Climate and monthly weather forecast
Ontario, OR

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Weather in January

January, like December, in Ontario, Oregon, is an icy winter month, with temperature in the range of an average low of 23.5°F (-4.7°C) and an average high of 36.1°F (2.3°C). Ontario witnesses its lowest temperatures in January and December, reaching an average of 36.1°F (2.3°C). Weather in January »

Weather in February

The last month of the winter, February, is also an icy month in Ontario, Oregon, with temperature in the range of an average low of 29.1°F (-1.6°C) and an average high of 42.4°F (5.8°C). The beginning of February signals a minor rise in the average high-temperature, moving from 36.1°F (2.3°C) in January to a still icy 42.4°F (5.8°C). Weather in February »

Weather in March

The first month of the spring, March, is a cool month in Ontario, Oregon, with an average temperature fluctuating between 53.2°F (11.8°C) and 36.9°F (2.7°C). The beginning of March signals a rise in the average high-temperature, moving from a wintry 42.4°F (5.8°C) in February to a fresh 53.2°F (11.8°C). Weather in March »

Weather in April

April is a refreshing spring month in Ontario, Oregon, with an average temperature fluctuating between 40.3°F (4.6°C) and 62.2°F (16.8°C). A rise in the average high-temperature is observed during April, moving from a cool 53.2°F (11.8°C) in March to a comfortable 62.2°F (16.8°C). Weather in April »

Weather in May

May, the last month of the spring in Ontario, is an agreeable month, with an average temperature varying between 46.9°F (8.3°C) and 72.1°F (22.3°C). Ontario's weather in May shows a rise in the average high-temperature, moving up from April's refreshing 62.2°F (16.8°C) to a pleasant 72.1°F (22.3°C). Weather in May »

Weather in June

The first month of the summer, June, is a moderately hot month in Ontario, Oregon, with an average temperature fluctuating between 81°F (27.2°C) and 54.1°F (12.3°C). June signifies a subtle uplift in the average high-temperature, adjusting from a pleasant 72.1°F (22.3°C) in May to a warm 81°F (27.2°C). Weather in June »

Weather in July

July is a tropical summer month in Ontario, Oregon, with an average temperature varying between 62.2°F (16.8°C) and 93.2°F (34°C). The warmest month is July, with an average high-temperature of 93.2°F (34°C) and an average low-temperature of 62.2°F (16.8°C). Weather in July »

Weather in August

The last month of the summer, August, is also a hot month in Ontario, Oregon, with temperature in the range of an average low of 62.1°F (16.7°C) and an average high of 91.9°F (33.3°C). Ontario commences August with an average high-temperature of a still hot 91.9°F (33.3°C), maintaining a close resemblance to the previous month. Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Ontario, Oregon, with an average temperature fluctuating between 55.2°F (12.9°C) and 80.6°F (27°C). September's onset corresponds with a shift in the average high-temperature, moving from a tropical 91.9°F (33.3°C) in August to a moderately hot 80.6°F (27°C). Weather in September »

Weather in October

October, the same as September, is another enjoyable autumn month in Ontario, Oregon, with an average temperature varying between 43.7°F (6.5°C) and 62.6°F (17°C). The shift into October is characterized by a noticeable reduction in the average high-temperature, decreasing from September's warm 80.6°F (27°C) to an enjoyable 62.6°F (17°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a frosty month in Ontario, Oregon, with an average temperature varying between 48.2°F (9°C) and 32.7°F (0.4°C). The transition from October to November brings a clear temperature drop, with average high-temperatures decreasing from a refreshing 62.6°F (17°C) to a chilly 48.2°F (9°C). Weather in November »

Weather in December

December, the first month of the winter in Ontario, is also a wintry month, with an average temperature varying between 23°F (-5°C) and 36.1°F (2.3°C). In Ontario, the coldest months are January and December, registering an average high-temperature of 36.1°F (2.3°C). Weather in December »
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Frequently asked questions

What time of the year is the coldest in Ontario?

Ontario experiences its coldest period in January and December, averaging a high-temperature of 36.1°F (2.3°C).

What is the most humid month in Ontario?

The most humid month in Ontario, Oregon, is January, with an average relative humidity of 82%.

How many days does it rain in Ontario?

In Ontario, Oregon, during the entire year, the rain falls for 84.9 days and collects up to 9.29" (236mm) of precipitation.

When does it snow in Ontario?

January through April, November and December are months with snowfall.

How much does it snow in Ontario?

In Ontario, during the entire year, snow falls for 21.8 days and aggregates up to 12.56" (319mm) of snow.

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

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

When is Daylight Saving Time (DST) in Ontario?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Ontario, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from MDT to MST.

When it does not snow in Ontario?

May through October are months without snowfall.

When are the longest days in Ontario?

The month with the longest days is June, with an average of 15h and 24min of daylight.

What is the hottest time of year in Ontario?

Temperature records in Ontario, Oregon, mark July as the warmest month, with highs averaging 93.2°F (34°C) and lows at 62.2°F (16.8°C).

What is the driest month in Ontario?

The month with the least rainfall in Ontario is July, when the rain falls for 2.5 days and typically collects 0.08" (2mm) of precipitation.

What month has the most sunshine in Ontario?

With an average of 12.1h of sunshine, July has the most sunshine of the year in Ontario.

When is the highest UV index in Ontario?

July is the month with the highest UV index in Ontario, Oregon, with an average maximum UV index of 7.

What is the least humid month in Ontario?

August is the least humid month in Ontario, with an average relative humidity of 29%.

What is the wettest month in Ontario?

The month with the most rainfall is December, when the rain falls for 8.9 days and typically aggregates up to 1.57" (40mm) of precipitation.

When does it snow the most in Ontario?

December is the month with the most snowfall in Ontario, Oregon. Snow falls for 7.4 days and accumulates 5.35" (136mm) of snow.

What is the month with the shortest days in Ontario?

December has the shortest days of the year, with an average of 9h and 0min of daylight.

What is the month with the least sunshine in Ontario?

With an average of 5.1h of sunshine, December has the least sunshine of the year.

Average temperature
Ontario, OR

Average temperature - Ontario, OR

The warmest month (with the highest average high temperature) is July (93.2°F).
The months with the lowest average high temperature are January and December (36.1°F).

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is December (23°F).

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Average pressure
Ontario, OR

Average pressure - Ontario, OR

The month with the highest atmospheric pressure is January (30.24"Hg).
The months with the lowest atmospheric pressure are June and August (29.92"Hg).

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Average wind speed
Ontario, OR

Average wind speed - Ontario, OR

The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest month (with the lowest average wind speed) is January (3.9mph).

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Average rainfall
Ontario, OR

Average rainfall - Ontario, OR

The wettest month (with the highest rainfall) is December (1.57").
The driest month (with the least rainfall) is July (0.08").

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Average rainfall days
Ontario, OR

Average rainfall days - Ontario, OR

The month with the highest number of rainy days is March (13.3 days).
The month with the least rainy days is August (1.8 days).

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Average snowfall
Ontario, OR

Average snowfall - Ontario, OR

The month with the highest snowfall is December (5.35").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days
Ontario, OR

Average snowfall days - Ontario, OR

The month with the highest number of snowfall days is December (7.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight / Average sunshine
Ontario, OR

Average daylight / Average sunshine - Ontario, OR

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).

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).

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Average sunshine days
Ontario, OR

Average sunshine days - Ontario, OR

The month with the most sunshine days is July (27.7 days).
The month with the least sunshine days is February (15.2 days).

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Average UV index
Ontario, OR

Average UV index - Ontario, OR

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average visibility
Ontario, OR

Average visibility - Ontario, OR

The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).

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Ontario, Oregon, USA

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