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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 Griffen, Iowa, is a freezing cold winter month, with an average temperature varying between 13.1°F (-10.5°C) and 26.4°F (-3.1°C). In Griffen, the month of January is known for its lowest average temperatures, reaching a high of 26.4°F (-3.1°C) and a low of 13.1°F (-10.5°C). Weather in January »
Weather in February
February, the last month of the winter in Griffen, is also a subzero cold month, with an average temperature fluctuating between 17.1°F (-8.3°C) and 30.6°F (-0.8°C). The advent of February brings an average high-temperature of a still freezing cold 30.6°F (-0.8°C), almost identical to the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Griffen, Iowa, with an average temperature ranging between min 30.7°F (-0.7°C) and max 45.9°F (7.7°C). As Griffen transitions into March, the average high-temperature shows a marked escalation, increasing from a freezing cold 30.6°F (-0.8°C) in February to a frosty 45.9°F (7.7°C). Weather in March »
Weather in April
April in Griffen, Iowa, is a refreshing spring month, with an average temperature varying between 58.6°F (14.8°C) and 41.9°F (5.5°C). The transition from March to April brings a temperature rise, with average high-temperatures increasing from a chilly 45.9°F (7.7°C) to a moderate 58.6°F (14.8°C). Weather in April »
Weather in May
May, the last month of the spring in Griffen, is an agreeable month, with an average temperature ranging between max 69.4°F (20.8°C) and min 53.1°F (11.7°C). The commencement of May sees a shift in the average high-temperature, moving from a mild 58.6°F (14.8°C) in April to a pleasant 69.4°F (20.8°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Griffen, Iowa, with an average temperature varying between 79°F (26.1°C) and 62.2°F (16.8°C). With the onset of June, Griffen experiences a temperature shift, with the average high-temperature moving from an agreeable 69.4°F (20.8°C) in May to a warm 79°F (26.1°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Griffen, Iowa, with an average temperature varying between 64.4°F (18°C) and 81.3°F (27.4°C). Griffen experiences its highest average temperatures in July, reaching a peak of 81.3°F (27.4°C) and a minimum of 64.4°F (18°C). The heat index in July is computed to be a hot 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in Griffen, is another warm month, with temperature in the range of an average low of 61.7°F (16.5°C) and an average high of 79.9°F (26.6°C). The arrival of August coincides with an average high-temperature of a still moderately hot 79.9°F (26.6°C), indicating a minimal shift from July's 81.3°F (27.4°C). Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Griffen, Iowa, with an average temperature ranging between min 55.8°F (13.2°C) and max 74.8°F (23.8°C). September's beginning signals an average high-temperature of a still warm 74.8°F (23.8°C), barely different from August's 79.9°F (26.6°C). Weather in September »
Weather in October
October, like September, is another refreshing autumn month in Griffen, Iowa, with temperature in the range of an average low of 44.1°F (6.7°C) and an average high of 59.9°F (15.5°C). Griffen sees a considerable decrease in average high-temperatures during October, falling from a moderately hot 74.8°F (23.8°C) in September to a refreshing 59.9°F (15.5°C). Weather in October »
Weather in November
November, the last month of the autumn in Griffen, is also a frosty month, with an average temperature ranging between max 45.5°F (7.5°C) and min 32.2°F (0.1°C). In November, the average high-temperature decreases considerably from a refreshing 59.9°F (15.5°C) in October to a frosty 45.5°F (7.5°C). Weather in November »
Weather in December
The first month of the winter, December, is also a wintry month in Griffen, Iowa, with an average temperature ranging between min 21°F (-6.1°C) and max 32.2°F (0.1°C). Onset of December comes with a temperature decline, the average high falling from a frosty 45.5°F (7.5°C) in November to a wintry 32.2°F (0.1°C). Weather in December »
Updated: Jul 7, 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 month?
The coldest period is January, when temperatures fluctuate between an average high of 26.4°F (-3.1°C) and a low of 13.1°F (-10.5°C).
What is the most humid month?
January is the most humid month, with an average relative humidity of 84%.
What is the driest month in Griffen?
January is the month with the least rainfall. Rain falls for 3.9 days and accumulates 0.67" (17mm) of precipitation.
How many days does it rain?
Throughout the year, there are 123.3 rainfall days, and 20.98" (533mm) of precipitation is accumulated.
When does it snow?
January through May, October through December are months with snowfall.
How much does it snow?
Throughout the year, there are 39.9 snowfall days, and 10.91" (277mm) of snow is accumulated.
What is the month with the least sunshine in Griffen?
January has the least sunshine of the year in Griffen, with an average of 4h of sunshine.
When is the lowest UV index?
The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2.
When does it snow the most?
February is the month with the most snowfall. Snow falls for 9.2 days and accumulates 3.07" (78mm) of snow.
When is Daylight Saving Time (DST)?
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?
June is the month with the most rainfall. Rain falls for 17.4 days and accumulates 3.35" (85mm) of precipitation.
When it does not snow?
June through September are months without snowfall.
When are the longest days?
With an average of 15h and 12min of daylight, June has the longest days of the year.
What are the months with the highest UV index in Griffen?
The months with the highest UV index are June and July, with an average maximum UV index of 6.
What time of the year is the hottest?
July registers as the month with the average highest temperatures, reaching 81.3°F (27.4°C) at its peak and 64.4°F (18°C) at the lowest.
What month has the most sunshine in Griffen?
July has the most sunshine of the year, with an average of 10.1h of sunshine.
What is the least humid month?
The least humid month in Griffen is October, with an average relative humidity of 69%.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 12min of daylight.
Average temperature
Griffen, IA
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (26.4°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 (13.1°F).
Average pressure
Griffen, IA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.14"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.93"Hg - Average pressure in June:
29.88"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
30"Hg - Average pressure in November:
30.08"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed
Griffen, IA
- Average wind speed in January:
10.5mph - Average wind speed in February:
10.5mph - Average wind speed in March:
10.5mph - Average wind speed in April:
10.7mph - Average wind speed in May:
9.1mph - Average wind speed in June:
8.2mph
- Average wind speed in July:
7.1mph - Average wind speed in August:
7.1mph - Average wind speed in September:
8.2mph - Average wind speed in October:
9.7mph - Average wind speed in November:
10.3mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity
Griffen, IA
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (69%).
Average rainfall
Griffen, IA
- Average rainfall in January:
0.67" - Average rainfall in February:
0.79" - Average rainfall in March:
1.14" - Average rainfall in April:
2.05" - Average rainfall in May:
3.23" - Average rainfall in June:
3.35"
- Average rainfall in July:
1.97" - Average rainfall in August:
2.05" - Average rainfall in September:
2.4" - Average rainfall in October:
1.57" - Average rainfall in November:
0.91" - Average rainfall in December:
0.87"
The wettest month (with the highest rainfall) is June (3.35").
The driest month (with the least rainfall) is January (0.67").
Average rainfall days
Griffen, IA
- Average rainfall days in January:
3.9 days - Average rainfall days in February:
3.2 days - Average rainfall days in March:
9.1 days - Average rainfall days in April:
13.3 days - Average rainfall days in May:
16.5 days - Average rainfall days in June:
17.4 days
- Average rainfall days in July:
15 days - Average rainfall days in August:
13.1 days - Average rainfall days in September:
11.1 days - Average rainfall days in October:
8.6 days - Average rainfall days in November:
7.4 days - Average rainfall days in December:
4.7 days
The month with the highest number of rainy days is June (17.4 days).
The month with the least rainy days is February (3.2 days).
Average snowfall
Griffen, IA
- Average snowfall in January:
2.91" - Average snowfall in February:
3.07" - Average snowfall in March:
0.98" - Average snowfall in April:
0.71" - Average snowfall in May:
0.31" - Average snowfall in June:
0"
The month with the highest snowfall is February (3.07").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Griffen, IA
- Average snowfall days in January:
10.9 days - Average snowfall days in February:
9.2 days - Average snowfall days in March:
5.7 days - Average snowfall days in April:
1.5 days - Average snowfall days in May:
0.3 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:
0.8 days - Average snowfall days in November:
2.9 days - Average snowfall days in December:
8.6 days
The month with the highest number of snowfall days is January (10.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Griffen, 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 4min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 5min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 3min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
9h and 4min - Average sunshine in September:
9h and 2min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 3min - Average sunshine in December:
4h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days
Griffen, IA
- Average sunshine days in January:
18.4 days - Average sunshine days in February:
15.7 days - Average sunshine days in March:
15.7 days - Average sunshine days in April:
13.7 days - Average sunshine days in May:
12 days - Average sunshine days in June:
10.5 days
- Average sunshine days in July:
12.3 days - Average sunshine days in August:
15.6 days - Average sunshine days in September:
16.5 days - Average sunshine days in October:
19.5 days - Average sunshine days in November:
18.8 days - Average sunshine days in December:
19 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is June (10.5 days).
Average UV index
Griffen, IA
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover
Griffen, IA
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility
Griffen, IA
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Griffen, Iowa, USA
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