Expand
Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, the same as December, is another fresh winter month in Johnston, South Carolina, with an average temperature ranging between max 52.7°F (11.5°C) and min 36.9°F (2.7°C). The coldest period tends to be January, when average temperatures fluctuate between a high of 52.7°F (11.5°C) and a low of 36.9°F (2.7°C). Weather in January »
Weather in February
February, the last month of the winter in Johnston, is a mild month, with an average temperature fluctuating between 40.5°F (4.7°C) and 57°F (13.9°C). The advent of February denotes an average high-temperature of a moderate 57°F (13.9°C), subtly different from January's 52.7°F (11.5°C). Weather in February »
Weather in March
The first month of the spring, March, is an enjoyable month in Johnston, South Carolina, with an average temperature fluctuating between 64°F (17.8°C) and 46.2°F (7.9°C). As Johnston welcomes March, the average high-temperature sees a modest rise, transitioning from a mild 57°F (13.9°C) in February to a comfortable 64°F (17.8°C). Weather in March »
Weather in April
April is a warm spring month in Johnston, South Carolina, with an average temperature ranging between max 73.9°F (23.3°C) and min 54.9°F (12.7°C). April's arrival sees a rise in the average high-temperature, jumping from March's comfortable 64°F (17.8°C) to a moderately hot 73.9°F (23.3°C). Weather in April »
Weather in May
May, the last month of the spring in Johnston, is another warm month, with an average temperature ranging between min 62.2°F (16.8°C) and max 81.1°F (27.3°C). As Johnston, South Carolina, transitions into May, a marginal rise in the average high-temperature is observed, moving from 73.9°F (23.3°C) in April to a still warm 81.1°F (27.3°C). Weather in May »
Weather in June
The first month of the summer, June, is a tropical month in Johnston, South Carolina, with an average temperature ranging between max 88.7°F (31.5°C) and min 69.4°F (20.8°C). June marks a minor ascent in the average high-temperature, adjusting from May's moderately hot 81.1°F (27.3°C) to a tropical 88.7°F (31.5°C). Weather in June »
Weather in July
July, like June, is a hot summer month in Johnston, South Carolina, with an average temperature ranging between max 91.4°F (33°C) and min 72.5°F (22.5°C). July is the month when Johnston, South Carolina, experiences its warmest temperatures, averaging a high of 91.4°F (33°C) and a low of 72.5°F (22.5°C). In July, the average heat index is computed to be a scorching 109.4°F (43°C). Weather in July »
Weather in August
The last month of the summer, August, is another hot month in Johnston, South Carolina, with temperature in the range of an average low of 71.2°F (21.8°C) and an average high of 90.1°F (32.3°C). August brings an average high-temperature of a still hot 90.1°F (32.3°C), showing a slight difference from July's 91.4°F (33°C). Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Johnston, South Carolina, with an average temperature varying between 66.4°F (19.1°C) and 84.7°F (29.3°C). Entering September, Johnston's average high-temperature reads a moderately hot 84.7°F (29.3°C), indicating a close resemblance to the previous month's climate. Weather in September »
Weather in October
October, like September, in Johnston, South Carolina, is another warm autumn month, with an average temperature varying between 55.2°F (12.9°C) and 73.9°F (23.3°C). In October, the meteorological conditions alter, with the average high-temperature shifting from 84.7°F (29.3°C) in September to a still warm 73.9°F (23.3°C). Weather in October »
Weather in November
The last month of the autumn, November, is another comfortable month in Johnston, South Carolina, with an average temperature varying between 61.9°F (16.6°C) and 45.3°F (7.4°C). The transition into November is accompanied by a temperature decrease, with the average high-temperature shifting from a warm 73.9°F (23.3°C) in October to a comfortable 61.9°F (16.6°C). Weather in November »
Weather in December
December, the first month of the winter in Johnston, is also a moderate month, with an average temperature varying between 41.4°F (5.2°C) and 56.1°F (13.4°C). December brings a slight decrease in temperature, down from a comfortable 61.9°F (16.6°C) in November to a still refreshing 56.1°F (13.4°C). Weather in December »
[Resources]Frequently asked questions
What is the coldest time of year in Johnston?
Johnston's coldest weather arrives in January, when temperatures average a high of 52.7°F (11.5°C) and a low of 36.9°F (2.7°C).
How many days does it rain in Johnston?
In Johnston, during the entire year, the rain falls for 149.8 days and collects up to 28.58" (726mm) of precipitation.
When does it snow in Johnston?
January through March and December are months with snowfall.
How many days does it snow in Johnston?
In Johnston, during the entire year, snow falls for 1.2 days and aggregates up to 1.02" (26mm) of snow.
When is the lowest UV index in Johnston?
January is the month with the lowest UV index, with an average maximum UV index of 2.
What is the snowiest month in Johnston?
The month with the most snowfall is February, when snow falls for 0.4 days and typically aggregates up to 0.59" (15mm) of snow.
When is Daylight Saving Time (DST) in Johnston?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Johnston, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
When it does not snow in Johnston?
April through November are months without snowfall in Johnston, South Carolina.
When are the longest days in Johnston?
June has the longest days of the year, with an average of 14h and 24min of daylight.
What are the months with the most sunshine in Johnston?
June and July, with an average of 10.9h of sunshine, are months with the most sunshine.
When is the highest UV index in Johnston?
The months with the highest UV index in Johnston are June through August, with an average maximum UV index of 7.
What is the warmest month in Johnston?
July, with an average high of 91.4°F (33°C) and a low of 72.5°F (22.5°C), signifies the warmest month of the year in Johnston, South Carolina.
What is the least humid month in Johnston?
With an average relative humidity of 70%, July is the least humid month.
What is the driest month in Johnston?
September is the month with the least rainfall. Rain falls for 12.2 days and accumulates 1.42" (36mm) of precipitation.
What is the most humid month in Johnston?
The most humid month is December, with an average relative humidity of 76%.
What is the rainiest month in Johnston?
The month with the most rainfall in Johnston is December, when the rain falls for 11.2 days and typically aggregates up to 3.03" (77mm) of precipitation.
What is the month with the shortest days in Johnston?
December has the shortest days of the year in Johnston, South Carolina, with an average of 9h and 54min of daylight.
What is the month with the least sunshine in Johnston?
December has the least sunshine of the year, with an average of 5.4h of sunshine.
Average temperature
Johnston, SC
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).
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
Johnston, SC
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
30.02"Hg - Average pressure in May:
30.03"Hg - Average pressure in June:
29.98"Hg
- Average pressure in July:
30"Hg - Average pressure in August:
29.99"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.14"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
Johnston, SC
- Average wind speed in January:
8mph - Average wind speed in February:
8.1mph - Average wind speed in March:
8mph - Average wind speed in April:
8.1mph - Average wind speed in May:
6.7mph - Average wind speed in June:
5.9mph
- Average wind speed in July:
5.6mph - Average wind speed in August:
5.2mph - Average wind speed in September:
5.8mph - Average wind speed in October:
6.8mph - Average wind speed in November:
7mph - Average wind speed in December:
7.5mph
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
Johnston, SC
The month with the highest relative humidity is December (76%).
The month with the lowest relative humidity is July (70%).
Average rainfall
Johnston, SC
- Average rainfall in January:
2.13" - Average rainfall in February:
2.52" - Average rainfall in March:
2.24" - Average rainfall in April:
2.8" - Average rainfall in May:
2.8" - Average rainfall in June:
2.17"
- Average rainfall in July:
2.44" - Average rainfall in August:
2.87" - Average rainfall in September:
1.42" - Average rainfall in October:
2.13" - Average rainfall in November:
2.05" - Average rainfall in December:
3.03"
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
Johnston, SC
- Average rainfall days in January:
10.3 days - Average rainfall days in February:
11 days - Average rainfall days in March:
13.2 days - Average rainfall days in April:
12.8 days - Average rainfall days in May:
14.8 days - Average rainfall days in June:
14.8 days
- Average rainfall days in July:
17.5 days - Average rainfall days in August:
16.2 days - Average rainfall days in September:
12.2 days - Average rainfall days in October:
8 days - Average rainfall days in November:
7.8 days - Average rainfall days in December:
11.2 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
Johnston, SC
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
Johnston, SC
- Average snowfall days in January:
0.4 days - Average snowfall days in February:
0.4 days - Average snowfall days in March:
0.2 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.1 days - Average snowfall days in December:
0.1 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 / Average sunshine
Johnston, SC
- Average daylight in January:
10h and 1min - Average daylight in February:
11h and 0min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 0min - Average daylight in May:
13h and 5min - Average daylight in June:
14h and 2min
- Average daylight in July:
14h and 1min - Average daylight in August:
13h and 2min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 2min - Average daylight in November:
10h and 2min - Average daylight in December:
9h and 5min
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 January:
5h and 4min - Average sunshine in February:
6h and 5min - Average sunshine in March:
7h and 3min - Average sunshine in April:
9h and 1min - Average sunshine in May:
10h and 0min - Average sunshine in June:
10h and 5min
- Average sunshine in July:
10h and 5min - Average sunshine in August:
10h and 2min - Average sunshine in September:
8h and 4min - Average sunshine in October:
6h and 5min - Average sunshine in November:
6h and 0min - Average sunshine in December:
5h and 2min
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
Johnston, SC
- Average sunshine days in January:
19.7 days - Average sunshine days in February:
15.8 days - Average sunshine days in March:
15.8 days - Average sunshine days in April:
15.8 days - Average sunshine days in May:
14.7 days - Average sunshine days in June:
12.8 days
- Average sunshine days in July:
11.2 days - Average sunshine days in August:
12.4 days - Average sunshine days in September:
16.2 days - Average sunshine days in October:
21.8 days - Average sunshine days in November:
20.9 days - Average sunshine days in December:
18.6 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
Johnston, SC
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
Johnston, SC
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
Johnston, SC
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
Weather forecast for your location
1. Click Locate me button
2. Allow the app to use your location
2. Allow the app to use your location
