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
The arrival of April brings a change in Saint Johns's weather, with average high-temperatures moving from March's fresh 55°F (12.8°C) to a refreshing 66°F (18.9°C). Saint Johns experiences an average low-temperature reading of 48.4°F (9.1°C) throughout April.Humidity
In April, the average relative humidity in Saint Johns is 77%.Rainfall
The month with the most rainfall in Saint Johns, Illinois, is April, when the rain falls for 15.1 days and typically aggregates up to 3.58" (91mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. April is the last month it regularly snows in Saint Johns, Illinois. During 0.5 snowfall days, in April, Saint Johns aggregates 0.08" (2mm) of snow. In Saint Johns, during the entire year, snow falls for 18 days and aggregates up to 4.53" (115mm) of snow.Daylight
In Saint Johns, Illinois, the average length of the day in April is 13h and 13min.On the first day of the month, sunrise is at 6:40 am and sunset at 7:20 pm. On the last day of April, in Saint Johns, sunrise is at 6:00 am and sunset at 7:47 pm CDT.
Sunshine
In Saint Johns, the average sunshine in April is 8.5h.UV index
In April, the average daily maximum UV index in Saint Johns is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The daily maximum UV index of 4 in April interprets into the following advice:
Act with care - The suggestion to avoid sunburn is emphasized. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Frequently asked questions
What are the temperatures in Saint Johns in April?
What is the average humidity in April in Saint Johns?
What is the rainiest month in Saint Johns?
How many days does it rain in April in Saint Johns?
What is the last month it snows in Saint Johns?
How many hours of daylight does Saint Johns have in April?
What time are sunrise and sunset in April in Saint Johns?
How long on average sun shines in April in Saint Johns?
How high is the UV index in April in Saint Johns?
Average temperature in April
Saint Johns, IL
- Average high temperature in April: 66°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (38.8°F).
- Average low temperature in April: 48.4°F
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in April
Saint Johns, IL
- Average pressure in April: 29.95"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in April
Saint Johns, IL
- Average wind speed in April: 9.3mph
The windiest months (with the highest average wind speed) are January and February (9.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in April
Saint Johns, IL
- Average humidity in April: 77%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in April
Saint Johns, IL
- Average rainfall in April: 3.58"
The wettest month (with the highest rainfall) is April (3.58").
The driest month (with the least rainfall) is January (1.5").
Average rainfall days in April
Saint Johns, IL
- Average rainfall days in April: 15.1 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is December (8.2 days).
Average snowfall in April
Saint Johns, IL
- Average snowfall in April: 0.08"
The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in April
Saint Johns, IL
- Average snowfall days in April: 0.5 days
The month with the highest number of snowfall days is January (5.4 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
Saint Johns, IL
- Average daylight in April: 13h and 1min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in April: 8h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in April
Saint Johns, IL
- Average sunshine days in April: 12.4 days
The months with the most sunshine days are October and November (19.5 days).
The month with the least sunshine days is May (11.4 days).
Average UV index in April
Saint Johns, IL
- Average UV index in April: 4
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, November and December (UV index 2).
Average cloud cover in April
Saint Johns, IL
- Average cloud cover in April: 42
The months with the most cloud cover are January and February (Cloud cover 50).
The month with the least cloud cover is June (Cloud cover 28).
Average visibility in April
Saint Johns, 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).
Saint Johns, Illinois, USA
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