold winter month, with temperature in the range of an average high of 26.2°F (-3.2°C) and an average low of 14.2°F (-9.9°C). January is the month that records the lowest temperatures, with averages ranging from a high of 26.2°F (-3.2°C) to a low of 14.2°F (-9.9°C). Weather in January »
Weather in February
February, the last month of the winter in Mount Vernon, is also a subzero cold month, with an average temperature ranging between max 30.6°F (-0.8°C) and min 17.4°F (-8.1°C). The advent of February presents an average high-temperature of a still subzero cold 30.6°F (-0.8°C), maintaining a close correlation with the preceding month. Weather in February »
Weather in March
March, the first month of the spring in Mount Vernon, is a chilly month, with temperature in the range of an average high of 45.5°F (7.5°C) and an average low of 30.7°F (-0.7°C). With the onset of March, Mount Vernon experiences a distinct temperature rise, with the average high-temperature advancing from February's subzero cold 30.6°F (-0.8°C) to a frosty 45.5°F (7.5°C). Weather in March »
Weather in April
April is a moderate spring month in Mount Vernon, Iowa, with temperature in the range of an average high of 57.9°F (14.4°C) and an average low of 41°F (5°C). A shift in the average high-temperature is noticeable in April, changing from a chilly 45.5°F (7.5°C) in March to a moderate 57.9°F (14.4°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Mount Vernon, Iowa, with an average temperature fluctuating between 68.9°F (20.5°C) and 52.2°F (11.2°C). May brings an increase in the average high-temperature, progressing from a moderate 57.9°F (14.4°C) in April to an agreeable 68.9°F (20.5°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Mount Vernon, Iowa, with temperature in the range of an average high of 77.9°F (25.5°C) and an average low of 61.5°F (16.4°C). As June arrives, a rise in the average high-temperature is observed, moving from an agreeable 68.9°F (20.5°C) in May to a moderately hot 77.9°F (25.5°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Mount Vernon, Iowa, with temperature in the range of an average low of 64.4°F (18°C) and an average high of 80.2°F (26.8°C). Mount Vernon reaches its highest average temperatures in July, measuring 80.2°F (26.8°C) at the peak and 64.4°F (18°C) at the lowest. Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Mount Vernon, Iowa, with temperature in the range of an average high of 79.3°F (26.3°C) and an average low of 61.7°F (16.5°C). Mount Vernon's average high-temperature in August is a still warm 79.3°F (26.3°C), marking an insignificant difference from the 80.2°F (26.8°C) of July. Weather in August »
Weather in September
September, the first month of the autumn in Mount Vernon, is also a moderately hot month, with an average temperature ranging between max 74.1°F (23.4°C) and min 54.9°F (12.7°C). Stepping into September, Mount Vernon records an average high-temperature of a still warm 74.1°F (23.4°C), almost consistent with August. Weather in September »
Weather in October
October, the same as September, in Mount Vernon, Iowa, is another refreshing autumn month, with an average temperature varying between 59.9°F (15.5°C) and 43.9°F (6.6°C). As October arrives, Mount Vernon's weather displays a decrease in high-temperatures, transitioning from September's moderately hot 74.1°F (23.4°C) to a mild 59.9°F (15.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Mount Vernon, Iowa, with an average temperature fluctuating between 45.3°F (7.4°C) and 31.8°F (-0.1°C). Mount Vernon's November weather is characterized by a distinct downswing in high-temperatures, falling from October's refreshing 59.9°F (15.5°C) to a chilly 45.3°F (7.4°C). Weather in November »
Weather in December
December, the first month of the winter in Mount Vernon, is also an icy month, with an average temperature fluctuating between 22.3°F (-5.4°C) and 33.1°F (0.6°C). The onset of December comes with a shift in the average high-temperature, falling from a chilly 45.3°F (7.4°C) in November to a wintry 33.1°F (0.6°C). Weather in December »
Updated: Jul 17, 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
What is the coldest time of year?
January is the month that records the lowest temperatures, with averages ranging from a high of 26.2°F (-3.2°C) to a low of 14.2°F (-9.9°C).
What is the most humid month?
The most humid month is January, with an average relative humidity of 85%.
What is the driest month?
The month with the least rainfall is January, when the rain falls for 5.2 days and typically collects 1.34" (34mm) of precipitation.
How many days does it rain?
In Mount Vernon, during the entire year, the rain falls for 147.9 days and collects up to 31.57" (802mm) of precipitation.
When does it snow?
January through April, October through December are months with snowfall.
What is the snowiest month in Mount Vernon?
The month with the most snowfall in Mount Vernon is January, when snow falls for 12.7 days and typically aggregates up to 5.79" (147mm) of snow.
How many days does it snow?
In Mount Vernon, during the entire year, snow falls for 44 days and aggregates up to 18.35" (466mm) of snow.
What is the month with the least sunshine?
With an average of 4h of sunshine, January has the least sunshine of the year.
When is Daylight Saving Time (DST) in Mount Vernon?
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 rainiest month?
The month with the most rainfall is May, when the rain falls for 19 days and typically aggregates up to 5" (127mm) of precipitation.
When it does not snow?
In Mount Vernon, snow does not fall in May through September.
When are the longest days?
The month with the longest days is June, with an average of 15h and 12min of daylight.
What part of the year is the hottest?
Temperature records mark July as the warmest month, with highs averaging 80.2°F (26.8°C) and lows at 64.4°F (18°C).
What is the month with the most sunshine?
July and August, with an average of 9.8h of sunshine, are months with the most sunshine.
What is the month with the highest UV index in Mount Vernon?
July is the month with the highest UV index, with an average maximum UV index of 6.
What is the least humid month?
October is the least humid month, with an average relative humidity of 73%.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 12min of daylight.
What is the month with the lowest UV index?
With an average maximum UV index of 1, December is the month with the lowest UV index.
Average temperature
Mount Vernon, IA
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (26.2°F).
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (14.2°F).
Average pressure
Mount Vernon, IA
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.9"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
Mount Vernon, IA
- Average wind speed in January:
10.6mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10.5mph - Average wind speed in April:
10.8mph - Average wind speed in May:
9.1mph - Average wind speed in June:
7.9mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity
Mount Vernon, IA
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (73%).
Average rainfall
Mount Vernon, IA
- Average rainfall in January:
1.34" - Average rainfall in February:
1.38" - Average rainfall in March:
2.05" - Average rainfall in April:
3.43" - Average rainfall in May:
5" - Average rainfall in June:
4.37"
- Average rainfall in July:
3.31" - Average rainfall in August:
2.09" - Average rainfall in September:
2.72" - Average rainfall in October:
2.56" - Average rainfall in November:
1.77" - Average rainfall in December:
1.57"
The wettest month (with the highest rainfall) is May (5").
The driest month (with the least rainfall) is January (1.34").
Average rainfall days
Mount Vernon, IA
- Average rainfall days in January:
5.2 days - Average rainfall days in February:
5.2 days - Average rainfall days in March:
12.1 days - Average rainfall days in April:
15.9 days - Average rainfall days in May:
19 days - Average rainfall days in June:
18.8 days
- Average rainfall days in July:
17.6 days - Average rainfall days in August:
14 days - Average rainfall days in September:
12 days - Average rainfall days in October:
12.2 days - Average rainfall days in November:
9.1 days - Average rainfall days in December:
6.8 days
The month with the highest number of rainy days is May (19 days).
The months with the least rainy days are January and February (5.2 days).
Average snowfall
Mount Vernon, IA
The month with the highest snowfall is January (5.79").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Mount Vernon, IA
- Average snowfall days in January:
12.7 days - Average snowfall days in February:
10.3 days - Average snowfall days in March:
6.1 days - Average snowfall days in April:
1.4 days - Average snowfall days in May:
0.1 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:
0.7 days - Average snowfall days in November:
3.2 days - Average snowfall days in December:
9.5 days
The month with the highest number of snowfall days is January (12.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Mount Vernon, IA
- Average daylight in January:
9h and 3min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
4h and 0min - Average sunshine in February:
4h and 1min - Average sunshine in March:
6h and 2min - Average sunshine in April:
7h and 3min - Average sunshine in May:
8h and 2min - Average sunshine in June:
9h and 3min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
9h and 5min - Average sunshine in September:
9h and 1min - Average sunshine in October:
5h and 2min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 2min
The months with the most sunshine are July and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days
Mount Vernon, IA
- Average sunshine days in January:
15.5 days - Average sunshine days in February:
14 days - Average sunshine days in March:
13.9 days - Average sunshine days in April:
11.2 days - Average sunshine days in May:
9.2 days - Average sunshine days in June:
8.1 days
- Average sunshine days in July:
9.6 days - Average sunshine days in August:
13.8 days - Average sunshine days in September:
15.9 days - Average sunshine days in October:
16.9 days - Average sunshine days in November:
17 days - Average sunshine days in December:
16.8 days
The month with the most sunshine days is November (17 days).
The month with the least sunshine days is June (8.1 days).
Average UV index
Mount Vernon, IA
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Mount Vernon, IA
The month with the most cloud cover is January (Cloud cover 58).
The months with the least cloud cover are August and September (Cloud cover 31).
Average visibility
Mount Vernon, IA
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
Mount Vernon, Iowa, USA
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