April weather forecastOttawa, IL
April
Weather in April
April is a mild spring month in Ottawa, Illinois, with temperature in the range of an average high of 58.8°F (14.9°C) and an average low of 42.4°F (5.8°C).Temperature
Ottawa's weather in April shows a rise in the average high-temperature, moving up from March's frosty 46.9°F (8.3°C) to a mild 58.8°F (14.9°C). Nighttime temperature experiences an average drop to a wintry 42.4°F (5.8°C) in April.Humidity
The average relative humidity in April is 74%.Rainfall
In Ottawa, during April, the rain falls for 17.6 days and regularly aggregates up to 4.25" (108mm) of precipitation. In Ottawa, during the entire year, the rain falls for 166.3 days and collects up to 35.35" (898mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. April is the last month it regularly snows. During 1.7 snowfall days, in April, Ottawa aggregates 1.93" (49mm) of snow. In Ottawa, during the entire year, snow falls for 43.4 days and aggregates up to 17.76" (451mm) of snow.Daylight
In April, the average length of the day is 13h and 21min.On the first day of April, sunrise is at 6:37 am and sunset at 7:21 pm. On the last day of the month, sunrise is at 5:52 am and sunset at 7:52 pm CDT.
Sunshine
In April, the average sunshine is 7.8h.UV index
The average daily maximum UV index in April in Ottawa is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: In April, the average maximum UV index of 3 translates into the following recommendations:
Ensure safety - Sun damage prevention is strongly urged. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Ottawa, IL
- Average high temperature in April: 58.8°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (29.1°F).
- Average low temperature in April: 42.4°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (17.2°F).
Average pressure in April
Ottawa, IL
- Average pressure in April: 29.94"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in April
Ottawa, IL
- Average wind speed in April: 10.2mph
The windiest month (with the highest average wind speed) is April (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in April
Ottawa, IL
- Average humidity in April: 74%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall in April
Ottawa, IL
- Average rainfall in April: 4.25"
The wettest month (with the highest rainfall) is May (5").
The driest month (with the least rainfall) is November (1.81").
Average rainfall days in April
Ottawa, IL
- Average rainfall days in April: 17.6 days
The month with the highest number of rainy days is July (19.9 days).
The month with the least rainy days is February (6.2 days).
Average snowfall in April
Ottawa, IL
- Average snowfall in April: 1.93"
The month with the highest snowfall is February (5.08").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in April
Ottawa, IL
- Average snowfall days in April: 1.7 days
The month with the highest number of snowfall days is January (12.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in April /
Average sunshine in April
Ottawa, IL
- Average daylight in April: 13h and 24min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in April: 7h and 48min
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 54min).
Average sunshine days in April
Ottawa, IL
- Average sunshine days in April: 9.8 days
The month with the most sunshine days is November (17 days).
The month with the least sunshine days is July (7.2 days).
Average UV index in April
Ottawa, IL
- Average UV index in April: 3
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in April
Ottawa, IL
- Average cloud cover in April: 48
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility in April
Ottawa, IL
- Average visibility in April: 6mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
