Climate and monthly weather forecastChelan, WA
Climate and monthly weather forecast
The climate of Chelan
Residing in the humid continental climate zone, Chelan, Washington is designated as 'Dsb' under the Köppen climate classification. This categorization indicates the dominant presence of a humid continental climate with dry, warm summers. Located in the northern part of the United States, the weather in Chelan experiences significant temperature variations, shifting through cold winters and moderately warm summers.Year-round, humidity ranges from a high of 90% in January to a low of 43% in July and August. The temperature fluctuates from a peak average high of 82.2°F (27.9°C) in July to a low of 19°F (-7.2°C) in January. Meanwhile, annual precipitation follows a similar variation, from a yearly maximum of 1.65" (42mm) in December to a minimal 0.16" (4mm) in July. This pattern shows a higher tendency for rainfall during the colder months.
Distinctive weather characteristics in Chelan include a sharp decrease in rainfall from winter to summer, resulting in comparatively dry, warm summer months. Meanwhile, the winter months showcase a notable spike in snowfall, attaining a peak of 9.06" (230mm) in December. Sunshine hours display an inverse relationship with both rainfall and snowfall, attaining a maximum of 12 hours in July and August, concurrent with the driest months, and a low of 4.1 hours in January, the snowiest month.
The best time to visit Chelan
Considering temperature, precipitation patterns, and sunshine hours, June through August will be the optimal time to visit Chelan. During this period, the city experiences its highest temperatures, peaking at 82.2°F (27.9°C) in July, along with low rainfall, reaching a low of 0.16" (4mm) in July. These ideal weather conditions are further bolstered by an abundance of sunshine, with daily sunlight hours reaching a maximum of 12 hours in July and August. The UV index during these sunny summer months hits a level 5 to 6, so sunscreen is highly recommended.The worst time to visit Chelan
Travelers wanting to avoid cold temperatures and heavy snowfall should refrain from visiting Chelan between December and February. During this period, temperatures can drop to a low average of 19°F (-7.2°C) in both January and February. Moreover, December sees the most substantial snowfall of 9.06" (230mm). Alongside the cold and snowy conditions, these months also experience decreased daylight, with the shortest day length of 8.5 hours in December.Spring weather in Chelan
During the months of March, April, and May, Chelan transitions from winter to spring. The temperature increases gradually from an average high of 43.2°F (6.2°C) in March to 65.3°F (18.5°C) in May. Rainfall remains unpredictable in this transition though, with a slight decrease from 1.22" (31mm) in March to 1.1" (28mm) in May. During this period, daylight extends from 11.9 hours in March to 15.2 hours in May.Summer weather in Chelan
Summer, spanning from June to August, is the warmest season in Chelan. Temperatures reach a peak average high of 82.2°F (27.9°C) in July and low rainfall, reaching a bottom of 0.16" (4mm), also in July. Daylight peaks at 16 hours in June, and it slowly decreases to 14.2 hours in August. This season sees low humidity, with the relative humidity hitting its lowest at 43% in July and August.Autumn weather in Chelan
Autumn overlaps with September, October, and November in Chelan. During this time, temperatures start to drop from an average high of 70.5°F (21.4°C) in September to a low of 40.1°F (4.5°C) in November. Rainfall also increases during the autumn months, starting at 0.55" (14mm) in September and reaching 1.02" (26mm) in November. Daylight hours decrease from 12.6 hours in September to 9.3 hours in November.Winter weather in Chelan
Winter commences in December and continues through February. The coldest months of the year, January and February both see average low temperatures of 19°F (-7.2°C). The highest level of snowfall occurs during this period, hitting 9.06" (230mm) in December. Daylight is particularly limited, bottoming out at 8.5 hours in December. Despite the cold conditions, winter also brings with it the highest relative humidity, averaging 88% in December and 90% in January.Weather in January
The start of the year in Chelan, Washington reveals the harshest of winter's grip. In January, the weather lends itself to the lovers of cold, only reaching a maximum high temperature of 30.9°F (-0.6°C), with the month displaying a significant dip in the mercury dipping low to 19°F (-7.2°C). Weather in January »Weather in February
Transitioning from the severe cold of January, February carries forward the winter charm but with less intensity. The chill mellows a bit to city's relief and temperatures hover between highs of 34.2°F (1.2°C) and lows of 20.8°F (-6.2°C). Weather in February »Weather in March
When March arrives, Chelan, Washington ushers in the dawn of spring with a pleasant shift in weather. The temperatures begin to soar to a more comfortable average high of 43.2°F (6.2°C) and an average low of 28.2°F (-2.1°C). With March approaching, Chelan, Washington anticipates a noticeable drop in snowfall from the higher amounts seen in the winter months. Weather in March »Weather in April
As spring finds its footing in April, Chelan, Washington's weather showcases noticeable enhancements, attributing a lively vibe to the city. The city's weather embraces average high temperatures rising to 54.3°F (12.4°C). The rainfall, around 0.63in, does not see a significant change compared to March, keeping the pleasant humidity levels intact. Weather in April »Weather in May
May marks the commencement of warm summer days in Chelan, Washington. Significantly warmer than April, May witnesses average low temperatures rising to 43.2°F (6.2°C). The change from spring to early summer is accentuated with a noticeable increase in daylight, reaching up to 15.2 hours per day. Weather in May »Weather in June
June flaunts the full-blown summer spell in Chelan, Washington, making it a preferred month for outdoor activities. Average high temperature reaches 72.1°F (22.3°C), extending a warm invitation to all the outdoor aficionados. Days are quite long with a maximum of 16 daylight hours, offering opportunities to relish outdoor activities till late into the evening. Weather in June »Weather in July
July epitomizes the peak of summer in Chelan, Washington, resulting in significant weather shifts. The city observes its maximum temperature pinnacles with an average high of 82.2°F (27.9°C). This period marks the lowest humidity throughout the year, only 43%, which counterbalances the high temperatures making it more tolerable. Weather in July »Weather in August
August continues to exhibit the summer charm of Chelan, Washington, maintaining similar weather patterns to July. Maintaining high heats, August matches July with the equally warm average high temperature of 81.9°F (27.7°C). The city experiences the summer’s end with long sunny days and relatively low levels of humidity. Weather in August »Weather in September
September marks the onset of autumn in Chelan, Washington, bringing a gradual drop in temperatures. This month’s weather dynamics indicate a soothing respite from summer’s heat, with an average high temperature dropping to 70.5°F (21.4°C). Weather in September »Weather in October
October transforms Chelan, Washington with its vivid autumn hues and considerably cooler weather pattern. The weather observes a substantial dip in the average high temperature, dropping to 54.5°F (12.5°C). October attracts autumn enthusiasts with its vibrant fall foliage adding hues of crimson, orange, and yellow against a cooler weather backdrop. Weather in October »Weather in November
Chelan, Washington introduces the chilling winter season in November. A significant decrease in temperature is observed within this month, with an average low of 27.9°F (-2.3°C). The first snowflakes begin to grace the city in November, sweeping away the lively autumn colors. Weather in November »Weather in December
December personifies the heart of winter in Chelan, Washington, with frigid temperatures and generous snowfall. Matching January's weather conditions, December's average low temperatures hit a freezing 19°F (-7.2°C). The city gets draped in a white blanket with the highest snowfall of the year, recording 9.06in. Weather in December »Updated: Feb 14, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January is the most humid month in Chelan, with an average relative humidity of 90%.
In Chelan, during the entire year, the rain falls for 99.9 days and collects up to 10.47" (266mm) of precipitation.
January through April, September through December are months with snowfall.
In Chelan, during the entire year, snow falls for 48.7 days and aggregates up to 28.62" (727mm) of snow.
With an average of 4.1h of sunshine, January has the least sunshine of the year in Chelan.
January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Chelan, Washington.
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.
In Chelan, snow does not fall in May through August.
June has the longest days of the year in Chelan, Washington, with an average of 16h and 0min of daylight.
July is the warmest month of the year, registering average temperatures as high as 82.2°F (27.9°C) and as low as 55°F (12.8°C).
July and August, with an average relative humidity of 43%, are the least humid months.
The month with the least rainfall in Chelan, Washington, is July, when the rain falls for 4.1 days and typically collects 0.16" (4mm) of precipitation.
The months with the most sunshine are July and August, with an average of 12h of sunshine.
With an average maximum UV index of 6, July is the month with the highest UV index in Chelan, Washington.
December proves to be the coldest month in Chelan, recording an average maximum temperature of 30.2°F (-1°C) and a minimum temperature of 19°F (-7.2°C).
December is the month with the most rainfall in Chelan. Rain falls for 7.5 days and accumulates 1.65" (42mm) of precipitation.
The month with the most snowfall is December, when snow falls for 11.9 days and typically aggregates up to 9.06" (230mm) of snow.
The month with the shortest days in Chelan is December, with an average of 8h and 30min of daylight.
Average temperature
Chelan, WA
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is December (30.2°F).
The month with the highest average low temperature is August (55.8°F).
The coldest months (with the lowest average low temperature) are January and December (19°F).
Average pressure
Chelan, WA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
30"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.94"Hg
- Average pressure in July:
29.95"Hg - Average pressure in August:
29.93"Hg - Average pressure in September:
29.97"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).
Average wind speed
Chelan, WA
- Average wind speed in January:
3.5mph - Average wind speed in February:
4mph - Average wind speed in March:
4.7mph - Average wind speed in April:
5.7mph - Average wind speed in May:
5.7mph - Average wind speed in June:
6.1mph
- Average wind speed in July:
6mph - Average wind speed in August:
5.8mph - Average wind speed in September:
5.3mph - Average wind speed in October:
4.5mph - Average wind speed in November:
4mph - Average wind speed in December:
3.5mph
The windiest month (with the highest average wind speed) is June (6.1mph).
The calmest months (with the lowest average wind speed) are January and December (3.5mph).
Average humidity
Chelan, WA
The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are July and August (43%).
Average rainfall
Chelan, WA
- Average rainfall in January:
1.5" - Average rainfall in February:
0.91" - Average rainfall in March:
1.22" - Average rainfall in April:
0.63" - Average rainfall in May:
1.1" - Average rainfall in June:
0.55"
- Average rainfall in July:
0.16" - Average rainfall in August:
0.28" - Average rainfall in September:
0.55" - Average rainfall in October:
0.91" - Average rainfall in November:
1.02" - Average rainfall in December:
1.65"
The wettest month (with the highest rainfall) is December (1.65").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days
Chelan, WA
- Average rainfall days in January:
8.6 days - Average rainfall days in February:
8.4 days - Average rainfall days in March:
12.8 days - Average rainfall days in April:
10.4 days - Average rainfall days in May:
9.5 days - Average rainfall days in June:
6.4 days
- Average rainfall days in July:
4.1 days - Average rainfall days in August:
3.8 days - Average rainfall days in September:
6.7 days - Average rainfall days in October:
10.5 days - Average rainfall days in November:
11.2 days - Average rainfall days in December:
7.5 days
The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is August (3.8 days).
Average snowfall
Chelan, WA
The month with the highest snowfall is December (9.06").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days
Chelan, WA
- Average snowfall days in January:
12 days - Average snowfall days in February:
10.5 days - Average snowfall days in March:
6 days - Average snowfall days in April:
1.2 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:
0.3 days - Average snowfall days in October:
0.5 days - Average snowfall days in November:
6.3 days - Average snowfall days in December:
11.9 days
The month with the highest number of snowfall days is January (12 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight / Average sunshine
Chelan, 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:
16h and 0min
- Average daylight in July:
15h and 36min - Average daylight in August:
14h and 12min - Average daylight in September:
12h and 36min - 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: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in January:
4h and 6min - Average sunshine in February:
4h and 36min - Average sunshine in March:
7h and 12min - Average sunshine in April:
10h and 18min - Average sunshine in May:
10h and 54min - Average sunshine in June:
11h and 30min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
12h and 0min - Average sunshine in September:
10h and 42min - Average sunshine in October:
6h and 24min - Average sunshine in November:
5h and 36min - Average sunshine in December:
4h and 30min
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 6min).
Average sunshine days
Chelan, WA
- Average sunshine days in January:
14.4 days - Average sunshine days in February:
13.5 days - Average sunshine days in March:
13.2 days - Average sunshine days in April:
16.3 days - Average sunshine days in May:
18.2 days - Average sunshine days in June:
22 days
- Average sunshine days in July:
25.7 days - Average sunshine days in August:
24.8 days - Average sunshine days in September:
21.7 days - Average sunshine days in October:
19.2 days - Average sunshine days in November:
13.5 days - Average sunshine days in December:
15.2 days
The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is March (13.2 days).
Average UV index
Chelan, WA
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover
Chelan, WA
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility
Chelan, WA
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
