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
The start of October signals a decrease in the average high-temperature, transitioning from a warm 75.6°F (24.2°C) in September to a comfortable 62.1°F (16.7°C). In Merna, October nights witness a steady temperature drop to a chilly 46.6°F (8.1°C).Humidity
October is the least humid month in Merna, with an average relative humidity of 71%.Rainfall
In October, the rain falls for 12.2 days. Throughout October, 2.76" (70mm) of precipitation is accumulated. Throughout the year, there are 163.1 rainfall days, and 33.62" (854mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. October is the first month it typically snows. Throughout October, in the average 0.4 snowfall days, it receives 0.12" (3mm) of snow. In Merna, during the entire year, snow falls for 40.7 days and aggregates up to 17.01" (432mm) of snow.Daylight
The average length of the day in October is 11h and 7min.On the first day of October in Merna, Illinois, sunrise is at 6:52 am and sunset at 6:36 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:52 pm CDT.
Sunshine
The average sunshine in October in Merna is 5.8h.UV index
January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Merna. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In October, the maximum UV index of 2 suggests this advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average October temperature in Merna?
What is the least humid month in Merna?
What is the average humidity in October in Merna?
How much does it rain in Merna in October?
When does it start to snow in Merna?
How many hours of daylight does Merna have in October?
What time are sunrise and sunset in October in Merna?
How long on average sun shines in October in Merna?
When is the lowest UV index in Merna?
What is the UV index reading in October in Merna?
Average temperature in October
Merna, IL
- Average high temperature in October: 62.1°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (30.7°F).
- Average low temperature in October: 46.6°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in October
Merna, IL
- Average pressure in October: 30.02"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in October
Merna, IL
- Average wind speed in October: 9.9mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in October
Merna, IL
- Average humidity in October: 71%
The month with the highest relative humidity is July (86%).
The month with the lowest relative humidity is October (71%).
Average rainfall in October
Merna, IL
- Average rainfall in October: 2.76"
The wettest month (with the highest rainfall) is May (4.57").
The driest month (with the least rainfall) is December (1.93").
Average rainfall days in October
Merna, IL
- Average rainfall days in October: 12.2 days
The month with the highest number of rainy days is May (20.1 days).
The month with the least rainy days is February (6.9 days).
Average snowfall in October
Merna, IL
- Average snowfall in October: 0.12"
The month with the highest snowfall is January (5.04").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in October
Merna, IL
- Average snowfall days in October: 0.4 days
The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in October /
Average sunshine in October
Merna, IL
- Average daylight in October: 11h and 1min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in October: 5h and 5min
The month with the most sunshine is June (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in October
Merna, IL
- Average sunshine days in October: 16.4 days
The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is May (8.4 days).
Average UV index in October
Merna, IL
- Average UV index in October: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in October
Merna, IL
- Average cloud cover in October: 39
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 33).
Average visibility in October
Merna, IL
- Average visibility in October: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Merna, Illinois, USA
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