Climate and monthly weather forecastMountlake Terrace, WA
Climate and monthly weather forecast
Weather in January
January, the same as December, in Mountlake Terrace, Washington, is a frosty winter month, with temperature in the range of an average low of 37°F (2.8°C) and an average high of 45.1°F (7.3°C). With the start of January, Mountlake Terrace measures an average high-temperature of a still frosty 45.1°F (7.3°C), not significantly differing from December's 43.3°F (6.3°C). Weather in January »Weather in February
The last month of the winter, February, is another chilly month in Mountlake Terrace, Washington, with an average temperature fluctuating between 46°F (7.8°C) and 36°F (2.2°C). The advent of February signifies a minor shift to an average high-temperature of a still frosty 46°F (7.8°C), aligning closely with January. Weather in February »Weather in March
March, the first month of the spring in Mountlake Terrace, is a fresh month, with an average temperature varying between 38.3°F (3.5°C) and 50°F (10°C). The advent of March sees the average high-temperature at a fresh 50°F (10°C), subtly shifted from February's 46°F (7.8°C). Weather in March »Weather in April
April, like March, in Mountlake Terrace, Washington, is another fresh spring month, with an average temperature ranging between min 41.5°F (5.3°C) and max 55.2°F (12.9°C). Mountlake Terrace's weather in April, with an average high-temperature of a still cool 55.2°F (12.9°C), subtly shifts from March's 50°F (10°C). Weather in April »Weather in May
The last month of the spring, May, is a comfortable month in Mountlake Terrace, Washington, with an average temperature ranging between min 45.5°F (7.5°C) and max 62.8°F (17.1°C). May brings a slight rise in Mountlake Terrace's average high-temperature, moving from a cool 55.2°F (12.9°C) in April to a comfortable 62.8°F (17.1°C). Weather in May »Weather in June
The first month of the summer, June, is still a comfortable month in Mountlake Terrace, Washington, with temperature in the range of an average low of 49.3°F (9.6°C) and an average high of 67.3°F (19.6°C). The commencement of June records an average high-temperature of a still comfortable 67.3°F (19.6°C), barely varying from May's 62.8°F (17.1°C). Weather in June »Weather in July
July is an agreeable summer month in Mountlake Terrace, Washington, with an average temperature ranging between min 52.9°F (11.6°C) and max 72.9°F (22.7°C). As Mountlake Terrace, Washington, transitions into July, the average high-temperature is observed to slightly rise from a refreshing 67.3°F (19.6°C) in June to an agreeable 72.9°F (22.7°C). Weather in July »Weather in August
August, the last month of the summer in Mountlake Terrace, is a warm month, with an average temperature ranging between min 54.1°F (12.3°C) and max 73.9°F (23.3°C). August registers as the month with the highest average temperatures, reaching 73.9°F (23.3°C) at its peak and 54.1°F (12.3°C) at the lowest. Weather in August »Weather in September
The first month of the autumn, September, is still a comfortable month in Mountlake Terrace, Washington, with an average temperature fluctuating between 67.6°F (19.8°C) and 51.6°F (10.9°C). September brings a slight decrease in the average high-temperature, shifting from a moderately hot 73.9°F (23.3°C) in August to an enjoyable 67.6°F (19.8°C). Weather in September »Weather in October
October, like September, is a moderate autumn month in Mountlake Terrace, Washington, with an average temperature fluctuating between 45.9°F (7.7°C) and 57.9°F (14.4°C). In October, the average high-temperature decreases from a comfortable 67.6°F (19.8°C) in September to a moderate 57.9°F (14.4°C). Weather in October »Weather in November
The last month of the autumn, November, is another chilly month in Mountlake Terrace, Washington, with temperature in the range of an average low of 40.5°F (4.7°C) and an average high of 48.4°F (9.1°C). The onset of November results in a decrease in the average high-temperature, receding from a mild 57.9°F (14.4°C) in October to a frosty 48.4°F (9.1°C). Weather in November »Weather in December
December, the first month of the winter in Mountlake Terrace, is still a chilly month, with an average temperature fluctuating between 43.3°F (6.3°C) and 35.8°F (2.1°C). With an average high-temperature of 43.3°F (6.3°C) and an average low-temperature of 35.8°F (2.1°C), December is the coldest month. Weather in December »Updated: Feb 14, 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
January, February and December, with an average relative humidity of 84%, are most humid months in Mountlake Terrace, Washington.
Throughout the year, there are 173 rainfall days, and 25" (635mm) of precipitation is accumulated.
Months with snowfall are January through April, November and December.
Throughout the year, in Mountlake Terrace, there are 12.5 snowfall days, and 6.65" (169mm) of snow is accumulated.
With an average of 4.5h of sunshine, January has the least sunshine of the year.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
February is the month with the most snowfall. Snow falls for 4.7 days and accumulates 3.58" (91mm) of snow.
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.
May through October are months without snowfall in Mountlake Terrace.
With an average of 15h and 54min of daylight, June has the longest days of the year.
June and July, with an average maximum UV index of 5, are months with the highest UV index.
With an average relative humidity of 72%, July is the least humid month.
July is the month with the least rainfall in Mountlake Terrace, Washington. Rain falls for 7.7 days and accumulates 0.39" (10mm) of precipitation.
The month of August, characterized by an average high of 73.9°F (23.3°C) and a low of 54.1°F (12.3°C), is recognized as the warmest in Mountlake Terrace.
With an average of 10.8h of sunshine, August has the most sunshine of the year in Mountlake Terrace, Washington.
December proves to be the coldest month, recording an average maximum temperature of 43.3°F (6.3°C) and a minimum temperature of 35.8°F (2.1°C).
The month with the most rainfall in Mountlake Terrace, Washington, is December, when the rain falls for 17.6 days and typically aggregates up to 3.5" (89mm) of precipitation.
With an average of 8h and 30min of daylight, December has the shortest days of the year in Mountlake Terrace, Washington.
Average temperature
Mountlake Terrace, WA
The warmest month (with the highest average high temperature) is August (73.9°F).
The month with the lowest average high temperature is December (43.3°F).
The month with the highest average low temperature is August (54.1°F).
The coldest month (with the lowest average low temperature) is December (35.8°F).
Average pressure
Mountlake Terrace, WA
- Average pressure in January:
30.09"Hg - Average pressure in February:
30.06"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
30.04"Hg - Average pressure in May:
30.02"Hg - Average pressure in June:
30.02"Hg
- Average pressure in July:
30.04"Hg - Average pressure in August:
30.01"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.04"Hg - Average pressure in December:
30.08"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed
Mountlake Terrace, WA
- Average wind speed in January:
5.8mph - Average wind speed in February:
5.4mph - Average wind speed in March:
5.8mph - Average wind speed in April:
5.1mph - Average wind speed in May:
4.2mph - Average wind speed in June:
3.9mph
- Average wind speed in July:
3.6mph - Average wind speed in August:
3.5mph - Average wind speed in September:
4mph - Average wind speed in October:
4.9mph - Average wind speed in November:
5.9mph - Average wind speed in December:
5.5mph
The windiest month (with the highest average wind speed) is November (5.9mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity
Mountlake Terrace, WA
The months with the highest relative humidity are January, February and December (84%).
The month with the lowest relative humidity is July (72%).
Average rainfall
Mountlake Terrace, WA
- Average rainfall in January:
3.31" - Average rainfall in February:
2.64" - Average rainfall in March:
2.64" - Average rainfall in April:
2.01" - Average rainfall in May:
1.57" - Average rainfall in June:
1.06"
The wettest month (with the highest rainfall) is December (3.5").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days
Mountlake Terrace, WA
- Average rainfall days in January:
17.4 days - Average rainfall days in February:
15.1 days - Average rainfall days in March:
19.8 days - Average rainfall days in April:
17.3 days - Average rainfall days in May:
13.3 days - Average rainfall days in June:
12.2 days
- Average rainfall days in July:
7.7 days - Average rainfall days in August:
6.8 days - Average rainfall days in September:
11.9 days - Average rainfall days in October:
15.5 days - Average rainfall days in November:
18.4 days - Average rainfall days in December:
17.6 days
The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (6.8 days).
Average snowfall
Mountlake Terrace, WA
The month with the highest snowfall is February (3.58").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Mountlake Terrace, WA
- Average snowfall days in January:
2.3 days - Average snowfall days in February:
4.7 days - Average snowfall days in March:
2.2 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 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.7 days - Average snowfall days in December:
2.2 days
The month with the highest number of snowfall days is February (4.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Mountlake Terrace, WA
- Average daylight in January:
8h and 54min - Average daylight in February:
10h and 18min - Average daylight in March:
11h and 54min - Average daylight in April:
13h and 42min - Average daylight in May:
15h and 12min - Average daylight in June:
15h and 54min
- Average daylight in July:
15h and 30min - Average daylight in August:
14h and 12min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 48min - Average daylight in November:
9h and 18min - Average daylight in December:
8h and 30min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in January:
4h and 30min - Average sunshine in February:
4h and 42min - Average sunshine in March:
6h and 30min - Average sunshine in April:
8h and 24min - Average sunshine in May:
9h and 30min - Average sunshine in June:
9h and 36min
- Average sunshine in July:
10h and 30min - Average sunshine in August:
10h and 48min - Average sunshine in September:
9h and 30min - Average sunshine in October:
5h and 42min - Average sunshine in November:
4h and 48min - Average sunshine in December:
4h and 36min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days
Mountlake Terrace, WA
- Average sunshine days in January:
10.5 days - Average sunshine days in February:
9.8 days - Average sunshine days in March:
9.4 days - Average sunshine days in April:
9.8 days - Average sunshine days in May:
14.6 days - Average sunshine days in June:
14.4 days
- Average sunshine days in July:
21.3 days - Average sunshine days in August:
22.5 days - Average sunshine days in September:
15.9 days - Average sunshine days in October:
13.3 days - Average sunshine days in November:
9.2 days - Average sunshine days in December:
10.8 days
The month with the most sunshine days is August (22.5 days).
The month with the least sunshine days is November (9.2 days).
Average UV index
Mountlake Terrace, WA
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Mountlake Terrace, WA
The months with the most cloud cover are January and December (Cloud cover 53).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility
Mountlake Terrace, WA
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
