Contents
- Weather in October
- Frequently asked questions
- Average temperature in October
- Average pressure in October
- Average wind speed in October
- Average humidity in October
- Average rainfall in October
- Average rainfall days in October
- Average snowfall in October
- Average snowfall days in October
- Average daylight in October
- Average sunshine in October
- Average sunshine days in October
- Average UV index in October
- Average cloud cover in October
- Average visibility in October
Weather in October
Temperature
As September gives way to October, the average high-temperature displays a considerable decrease, falling from an agreeable 72.7°F (22.6°C) to a refreshing 56.3°F (13.5°C). October nights are marked by an average low-temperature of 41.4°F (5.2°C).Humidity
In October, the average relative humidity in Grand Coulee is 63%.Rainfall
In Grand Coulee, in October, during 10.3 rainfall days, 0.87" (22mm) of precipitation is typically accumulated. In Grand Coulee, during the entire year, the rain falls for 102.1 days and collects up to 9.65" (245mm) of precipitation.Snowfall
Months with snowfall in Grand Coulee are January through April, September through December. In Grand Coulee, during October, snow falls for 0.2 days and regularly aggregates up to 0.04" (1mm) of snow. In Grand Coulee, during the entire year, snow falls for 33.4 days and aggregates up to 14.65" (372mm) of snow.Daylight
In Grand Coulee, the average length of the day in October is 10h and 49min.On the first day of the month, sunrise is at 6:56 am and sunset at 6:34 pm. On the last day of October, sunrise is at 7:40 am and sunset at 5:38 pm PDT.
Sunshine
The average sunshine in October is 6.7h.UV index
In Grand Coulee, Washington, the average daily maximum UV index in October is 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the average person.Note: In October, a daily UV index of 2 turns into the following recommendations:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Frequently asked questions
What is the temperature in October in Grand Coulee?
What is the average humidity in October in Grand Coulee?
How much does it rain in Grand Coulee in October?
How many days does it snow in October in Grand Coulee?
What is the average length of the day in October in Grand Coulee?
When are sunrise and sunset in October in Grand Coulee?
How long on average sun shines in October in Grand Coulee?
What is the UV index intensity in October in Grand Coulee?
Average temperature in October
Grand Coulee, WA
- Average high temperature in October: 56.3°F
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is December (31.6°F).
- Average low temperature in October: 41.4°F
The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (21.4°F).
Average pressure in October
Grand Coulee, WA
- Average pressure in October: 30.03"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 in October
Grand Coulee, WA
- Average wind speed in October: 5.9mph
The windiest month (with the highest average wind speed) is April (7mph).
The calmest month (with the lowest average wind speed) is January (4.9mph).
Average humidity in October
Grand Coulee, WA
- Average humidity in October: 63%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (36%).
Average rainfall in October
Grand Coulee, WA
- Average rainfall in October: 0.87"
The wettest months (with the highest rainfall) are May and December (1.18").
The driest months (with the least rainfall) are July and August (0.2").
Average rainfall days in October
Grand Coulee, WA
- Average rainfall days in October: 10.3 days
The month with the highest number of rainy days is March (12.1 days).
The month with the least rainy days is August (3.2 days).
Average snowfall in October
Grand Coulee, WA
- Average snowfall in October: 0.04"
The month with the highest snowfall is January (4.41").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in October
Grand Coulee, WA
- Average snowfall days in October: 0.2 days
The month with the highest number of snowfall days is December (10.5 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in October /
Average sunshine in October
Grand Coulee, WA
- Average daylight in October: 10h and 5min
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 October: 6h and 4min
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 6min).
Average sunshine days in October
Grand Coulee, WA
- Average sunshine days in October: 19.2 days
The month with the most sunshine days is August (25.8 days).
The month with the least sunshine days is March (14.7 days).
Average UV index in October
Grand Coulee, WA
- Average UV index in October: 2
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in October
Grand Coulee, WA
- Average cloud cover in October: 31
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in October
Grand Coulee, WA
- Average visibility in October: 6mi
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).
Grand Coulee, Washington, USA
Weather forecast for your location
2. Allow the app to use your location
