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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
Climate and monthly weather forecast
Weather in January
January, the same as December, in Ontario, Wisconsin, is a freezing cold winter month, with an average temperature ranging between max 22.1°F (-5.5°C) and min 9.3°F (-12.6°C). The coldest period is January, when temperatures fluctuate between an average high of 22.1°F (-5.5°C) and a low of 9.3°F (-12.6°C). Weather in January »
Weather in February
The last month of the winter, February, is also a subzero cold month in Ontario, Wisconsin, with an average temperature ranging between min 13.1°F (-10.5°C) and max 26.1°F (-3.3°C). An average high-temperature of a still freezing cold 26.1°F (-3.3°C) marks February, exhibiting a close resemblance to the conditions in January. Weather in February »
Weather in March
The first month of the spring, March, is a wintry month in Ontario, Wisconsin, with an average temperature varying between 40.5°F (4.7°C) and 25.9°F (-3.4°C). The onset of March marks a clear increase in the average high-temperature, escalating from a subzero cold 26.1°F (-3.3°C) in February to an icy 40.5°F (4.7°C). Weather in March »
Weather in April
April in Ontario, Wisconsin, is a cool spring month, with an average temperature varying between 53.1°F (11.7°C) and 36°F (2.2°C). As Ontario enters April, the average high-temperature increases from the a cold 40.5°F (4.7°C) of March to a cool 53.1°F (11.7°C). Weather in April »
Weather in May
The last month of the spring, May, is a refreshing month in Ontario, Wisconsin, with an average temperature fluctuating between 47.5°F (8.6°C) and 65.8°F (18.8°C). Ontario's weather shows a temperature rise with the arrival of May, moving from a cool 53.1°F (11.7°C) in April to a comfortable 65.8°F (18.8°C). Weather in May »
Weather in June
June, the first month of the summer in Ontario, is a warm month, with an average temperature fluctuating between 75.6°F (24.2°C) and 56.5°F (13.6°C). June's onset witnesses a shift in the average high-temperature, moving from a comfortable 65.8°F (18.8°C) in May to a moderately hot 75.6°F (24.2°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Ontario, Wisconsin, with an average temperature fluctuating between 60.8°F (16°C) and 79.9°F (26.6°C). Ontario, Wisconsin, reaches its highest average temperatures in July, measuring 79.9°F (26.6°C) at the peak and 60.8°F (16°C) at the lowest. Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Ontario, Wisconsin, with an average temperature varying between 78.4°F (25.8°C) and 58.5°F (14.7°C). Ontario sees the arrival of August with an average high-temperature of a still moderately hot 78.4°F (25.8°C), indicating a subtle variation from July. Weather in August »
Weather in September
September, the first month of the autumn in Ontario, is also an agreeable month, with an average temperature fluctuating between 51.1°F (10.6°C) and 71.1°F (21.7°C). September is marked by a subtle drop in average high-temperatures, transitioning from a moderately hot 78.4°F (25.8°C) in August to an agreeable 71.1°F (21.7°C). Weather in September »
Weather in October
October, the same as September, in Ontario, Wisconsin, is another refreshing autumn month, with temperature in the range of an average high of 55.9°F (13.3°C) and an average low of 40.1°F (4.5°C). Ontario in October sees a clear temperature decline, with average high-temperatures decreasing from a pleasant 71.1°F (21.7°C) in September to a moderate 55.9°F (13.3°C). Weather in October »
Weather in November
The last month of the autumn, November, is also an icy month in Ontario, Wisconsin, with an average temperature varying between 28.6°F (-1.9°C) and 41.5°F (5.3°C). The beginning of November signals a clear reduction in the average high-temperature, falling from a refreshing 55.9°F (13.3°C) in October to a wintry 41.5°F (5.3°C). Weather in November »
Weather in December
The first month of the winter, December, is still a freezing cold month in Ontario, Wisconsin, with an average temperature fluctuating between 28°F (-2.2°C) and 17.6°F (-8°C). In December, the average high-temperature decreases from a cold 41.5°F (5.3°C) in November to a freezing cold 28°F (-2.2°C). Weather in December »
Updated: Aug 8, 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 part of the year is the coldest?
Ontario experiences its lowest temperatures in January, with an average peak of 22.1°F (-5.5°C) and a low of 9.3°F (-12.6°C).
What is the most humid month?
The most humid month is January, with an average relative humidity of 90%.
What is the driest month?
The month with the least rainfall is January, when the rain falls for 3.5 days and typically collects 1.1" (28mm) of precipitation.
How many days does it rain?
Throughout the year, there are 131.7 rainfall days, and 27.83" (707mm) 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, in Ontario, there are 50.2 snowfall days, and 21.69" (551mm) of snow is accumulated.
What is the month with the least sunshine?
January has the least sunshine of the year, with an average of 3h of sunshine.
What are the months with the lowest UV index?
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 1.
What is the snowiest month?
The month with the most snowfall is February, when snow falls for 10.5 days and typically aggregates up to 5.87" (149mm) 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 least humid month?
The least humid month is April, with an average relative humidity of 77%.
What is the rainiest month?
June is the month with the most rainfall. Rain falls for 16.9 days and accumulates 4.17" (106mm) of precipitation.
When it does not snow?
In Ontario, Wisconsin, snow does not fall in June through September.
When are the longest days?
June has the longest days of the year, with an average of 15h and 24min of daylight.
What is the hottest time of year?
Ontario, Wisconsin, experiences its average highest temperatures in July, reaching a peak of 79.9°F (26.6°C) and a minimum of 60.8°F (16°C).
What month has the most sunshine?
July has the most sunshine of the year in Ontario, with an average of 9.9h of sunshine.
When is the highest UV index?
The month with the highest UV index is July, with an average maximum UV index of 6.
What is the month with the shortest days?
With an average of 9h and 0min of daylight, December has the shortest days of the year.
Average temperature
Ontario, WI
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (22.1°F).
The month with the highest average low temperature is July (60.8°F).
The coldest month (with the lowest average low temperature) is January (9.3°F).
Average pressure
Ontario, WI
- Average pressure in January:
30.12"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.9"Hg
- Average pressure in July:
29.95"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
29.99"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
Ontario, WI
- Average wind speed in January:
9.1mph - Average wind speed in February:
8.9mph - Average wind speed in March:
8.8mph - Average wind speed in April:
9.3mph - Average wind speed in May:
8.1mph - Average wind speed in June:
7.2mph
- Average wind speed in July:
6.5mph - Average wind speed in August:
6.4mph - Average wind speed in September:
7.3mph - Average wind speed in October:
8.5mph - Average wind speed in November:
9mph - Average wind speed in December:
8.9mph
The windiest month (with the highest average wind speed) is April (9.3mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity
Ontario, WI
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is April (77%).
Average rainfall
Ontario, WI
- Average rainfall in January:
1.1" - Average rainfall in February:
1.22" - Average rainfall in March:
1.81" - Average rainfall in April:
2.83" - Average rainfall in May:
3.39" - Average rainfall in June:
4.17"
The wettest month (with the highest rainfall) is June (4.17").
The driest month (with the least rainfall) is January (1.1").
Average rainfall days
Ontario, WI
- Average rainfall days in January:
3.5 days - Average rainfall days in February:
4.3 days - Average rainfall days in March:
9.8 days - Average rainfall days in April:
14.3 days - Average rainfall days in May:
17.5 days - Average rainfall days in June:
16.9 days
- Average rainfall days in July:
15.6 days - Average rainfall days in August:
13 days - Average rainfall days in September:
12 days - Average rainfall days in October:
11.5 days - Average rainfall days in November:
7.7 days - Average rainfall days in December:
5.6 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (3.5 days).
Average snowfall
Ontario, WI
- Average snowfall in January:
4.88" - Average snowfall in February:
5.87" - Average snowfall in March:
2.68" - Average snowfall in April:
1.81" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is February (5.87").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Ontario, WI
- Average snowfall days in January:
12.3 days - Average snowfall days in February:
10.5 days - Average snowfall days in March:
6.8 days - Average snowfall days in April:
2.8 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:
1.6 days - Average snowfall days in November:
5.3 days - Average snowfall days in December:
10.6 days
The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Ontario, WI
- Average daylight in January:
9h and 2min - Average daylight in February:
10h and 3min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 3min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 2min
- Average daylight in July:
15h and 1min - 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 4min - Average daylight in December:
9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in January:
3h and 0min - Average sunshine in February:
3h and 2min - Average sunshine in March:
5h and 3min - Average sunshine in April:
7h and 1min - Average sunshine in May:
8h and 2min - Average sunshine in June:
9h and 1min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
9h and 4min - Average sunshine in September:
8h and 5min - Average sunshine in October:
5h and 0min - Average sunshine in November:
4h and 4min - Average sunshine in December:
3h and 3min
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 0min).
Average sunshine days
Ontario, WI
- Average sunshine days in January:
17 days - Average sunshine days in February:
14.9 days - Average sunshine days in March:
16.3 days - Average sunshine days in April:
12.5 days - Average sunshine days in May:
11.9 days - Average sunshine days in June:
10.4 days
- Average sunshine days in July:
11.9 days - Average sunshine days in August:
15.7 days - Average sunshine days in September:
16.3 days - Average sunshine days in October:
17 days - Average sunshine days in November:
17.3 days - Average sunshine days in December:
17.5 days
The month with the most sunshine days is December (17.5 days).
The month with the least sunshine days is June (10.4 days).
Average UV index
Ontario, WI
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover
Ontario, WI
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility
Ontario, WI
The months with the highest visibility are April, May, June, October and November (6mi).
The month with the lowest visibility is January (4mi).