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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, is another cold winter month in Rock Island, Washington, with an average temperature fluctuating between 33.1°F (0.6°C) and 21.6°F (-5.8°C). In January, Rock Island's weather conditions record an average high-temperature of a still icy 33.1°F (0.6°C), demonstrating little divergence from the preceding month. Weather in January »
Weather in February
February, the last month of the winter in Rock Island, is also an icy month, with an average temperature fluctuating between 24.1°F (-4.4°C) and 36.3°F (2.4°C). The advent of February observes an average high-temperature of a still wintry 36.3°F (2.4°C), nearly identical to January's 33.1°F (0.6°C). Weather in February »
Weather in March
March, the first month of the spring in Rock Island, is a chilly month, with an average temperature ranging between min 29.7°F (-1.3°C) and max 45.3°F (7.4°C). In Rock Island, the average high-temperature in March rises, from a wintry 36.3°F (2.4°C) in February, to a chilly 45.3°F (7.4°C). Weather in March »
Weather in April
April in Rock Island, Washington, is a moderate spring month, with an average temperature fluctuating between 35.6°F (2°C) and 55.4°F (13°C). As April arrives, Rock Island's weather shows an increase in high-temperatures, moving from March's chilly 45.3°F (7.4°C) to a refreshing 55.4°F (13°C). Weather in April »
Weather in May
The last month of the spring, May, is an enjoyable month in Rock Island, Washington, with an average temperature fluctuating between 66°F (18.9°C) and 43.3°F (6.3°C). In Rock Island, stepping into May brings a temperature increase, moving up from April's moderate 55.4°F (13°C) to a still refreshing 66°F (18.9°C). Weather in May »
Weather in June
The first month of the summer, June, is a pleasant month in Rock Island, Washington, with an average temperature ranging between min 48.2°F (9°C) and max 73°F (22.8°C). Observing a minor shift, the average high-temperature during June adjusts from May's enjoyable 66°F (18.9°C) to a pleasant 73°F (22.8°C). Weather in June »
Weather in July
July in Rock Island, Washington, is a warm summer month, with temperature in the range of an average high of 83.1°F (28.4°C) and an average low of 55.4°F (13°C). July, on average, is the warmest month, registering a high temperature of 83.1°F (28.4°C) and a low of 55.4°F (13°C). The average heat index in July is computed to be 82.4°F (28°C). Weather in July »
Weather in August
August, the last month of the summer in Rock Island, is another warm month, with an average temperature ranging between min 56.3°F (13.5°C) and max 82.9°F (28.3°C). Rock Island signifies an average high-temperature of a still moderately hot 82.9°F (28.3°C) in August, closely mirroring the 83.1°F (28.4°C) of July. Weather in August »
Weather in September
The first month of the autumn, September, is still a pleasant month in Rock Island, Washington, with temperature in the range of an average low of 49.6°F (9.8°C) and an average high of 71.6°F (22°C). September's onset brings a slight change in high-temperatures, falling from a moderately hot 82.9°F (28.3°C) in August to an agreeable 71.6°F (22°C). Weather in September »
Weather in October
October, the same as September, in Rock Island, Washington, is another refreshing autumn month, with an average temperature ranging between min 39.7°F (4.3°C) and max 55.9°F (13.3°C). The start of October signals a considerable reduction in the average high-temperature, receding from a pleasant 71.6°F (22°C) in September to a refreshing 55.9°F (13.3°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a wintry month in Rock Island, Washington, with an average temperature ranging between min 29.8°F (-1.2°C) and max 41.7°F (5.4°C). November comes with a decrease in the average high-temperature, falling from a refreshing 55.9°F (13.3°C) in October to a wintry 41.7°F (5.4°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Rock Island, Washington, with an average temperature varying between 20.7°F (-6.3°C) and 32.4°F (0.2°C). Temperature readings reach their annual highs in December, averaging 32.4°F (0.2°C) and a minimum average of 20.7°F (-6.3°C). Weather in December »
[Resources]Frequently asked questions
What is the most humid month in Rock Island?
January is the most humid month in Rock Island, with an average relative humidity of 88%.
What is the rainiest month in Rock Island?
The wettest months in Rock Island are January and December, with an average 1.57" (40mm) of rainfall.
How much does it rain in Rock Island?
Throughout the year, in Rock Island, there are 111.7 rainfall days, and 10.71" (272mm) of precipitation is accumulated.
When does it snow in Rock Island?
January through April, September, November and December are months with snowfall.
How much does it snow in Rock Island?
Throughout the year, in Rock Island, there are 31.6 snowfall days, and 18.86" (479mm) of snow is accumulated.
What is the month with the least sunshine in Rock Island?
January has the least sunshine of the year in Rock Island, Washington, with an average of 4.7h of sunshine.
What are the months with the lowest UV index in Rock Island?
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
When is Daylight Saving Time (DST) in Rock Island?
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 Rock Island?
May through August and October are months without snowfall in Rock Island, Washington.
When are the longest days in Rock Island?
With an average of 15h and 54min of daylight, June has the longest days of the year in Rock Island, Washington.
What is the warmest month in Rock Island?
In Rock Island, Washington, the average highest temperatures are observed in July, with a high of 83.1°F (28.4°C) and a low of 55.4°F (13°C).
What are the least humid months in Rock Island?
The months with the lowest humidity are July and August, with an average relative humidity of 44%.
What is the driest month in Rock Island?
July and August are months with the least rain in Rock Island, Washington, when the rain falls for 4.2 days and typically aggregates up to 0.24" (6mm) of rain.
When is the highest UV index in Rock Island?
With an average maximum UV index of 6, July is the month with the highest UV index.
What month has the most sunshine in Rock Island?
August has the most sunshine of the year in Rock Island, Washington, with an average of 12.1h of sunshine.
What part of the year is the coldest in Rock Island?
December, marked by an average high-temperature of 32.4°F (0.2°C) and a low-temperature of 20.7°F (-6.3°C), is the coldest month in Rock Island.
What is the snowiest month in Rock Island?
December is the month with the most snowfall in Rock Island, Washington. Snow falls for 9.5 days and accumulates 5.98" (152mm) of snow.
What is the month with the shortest days in Rock Island?
December has the shortest days of the year in Rock Island, with an average of 8h and 30min of daylight.
Average temperature
Rock Island, WA
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is December (32.4°F).
The month with the highest average low temperature is August (56.3°F).
The coldest month (with the lowest average low temperature) is December (20.7°F).
Average pressure
Rock Island, WA
- Average pressure in January:
30.15"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 (30.15"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).
Average wind speed
Rock Island, WA
- Average wind speed in January:
3.8mph - Average wind speed in February:
4.3mph - Average wind speed in March:
5mph - Average wind speed in April:
6.1mph - Average wind speed in May:
6mph - Average wind speed in June:
6.5mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
5.9mph - Average wind speed in September:
5.4mph - Average wind speed in October:
4.7mph - Average wind speed in November:
4.3mph - Average wind speed in December:
3.7mph
The windiest month (with the highest average wind speed) is June (6.5mph).
The calmest month (with the lowest average wind speed) is December (3.7mph).
Average humidity
Rock Island, WA
The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are July and August (44%).
Average rainfall
Rock Island, WA
- Average rainfall in January:
1.57" - Average rainfall in February:
1.02" - Average rainfall in March:
1.18" - Average rainfall in April:
0.67" - Average rainfall in May:
1.18" - Average rainfall in June:
0.47"
- Average rainfall in July:
0.24" - Average rainfall in August:
0.24" - Average rainfall in September:
0.59" - Average rainfall in October:
0.98" - Average rainfall in November:
0.98" - Average rainfall in December:
1.57"
The wettest months (with the highest rainfall) are January and December (1.57").
The driest months (with the least rainfall) are July and August (0.24").
Average rainfall days
Rock Island, WA
- Average rainfall days in January:
11.2 days - Average rainfall days in February:
11.3 days - Average rainfall days in March:
13.8 days - Average rainfall days in April:
11.8 days - Average rainfall days in May:
10.8 days - Average rainfall days in June:
6.1 days
- Average rainfall days in July:
4.2 days - Average rainfall days in August:
3.8 days - Average rainfall days in September:
6 days - Average rainfall days in October:
11.1 days - Average rainfall days in November:
11.9 days - Average rainfall days in December:
9.7 days
The month with the highest number of rainy days is March (13.8 days).
The month with the least rainy days is August (3.8 days).
Average snowfall
Rock Island, WA
The month with the highest snowfall is December (5.98").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days
Rock Island, WA
- Average snowfall days in January:
7.8 days - Average snowfall days in February:
7.2 days - Average snowfall days in March:
3.5 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 days - Average snowfall days in November:
3.1 days - Average snowfall days in December:
9.5 days
The month with the highest number of snowfall days is December (9.5 days).
The months with the least snowfall days are May, June, July, August and October (0 days).
Average daylight / Average sunshine
Rock Island, WA
- Average daylight in January:
9h and 0min - 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 3min - 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 3min
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 4min - Average sunshine in February:
5h and 2min - Average sunshine in March:
7h and 5min - Average sunshine in April:
10h and 3min - Average sunshine in May:
11h and 0min - Average sunshine in June:
11h and 4min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
12h and 1min - Average sunshine in September:
10h and 5min - Average sunshine in October:
6h and 4min - Average sunshine in November:
5h and 5min - Average sunshine in December:
4h and 5min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days
Rock Island, WA
- Average sunshine days in January:
14.5 days - Average sunshine days in February:
12.6 days - Average sunshine days in March:
13.5 days - Average sunshine days in April:
15.8 days - Average sunshine days in May:
18.1 days - Average sunshine days in June:
22.2 days
- Average sunshine days in July:
25.5 days - Average sunshine days in August:
25.4 days - Average sunshine days in September:
22.2 days - Average sunshine days in October:
18.5 days - Average sunshine days in November:
14.3 days - Average sunshine days in December:
15.7 days
The month with the most sunshine days is July (25.5 days).
The month with the least sunshine days is February (12.6 days).
Average UV index
Rock Island, WA
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
Rock Island, WA
The month with the most cloud cover is January (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility
Rock Island, WA
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (4mi).
Rock Island, Washington, USA
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