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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 Janesville, Iowa, is a freezing cold winter month, with temperature in the range of an average low of 11.3°F (-11.5°C) and an average high of 23.9°F (-4.5°C). Janesville's January weather, with an average high temperature of 23.9°F (-4.5°C) and an average low temperature of 11.3°F (-11.5°C), tends to be the coldest of the year. Weather in January »
Weather in February
The last month of the winter, February, is another freezing cold month in Janesville, Iowa, with temperature in the range of an average low of 14.5°F (-9.7°C) and an average high of 27.7°F (-2.4°C). Janesville, Iowa, experiences an average high-temperature of a still freezing cold 27.7°F (-2.4°C) in February, marking an insignificant shift from 23.9°F (-4.5°C) in January. Weather in February »
Weather in March
March, the first month of the spring in Janesville, is a chilly month, with an average temperature varying between 28.9°F (-1.7°C) and 43°F (6.1°C). A noticeable upsurge in temperatures is seen as February gives way to March, with average highs moving from a subzero cold 27.7°F (-2.4°C) to a frosty 43°F (6.1°C). Weather in March »
Weather in April
April is a refreshing spring month in Janesville, Iowa, with an average temperature varying between 39.7°F (4.3°C) and 56.1°F (13.4°C). As April arrives, Janesville's weather shows an increase in high-temperatures, moving from March's frosty 43°F (6.1°C) to a mild 56.1°F (13.4°C). Weather in April »
Weather in May
May, the last month of the spring in Janesville, is a refreshing month, with temperature in the range of an average low of 51.4°F (10.8°C) and an average high of 67.8°F (19.9°C). Janesville experiences a temperature shift with the start of May, with average high-temperatures moving from a moderate 56.1°F (13.4°C) in April to a comfortable 67.8°F (19.9°C). Weather in May »
Weather in June
June, the first month of the summer in Janesville, is a warm month, with temperature in the range of an average low of 60.8°F (16°C) and an average high of 77°F (25°C). June sees a temperature increase, moving from a comfortable 67.8°F (19.9°C) in May to a warm 77°F (25°C). Weather in June »
Weather in July
July, like June, in Janesville, Iowa, is another warm summer month, with an average temperature varying between 79.5°F (26.4°C) and 63°F (17.2°C). In Janesville, the average temperatures in July are the highest, with a peak at 79.5°F (26.4°C) and a low of 63°F (17.2°C). Weather in July »
Weather in August
August, the last month of the summer in Janesville, is also a moderately hot month, with an average temperature varying between 60.4°F (15.8°C) and 78.3°F (25.7°C). With August's arrival, Janesville's weather records an average high-temperature of a still moderately hot 78.3°F (25.7°C), marking little difference from July's 79.5°F (26.4°C). Weather in August »
Weather in September
September, the first month of the autumn in Janesville, is still a pleasant month, with an average temperature fluctuating between 72.9°F (22.7°C) and 54°F (12.2°C). The start of September signals a gentle decrease in the average high-temperature, transitioning from a warm 78.3°F (25.7°C) in August to an agreeable 72.9°F (22.7°C). Weather in September »
Weather in October
October, like September, is another mild autumn month in Janesville, Iowa, with temperature in the range of an average high of 58.1°F (14.5°C) and an average low of 43°F (6.1°C). October's arrival sees a clear drop in the average high-temperature, decreasing from September's agreeable 72.9°F (22.7°C) to a mild 58.1°F (14.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Janesville, Iowa, with an average temperature ranging between min 30.9°F (-0.6°C) and max 43.5°F (6.4°C). In November, the meteorological conditions markedly change with the average high-temperature descending from a refreshing 58.1°F (14.5°C) in October to a chilly 43.5°F (6.4°C). Weather in November »
Weather in December
December, the first month of the winter in Janesville, is still a freezing cold month, with an average temperature ranging between max 30.2°F (-1°C) and min 19.8°F (-6.8°C). The onset of December coincides with a reduction in the average high-temperature, falling from a chilly 43.5°F (6.4°C) in November to a subzero cold 30.2°F (-1°C). Weather in December »
[Resources]Frequently asked questions
What month is the coldest in Janesville?
January, on average, is the coldest month in Janesville, Iowa, registering a high temperature of 23.9°F (-4.5°C) and a low of 11.3°F (-11.5°C).
What is the most humid month in Janesville?
With an average relative humidity of 87%, January is the most humid month.
What is the driest month in Janesville?
The month with the least rainfall in Janesville is January, when the rain falls for 4.2 days and typically collects 1.02" (26mm) of precipitation.
How much does it rain in Janesville?
In Janesville, during the entire year, the rain falls for 138.7 days and collects up to 28.78" (731mm) of precipitation.
When does it snow in Janesville?
Months with snowfall are January through May, October through December.
How many days does it snow in Janesville?
In Janesville, during the entire year, snow falls for 43.6 days and aggregates up to 19.25" (489mm) of snow.
What is the month with the least sunshine in Janesville?
January has the least sunshine of the year, with an average of 3.8h of sunshine.
What is the month with the lowest UV index in Janesville?
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Janesville.
When does it snow the most in Janesville?
The month with the most snowfall is February, when snow falls for 10 days and typically aggregates up to 5.08" (129mm) of snow.
When is Daylight Saving Time (DST) in Janesville?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Janesville, 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 wettest month in Janesville?
June is the month with the most rainfall in Janesville, Iowa. Rain falls for 19.4 days and accumulates 4.29" (109mm) of precipitation.
When it does not snow in Janesville?
In Janesville, Iowa, snow does not fall in June through September.
When are the longest days in Janesville?
June has the longest days of the year in Janesville, Iowa, with an average of 15h and 18min of daylight.
When is the highest UV index in Janesville?
The month with the highest UV index in Janesville is June, with an average maximum UV index of 6.
What part of the year is the hottest in Janesville?
July temperatures in Janesville tend to peak at an average high of 79.5°F (26.4°C) and dip to a low of 63°F (17.2°C).
What month has the most sunshine in Janesville?
July has the most sunshine of the year in Janesville, with an average of 9.9h of sunshine.
What is the least humid month in Janesville?
The least humid month in Janesville is October, with an average relative humidity of 72%.
What is the month with the shortest days in Janesville?
With an average of 9h and 6min of daylight, December has the shortest days of the year.
Average temperature
Janesville, IA
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (23.9°F).
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (11.3°F).
Average pressure
Janesville, IA
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.13"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:
29.89"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30"Hg - Average pressure in November:
30.08"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 (29.89"Hg).
Average wind speed
Janesville, IA
- Average wind speed in January:
10.5mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10.4mph - Average wind speed in April:
10.7mph - Average wind speed in May:
9.2mph - Average wind speed in June:
8.1mph
- Average wind speed in July:
7.1mph - Average wind speed in August:
7mph - Average wind speed in September:
8.2mph - Average wind speed in October:
9.8mph - Average wind speed in November:
10.4mph - Average wind speed in December:
10mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity
Janesville, IA
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Janesville, IA
- Average rainfall in January:
1.02" - Average rainfall in February:
1.18" - Average rainfall in March:
1.69" - Average rainfall in April:
3.11" - Average rainfall in May:
4.17" - Average rainfall in June:
4.29"
- Average rainfall in July:
2.95" - Average rainfall in August:
2.36" - Average rainfall in September:
2.4" - Average rainfall in October:
2.68" - Average rainfall in November:
1.38" - Average rainfall in December:
1.54"
The wettest month (with the highest rainfall) is June (4.29").
The driest month (with the least rainfall) is January (1.02").
Average rainfall days
Janesville, IA
- Average rainfall days in January:
4.2 days - Average rainfall days in February:
3.9 days - Average rainfall days in March:
9.6 days - Average rainfall days in April:
14.7 days - Average rainfall days in May:
18.7 days - Average rainfall days in June:
19.4 days
- Average rainfall days in July:
16.3 days - Average rainfall days in August:
14.5 days - Average rainfall days in September:
12.8 days - Average rainfall days in October:
10.7 days - Average rainfall days in November:
8.2 days - Average rainfall days in December:
5.7 days
The month with the highest number of rainy days is June (19.4 days).
The month with the least rainy days is February (3.9 days).
Average snowfall
Janesville, IA
- Average snowfall in January:
4.33" - Average snowfall in February:
5.08" - Average snowfall in March:
2.36" - Average snowfall in April:
1.89" - Average snowfall in May:
0.2" - Average snowfall in June:
0"
The month with the highest snowfall is February (5.08").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Janesville, IA
- Average snowfall days in January:
10.5 days - Average snowfall days in February:
10 days - Average snowfall days in March:
6.3 days - Average snowfall days in April:
2.1 days - Average snowfall days in May:
0.2 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:
1.2 days - Average snowfall days in November:
3.8 days - Average snowfall days in December:
9.5 days
The month with the highest number of snowfall days is January (10.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Janesville, 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 2min
- 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 0min - 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 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in January:
3h and 5min - Average sunshine in February:
4h and 0min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 3min - Average sunshine in May:
8h and 3min - Average sunshine in June:
9h and 4min
- 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 1min - Average sunshine in December:
4h and 2min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days
Janesville, IA
- Average sunshine days in January:
17.2 days - Average sunshine days in February:
14.9 days - Average sunshine days in March:
15.4 days - Average sunshine days in April:
11.8 days - Average sunshine days in May:
10.3 days - Average sunshine days in June:
9.2 days
- Average sunshine days in July:
10.3 days - Average sunshine days in August:
13.1 days - Average sunshine days in September:
15.5 days - Average sunshine days in October:
17.8 days - Average sunshine days in November:
17.8 days - Average sunshine days in December:
17.6 days
The months with the most sunshine days are October and November (17.8 days).
The month with the least sunshine days is June (9.2 days).
Average UV index
Janesville, IA
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Janesville, IA
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility
Janesville, 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).
Janesville, Iowa, USA
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