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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, like December, is a frosty winter month in Tri-City, Oregon, with an average temperature varying between 47.8°F (8.8°C) and 33.4°F (0.8°C). The average high-temperature for January is a still frosty 47.8°F (8.8°C), closely aligning with the temperature of the preceding month. Weather in January »
Weather in February
The last month of the winter, February, is another chilly month in Tri-City, Oregon, with an average temperature fluctuating between 49.1°F (9.5°C) and 32.9°F (0.5°C). January's transformation into February witnesses an average high-temperature of a still frosty 49.1°F (9.5°C), noting a minor change from the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is a cool month in Tri-City, Oregon, with temperature in the range of an average high of 52.7°F (11.5°C) and an average low of 34°F (1.1°C). In March, Tri-City experiences a minor shift in meteorological conditions with average high-temperatures marked at a cool 52.7°F (11.5°C), closely mirroring the climate in February. Weather in March »
Weather in April
April in Tri-City, Oregon, is a refreshing spring month, with an average temperature varying between 35.4°F (1.9°C) and 57.4°F (14.1°C). Tri-City's transition from March to April introduces an average high-temperature of a moderate 57.4°F (14.1°C), marking an insignificant variation from the 52.7°F (11.5°C). Weather in April »
Weather in May
May, the last month of the spring in Tri-City, is a comfortable month, with an average temperature varying between 64.9°F (18.3°C) and 39°F (3.9°C). As May sets, the average high-temperature shows a slight increase, moving up from a moderate 57.4°F (14.1°C) in April to an enjoyable 64.9°F (18.3°C). Weather in May »
Weather in June
The first month of the summer, June, is a pleasant month in Tri-City, Oregon, with an average temperature ranging between max 71.2°F (21.8°C) and min 43°F (6.1°C). As Tri-City enters June, the average high-temperature marginally increases from the a comfortable 64.9°F (18.3°C) of May to an agreeable 71.2°F (21.8°C). Weather in June »
Weather in July
July is a moderately hot summer month in Tri-City, Oregon, with an average temperature fluctuating between 47.1°F (8.4°C) and 79.9°F (26.6°C). The start of July is characterized by a subtle increase in the average high-temperature, transitioning from a pleasant 71.2°F (21.8°C) in June to a moderately hot 79.9°F (26.6°C). Weather in July »
Weather in August
August, the last month of the summer in Tri-City, is also a moderately hot month, with an average temperature varying between 81.1°F (27.3°C) and 47.7°F (8.7°C). Tri-City registers the highest average temperatures during the month of August, with peaks of 81.1°F (27.3°C) and lows of 47.7°F (8.7°C). For August, the heat index is evaluated at 84.2°F (29°C). Weather in August »
Weather in September
September, the first month of the autumn in Tri-City, is also a moderately hot month, with temperature in the range of an average high of 74.5°F (23.6°C) and an average low of 44.8°F (7.1°C). Transition into September subtly marks a drop in the average high-temperature, moderately moving from 81.1°F (27.3°C) in August to a still warm 74.5°F (23.6°C). Weather in September »
Weather in October
October, like September, in Tri-City, Oregon, is another enjoyable autumn month, with an average temperature fluctuating between 63.5°F (17.5°C) and 40.8°F (4.9°C). As October commences, the average high-temperature shows a reduction, transitioning from a warm 74.5°F (23.6°C) in September to a refreshing 63.5°F (17.5°C). Weather in October »
Weather in November
November, the last month of the autumn in Tri-City, is another cool month, with an average temperature fluctuating between 36.5°F (2.5°C) and 52.7°F (11.5°C). In Tri-City, entering November brings a temperature decrement, reducing from October's enjoyable 63.5°F (17.5°C) to a fresh 52.7°F (11.5°C). Weather in November »
Weather in December
December, the first month of the winter in Tri-City, is also a frosty month, with an average temperature varying between 32.2°F (0.1°C) and 45.7°F (7.6°C). The month of December, characterized by an average high of 45.7°F (7.6°C) and a low of 32.2°F (0.1°C), is recognized as the coldest. Weather in December »
Updated: Aug 10, 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 is the most humid month?
January, February and December, with an average relative humidity of 86%, are most humid months.
What is the wettest month?
The wettest months are January, February and December, with an average 1.1" (28mm) of rainfall.
How many days does it rain?
In Tri-City, during the entire year, the rain falls for 93.9 days and collects up to 7.64" (194mm) of precipitation.
When does it snow?
January through March, November and December are months with snowfall.
How much does it snow in Tri-City?
Throughout the year, there are 3.5 snowfall days, and 2.2" (56mm) of snow is accumulated.
What is the month with the lowest UV index?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
What is the snowiest month?
February is the month with the most snowfall in Tri-City. Snow falls for 1.5 days and accumulates 0.87" (22mm) 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 PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
When it does not snow?
April through October are months without snowfall.
When are the longest days?
June has the longest days of the year, with an average of 15h and 18min of daylight.
What is the driest month?
The months with the least rainfall are July and August Rain falls for 3.8 days and accumulates 0.16" (4mm) of rain.
When is the highest UV index?
The month with the highest UV index is July, with an average maximum UV index of 6.
What time of the year is the hottest?
Tri-City's warmest month, August, generally records average temperatures ranging from a high of 81.1°F (27.3°C) to a low of 47.7°F (8.7°C).
What is the least humid month?
With an average relative humidity of 69%, August is the least humid month.
What month has the most sunshine?
The month with the most sunshine is August, with an average of 11.3h of sunshine.
What is the coldest month?
In Tri-City, December registers the lowest temperatures, averaging 45.7°F (7.6°C) at the peak and 32.2°F (0.1°C) at the lowest.
What is the month with the shortest days in Tri-City?
With an average of 9h and 6min of daylight, December has the shortest days of the year.
What is the month with the least sunshine?
With an average of 4.3h of sunshine, December has the least sunshine of the year.
Average temperature
Tri-City, OR
The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (45.7°F).
The month with the highest average low temperature is August (47.7°F).
The coldest month (with the lowest average low temperature) is December (32.2°F).
Average pressure
Tri-City, OR
- Average pressure in January:
30.12"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.05"Hg - Average pressure in April:
30.08"Hg - Average pressure in May:
30.03"Hg - Average pressure in June:
30.03"Hg
- Average pressure in July:
30.02"Hg - Average pressure in August:
30"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
30.05"Hg - Average pressure in November:
30.08"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed
Tri-City, OR
- Average wind speed in January:
4.1mph - Average wind speed in February:
3.8mph - Average wind speed in March:
4mph - Average wind speed in April:
3.8mph - Average wind speed in May:
3.7mph - Average wind speed in June:
3.7mph
- Average wind speed in July:
3.7mph - Average wind speed in August:
3.3mph - Average wind speed in September:
3.2mph - Average wind speed in October:
3.3mph - Average wind speed in November:
3.7mph - Average wind speed in December:
3.9mph
The windiest month (with the highest average wind speed) is January (4.1mph).
The calmest month (with the lowest average wind speed) is September (3.2mph).
Average humidity
Tri-City, OR
The months with the highest relative humidity are January, February and December (86%).
The month with the lowest relative humidity is August (69%).
Average rainfall
Tri-City, OR
- Average rainfall in January:
1.1" - Average rainfall in February:
1.1" - Average rainfall in March:
0.91" - Average rainfall in April:
0.71" - Average rainfall in May:
0.59" - Average rainfall in June:
0.35"
- Average rainfall in July:
0.16" - Average rainfall in August:
0.16" - Average rainfall in September:
0.31" - Average rainfall in October:
0.39" - Average rainfall in November:
0.75" - Average rainfall in December:
1.1"
The wettest months (with the highest rainfall) are January, February and December (1.1").
The driest months (with the least rainfall) are July and August (0.16").
Average rainfall days
Tri-City, OR
- Average rainfall days in January:
10.8 days - Average rainfall days in February:
10.2 days - Average rainfall days in March:
12.6 days - Average rainfall days in April:
10.6 days - Average rainfall days in May:
8 days - Average rainfall days in June:
6.3 days
- Average rainfall days in July:
3.8 days - Average rainfall days in August:
2.4 days - Average rainfall days in September:
3.6 days - Average rainfall days in October:
6.1 days - Average rainfall days in November:
8.1 days - Average rainfall days in December:
11.4 days
The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is August (2.4 days).
Average snowfall
Tri-City, OR
The month with the highest snowfall is February (0.87").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Tri-City, OR
- Average snowfall days in January:
0.5 days - Average snowfall days in February:
1.5 days - Average snowfall days in March:
0.6 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 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:
0 days - Average snowfall days in November:
0.4 days - Average snowfall days in December:
0.5 days
The month with the highest number of snowfall days is February (1.5 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Tri-City, OR
- Average daylight in January:
9h and 2min - 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:
15h and 0min - 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 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:
4h and 4min - Average sunshine in February:
4h and 3min - Average sunshine in March:
5h and 4min - Average sunshine in April:
7h and 1min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 4min
- Average sunshine in July:
11h and 1min - Average sunshine in August:
11h and 2min - Average sunshine in September:
9h and 4min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 2min
The month with the most sunshine is August (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).
Average sunshine days
Tri-City, OR
- Average sunshine days in January:
18.7 days - Average sunshine days in February:
16.3 days - Average sunshine days in March:
16.1 days - Average sunshine days in April:
17.2 days - Average sunshine days in May:
20.6 days - Average sunshine days in June:
21.8 days
- Average sunshine days in July:
25.8 days - Average sunshine days in August:
26.5 days - Average sunshine days in September:
25.9 days - Average sunshine days in October:
23.2 days - Average sunshine days in November:
19.7 days - Average sunshine days in December:
17.7 days
The month with the most sunshine days is August (26.5 days).
The month with the least sunshine days is March (16.1 days).
Average UV index
Tri-City, OR
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 2).
Average cloud cover
Tri-City, OR
The month with the most cloud cover is March (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility
Tri-City, OR
The months with the highest visibility are July, August and September (5mi).
The months with the lowest visibility are January, February, March, April, May, June, October, November and December (4mi).
Tri-City, Oregon, USA
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