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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, the same as December, in Tri-City, Oregon, is another chilly winter month, with an average temperature varying between 47.8°F (8.8°C) and 33.4°F (0.8°C). January registers an average high-temperature of a still chilly 47.8°F (8.8°C), slightly varied from December's 45.7°F (7.6°C). 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). February's average high-temperature is a still frosty 49.1°F (9.5°C), maintaining a close comparison with January's 47.8°F (8.8°C). Weather in February »
Weather in March
The first month of the spring, March, is a fresh month in Tri-City, Oregon, with an average temperature ranging between max 52.7°F (11.5°C) and min 34°F (1.1°C). Tri-City's average high-temperature in March sits at a cool 52.7°F (11.5°C), showing little difference from the previous month. Weather in March »
Weather in April
April in Tri-City, Oregon, is a refreshing spring month, with an average temperature fluctuating between 57.4°F (14.1°C) and 35.4°F (1.9°C). Tri-City starts April with an average high-temperature of a moderate 57.4°F (14.1°C), a minor shift from March's 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 ranging between min 39°F (3.9°C) and max 64.9°F (18.3°C). The beginning of May signals a minor rise in the average high-temperature, moving from a moderate 57.4°F (14.1°C) in April to a comfortable 64.9°F (18.3°C). Weather in May »
Weather in June
The first month of the summer, June, is an agreeable month in Tri-City, Oregon, with temperature in the range of an average low of 43°F (6.1°C) and an average high of 71.2°F (21.8°C). The transition from May to June brings a subtle temperature rise, with average high-temperatures increasing from a refreshing 64.9°F (18.3°C) to an agreeable 71.2°F (21.8°C). Weather in June »
Weather in July
July in Tri-City, Oregon, is a warm summer month, with an average temperature fluctuating between 79.9°F (26.6°C) and 47.1°F (8.4°C). July's arrival sees a mild rise in the average high-temperature, transitioning from June's pleasant 71.2°F (21.8°C) to a moderately hot 79.9°F (26.6°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Tri-City, Oregon, with an average temperature fluctuating between 47.7°F (8.7°C) and 81.1°F (27.3°C). August, with its average high-temperature of 81.1°F (27.3°C) and an average low-temperature of 47.7°F (8.7°C), holds the record as the warmest month. For most parts of 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 an average temperature varying between 74.5°F (23.6°C) and 44.8°F (7.1°C). The commencement of September includes a gentle temperature shift, with the average high-temperature dropping a bit 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, the same as September, is another refreshing autumn month in Tri-City, Oregon, with temperature in the range of an average high of 63.5°F (17.5°C) and an average low of 40.8°F (4.9°C). October brings a decrease in the average high-temperature, shifting from a warm 74.5°F (23.6°C) in September to a comfortable 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 varying between 36.5°F (2.5°C) and 52.7°F (11.5°C). November suggests a modest reduction in the average high-temperature, shifting from a refreshing 63.5°F (17.5°C) in October to a cool 52.7°F (11.5°C). Weather in November »
Weather in December
December, the first month of the winter in Tri-City, is still a chilly month, with an average temperature ranging between max 45.7°F (7.6°C) and min 32.2°F (0.1°C). December, having an average high-temperature of 45.7°F (7.6°C) and an average low-temperature of 32.2°F (0.1°C), is the coldest month. Weather in December »
[Resources]Frequently asked questions
What are the most humid months in Tri-City?
The months with the highest humidity in Tri-City are January, February and December, with an average relative humidity of 86%.
What is the wettest month in Tri-City?
The months with the most rainfall are January, February and December, with an average 1.1" (28mm) of precipitation.
How many days does it rain in Tri-City?
Throughout the year, in Tri-City, Oregon, there are 93.9 rainfall days, and 7.64" (194mm) of precipitation is accumulated.
When does it snow in Tri-City?
Months with snowfall in Tri-City, Oregon, are January through March, November and December.
How many days does it snow in Tri-City?
In Tri-City, during the entire year, snow falls for 3.5 days and aggregates up to 2.2" (56mm) of snow.
When is the lowest UV index in Tri-City?
The months with the lowest UV index in Tri-City are January, February, November and December, with an average maximum UV index of 2.
What is the snowiest month in Tri-City?
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) in Tri-City?
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 in Tri-City?
In Tri-City, snow does not fall in April through October.
When are the longest days in Tri-City?
With an average of 15h and 18min of daylight, June has the longest days of the year.
What is the driest month in Tri-City?
July and August are months with the least rain when the rain falls for 3.8 days and typically aggregates up to 0.16" (4mm) of rain.
What is the month with the highest UV index in Tri-City?
With an average maximum UV index of 6, July is the month with the highest UV index in Tri-City, Oregon.
What part of the year is the hottest in Tri-City?
August is the warmest month in Tri-City, with the temperature often reaching an average high of 81.1°F (27.3°C) and an average low of 47.7°F (8.7°C).
What is the least humid month in Tri-City?
The least humid month is August, with an average relative humidity of 69%.
What month has the most sunshine in Tri-City?
With an average of 11.3h of sunshine, August has the most sunshine of the year in Tri-City, Oregon.
What part of the year is the coldest in Tri-City?
December is the coldest month of the year in Tri-City, Oregon, registering average temperatures as high as 45.7°F (7.6°C) and as low as 32.2°F (0.1°C).
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 in Tri-City?
With an average of 4.3h of sunshine, December has the least sunshine of the year in Tri-City.
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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