Ontario
Oregon, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Ontario, OR

January, like December, in Ontario, Oregon, is another cold winter month, with average temperature ranging between min 18°F (-7.8°C) and max 34°F (1.1°C). With an average high-temperature of 34°F (1.1°C) and an average low-temperature of 18°F (-7.8°C), January is the coldest month. Weather in January »
February, the last month of the winter, in Ontario, is a frosty month, with average temperature varying between 24.1°F (-4.4°C) and 43°F (6.1°C). In Ontario, Oregon, the average high-temperature rises, from a wintry 34°F (1.1°C) in January, to a frosty 43°F (6.1°C). Weather in February »

March, the first month of the spring, in Ontario, is a cool month, with average temperature varying between 30.9°F (-0.6°C) and 55°F (12.8°C). In Ontario, the average high-temperature in March rises, from a chilly 43°F (6.1°C) in February, to a fresh 55°F (12.8°C). Weather in March »

April is an enjoyable spring month in Ontario, Oregon, with average temperature varying between 64.9°F (18.3°C) and 37°F (2.8°C). In April, the average high-temperature increases, from a cool 55°F (12.8°C) in March, to an enjoyable 64.9°F (18.3°C). Weather in April »

The last month of the spring, May, is a warm month in Ontario, Oregon, with average temperature varying between 73.9°F (23.3°C) and 45°F (7.2°C). In Ontario, the average high-temperature increases, from a comfortable 64.9°F (18.3°C) in April, to a moderately hot 73.9°F (23.3°C). Weather in May »

June, the first month of the summer, in Ontario, is also a moderately hot month, with average temperature ranging between max 84°F (28.9°C) and min 51.1°F (10.6°C). In June, the average high-temperature increases, from a moderately hot 73.9°F (23.3°C) in May, to a still warm 84°F (28.9°C). Weather in June »

July is a hot summer month in Ontario, Oregon, with average temperature varying between 57°F (13.9°C) and 93°F (33.9°C). With an average high-temperature of 93°F (33.9°C) and an average low-temperature of 57°F (13.9°C), July is the warmest month. Weather in July »

The last month of the summer, August, is also a hot month in Ontario, Oregon, with average temperature ranging between max 91°F (32.8°C) and min 54°F (12.2°C). In August, the average high-temperature is essentially the same as in July - a still hot 91°F (32.8°C). Weather in August »

September, the first month of the autumn, in Ontario, is still a warm month, with average temperature varying between 81°F (27.2°C) and 45°F (7.2°C). In Ontario, the average high-temperature decreases, from a hot 91°F (32.8°C) in August, to a warm 81°F (27.2°C). Weather in September »

October, the same as September, is another enjoyable autumn month in Ontario, Oregon, with average temperature fluctuating between 34°F (1.1°C) and 66°F (18.9°C). In Ontario, Oregon, the average high-temperature plummets, from a warm 81°F (27.2°C) in September, to an enjoyable 66°F (18.9°C). Weather in October »

The last month of the autumn, November, is another chilly month in Ontario, Oregon, with average temperature ranging between max 46.9°F (8.3°C) and min 27°F (-2.8°C). In Ontario, the average high-temperature in November significantly decreases, from an enjoyable 66°F (18.9°C) in October, to a chilly 46.9°F (8.3°C). Weather in November »

The first month of the winter, December, is also a wintry month in Ontario, Oregon, with temperature in the range of an average high of 36°F (2.2°C) and an average low of 19.9°F (-6.7°C). In December, the average high-temperature drops, from a chilly 46.9°F (8.3°C) in November, to a cold 36°F (2.2°C). Weather in December »

What is the coldest month in Ontario?

The coldest month is January, with an average high-temperature of 34°F (1.1°C) and an average low-temperature of 18°F (-7.8°C).

How much does it rain in Ontario?

During the entire year, Ontario aggregates up to 9.4" (239.9mm) of precipitation.

When does it snow in Ontario?

January through March, November and December are months with snowfall in Ontario.

How much does it snow in Ontario?

In Ontario, Oregon, during the entire year, snow aggregates up to 10.2" (259.1mm).

When are the longest days in Ontario?

With an average of 15.4h of daylight, June has the longest days of the year in Ontario, Oregon.

What is the warmest month in Ontario?

July is the warmest month in Ontario, with an average high-temperature of 93°F (33.9°C) and an average low-temperature of 57°F (13.9°C).

What is the driest month in Ontario?

The month with the least rainfall in Ontario, Oregon, is August when 0.3" (7.1mm) of precipitation is typically aggregated.

What is the rainiest month in Ontario?

The month with the most rainfall in Ontario is December when 1.4" (35.8mm) of precipitation is typically aggregated.

When does it snow the most in Ontario?

December is the month with the most snowfall in Ontario, with 5" (127mm) of accumulated snow.

What is the month with the shortest days in Ontario?

With an average of 8.9h of daylight, December has the shortest days of the year.
Average rainfall - Ontario, OR
Average snowfall - Ontario, OR
Average daylight - Ontario, OR

The month with the longest days is June (Average daylight: 15.4h).
The month with shortest days is December (Average daylight: 8.9h).