January Weather at Bradley International Airport United States

Daily high temperatures are around 36°F, rarely falling below 21°F or exceeding 50°F. The lowest daily average high temperature is 35°F on January 15.

Daily low temperatures decrease by 3°F, from 22°F to 19°F, rarely falling below 4°F or exceeding 35°F. The lowest daily average low temperature is 19°F on January 29.

For reference, on July 20, the hottest day of the year, temperatures at Bradley International Airport typically range from 65°F to 84°F, while on January 29, the coldest day of the year, they range from 19°F to 35°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on January. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Odessa, Ukraine (4,741 miles away); Dzorastan, Armenia (5,655 miles); and Damāvand, Iran (6,043 miles) are the far-away foreign places with temperatures most similar to Bradley International Airport (view comparison).

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The month of January at Bradley International Airport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 53% throughout the month. The highest chance of overcast or mostly cloudy conditions is 54% on January 3.

The clearest day of the month is January 25, with clear, mostly clear, or partly cloudy conditions 48% of the time.

For reference, on January 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 54%, while on September 5, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 64%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Bradley International Airport, the chance of a wet day over the course of January is gradually decreasing, starting the month at 26% and ending it at 22%.

For reference, the year's highest daily chance of a wet day is 37% on May 30, and its lowest chance is 21% on January 29.

Over the course of January at Bradley International Airport, the chance of a day with only rain decreases from 12% to 9%, the chance of a day with mixed snow and rain remains an essentially constant 6% throughout, and the chance of a day with only snow remains an essentially constant 8% throughout.

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during January at Bradley International Airport is essentially constant, remaining about 1.8 inches throughout, and rarely exceeding 3.5 inches or falling below 0.2 inches.

The lowest average 31-day accumulation is 1.6 inches on January 24.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day snowfall during January at Bradley International Airport is increasing, starting the month at 10.0 inches, when it rarely exceeds 21.5 inches or falls below 1.9 inches, and ending the month at 11.3 inches, when it rarely exceeds 22.0 inches or falls below 2.1 inches.

The highest average 31-day accumulation is 11.5 inches on January 25.

Over the course of January at Bradley International Airport, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 48 minutes, implying an average daily increase of 1 minute, 36 seconds, and weekly increase of 11 minutes, 9 seconds.

The shortest day of the month is January 1, with 9 hours, 11 minutes of daylight and the longest day is January 31, with 9 hours, 59 minutes of daylight.

The latest sunrise of the month at Bradley International Airport is 7:18 AM on January 4 and the earliest sunrise is 14 minutes earlier at 7:04 AM on January 31.

The earliest sunset is 4:29 PM on January 1 and the latest sunset is 34 minutes later at 5:03 PM on January 31.

Daylight saving time is observed at Bradley International Airport during 2024, but it neither starts nor ends during January, so the entire month is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:15 AM and sets 15 hours, 14 minutes later, at 8:29 PM, while on December 21, the shortest day of the year, it rises at 7:15 AM and sets 9 hours, 7 minutes later, at 4:22 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for January 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy at Bradley International Airport is essentially constant during January, remaining around 0% throughout.

For reference, on July 29, the muggiest day of the year, there are muggy conditions 37% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed at Bradley International Airport is gradually increasing during January, increasing from 5.8 miles per hour to 6.3 miles per hour over the course of the month.

For reference, on February 26, the windiest day of the year, the daily average wind speed is 6.6 miles per hour, while on July 31, the calmest day of the year, the daily average wind speed is 3.6 miles per hour.

The hourly average wind direction at Bradley International Airport throughout January is predominantly from the west, with a peak proportion of 47% on January 14.

Bradley International Airport is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature at Bradley International Airport is decreasing during January, falling by 5°F, from 43°F to 38°F, over the course of the month.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season at Bradley International Airport typically lasts for 6.0 months (182 days), from around April 17 to around October 16, rarely starting before April 1 or after May 5, and rarely ending before September 29 or after November 3.

The month of January at Bradley International Airport is reliably fully outside of the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days at Bradley International Airport are essentially constant during January, remaining within 2°F of 2°F throughout.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy at Bradley International Airport is gradually increasing during January, rising by 0.7 kWh, from 1.7 kWh to 2.3 kWh, over the course of the month.