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
In Harpers Ferry, the lowest average temperatures are observed in January, with a high of 23.2°F (-4.9°C) and a low of 10.6°F (-11.9°C).Humidity
The months with the highest humidity in Harpers Ferry are January and February, with an average relative humidity of 88%.Rainfall
January is the month with the least rainfall. Rain falls for 3.8 days and accumulates 0.75" (19mm) of precipitation.Snowfall
Months with snowfall in Harpers Ferry are January through May, October through December. In January, it is snowing for 11.7 days. Throughout January, 3.7" (94mm) of snow is accumulated. In Harpers Ferry, Iowa, during the entire year, snow falls for 44.5 days and aggregates up to 15.47" (393mm) of snow.Daylight
The average length of the day in January is 9h and 25min.On the first day of the month, sunrise is at 7:36 am and sunset at 4:39 pm. On the last day of January, in Harpers Ferry, Iowa, sunrise is at 7:21 am and sunset at 5:14 pm CST.
Sunshine
With an average of 3.4h of sunshine, January has the least sunshine of the year in Harpers Ferry, Iowa.UV index
January, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Harpers Ferry. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The UV index of 1 during January leads to these advisories:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month in Harpers Ferry?
How cold is January in Harpers Ferry?
What are the most humid months in Harpers Ferry?
What is the average humidity in January in Harpers Ferry?
What is the driest month in Harpers Ferry?
How many days does it rain in January in Harpers Ferry?
How much does it snow in Harpers Ferry in January?
How many hours of daylight does Harpers Ferry have in January?
When are sunrise and sunset in January in Harpers Ferry?
What is the month with the least sunshine in Harpers Ferry?
How long on average sun shines in January in Harpers Ferry?
What are the months with the lowest UV index in Harpers Ferry?
What is the UV index intensity in January in Harpers Ferry?
Average temperature in January
Harpers Ferry, IA
- Average high temperature in January: 23.2°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (23.2°F).
- Average low temperature in January: 10.6°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (10.6°F).
Average pressure in January
Harpers Ferry, IA
- Average pressure in January: 30.13"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in January
Harpers Ferry, IA
- Average wind speed in January: 9.4mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity in January
Harpers Ferry, IA
- Average humidity in January: 88%
The months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is October (76%).
Average rainfall in January
Harpers Ferry, IA
- Average rainfall in January: 0.75"
The wettest month (with the highest rainfall) is June (3.9").
The driest month (with the least rainfall) is January (0.75").
Average rainfall days in January
Harpers Ferry, IA
- Average rainfall days in January: 3.8 days
The month with the highest number of rainy days is June (18.6 days).
The month with the least rainy days is February (3.6 days).
Average snowfall in January
Harpers Ferry, IA
- Average snowfall in January: 3.7"
The month with the highest snowfall is February (3.94").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Harpers Ferry, IA
- Average snowfall days in January: 11.7 days
The month with the highest number of snowfall days is January (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Harpers Ferry, IA
- Average daylight in January: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in January: 3h and 2min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in January
Harpers Ferry, IA
- Average sunshine days in January: 17.5 days
The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is June (9.6 days).
Average UV index in January
Harpers Ferry, IA
- Average UV index in January: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in January
Harpers Ferry, IA
- Average cloud cover in January: 64
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in January
Harpers Ferry, IA
- Average visibility in January: 5mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
Harpers Ferry, Iowa, USA
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