Expand
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 another subzero cold winter month in Washington, Iowa, with an average temperature ranging between min 16.5°F (-8.6°C) and max 28.8°F (-1.8°C). January, with an average high of 28.8°F (-1.8°C) and a low of 16.5°F (-8.6°C), signifies the coldest month of the year. Weather in January »
Weather in February
February, the last month of the winter in Washington, is a wintry month, with an average temperature varying between 33.3°F (0.7°C) and 19.9°F (-6.7°C). Entering February, Washington's average high-temperature reads a cold 33.3°F (0.7°C), indicating a close resemblance to the previous month's climate. Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Washington, Iowa, with an average temperature varying between 47.5°F (8.6°C) and 32.5°F (0.3°C). The transition from February to March brings a temperature rise, with average high-temperatures increasing from a wintry 33.3°F (0.7°C) to a chilly 47.5°F (8.6°C). Weather in March »
Weather in April
April is a moderate spring month in Washington, Iowa, with an average temperature ranging between max 59.5°F (15.3°C) and min 43°F (6.1°C). The onset of April brings a rise in the average high-temperature, elevating from a chilly 47.5°F (8.6°C) in March to a moderate 59.5°F (15.3°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Washington, Iowa, with temperature in the range of an average high of 70.2°F (21.2°C) and an average low of 53.8°F (12.1°C). An upsurge in temperatures occurs as April gives way to May, with average highs shifting from a refreshing 59.5°F (15.3°C) to an agreeable 70.2°F (21.2°C). Weather in May »
Weather in June
June, the first month of the summer in Washington, is a warm month, with an average temperature varying between 79.5°F (26.4°C) and 63.1°F (17.3°C). Washington experiences a temperature shift with the start of June, with average high-temperatures moving from an agreeable 70.2°F (21.2°C) in May to a warm 79.5°F (26.4°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Washington, Iowa, with an average temperature varying between 65.1°F (18.4°C) and 82°F (27.8°C). July proves to be the warmest month, recording an average peak temperature of 82°F (27.8°C) and a minimum temperature of 65.1°F (18.4°C). July's heat index is estimated at a hot 89.6°F (32°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Washington, Iowa, with an average temperature fluctuating between 81.1°F (27.3°C) and 63°F (17.2°C). The advent of August brings an average high-temperature of a still warm 81.1°F (27.3°C), exhibiting minor difference from the previous month. Weather in August »
Weather in September
September, the first month of the autumn in Washington, is also a moderately hot month, with an average temperature varying between 56.3°F (13.5°C) and 75.6°F (24.2°C). September's arrival signals a moderate reduction in the average high-temperature, easing from 81.1°F (27.3°C) in August to a still warm 75.6°F (24.2°C). Weather in September »
Weather in October
October, the same as September, is another comfortable autumn month in Washington, Iowa, with an average temperature varying between 61.5°F (16.4°C) and 45.3°F (7.4°C). In October, the meteorological conditions alter, with the average high-temperature shifting from a warm 75.6°F (24.2°C) in September to an enjoyable 61.5°F (16.4°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Washington, Iowa, with an average temperature varying between 33.6°F (0.9°C) and 47.3°F (8.5°C). In November, the meteorological conditions alter, with the average high-temperature shifting from an enjoyable 61.5°F (16.4°C) in October to a frosty 47.3°F (8.5°C). Weather in November »
Weather in December
December, the first month of the winter in Washington, is also a wintry month, with an average temperature fluctuating between 24.1°F (-4.4°C) and 34.9°F (1.6°C). Start of December brings a shift in the average high-temperature, falling from November's frosty 47.3°F (8.5°C) to a cold 34.9°F (1.6°C). Weather in December »
Updated: Feb 12, 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 time of the year is the coldest in Washington?
The coldest temperatures occur during January, when averages reach a peak of 28.8°F (-1.8°C) and a low of 16.5°F (-8.6°C).
What are the most humid months in Washington?
The months with the highest humidity are January and July, with an average relative humidity of 83%.
How much does it rain in Washington?
Throughout the year, in Washington, Iowa, there are 123.7 rainfall days, and 18.94" (481mm) of precipitation is accumulated.
When does it snow in Washington?
January through April, October through December are months with snowfall.
When does it snow the most in Washington?
January is the month with the most snowfall. Snow falls for 8.9 days and accumulates 2.52" (64mm) of snow.
How much does it snow in Washington?
In Washington, during the entire year, snow falls for 29.8 days and aggregates up to 7.99" (203mm) of snow.
What is the month with the least sunshine in Washington?
The month with the least sunshine in Washington, Iowa, is January, with an average of 4.2h of sunshine.
When is the lowest UV index in Washington?
The month with the lowest UV index in Washington, Iowa, is January, with an average maximum UV index of 1.
When is Daylight Saving Time (DST) in Washington?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Washington, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
What is the wettest month in Washington?
May is the month with the most rainfall. Rain falls for 17 days and accumulates 2.91" (74mm) of precipitation.
When it does not snow in Washington?
May through September are months without snowfall in Washington, Iowa.
When are the longest days in Washington?
With an average of 15h and 6min of daylight, June has the longest days of the year.
When is the highest UV index in Washington?
The months with the highest UV index in Washington, Iowa, are June and July, with an average maximum UV index of 6.
What time of the year is the hottest in Washington?
With its average high temperature of 82°F (27.8°C) and a low of 65.1°F (18.4°C), July is regarded as the warmest month in Washington.
What month has the most sunshine in Washington?
With an average of 10.2h of sunshine, July has the most sunshine of the year in Washington.
What is the least humid month in Washington?
The least humid month is October, with an average relative humidity of 72%.
What is the driest month in Washington?
December is the month with the least rainfall in Washington, Iowa. Rain falls for 5.8 days and accumulates 0.71" (18mm) of precipitation.
What is the month with the shortest days in Washington?
December has the shortest days of the year in Washington, Iowa, with an average of 9h and 18min of daylight.
Average temperature
Washington, IA
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (28.8°F).
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).
Average pressure
Washington, IA
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.13"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.9"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
Washington, IA
- Average wind speed in January:
10.7mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10.5mph - Average wind speed in April:
10.6mph - Average wind speed in May:
8.9mph - Average wind speed in June:
7.8mph
- Average wind speed in July:
6.9mph - Average wind speed in August:
6.8mph - Average wind speed in September:
7.9mph - Average wind speed in October:
9.6mph - Average wind speed in November:
10.4mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity
Washington, IA
The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Washington, IA
- Average rainfall in January:
0.79" - Average rainfall in February:
0.75" - Average rainfall in March:
1.22" - Average rainfall in April:
1.97" - Average rainfall in May:
2.91" - Average rainfall in June:
2.87"
- Average rainfall in July:
2.01" - Average rainfall in August:
1.34" - Average rainfall in September:
1.65" - Average rainfall in October:
1.54" - Average rainfall in November:
1.18" - Average rainfall in December:
0.71"
The wettest month (with the highest rainfall) is May (2.91").
The driest month (with the least rainfall) is December (0.71").
Average rainfall days
Washington, IA
- Average rainfall days in January:
4.4 days - Average rainfall days in February:
4.2 days - Average rainfall days in March:
10.9 days - Average rainfall days in April:
12.7 days - Average rainfall days in May:
17 days - Average rainfall days in June:
16.1 days
- Average rainfall days in July:
13.8 days - Average rainfall days in August:
11.8 days - Average rainfall days in September:
9.5 days - Average rainfall days in October:
10.2 days - Average rainfall days in November:
7.3 days - Average rainfall days in December:
5.8 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (4.2 days).
Average snowfall
Washington, IA
The month with the highest snowfall is January (2.52").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Washington, IA
- Average snowfall days in January:
8.9 days - Average snowfall days in February:
7.9 days - Average snowfall days in March:
4.5 days - Average snowfall days in April:
0.9 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:
0.4 days - Average snowfall days in November:
1.5 days - Average snowfall days in December:
5.7 days
The month with the highest number of snowfall days is January (8.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Washington, IA
- Average daylight in January:
9h and 4min - 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 3min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
4h and 1min - Average sunshine in February:
4h and 2min - Average sunshine in March:
6h and 4min - Average sunshine in April:
8h and 0min - Average sunshine in May:
8h and 5min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
10h and 1min - Average sunshine in September:
9h and 3min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 3min - Average sunshine in December:
4h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days
Washington, IA
- Average sunshine days in January:
18.1 days - Average sunshine days in February:
17 days - Average sunshine days in March:
16.6 days - Average sunshine days in April:
14 days - Average sunshine days in May:
10.9 days - Average sunshine days in June:
11 days
- Average sunshine days in July:
12.9 days - Average sunshine days in August:
15.5 days - Average sunshine days in September:
18.1 days - Average sunshine days in October:
19 days - Average sunshine days in November:
20.3 days - Average sunshine days in December:
20.5 days
The month with the most sunshine days is December (20.5 days).
The month with the least sunshine days is May (10.9 days).
Average UV index
Washington, IA
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Washington, IA
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are August and September (Cloud cover 29).
Average visibility
Washington, IA
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
Washington, Iowa, USA
Weather forecast for your location
1. Click Locate me button
2. Allow the app to use your location
2. Allow the app to use your location