Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
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).Humidity
In January, the average relative humidity is 72%.Rainfall
In January, in Johnston, the rain falls for 10.3 days. Throughout January, 2.13" (54mm) of precipitation is accumulated. In Johnston, during the entire year, the rain falls for 149.8 days and collects up to 28.58" (726mm) of precipitation.Snowfall
Months with snowfall are January through March and December. In Johnston, in January, snow falls for 0.4 days, with typically accumulated 0.24" (6mm) of snow. Throughout the year, there are 1.2 snowfall days, and 1.02" (26mm) of snow is accumulated.Daylight
In Johnston, the average length of the day in January is 10h and 13min.On the first day of January, sunrise is at 7:32 am and sunset at 5:29 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:56 pm EST.
Sunshine
In January, the average sunshine in Johnston is 5.6h.UV index
The month with the lowest UV index is January, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.Note: In January, an average UV index of 2 transforms into the following instructions:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Frequently asked questions
What is the coldest time of year in Johnston?
What are January temperatures in Johnston?
What is the average humidity in January in Johnston?
How much does it rain in Johnston in January?
How much does it snow in Johnston in January?
How many hours of daylight does Johnston have in January?
When are sunrise and sunset in January in Johnston?
How many hours of sunshine does Johnston have in January?
When is the lowest UV index in Johnston?
What is the UV index reading in January in Johnston?
Average temperature in January
Johnston, SC
- Average high temperature in January: 52.7°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 January: 36.9°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 January
Johnston, SC
- Average pressure in January: 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 in January
Johnston, SC
- Average wind speed in January: 8mph
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 January
Johnston, SC
- Average humidity in January: 72%
The month with the highest relative humidity is December (76%).
The month with the lowest relative humidity is July (70%).
Average rainfall in January
Johnston, SC
- Average rainfall in January: 2.13"
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 January
Johnston, SC
- Average rainfall days in January: 10.3 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 January
Johnston, SC
- Average snowfall in January: 0.24"
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 January
Johnston, SC
- Average snowfall days in January: 0.4 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 January /
Average sunshine in January
Johnston, SC
- Average daylight in January: 10h and 1min
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
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 January
Johnston, SC
- Average sunshine days in January: 19.7 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 January
Johnston, SC
- Average UV index in January: 2
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 January
Johnston, SC
- Average cloud cover in January: 37
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 January
Johnston, SC
- Average visibility in January: 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
Weather forecast for your location
2. Allow the app to use your location
