Contents
- Weather in June
- Frequently asked questions
- Average temperature in June
- Average pressure in June
- Average wind speed in June
- Average humidity in June
- Average rainfall in June
- Average rainfall days in June
- Average snowfall in June
- Average snowfall days in June
- Average daylight in June
- Average sunshine in June
- Average sunshine days in June
- Average UV index in June
- Average cloud cover in June
- Average visibility in June
Weather in June
Temperature
The shift from May to June introduces a subtle increase in the average high-temperature, moving from a warm 81.1°F (27.3°C) to a tropical 88.7°F (31.5°C). Throughout the month of June, the average temperature dips to a pleasant 69.4°F (20.8°C) at night.Heat index
In June, the average heat index is calculated to be a very hot 102.2°F (39°C). Incorporate special precautions, risk of heat exhaustion and heat cramps is substantial. Sustained activity could cause heatstroke.Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
One of the main methods the human body employs to cool down is by perspiring, as this process allows sweat to evaporate and remove excess heat. When air moisture content is high, the cooling process through evaporation is not as efficient, leading to an ineffective body cooling process and a feeling of overheating. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.
Humidity
In Johnston, the average relative humidity in June is 71%.Rainfall
In Johnston, in June, it is raining for 14.8 days, with typically 2.17" (55mm) of accumulated precipitation. Throughout the year, in Johnston, there are 149.8 rainfall days, and 28.58" (726mm) of precipitation is accumulated.Snowfall
In Johnston, snow does not fall in April through November.Daylight
June has the longest days of the year, with an average of 14h and 24min of daylight.On the first day of June, sunrise is at 6:17 am and sunset at 8:33 pm. On the last day of the month, sunrise is at 6:19 am and sunset at 8:42 pm EDT.
Sunshine
June and July, with an average of 10.9h of sunshine, are months with the most sunshine.UV index
June through August, with an average maximum UV index of 7, are months with the highest UV index in Johnston. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: The daily high UV index of 7 during June translates into the following recommendations:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in June?
What is the average humidity in June?
How much does it rain in June?
When it does not snow?
When are the longest days?
What is the average length of the day in June?
When is the sunrise / sunset in June?
What is the month with the most sunshine in Johnston?
How many hours of sunshine does Johnston have in June?
What are the months with the highest UV index?
How high is the UV index in June?
Average temperature in June
Johnston, SC
- Average high temperature in June: 88.7°F
The warmest month (with the highest average high temperature) is July (91.4°F).
The month with the lowest average high temperature is January (52.7°F).
- Average low temperature in June: 69.4°F
The month with the highest average low temperature is July (72.5°F).
The coldest month (with the lowest average low temperature) is January (36.9°F).
Average pressure in June
Johnston, SC
- Average pressure in June: 29.98"Hg
The months with the highest atmospheric pressure are January, November and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in June
Johnston, SC
- Average wind speed in June: 5.9mph
The windiest months (with the highest average wind speed) are February and April (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in June
Johnston, SC
- Average humidity in June: 71%
The month with the highest relative humidity is December (76%).
The month with the lowest relative humidity is July (70%).
Average rainfall in June
Johnston, SC
- Average rainfall in June: 2.17"
The wettest month (with the highest rainfall) is December (3.03").
The driest month (with the least rainfall) is September (1.42").
Average rainfall days in June
Johnston, SC
- Average rainfall days in June: 14.8 days
The month with the highest number of rainy days is July (17.5 days).
The month with the least rainy days is November (7.8 days).
Average snowfall in June
Johnston, SC
- Average snowfall in June: 0"
The month with the highest snowfall is February (0.59").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in June
Johnston, SC
- Average snowfall days in June: 0 days
The months with the highest number of snowfall days are January and February (0.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in June /
Average sunshine in June
Johnston, SC
- Average daylight in June: 14h and 2min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in June: 10h and 5min
The months with the most sunshine are June and July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in June
Johnston, SC
- Average sunshine days in June: 12.8 days
The month with the most sunshine days is October (21.8 days).
The month with the least sunshine days is July (11.2 days).
Average UV index in June
Johnston, SC
- Average UV index in June: 7
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in June
Johnston, SC
- Average cloud cover in June: 28
The month with the most cloud cover is December (Cloud cover 41).
The month with the least cloud cover is October (Cloud cover 27).
Average visibility in June
Johnston, SC
- Average visibility in June: 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).
Johnston, South Carolina, USA
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