Climate and monthly weather forecastRichland, WA
Climate and monthly weather forecast
The climate of Richland
Richland, Washington, falls into the BSk zone of the Köppen climate classification, matching the mid-latitude steppe predominant climate. This arid, flat region, typified by hot, dry summers and cold winters, does not see much rainfall throughout the year.Throughout the calendar year, the city's weather fluctuates with distinctive transitions between seasons. The average high temperature ranges between a chilly 38.1°F (3.4°C) in December to a hot 90.1°F (32.3°C) in July, while the low temperature swings from 27.5°F (-2.5°C) to 64.2°F (17.9°C) in the same months. A gradually increasing trend can be noticed from the first half to the middle of the year, with a subsequent decrease towards the year-end.
Richland's humidity varies quite noticeably too, starting from a high 81% in January, dropping to 35% in July, and then rising again towards December. Rainfall is sporadic, reaching its peak in January and December registering 0.91" (23mm) and 0.94" (24mm) respectively. Intriguingly, snowfall only occurs from January to March and in November and December, with February registering maximum snow at 2.2" (56mm).
The best time to visit Richland
Understanding the city's geographical location, climate particulars, and one's personal comfort with hot or cold temperature thresholds is crucial when planning to visit Richland. Considering all climatic parameters, the period from May to September seems to be the most favorable. This timeframe experiences warm temperatures ranging from 63.3°F (17.4°C) to 90.1°F (32.3°C), less rainfall (ranging from 0.47" (12mm) to 0.67" (17mm)), longer daylight hours, registering between 13.6 to 15.7 hours, and increased sunshine hours, reaching a high of 12.1 hours in July.The worst time to visit Richland
The months of January and December are likely to be the least conducive for travelers seeking to explore Richland. This period witnesses low temperatures, reaching 28.8°F (-1.8°C) in January and 27.5°F (-2.5°C) in December, combined with high rainfall, 0.91" (23mm) and 0.94" (24mm) respectively, and considerably fewer sunshine hours, amounting to 5.4 hours in January and 5.6 hours in December.Spring weather in Richland
The onset of spring in Richland, during the months from March to May, brings noticeable warmth after the cold winter months. High temperatures range from 54.7°F (12.6°C) to 73°F (22.8°C), while low temperatures improve from 37.9°F (3.3°C) to 50.7°F (10.4°C). Rainfall continues to steadily decrease from 0.87" (22mm) in March to 0.67" (17mm) in May. Relative humidity also drops from 64% in March to 48% in May, ensuring a less heavy atmosphere.Summer weather in Richland
Summers in Richland, from June to August, are characteristically hot and dry, with high temperatures reaching up to 90.1°F (32.3°C) in July. Nonetheless, the city maintains reasonably cool nights with temperatures as low as 56.7°F (13.7°C) in June to 64.2°F (17.9°C) in August. Rainfall diminishes substantially during this season, registering merely 0.2" (5mm) in July.Autumn weather in Richland
Autumn, spanning September to November, experiences gradually declining temperatures, with November seeing a high of 48.7°F (9.3°C) and a low of 36.3°F (2.4°C). Rainfall starts to increase again in October while light snow begins to appear towards the end of November.Winter weather in Richland
Winters, from December to February, are chilly in Richland. The high temperature plummets to 38.1°F (3.4°C) in December and temperatures at night drop as low as 27.5°F (-2.5°C) in the same month. This season also witnesses the highest rainfall across the year, escalating to 0.94" (24mm) in December. Also, snow lovers will appreciate the sight of the city under a light blanket of snow, with February receiving the highest snowfall at 2.2" (56mm).Weather in January
January exhibits a drop in temperature from 38.8°F (3.8°C) to 28.8°F (-1.8°C), signifying the start of crisp winter days in Richland, Washington. Heavy cloud cover and high humidity are prevalent, creating a bluish-gray sky. Weather in January »Weather in February
February in Richland is a transition period, with temperatures rising slightly, hinting at the approaching spring season. There's an anticipation of warmer days mixed with the residual chill of winter. Despite the increased cloud cover from the preceding month, it is a relatively dry month, with rainfall limited to 0.79" (20mm). Weather in February »Weather in March
March denotes the beginning of spring in Richland, with longer daylight hours. The weather becomes more pleasant, encouraging outdoor activities. Venturing out to enjoy the melting snow under the increasingly sunny sky becomes the town's motif. Weather in March »Weather in April
April sees a significant shift in Richland weather, with temperatures soaring, touching nearly 63.3°F (17.4°C) and lower humidity. The changing season is evident with the calendar flipping to April. Vibrant blossoms break the monotony of the dreary weather, painting the town in shades of pastels. Weather in April »Weather in May
May brings along mildly warm temperatures, creating the perfect conditions for spending time outdoors. Richland is bathed in nearly 15 hours of daylight every day during this month. The skies clear up substantially, allowing the sun to shine brightly upon the city. Weather in May »Weather in June
In June, Richland witnesses the onset of the warm summer season. The relatively cloud-free skies offer unobstructed sunlight during most days of the month. The high average temperature and reduced precipitation make it one of the driest months of the year. Weather in June »Weather in July
July stands out as the hottest month in Richland with temperatures soaring to a peak at 90.1°F (32.3°C). It marks the height of the summer season. Extended daylight hours, bright sunshine, and the lowest humidity level, create a sultry atmosphere. Weather in July »Weather in August
August continues the summer trend in Richland, with temperatures slightly falling from July but remaining relatively high. Inhabitants brace themselves for many sunny, hot days ahead. The weather conditions are characterized by minimal rainfall and clear skies. Weather in August »Weather in September
September brings a significant change in the climate of Richland as the autumn season kicks in. The temperatures begin to drop noticeably and the greenery starts turning rustic, indicating summer's end. The typically clear September skies are now interspersed with clouds. Weather in September »Weather in October
October stands as the herald of the fall season in Richland. It is characterized by shorter days, cooler temperatures, and the city turning into a picturesque canvas of oranges, browns, and yellows. The rainfall amount increases, reaching 0.63" (16mm), leaving a refreshing aroma in the air post showers. Weather in October »Weather in November
November is marked by a considerable drop in temperature in Richland, a precursor to the upcoming winter. The atmosphere takes on a characteristic winter chill with increased humidity and rainfall. Affected by cold winds touching 6.5mph (10.5km/h), the city prepares to usher in the snow season. Weather in November »Weather in December
December in Richland signifies the full swing of winter. Temperatures drop significantly, making the city truly experience cold winter weather. The increased rainfall, measuring up to 0.94" (24mm), and the reemerging snowfall add to the white wintry view. Weather in December »Updated: Aug 30, 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 is the most humid month, with an average relative humidity of 81%.
Throughout the year, there are 100.2 rainfall days, and 7.05" (179mm) of precipitation is accumulated.
January through March, November and December are months with snowfall.
In Richland, during the entire year, snow falls for 10.4 days and aggregates up to 5.35" (136mm) of snow.
January has the least sunshine of the year, with an average of 5.4h of sunshine.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
The month with the most snowfall is February, when snow falls for 2.9 days and typically aggregates up to 2.2" (56mm) 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.
In Richland, snow does not fall in April through October.
With an average of 15h and 42min of daylight, June has the longest days of the year.
In Richland, the peak average temperatures are observed in July, with a high of 90.1°F (32.3°C) and a low of 62.8°F (17.1°C).
With an average relative humidity of 35%, July is the least humid month in Richland, Washington.
The months with the least rainfall are July and September Rain falls for 3.5 days and accumulates 0.2" (5mm) of rain.
With an average of 12.1h of sunshine, July has the most sunshine of the year.
With an average maximum UV index of 7, July is the month with the highest UV index.
With average high and low temperatures of 38.1°F (3.4°C) and 27.5°F (-2.5°C) respectively, December is Richland's coldest month.
December is the month with the most rainfall. Rain falls for 10.3 days and accumulates 0.94" (24mm) of precipitation.
December has the shortest days of the year, with an average of 8h and 42min of daylight.
Average temperature
Richland, WA
The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is December (38.1°F).
The month with the highest average low temperature is August (64.2°F).
The coldest month (with the lowest average low temperature) is December (27.5°F).
Average pressure
Richland, WA
- Average pressure in January:
30.18"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
29.99"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.91"Hg - Average pressure in September:
29.95"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.16"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed
Richland, WA
- Average wind speed in January:
6mph - Average wind speed in February:
6.7mph - Average wind speed in March:
8mph - Average wind speed in April:
8.3mph - Average wind speed in May:
7.3mph - Average wind speed in June:
7.5mph
- Average wind speed in July:
6.5mph - Average wind speed in August:
6.2mph - Average wind speed in September:
6.6mph - Average wind speed in October:
6.5mph - Average wind speed in November:
6.5mph - Average wind speed in December:
5.6mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is December (5.6mph).
Average humidity
Richland, WA
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is July (35%).
Average rainfall
Richland, WA
- Average rainfall in January:
0.91" - Average rainfall in February:
0.79" - Average rainfall in March:
0.87" - Average rainfall in April:
0.51" - Average rainfall in May:
0.67" - Average rainfall in June:
0.47"
The wettest month (with the highest rainfall) is December (0.94").
The driest months (with the least rainfall) are July and September (0.2").
Average rainfall days
Richland, WA
- Average rainfall days in January:
10.9 days - Average rainfall days in February:
9 days - Average rainfall days in March:
12.3 days - Average rainfall days in April:
9.9 days - Average rainfall days in May:
8.8 days - Average rainfall days in June:
6.6 days
- Average rainfall days in July:
3.5 days - Average rainfall days in August:
4.3 days - Average rainfall days in September:
4 days - Average rainfall days in October:
10 days - Average rainfall days in November:
10.6 days - Average rainfall days in December:
10.3 days
The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is July (3.5 days).
Average snowfall
Richland, WA
The month with the highest snowfall is February (2.2").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Richland, WA
- Average snowfall days in January:
2.5 days - Average snowfall days in February:
2.9 days - Average snowfall days in March:
0.8 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:
0.9 days - Average snowfall days in December:
3.3 days
The month with the highest number of snowfall days is December (3.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Richland, WA
- Average daylight in January:
9h and 6min - Average daylight in February:
10h and 24min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 36min - Average daylight in May:
15h and 0min - Average daylight in June:
15h and 42min
- Average daylight in July:
15h and 24min - Average daylight in August:
14h and 6min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 54min - Average daylight in November:
9h and 24min - Average daylight in December:
8h and 42min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in January:
5h and 24min - Average sunshine in February:
5h and 48min - Average sunshine in March:
7h and 48min - Average sunshine in April:
10h and 12min - Average sunshine in May:
11h and 6min - Average sunshine in June:
11h and 30min
- Average sunshine in July:
12h and 6min - Average sunshine in August:
12h and 0min - Average sunshine in September:
10h and 54min - Average sunshine in October:
6h and 54min - Average sunshine in November:
6h and 18min - Average sunshine in December:
5h and 36min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days
Richland, WA
- Average sunshine days in January:
16.2 days - Average sunshine days in February:
15.3 days - Average sunshine days in March:
15.3 days - Average sunshine days in April:
17 days - Average sunshine days in May:
19.8 days - Average sunshine days in June:
22.3 days
- Average sunshine days in July:
25.7 days - Average sunshine days in August:
24.1 days - Average sunshine days in September:
24.2 days - Average sunshine days in October:
19.4 days - Average sunshine days in November:
16.6 days - Average sunshine days in December:
16.6 days
The month with the most sunshine days is July (25.7 days).
The months with the least sunshine days are February and March (15.3 days).
Average UV index
Richland, WA
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Richland, WA
The month with the most cloud cover is January (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility
Richland, WA
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
