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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 Riley, Oregon, is a wintry winter month, with an average temperature varying between 22.3°F (-5.4°C) and 34.9°F (1.6°C). Riley sees the arrival of January with an average high-temperature of a still wintry 34.9°F (1.6°C), indicating a subtle variation from December. Weather in January »
Weather in February
February, the last month of the winter in Riley, is also a wintry month, with temperature in the range of an average high of 37.4°F (3°C) and an average low of 24.6°F (-4.1°C). As Riley transitions into February, the average high-temperature stands at a still icy 37.4°F (3°C), offering little variation from the preceding month. Weather in February »
Weather in March
March, the first month of the spring in Riley, is a chilly month, with temperature in the range of an average high of 44.8°F (7.1°C) and an average low of 30.6°F (-0.8°C). As March sets, the average high-temperature shows a slight increase, moving up from a cold 37.4°F (3°C) in February to a frosty 44.8°F (7.1°C). Weather in March »
Weather in April
April is a cool spring month in Riley, Oregon, with an average temperature ranging between max 52.2°F (11.2°C) and min 34.3°F (1.3°C). Observing a slight rise in April, the average high-temperature shifts from March's chilly 44.8°F (7.1°C) to a cool 52.2°F (11.2°C). Weather in April »
Weather in May
The last month of the spring, May, is a refreshing month in Riley, Oregon, with temperature in the range of an average low of 42.1°F (5.6°C) and an average high of 62.4°F (16.9°C). May's onset is marked by a temperature increase, moving from a fresh 52.2°F (11.2°C) in April to a refreshing 62.4°F (16.9°C). Weather in May »
Weather in June
The first month of the summer, June, is an agreeable month in Riley, Oregon, with an average temperature varying between 71.2°F (21.8°C) and 48.7°F (9.3°C). Riley's transition into June brings a slight rise in the average high-temperature, moving from a refreshing 62.4°F (16.9°C) in May to a pleasant 71.2°F (21.8°C). Weather in June »
Weather in July
July is a warm summer month in Riley, Oregon, with an average temperature varying between 82.9°F (28.3°C) and 57.4°F (14.1°C). Riley's warmest month, July, generally records average temperatures ranging from a high of 82.9°F (28.3°C) to a low of 57.4°F (14.1°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Riley, Oregon, with an average temperature fluctuating between 58.1°F (14.5°C) and 81.9°F (27.7°C). The advent of August brings an average high-temperature of a still warm 81.9°F (27.7°C), almost identical to the preceding month. Weather in August »
Weather in September
September, the first month of the autumn in Riley, is also an agreeable month, with temperature in the range of an average high of 72.3°F (22.4°C) and an average low of 51.1°F (10.6°C). The commencement of September indicates a shift in the average high-temperature, receding from August's moderately hot 81.9°F (27.7°C) to an agreeable 72.3°F (22.4°C). Weather in September »
Weather in October
October, the same as September, in Riley, Oregon, is a moderate autumn month, with an average temperature ranging between min 39.4°F (4.1°C) and max 56.7°F (13.7°C). In Riley, the average high-temperature in October drops, from a pleasant 72.3°F (22.4°C) in September, to a moderate 56.7°F (13.7°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Riley, Oregon, with an average temperature ranging between max 43.5°F (6.4°C) and min 29.3°F (-1.5°C). The arrival of November corresponds with a shift in temperature, down from a refreshing 56.7°F (13.7°C) in October to a chilly 43.5°F (6.4°C). Weather in November »
Weather in December
December, the first month of the winter in Riley, is still a cold month, with temperature in the range of an average low of 21.2°F (-6°C) and an average high of 33.1°F (0.6°C). In Riley, the month of December registers the lowest temperatures, averaging 33.1°F (0.6°C) at the peak and 21.2°F (-6°C) at the lowest. Weather in December »
[Resources]Frequently asked questions
How much does it rain in Riley?
Throughout the year, in Riley, Oregon, there are 125.1 rainfall days, and 11.26" (286mm) of precipitation is accumulated.
When does it snow in Riley?
Months with snowfall are January through March, November and December.
How much does it snow in Riley?
In Riley, during the entire year, snow falls for 8.6 days and aggregates up to 1.97" (50mm) of snow.
What are the months with the lowest UV index in Riley?
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.
When is Daylight Saving Time (DST) in Riley?
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 Riley?
April through October are months without snowfall in Riley, Oregon.
When are the longest days in Riley?
June has the longest days of the year, with an average of 15h and 24min of daylight.
What is the warmest month in Riley?
The temperatures in Riley reach their highest averages in July, with highs of 82.9°F (28.3°C) and lows of 57.4°F (14.1°C).
What are the least humid months in Riley?
July and August, with an average relative humidity of 33%, are the least humid months in Riley, Oregon.
What is the driest month in Riley?
The month with the least rainfall in Riley, Oregon, is July, when the rain falls for 3.7 days and typically collects 0.16" (4mm) of precipitation.
What month has the most sunshine in Riley?
The month with the most sunshine in Riley is July, with an average of 12.1h of sunshine.
When is the highest UV index in Riley?
With an average maximum UV index of 7, July is the month with the highest UV index.
What is the coldest month in Riley?
The coldest time of the year in Riley, Oregon, is December, with temperatures averaging a high of 33.1°F (0.6°C) and a low of 21.2°F (-6°C).
What is the most humid month in Riley?
December is the most humid month, with an average relative humidity of 83%.
What is the wettest month in Riley?
December is the month with the most rainfall. Rain falls for 13.6 days and accumulates 1.54" (39mm) of precipitation.
What is the snowiest month in Riley?
December is the month with the most snowfall in Riley, Oregon. Snow falls for 3.1 days and accumulates 0.87" (22mm) of snow.
What is the month with the shortest days in Riley?
December has the shortest days of the year in Riley, with an average of 9h and 0min of daylight.
What is the month with the least sunshine in Riley?
The month with the least sunshine is December, with an average of 5.2h of sunshine.
Average temperature
Riley, OR
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is December (33.1°F).
The month with the highest average low temperature is August (58.1°F).
The coldest month (with the lowest average low temperature) is December (21.2°F).
Average pressure
Riley, OR
- Average pressure in January:
30.22"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.04"Hg - Average pressure in April:
30.02"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.95"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.94"Hg - Average pressure in September:
29.98"Hg - Average pressure in October:
30.06"Hg - Average pressure in November:
30.12"Hg - Average pressure in December:
30.19"Hg
The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is August (29.94"Hg).
Average wind speed
Riley, OR
- Average wind speed in January:
7.7mph - Average wind speed in February:
8.9mph - Average wind speed in March:
9.8mph - Average wind speed in April:
9.9mph - Average wind speed in May:
9.3mph - Average wind speed in June:
8.9mph
- Average wind speed in July:
7.8mph - Average wind speed in August:
7.5mph - Average wind speed in September:
7.6mph - Average wind speed in October:
8mph - Average wind speed in November:
8.5mph - Average wind speed in December:
7.9mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (7.5mph).
Average humidity
Riley, OR
The month with the highest relative humidity is December (83%).
The months with the lowest relative humidity are July and August (33%).
Average rainfall
Riley, OR
- Average rainfall in January:
1.46" - Average rainfall in February:
1.3" - Average rainfall in March:
1.38" - Average rainfall in April:
1.3" - Average rainfall in May:
1.02" - Average rainfall in June:
0.71"
- Average rainfall in July:
0.16" - Average rainfall in August:
0.2" - Average rainfall in September:
0.47" - Average rainfall in October:
0.75" - Average rainfall in November:
0.98" - Average rainfall in December:
1.54"
The wettest month (with the highest rainfall) is December (1.54").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days
Riley, OR
- Average rainfall days in January:
12.8 days - Average rainfall days in February:
14.3 days - Average rainfall days in March:
17.7 days - Average rainfall days in April:
14.4 days - Average rainfall days in May:
11.9 days - Average rainfall days in June:
7.9 days
- Average rainfall days in July:
3.7 days - Average rainfall days in August:
3.3 days - Average rainfall days in September:
5.2 days - Average rainfall days in October:
9.2 days - Average rainfall days in November:
11.1 days - Average rainfall days in December:
13.6 days
The month with the highest number of rainy days is March (17.7 days).
The month with the least rainy days is August (3.3 days).
Average snowfall
Riley, OR
The month with the highest snowfall is December (0.87").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Riley, OR
- Average snowfall days in January:
2 days - Average snowfall days in February:
2.3 days - Average snowfall days in March:
0.5 days - Average snowfall days in April:
0 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:
3.1 days
The month with the highest number of snowfall days is December (3.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Riley, OR
- Average daylight in January:
9h and 2min - Average daylight in February:
10h and 3min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 3min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 2min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 4min - Average daylight in December:
9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in January:
5h and 2min - Average sunshine in February:
5h and 2min - Average sunshine in March:
7h and 3min - Average sunshine in April:
10h and 1min - Average sunshine in May:
11h and 0min - Average sunshine in June:
11h and 3min
- Average sunshine in July:
12h and 1min - Average sunshine in August:
11h and 5min - Average sunshine in September:
10h and 5min - Average sunshine in October:
7h and 1min - Average sunshine in November:
6h and 2min - Average sunshine in December:
5h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).
Average sunshine days
Riley, OR
- Average sunshine days in January:
15.7 days - Average sunshine days in February:
12.1 days - Average sunshine days in March:
11.5 days - Average sunshine days in April:
13.3 days - Average sunshine days in May:
16.5 days - Average sunshine days in June:
20.3 days
- Average sunshine days in July:
25.3 days - Average sunshine days in August:
25.3 days - Average sunshine days in September:
22.9 days - Average sunshine days in October:
20 days - Average sunshine days in November:
16.1 days - Average sunshine days in December:
14.5 days
The months with the most sunshine days are July and August (25.3 days).
The month with the least sunshine days is March (11.5 days).
Average UV index
Riley, OR
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover
Riley, OR
The month with the most cloud cover is December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility
Riley, OR
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).
Riley, Oregon, USA
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