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
Waltham's coldest month, January, registers temperatures that range from a high of 33.3°F (0.7°C) to a low of 21.6°F (-5.8°C).Humidity
In Waltham, the average relative humidity in January is 77%.Rainfall
In Waltham, during January, the rain falls for 5.3 days and regularly aggregates up to 0.59" (15mm) of precipitation. Throughout the year, there are 106.3 rainfall days, and 8.5" (216mm) of precipitation is accumulated.Snowfall
January through May, November and December are months with snowfall in Waltham. In January, it is snowing for 4.4 days. Throughout January, 0.67" (17mm) of snow is accumulated. In Waltham, during the entire year, snow falls for 19.6 days and aggregates up to 4.02" (102mm) of snow.Daylight
In January, the average length of the day is 9h and 30min.On the first day of the month, sunrise is at 7:14 am and sunset at 4:22 pm. On the last day of January, in Waltham, sunrise is at 6:59 am and sunset at 4:56 pm EST.
Sunshine
In January, the average sunshine is 5.2h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Waltham. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 2 during January leads to these advisories:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
What part of the year is the coldest in Waltham?
How cold is January in Waltham?
What is the average humidity in January in Waltham?
How many days does it rain in January in Waltham?
How much does it snow in Waltham in January?
What is the average length of the day in January in Waltham?
When are sunrise and sunset in January in Waltham?
How long on average sun shines in January in Waltham?
What is the month with the lowest UV index in Waltham?
What is the UV index intensity in January in Waltham?
Average temperature in January
Waltham, MA
- Average high temperature in January: 33.3°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.3°F).
- Average low temperature in January: 21.6°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in January
Waltham, MA
- Average pressure in January: 30.01"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in January
Waltham, MA
- Average wind speed in January: 9.1mph
The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in January
Waltham, MA
- Average humidity in January: 77%
The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is April (70%).
Average rainfall in January
Waltham, MA
- Average rainfall in January: 0.59"
The wettest months (with the highest rainfall) are April and November (0.87").
The driest month (with the least rainfall) is September (0.35").
Average rainfall days in January
Waltham, MA
- Average rainfall days in January: 5.3 days
The month with the highest number of rainy days is July (12.4 days).
The month with the least rainy days is January (5.3 days).
Average snowfall in January
Waltham, MA
- Average snowfall in January: 0.67"
The month with the highest snowfall is December (1.14").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in January
Waltham, MA
- Average snowfall days in January: 4.4 days
The month with the highest number of snowfall days is February (5.4 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in January /
Average sunshine in January
Waltham, MA
- Average daylight in January: 9h and 3min
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 6min).
- Average sunshine in January: 5h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in January
Waltham, MA
- Average sunshine days in January: 22.2 days
The month with the most sunshine days is January (22.2 days).
The month with the least sunshine days is June (15.8 days).
Average UV index in January
Waltham, MA
- Average UV index in January: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in January
Waltham, MA
- Average cloud cover in January: 44
The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in January
Waltham, MA
- 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).
Waltham, Massachusetts, USA
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