June weather forecastJohnston, IA
June
Weather in June
June in Johnston signifies the arrival of summer with sun-soaked daylight and temperatures nudging towards the high range. While the rain eases a bit from the previous month, humidity begins to rise, creating a relatively warm but bearable atmosphere. These humid conditions along with relatively strong sunlight, allow for intriguing weather phenomena. Residents and tourists alike embrace the warmth, indulging in various outdoor activities that define Johnston’s summers, such as fishing and boating.Temperature
With the onset of June, the average high-temperature slightly shifts from May's agreeable 69.6°F (20.9°C) to a warm 79.3°F (26.3°C). Throughout June, the nighttime temperature averages to a refreshing 62.4°F (16.9°C).Humidity
In June, the average relative humidity is 81%.Rainfall
The months with the most rainfall are May and June, with an average 2.52" (64mm) of precipitation.Snowfall
In Johnston, snow does not fall in June through September.Daylight
With an average of 15h and 12min of daylight, June has the longest days of the year.On the first day of the month, sunrise is at 5:42 am and sunset at 8:43 pm. On the last day of June, in Johnston, sunrise is at 5:44 am and sunset at 8:53 pm CDT.
Sunshine
The average sunshine in June is 9.8h.UV index
The months with the highest UV index are June and July, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for ordinary individuals.Note: In June, the maximum UV index of 6 suggests these recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in June
Johnston, IA
- Average high temperature in June: 79.3°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in June: 62.4°F
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (14.4°F).
Average pressure in June
Johnston, IA
- Average pressure in June: 29.88"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in June
Johnston, IA
- Average wind speed in June: 8mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in June
Johnston, IA
- Average humidity in June: 81%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (70%).
Average rainfall in June
Johnston, IA
- Average rainfall in June: 2.52"
The wettest months (with the highest rainfall) are May and June (2.52").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in June
Johnston, IA
- Average rainfall days in June: 15.8 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (3.5 days).
Average snowfall in June
Johnston, IA
- Average snowfall in June: 0"
The month with the highest snowfall is January (2.2").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in June
Johnston, IA
- Average snowfall days in June: 0 days
The month with the highest number of snowfall days is January (8.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in June /
Average sunshine in June
Johnston, IA
- Average daylight in June: 15h and 12min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in June: 9h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in June
Johnston, IA
- Average sunshine days in June: 11.2 days
The month with the most sunshine days is December (22.8 days).
The month with the least sunshine days is June (11.2 days).
Average UV index in June
Johnston, IA
- Average UV index in June: 6
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in June
Johnston, IA
- Average cloud cover in June: 34
The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is September (Cloud cover 28).
Average visibility in June
Johnston, IA
- Average visibility in June: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
