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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 a freezing cold winter month in Portsmouth, Iowa, with an average temperature ranging between min 14.5°F (-9.7°C) and max 27.3°F (-2.6°C). The month of January, characterized by an average high of 27.3°F (-2.6°C) and a low of 14.5°F (-9.7°C), is recognized as the coldest. Weather in January »
Weather in February
The last month of the winter, February, is another freezing cold month in Portsmouth, Iowa, with an average temperature fluctuating between 31.5°F (-0.3°C) and 18°F (-7.8°C). In February, Portsmouth experiences a barely noticeable shift in meteorological conditions, with average high-temperatures moving from 27.3°F (-2.6°C) in January to a still subzero cold 31.5°F (-0.3°C). Weather in February »
Weather in March
March, the first month of the spring in Portsmouth, is a chilly month, with an average temperature varying between 46.9°F (8.3°C) and 31.8°F (-0.1°C). The arrival of March brings a significant change in Portsmouth's weather, with average high-temperatures climbing from February's subzero cold 31.5°F (-0.3°C) to a frosty 46.9°F (8.3°C). Weather in March »
Weather in April
April in Portsmouth, Iowa, is a mild spring month, with an average temperature varying between 58.8°F (14.9°C) and 42.3°F (5.7°C). A rise in the average high-temperature is observed during April, moving from a chilly 46.9°F (8.3°C) in March to a refreshing 58.8°F (14.9°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Portsmouth, Iowa, with temperature in the range of an average high of 69.4°F (20.8°C) and an average low of 52.9°F (11.6°C). The shift from April to May sees an increase in the average high-temperature, transitioning from a mild 58.8°F (14.9°C) to a pleasant 69.4°F (20.8°C). Weather in May »
Weather in June
June, the first month of the summer in Portsmouth, is a moderately hot month, with an average temperature ranging between max 79.3°F (26.3°C) and min 63°F (17.2°C). June signals a shift in the average high-temperature, moving from May's agreeable 69.4°F (20.8°C) to a moderately hot 79.3°F (26.3°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Portsmouth, Iowa, with an average temperature varying between 82.6°F (28.1°C) and 64.9°F (18.3°C). With an average high-temperature of 82.6°F (28.1°C) and an average low-temperature of 64.9°F (18.3°C), July is the warmest month. For most parts of July, the heat index is calculated to be a tropical 89.6°F (32°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Portsmouth, Iowa, with an average temperature ranging between max 80.2°F (26.8°C) and min 62.1°F (16.7°C). Portsmouth's shift into August sets the average high-temperature at a still moderately hot 80.2°F (26.8°C), a figure that deviates only slightly from July's 82.6°F (28.1°C). Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Portsmouth, Iowa, with temperature in the range of an average low of 55.9°F (13.3°C) and an average high of 75°F (23.9°C). Portsmouth observes an average high-temperature of a still moderately hot 75°F (23.9°C) in September, barely different from 80.2°F (26.8°C) in August. Weather in September »
Weather in October
October, the same as September, in Portsmouth, Iowa, is another refreshing autumn month, with an average temperature varying between 44.1°F (6.7°C) and 59.7°F (15.4°C). With the onset of October, Portsmouth experiences a noticeable temperature shift, with the average high-temperature receding from a moderately hot 75°F (23.9°C) in September to a mild 59.7°F (15.4°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Portsmouth, Iowa, with an average temperature ranging between min 32.2°F (0.1°C) and max 46.2°F (7.9°C). November suggests a modest reduction in the average high-temperature, shifting from a mild 59.7°F (15.4°C) in October to a chilly 46.2°F (7.9°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Portsmouth, Iowa, with an average temperature ranging between max 32.2°F (0.1°C) and min 20.8°F (-6.2°C). The shift to December brings a decrease in the average high-temperature, falling from a frosty 46.2°F (7.9°C) in November to a cold 32.2°F (0.1°C). Weather in December »
[Resources]Frequently asked questions
What is the coldest month in Portsmouth?
Portsmouth experiences its average lowest temperatures in January, reaching a peak of 27.3°F (-2.6°C) and a minimum of 14.5°F (-9.7°C).
What is the most humid month in Portsmouth?
The most humid month in Portsmouth, Iowa, is January, with an average relative humidity of 83%.
What is the driest month in Portsmouth?
January is the month with the least rainfall in Portsmouth. Rain falls for 3.2 days and accumulates 0.43" (11mm) of precipitation.
How much does it rain in Portsmouth?
In Portsmouth, during the entire year, the rain falls for 113.5 days and collects up to 15.71" (399mm) of precipitation.
When does it snow in Portsmouth?
Months with snowfall in Portsmouth, Iowa, are January through May, October through December.
How much does it snow in Portsmouth?
Throughout the year, in Portsmouth, Iowa, there are 31.5 snowfall days, and 7.13" (181mm) of snow is accumulated.
What is the month with the least sunshine in Portsmouth?
The month with the least sunshine is January, with an average of 4.5h of sunshine.
When is the lowest UV index in Portsmouth?
The months with the lowest UV index in Portsmouth, Iowa, are January, February, October through December, with an average maximum UV index of 2.
When does it snow the most in Portsmouth?
The month with the most snowfall in Portsmouth is February, when snow falls for 7.3 days and typically aggregates up to 2.09" (53mm) of snow.
When is Daylight Saving Time (DST) in Portsmouth?
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 Portsmouth?
June is the month with the most rainfall in Portsmouth. Rain falls for 16.1 days and accumulates 2.64" (67mm) of precipitation.
When it does not snow in Portsmouth?
In Portsmouth, Iowa, snow does not fall in June through September.
When are the longest days in Portsmouth?
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 in Portsmouth?
The months with the highest UV index in Portsmouth, Iowa, are June through August, with an average maximum UV index of 6.
What month is the hottest in Portsmouth?
July, noted for its average high-temperature of 82.6°F (28.1°C) and an average low-temperature of 64.9°F (18.3°C), is considered the warmest month.
What month has the most sunshine in Portsmouth?
July has the most sunshine of the year, with an average of 10.4h of sunshine.
What is the least humid month in Portsmouth?
October is the least humid month, with an average relative humidity of 68%.
What is the month with the shortest days in Portsmouth?
December has the shortest days of the year in Portsmouth, Iowa, with an average of 9h and 12min of daylight.
Average temperature
Portsmouth, IA
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (27.3°F).
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (14.5°F).
Average pressure
Portsmouth, IA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.14"Hg - Average pressure in March:
30.06"Hg - Average pressure in April:
29.92"Hg - Average pressure in May:
29.92"Hg - Average pressure in June:
29.87"Hg
- Average pressure in July:
29.95"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
30"Hg - Average pressure in October:
30"Hg - Average pressure in November:
30.08"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed
Portsmouth, IA
- Average wind speed in January:
10.6mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10.7mph - Average wind speed in April:
10.9mph - Average wind speed in May:
9.3mph - Average wind speed in June:
8.5mph
- Average wind speed in July:
7.2mph - Average wind speed in August:
7.4mph - Average wind speed in September:
8.5mph - Average wind speed in October:
9.7mph - Average wind speed in November:
10.4mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity
Portsmouth, IA
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (68%).
Average rainfall
Portsmouth, IA
- Average rainfall in January:
0.43" - Average rainfall in February:
0.47" - Average rainfall in March:
0.91" - Average rainfall in April:
1.26" - Average rainfall in May:
2.6" - Average rainfall in June:
2.64"
- Average rainfall in July:
1.5" - Average rainfall in August:
1.93" - Average rainfall in September:
1.65" - Average rainfall in October:
1.06" - Average rainfall in November:
0.55" - Average rainfall in December:
0.71"
The wettest month (with the highest rainfall) is June (2.64").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days
Portsmouth, IA
- Average rainfall days in January:
3.2 days - Average rainfall days in February:
2.8 days - Average rainfall days in March:
8.8 days - Average rainfall days in April:
12.8 days - Average rainfall days in May:
15.7 days - Average rainfall days in June:
16.1 days
- Average rainfall days in July:
13.1 days - Average rainfall days in August:
12.3 days - Average rainfall days in September:
10.5 days - Average rainfall days in October:
8.5 days - Average rainfall days in November:
5.5 days - Average rainfall days in December:
4.2 days
The month with the highest number of rainy days is June (16.1 days).
The month with the least rainy days is February (2.8 days).
Average snowfall
Portsmouth, IA
- Average snowfall in January:
1.57" - Average snowfall in February:
2.09" - Average snowfall in March:
1.22" - Average snowfall in April:
0.28" - Average snowfall in May:
0.16" - Average snowfall in June:
0"
The month with the highest snowfall is February (2.09").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Portsmouth, IA
- Average snowfall days in January:
8.3 days - Average snowfall days in February:
7.3 days - Average snowfall days in March:
4.8 days - Average snowfall days in April:
1 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:
0.7 days - Average snowfall days in November:
3 days - Average snowfall days in December:
6.1 days
The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Portsmouth, 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 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 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
4h and 3min - Average sunshine in February:
5h and 1min - Average sunshine in March:
6h and 2min - Average sunshine in April:
8h and 1min - Average sunshine in May:
8h and 5min - Average sunshine in June:
9h and 5min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
9h and 5min - Average sunshine in September:
9h and 1min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 5min - Average sunshine in December:
4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days
Portsmouth, IA
- Average sunshine days in January:
20.1 days - Average sunshine days in February:
17.8 days - Average sunshine days in March:
17.9 days - Average sunshine days in April:
15 days - Average sunshine days in May:
12.8 days - Average sunshine days in June:
11.4 days
- Average sunshine days in July:
12.7 days - Average sunshine days in August:
15.5 days - Average sunshine days in September:
16.5 days - Average sunshine days in October:
20.5 days - Average sunshine days in November:
21.3 days - Average sunshine days in December:
21.6 days
The month with the most sunshine days is December (21.6 days).
The month with the least sunshine days is June (11.4 days).
Average UV index
Portsmouth, IA
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover
Portsmouth, IA
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility
Portsmouth, IA
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).
Portsmouth, Iowa, USA
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