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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, like December, is another subzero cold winter month in Merrimac, Iowa, with an average temperature ranging between max 29.7°F (-1.3°C) and min 17.4°F (-8.1°C). With average high and low temperatures of 29.7°F (-1.3°C) and 17.4°F (-8.1°C) respectively, January is Merrimac's coldest month. Weather in January »
Weather in February
February, the last month of the winter in Merrimac, is a wintry month, with an average temperature varying between 34.3°F (1.3°C) and 21°F (-6.1°C). February welcomes an average high-temperature of a cold 34.3°F (1.3°C), not much different from the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Merrimac, Iowa, with an average temperature fluctuating between 48.2°F (9°C) and 33.3°F (0.7°C). Merrimac's transition into March sees a rise in the average high-temperature, advancing from a wintry 34.3°F (1.3°C) in February to a frosty 48.2°F (9°C). Weather in March »
Weather in April
April is a refreshing spring month in Merrimac, Iowa, with temperature in the range of an average high of 60.8°F (16°C) and an average low of 43.3°F (6.3°C). As Merrimac transitions into April, a rise in the average high-temperature is observed, moving from a frosty 48.2°F (9°C) in March to a refreshing 60.8°F (16°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Merrimac, Iowa, with an average temperature ranging between max 70.9°F (21.6°C) and min 53.8°F (12.1°C). May brings a rise in the average high-temperature, transitioning from April's enjoyable 60.8°F (16°C) to an agreeable 70.9°F (21.6°C). Weather in May »
Weather in June
June, the first month of the summer in Merrimac, is a moderately hot month, with temperature in the range of an average low of 63.7°F (17.6°C) and an average high of 79.9°F (26.6°C). The start of June signals an increase in the average high-temperature, moving from an agreeable 70.9°F (21.6°C) in May to a warm 79.9°F (26.6°C). Weather in June »
Weather in July
July, like June, in Merrimac, Iowa, is a moderately hot summer month, with temperature in the range of an average low of 65.3°F (18.5°C) and an average high of 82.4°F (28°C). The warmest period tends to be July, when average temperatures fluctuate between a high of 82.4°F (28°C) and a low of 65.3°F (18.5°C). The heat index value for July is evaluated at a tropical 91.4°F (33°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Merrimac, Iowa, with an average temperature varying between 81.7°F (27.6°C) and 63.3°F (17.4°C). Merrimac's weather in August, with an average high-temperature of a still warm 81.7°F (27.6°C), subtly shifts from July's 82.4°F (28°C). Weather in August »
Weather in September
September, the first month of the autumn in Merrimac, is still a warm month, with an average temperature varying between 56.7°F (13.7°C) and 76.3°F (24.6°C). The onset of September results in a small decrease in the average high-temperature, moderately receding from a warm 81.7°F (27.6°C) in August to a still moderately hot 76.3°F (24.6°C). Weather in September »
Weather in October
October, like September, in Merrimac, Iowa, is another refreshing autumn month, with temperature in the range of an average high of 61.7°F (16.5°C) and an average low of 45.7°F (7.6°C). The changeover to October signals a significant decrease in the average high-temperature, dropping from a moderately hot 76.3°F (24.6°C) in September to a comfortable 61.7°F (16.5°C). Weather in October »
Weather in November
November, the last month of the autumn in Merrimac, is also a frosty month, with an average temperature fluctuating between 34°F (1.1°C) and 48°F (8.9°C). Merrimac experiences a temperature shift at the start of November, with average high-temperatures adjusting from a comfortable 61.7°F (16.5°C) in October to a chilly 48°F (8.9°C). Weather in November »
Weather in December
December, the first month of the winter in Merrimac, is still a cold month, with temperature in the range of an average low of 24.6°F (-4.1°C) and an average high of 36°F (2.2°C). In Merrimac, the average high-temperature in December decreases from a chilly 48°F (8.9°C) in November to a cold 36°F (2.2°C). Weather in December »
Updated: Jul 29, 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 time of the year is the coldest?
January is the month when Merrimac experiences its coldest temperatures, averaging a high of 29.7°F (-1.3°C) and a low of 17.4°F (-8.1°C).
How many days does it rain?
Throughout the year, there are 140.1 rainfall days, and 29.92" (760mm) of precipitation is accumulated.
When does it snow?
Months with snowfall are January through April, October through December.
What is the snowiest month?
The month with the most snowfall is January, when snow falls for 9.6 days and typically aggregates up to 4.76" (121mm) of snow.
How much does it snow?
In Merrimac, during the entire year, snow falls for 30.7 days and aggregates up to 15" (381mm) of snow.
What is the month with the least sunshine?
The month with the least sunshine is January, with an average of 4h of sunshine.
What is the month with the lowest UV index?
January is the month with the lowest UV index, with an average maximum UV index of 1.
What is the driest month?
February and December are months with the least rain when the rain falls for 4.6 days and typically aggregates up to 1.38" (35mm) of rain.
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 in Merrimac?
The month with the most rainfall is May, when the rain falls for 18.3 days and typically aggregates up to 4.29" (109mm) of precipitation.
When it does not snow?
May through September are months without snowfall.
When are the longest days?
With an average of 15h and 6min of daylight, June has the longest days of the year.
What is the month with the highest UV index?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What are the warmest months?
In Merrimac, July registers the highest temperatures, averaging 82.4°F (28°C) at the peak and 65.3°F (18.5°C) at the lowest.
What is the most humid month in Merrimac?
With an average relative humidity of 83%, July is the most humid month.
What month has the most sunshine?
July has the most sunshine of the year, with an average of 10h of sunshine.
What is the least humid month?
The least humid month is October, with an average relative humidity of 71%.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 18min of daylight.
Average temperature
Merrimac, IA
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (29.7°F).
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure
Merrimac, IA
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.13"Hg - Average pressure in March:
30.07"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:
30.01"Hg - Average pressure in November:
30.1"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
Merrimac, IA
- Average wind speed in January:
10.7mph - Average wind speed in February:
10.5mph - Average wind speed in March:
10.6mph - Average wind speed in April:
10.6mph - Average wind speed in May:
8.9mph - Average wind speed in June:
7.9mph
- Average wind speed in July:
6.9mph - Average wind speed in August:
6.9mph - Average wind speed in September:
7.9mph - Average wind speed in October:
9.6mph - Average wind speed in November:
10.4mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.9mph).
Average humidity
Merrimac, IA
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Merrimac, IA
- Average rainfall in January:
1.42" - Average rainfall in February:
1.38" - Average rainfall in March:
2.2" - Average rainfall in April:
3.27" - Average rainfall in May:
4.29" - Average rainfall in June:
4.17"
The wettest month (with the highest rainfall) is May (4.29").
The driest months (with the least rainfall) are February and December (1.38").
Average rainfall days
Merrimac, IA
- Average rainfall days in January:
5.3 days - Average rainfall days in February:
4.6 days - Average rainfall days in March:
13 days - Average rainfall days in April:
14.6 days - Average rainfall days in May:
18.3 days - Average rainfall days in June:
17.1 days
- Average rainfall days in July:
15.5 days - Average rainfall days in August:
13.1 days - Average rainfall days in September:
11.5 days - Average rainfall days in October:
11.3 days - Average rainfall days in November:
8.5 days - Average rainfall days in December:
7.3 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (4.6 days).
Average snowfall
Merrimac, IA
The month with the highest snowfall is January (4.76").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Merrimac, IA
- Average snowfall days in January:
9.6 days - Average snowfall days in February:
7.9 days - Average snowfall days in March:
4.3 days - Average snowfall days in April:
0.9 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:
0.4 days - Average snowfall days in November:
1.6 days - Average snowfall days in December:
6 days
The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Merrimac, IA
- Average daylight in January:
9h and 4min - 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 3min - 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 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
4h - Average sunshine in February:
4h and 2min - Average sunshine in March:
6h and 2min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 5min
- Average sunshine in July:
10h - Average sunshine in August:
9h and 5min - Average sunshine in September:
9h and 2min - Average sunshine in October:
5h and 2min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 3min
The month with the most sunshine is July (Average sunshine: 10h).
The month with the least sunshine is January (Average sunshine: 4h).
Average sunshine days
Merrimac, IA
- Average sunshine days in January:
16.2 days - Average sunshine days in February:
15.3 days - Average sunshine days in March:
14.3 days - Average sunshine days in April:
13.3 days - Average sunshine days in May:
10.6 days - Average sunshine days in June:
10.7 days
- Average sunshine days in July:
13 days - Average sunshine days in August:
14.8 days - Average sunshine days in September:
16.5 days - Average sunshine days in October:
18.4 days - Average sunshine days in November:
18.3 days - Average sunshine days in December:
18 days
The month with the most sunshine days is October (18.4 days).
The month with the least sunshine days is May (10.6 days).
Average UV index
Merrimac, IA
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Merrimac, IA
The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are July, August and September (Cloud cover 31).
Average visibility
Merrimac, 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).
Merrimac, Iowa, USA
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