Contents
- Weather in April
- Frequently asked questions
- Average temperature in April
- Average pressure in April
- Average wind speed in April
- Average humidity in April
- Average rainfall in April
- Average rainfall days in April
- Average snowfall in April
- Average snowfall days in April
- Average daylight in April
- Average sunshine in April
- Average sunshine days in April
- Average UV index in April
- Average cloud cover in April
- Average visibility in April
Weather in April
Temperature
April's onset brings a temperature rise, moving from a cool 53.6°F (12°C) in March to a refreshing 64.9°F (18.3°C). In April, the average low-temperature records at a frosty 47.1°F (8.4°C) during the nights.Humidity
In April, the average relative humidity in Grafton is 75%.Rainfall
In April, the rain falls for 13.7 days. Throughout April, 3.11" (79mm) of precipitation is accumulated. In Grafton, Illinois, during the entire year, the rain falls for 138.8 days and collects up to 27.6" (701mm) of precipitation.Snowfall
In Grafton, Illinois, snow does not fall in April through October.Daylight
In April, the average length of the day in Grafton is 13h and 15min.On the first day of April in Grafton, sunrise is at 6:44 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:03 am and sunset at 7:53 pm CDT.
Sunshine
In April, the average sunshine in Grafton is 8.5h.UV index
In Grafton, the average daily maximum UV index in April is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The UV index of 5 during April leads to these advisories:
Heed the precautions - Suggestions to avoid sunburn are made. Around midday, solar radiation is most harmful; hence, exposure should be limited. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Grafton in April?
What is the average humidity in April in Grafton?
How much does it rain in Grafton in April?
When it does not snow in Grafton?
Does it snow in Grafton in April?
What is the average length of the day in April in Grafton?
What time are sunrise and sunset in April in Grafton?
How long on average sun shines in April in Grafton?
What is the UV index intensity in April in Grafton?
Average temperature in April
Grafton, IL
- Average high temperature in April: 64.9°F
The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in April: 47.1°F
The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in April
Grafton, IL
- Average pressure in April: 29.93"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in April
Grafton, IL
- Average wind speed in April: 9.1mph
The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).
Average humidity in April
Grafton, IL
- Average humidity in April: 75%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in April
Grafton, IL
- Average rainfall in April: 3.11"
The wettest month (with the highest rainfall) is May (3.35").
The driest month (with the least rainfall) is February (1.3").
Average rainfall days in April
Grafton, IL
- Average rainfall days in April: 13.7 days
The month with the highest number of rainy days is July (16.3 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in April
Grafton, IL
- Average snowfall in April: 0"
The months with the highest snowfall are January and February (1.54").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in April
Grafton, IL
- Average snowfall days in April: 0.3 days
The month with the highest number of snowfall days is January (5.7 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
Grafton, IL
- Average daylight in April: 13h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in April: 8h and 3min
The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).
Average sunshine days in April
Grafton, IL
- Average sunshine days in April: 15 days
The month with the most sunshine days is December (19.8 days).
The month with the least sunshine days is June (11.2 days).
Average UV index in April
Grafton, IL
- Average UV index in April: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in April
Grafton, IL
- Average cloud cover in April: 42
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in April
Grafton, IL
- Average visibility in April: 6mi
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).
Grafton, Illinois, USA
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