Climate and monthly weather forecast
Ontario, WI

Weather in January

January, the same as December, in Ontario, Wisconsin, is a freezing cold winter month, with temperature in the range of an average high of 22.1°F (-5.5°C) and an average low of 9.3°F (-12.6°C). The coldest month is January, with an average high-temperature of 22.1°F (-5.5°C) and an average low-temperature 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 fluctuating between 26.1°F (-3.3°C) and 13.1°F (-10.5°C). In February, the average high-temperature is practically the same as in January - a still freezing cold 26.1°F (-3.3°C). 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 25.9°F (-3.4°C) and 40.5°F (4.7°C). In March, the average high-temperature soars, from a subzero cold 26.1°F (-3.3°C) in February, to a cold 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 fluctuating between 53.1°F (11.7°C) and 36°F (2.2°C). In April, the average high-temperature increases from a cold 40.5°F (4.7°C) in March to a cool 53.1°F (11.7°C). Weather in April »

Weather in May

May, the last month of the spring in Ontario, is an enjoyable month, with an average temperature fluctuating between 47.5°F (8.6°C) and 65.8°F (18.8°C). In Ontario, the average high-temperature in May increases from a fresh 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 moderately hot month, with temperature in the range of an average low of 56.5°F (13.6°C) and an average high of 75.6°F (24.2°C). In June, the average high-temperature increases from a comfortable 65.8°F (18.8°C) in May to a warm 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 temperature in the range of an average low of 60.8°F (16°C) and an average high of 79.9°F (26.6°C). The warmest month is July, with an average high-temperature of 79.9°F (26.6°C) and an average low-temperature of 60.8°F (16°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Ontario, Wisconsin, with temperature in the range of an average low of 58.5°F (14.7°C) and an average high of 78.4°F (25.8°C). In August, the average high-temperature is essentially the same as in July - a still moderately hot 78.4°F (25.8°C). Weather in August »

Weather in September

The first month of the autumn, September, is also an agreeable month in Ontario, Wisconsin, with an average temperature ranging between min 51.1°F (10.6°C) and max 71.1°F (21.7°C). In September, the average high-temperature slightly decreases from a warm 78.4°F (25.8°C) in August to a pleasant 71.1°F (21.7°C). Weather in September »

Weather in October

October, the same as September, in Ontario, Wisconsin, is a moderate autumn month, with an average temperature fluctuating between 40.1°F (4.5°C) and 55.9°F (13.3°C). In Ontario, the average high-temperature in October declines considerably from an agreeable 71.1°F (21.7°C) in September to a mild 55.9°F (13.3°C). Weather in October »

Weather in November

November, the last month of the autumn in Ontario, is also a wintry month, with an average temperature ranging between max 41.5°F (5.3°C) and min 28.6°F (-1.9°C). In Ontario, the average high-temperature in November plummets from a mild 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 also a subzero cold month in Ontario, Wisconsin, with temperature in the range of an average high of 28°F (-2.2°C) and an average low of 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 »
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FAQ

What is the coldest month in Ontario?

With an average high-temperature of 22.1°F (-5.5°C) and an average low-temperature of 9.3°F (-12.6°C), January is the coldest month in Ontario, Wisconsin.

What is the most humid month in Ontario?

January is the most humid month in Ontario, with an average relative humidity of 90%.

What is the driest month in Ontario?

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 much does it rain in Ontario?

Throughout the year, in Ontario, Wisconsin, there are 131.7 rainfall days, and 27.83" (707mm) of precipitation is accumulated.

When does it snow in Ontario?

Months with snowfall are January through May, October through December.

How many days does it snow in Ontario?

In Ontario, Wisconsin, during the entire year, snow falls for 50.2 days and aggregates up to 21.69" (551mm) of snow.

What is the month with the least sunshine in Ontario?

The month with the least sunshine is January, with an average of 3h of sunshine.

When is the lowest UV index in Ontario?

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Ontario.

When does it snow the most in Ontario?

The month with the most snowfall in Ontario, Wisconsin, 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) in Ontario?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from CDT to CST.

What is the least humid month in Ontario?

With an average relative humidity of 77%, April is the least humid month in Ontario, Wisconsin.

What is the rainiest month in Ontario?

The month with the most rainfall in Ontario, Wisconsin, is June, when the rain falls for 16.9 days and typically aggregates up to 4.17" (106mm) of precipitation.

When it does not snow in Ontario?

In Ontario, Wisconsin, snow does not fall in June through September.

When are the longest days in Ontario?

June has the longest days of the year, with an average of 15h and 24min of daylight.

What is the warmest month in Ontario?

With an average high-temperature of 79.9°F (26.6°C) and an average low-temperature of 60.8°F (16°C), July is the warmest month in Ontario.

What month has the most sunshine in Ontario?

The month with the most sunshine in Ontario is July, with an average of 9.9h of sunshine.

What is the month with the highest UV index in Ontario?

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 in Ontario?

December has the shortest days of the year, with an average of 8h and 59min of daylight.

Average temperature
Ontario, WI

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).

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Average pressure
Ontario, WI

Average pressure - Ontario, WI

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed
Ontario, WI

Average wind speed - Ontario, WI

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).

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Average rainfall
Ontario, WI

Average rainfall - Ontario, WI

The wettest month (with the highest rainfall) is June (4.17").
The driest month (with the least rainfall) is January (1.1").

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Average rainfall days
Ontario, WI

Average rainfall days - Ontario, WI

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).

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Average snowfall
Ontario, WI

Average snowfall - Ontario, WI

The month with the highest snowfall is February (5.87").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Ontario, WI

Average snowfall days - Ontario, WI

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).

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Average daylight / Average sunshine
Ontario, WI

Average daylight / Average sunshine - Ontario, WI

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 8h and 59min).

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).

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Average sunshine days
Ontario, WI

Average sunshine days - Ontario, WI

The month with the most sunshine days is December (17.5 days).
The month with the least sunshine days is June (10.4 days).

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Average UV index
Ontario, WI

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).

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Average visibility
Ontario, WI

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).

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