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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, in Mattawa, Washington, is a wintry winter month, with an average temperature ranging between min 25.9°F (-3.4°C) and max 35.4°F (1.9°C). At the start of January, Mattawa's average high-temperature reaches a still cold 35.4°F (1.9°C), subtly different from the preceding month. Weather in January »
Weather in February
February, the last month of the winter in Mattawa, is also an icy month, with an average temperature ranging between min 29.1°F (-1.6°C) and max 41.4°F (5.2°C). February brings a slight rise in Mattawa's average high-temperature, moving from an icy 35.4°F (1.9°C) in January to a still cold 41.4°F (5.2°C). Weather in February »
Weather in March
The first month of the spring, March, is a fresh month in Mattawa, Washington, with an average temperature fluctuating between 35.8°F (2.1°C) and 51.4°F (10.8°C). March's onset brings a rise in the average high-temperature, moving from an icy 41.4°F (5.2°C) in February to a fresh 51.4°F (10.8°C). Weather in March »
Weather in April
April is an enjoyable spring month in Mattawa, Washington, with temperature in the range of an average high of 61.3°F (16.3°C) and an average low of 41.5°F (5.3°C). April's arrival coincides with a rise in the average high-temperature, moving from March's cool 51.4°F (10.8°C) to a comfortable 61.3°F (16.3°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Mattawa, Washington, with an average temperature ranging between max 71.2°F (21.8°C) and min 49.1°F (9.5°C). A shift in the average high-temperature is noticeable in May, changing from an enjoyable 61.3°F (16.3°C) in April to a pleasant 71.2°F (21.8°C). Weather in May »
Weather in June
June, the first month of the summer in Mattawa, is a warm month, with an average temperature varying between 78.6°F (25.9°C) and 54.1°F (12.3°C). The beginning of June signals a minor rise in the average high-temperature, moving from an agreeable 71.2°F (21.8°C) in May to a moderately hot 78.6°F (25.9°C). Weather in June »
Weather in July
July is a hot summer month in Mattawa, Washington, with temperature in the range of an average high of 88.3°F (31.3°C) and an average low of 60.4°F (15.8°C). The warmest period is usually observed in July and August, with the average high-temperature peaking at 88.3°F (31.3°C). Weather in July »
Weather in August
The last month of the summer, August, is also a hot month in Mattawa, Washington, with an average temperature ranging between max 88.3°F (31.3°C) and min 61.5°F (16.4°C). Mattawa witnesses its peak temperatures during July and August, when the average high-temperature reaches 88.3°F (31.3°C). Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Mattawa, Washington, with an average temperature ranging between min 54.7°F (12.6°C) and max 76.1°F (24.5°C). September ushers in a slight temperature change, with average high-temperatures reducing from August's hot 88.3°F (31.3°C) to a moderately hot 76.1°F (24.5°C). Weather in September »
Weather in October
October, the same as September, in Mattawa, Washington, is another mild autumn month, with temperature in the range of an average high of 60.1°F (15.6°C) and an average low of 43.7°F (6.5°C). As Mattawa steps into October, the average high-temperature decreases significantly from the a warm 76.1°F (24.5°C) of September to a mild 60.1°F (15.6°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Mattawa, Washington, with temperature in the range of an average high of 45.5°F (7.5°C) and an average low of 32.9°F (0.5°C). The start of November signals a clear decrease in the average high-temperature, falling from a refreshing 60.1°F (15.6°C) in October to a chilly 45.5°F (7.5°C). Weather in November »
Weather in December
December, the first month of the winter in Mattawa, is still a cold month, with an average temperature fluctuating between 34.5°F (1.4°C) and 24.3°F (-4.3°C). With average high and low temperatures of 34.5°F (1.4°C) and 24.3°F (-4.3°C) respectively, December is Mattawa's coldest month. Weather in December »
[Resources]Frequently asked questions
What is the most humid month in Mattawa?
The most humid month in Mattawa, Washington, is January, with an average relative humidity of 83%.
What is the rainiest month in Mattawa?
The months with the most rainfall are January and December, with an average 0.87" (22mm) of precipitation.
How much does it rain in Mattawa?
In Mattawa, during the entire year, the rain falls for 86.4 days and collects up to 6.38" (162mm) of precipitation.
When does it snow in Mattawa?
Months with snowfall are January through April, September, November and December.
How much does it snow in Mattawa?
Throughout the year, there are 22.3 snowfall days, and 10" (254mm) of snow is accumulated.
What is the month with the least sunshine in Mattawa?
January has the least sunshine of the year, with an average of 4.9h of sunshine.
When is the lowest UV index in Mattawa?
The months with the lowest UV index in Mattawa are January, February, November and December, with an average maximum UV index of 2.
When is Daylight Saving Time (DST) in Mattawa?
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 Mattawa?
May through August and October are months without snowfall.
When are the longest days in Mattawa?
The month with the longest days in Mattawa is June, with an average of 15h and 48min of daylight.
What part of the year is the hottest in Mattawa?
Mattawa's average highest temperatures are recorded in July and August, reaching a high of 88.3°F (31.3°C).
What is the least humid month in Mattawa?
July is the least humid month in Mattawa, with an average relative humidity of 37%.
What are the months with the most sunshine in Mattawa?
July and August, with an average of 12h of sunshine, are months with the most sunshine.
What is the month with the highest UV index in Mattawa?
The month with the highest UV index is July, with an average maximum UV index of 7.
What is the driest month in Mattawa?
August is the month with the least rainfall. Rain falls for 3.5 days and accumulates 0.2" (5mm) of precipitation.
What is the coldest month in Mattawa?
December proves to be the coldest month, recording an average maximum temperature of 34.5°F (1.4°C) and a minimum temperature of 24.3°F (-4.3°C).
When does it snow the most in Mattawa?
The month with the most snowfall in Mattawa is December, when snow falls for 6.5 days and typically aggregates up to 3.43" (87mm) of snow.
What is the month with the shortest days in Mattawa?
The month with the shortest days is December, with an average of 8h and 36min of daylight.
Average temperature
Mattawa, WA
The warmest months (with the highest average high temperature) are July and August (88.3°F).
The month with the lowest average high temperature is December (34.5°F).
The month with the highest average low temperature is August (61.5°F).
The coldest month (with the lowest average low temperature) is December (24.3°F).
Average pressure
Mattawa, WA
- Average pressure in January:
30.17"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
29.99"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.91"Hg - Average pressure in September:
29.96"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.08"Hg - Average pressure in December:
30.14"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed
Mattawa, WA
- Average wind speed in January:
4.9mph - Average wind speed in February:
5.8mph - Average wind speed in March:
6.8mph - Average wind speed in April:
7.6mph - Average wind speed in May:
7.1mph - Average wind speed in June:
7.2mph
- Average wind speed in July:
6.8mph - Average wind speed in August:
6.4mph - Average wind speed in September:
6.3mph - Average wind speed in October:
5.8mph - Average wind speed in November:
5.8mph - Average wind speed in December:
4.7mph
The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest month (with the lowest average wind speed) is December (4.7mph).
Average humidity
Mattawa, WA
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is July (37%).
Average rainfall
Mattawa, WA
- Average rainfall in January:
0.87" - Average rainfall in February:
0.59" - Average rainfall in March:
0.67" - Average rainfall in April:
0.39" - Average rainfall in May:
0.71" - Average rainfall in June:
0.43"
- Average rainfall in July:
0.24" - Average rainfall in August:
0.2" - Average rainfall in September:
0.31" - Average rainfall in October:
0.59" - Average rainfall in November:
0.51" - Average rainfall in December:
0.87"
The wettest months (with the highest rainfall) are January and December (0.87").
The driest month (with the least rainfall) is August (0.2").
Average rainfall days
Mattawa, WA
- Average rainfall days in January:
8.5 days - Average rainfall days in February:
7.6 days - Average rainfall days in March:
10.6 days - Average rainfall days in April:
8.8 days - Average rainfall days in May:
8.2 days - Average rainfall days in June:
5.5 days
- Average rainfall days in July:
3.8 days - Average rainfall days in August:
3.5 days - Average rainfall days in September:
4.1 days - Average rainfall days in October:
8.6 days - Average rainfall days in November:
9.3 days - Average rainfall days in December:
7.9 days
The month with the highest number of rainy days is March (10.6 days).
The month with the least rainy days is August (3.5 days).
Average snowfall
Mattawa, WA
The month with the highest snowfall is December (3.43").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days
Mattawa, WA
- Average snowfall days in January:
6.3 days - Average snowfall days in February:
5 days - Average snowfall days in March:
2.1 days - Average snowfall days in April:
0.4 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:
0.1 days - Average snowfall days in October:
0.1 days - Average snowfall days in November:
1.8 days - Average snowfall days in December:
6.5 days
The month with the highest number of snowfall days is December (6.5 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight / Average sunshine
Mattawa, WA
- Average daylight in January:
9h and 1min - Average daylight in February:
10h and 2min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 4min - Average daylight in May:
15h and 1min - Average daylight in June:
15h and 5min
- Average daylight in July:
15h and 2min - Average daylight in August:
14h and 1min - Average daylight in September:
12h and 3min - Average daylight in October:
10h and 5min - Average daylight in November:
9h and 2min - Average daylight in December:
8h and 4min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in January:
4h and 5min - Average sunshine in February:
5h and 3min - Average sunshine in March:
7h and 5min - Average sunshine in April:
10h and 2min - Average sunshine in May:
11h and 0min - Average sunshine in June:
11h and 3min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
12h and 0min - Average sunshine in September:
10h and 5min - Average sunshine in October:
6h and 5min - Average sunshine in November:
6h and 1min - Average sunshine in December:
5h and 1min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).
Average sunshine days
Mattawa, WA
- Average sunshine days in January:
18 days - Average sunshine days in February:
16 days - Average sunshine days in March:
17.1 days - Average sunshine days in April:
19 days - Average sunshine days in May:
20.9 days - Average sunshine days in June:
23 days
- Average sunshine days in July:
25.8 days - Average sunshine days in August:
25.8 days - Average sunshine days in September:
24.3 days - Average sunshine days in October:
20.9 days - Average sunshine days in November:
17.9 days - Average sunshine days in December:
18.1 days
The months with the most sunshine days are July and August (25.8 days).
The month with the least sunshine days is February (16 days).
Average UV index
Mattawa, WA
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).
Average cloud cover
Mattawa, WA
The month with the most cloud cover is January (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 10).
Average visibility
Mattawa, WA
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).
Mattawa, Washington, USA
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