January Weather in Johnson City, United States

Last updated: June 24, 2025

In Johnson City, United States, the average temperature in January hovers around 3°C (37°F), with extremes that can plunge to a chilly -17°C (1°F) or soar to a warm 23°C (74°F). Expect 95 mm (3.7 in) of precipitation over 13 days, creating a humid atmosphere with an average humidity of 87%. This month is a blend of cool temperatures and moisture, perfect for cozy indoor activities!

January Temperature in Johnson City

In January in Johnson City, the average temperature is 3°C (37°F). Maximums can reach 23°C (74°F), while minimums can drop as low as -17°C (1°F). Be prepared for a wide range of temperatures and pack accordingly when visiting.

January Weather in Johnson City: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Johnson City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Johnson City, January typically has an average temperature of 3°C (37°F), with highs reaching up to 23°C (74°F) and lows dropping to around -17°C (1°F).
JanFebMarAprMayJunJulAugSepOctNovDec374347546369737168584541
Data source: Temperature data for Johnson City generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Johnson City

In Johnson City in January, the precipitation amount is 95 mm (3.7 in) over the course of 13 days.

January Precipitation Trends in Johnson City

The chart displays monthly precipitation patterns in Johnson City, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Johnson City, January typically receives around 95 mm (3.7 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec951451291371221191021189712283125
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Johnson City

In Johnson City in January, humidity is 87%. With an average temperature of 3°C (37°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and necessitating proper layers to stay warm while navigating the wet conditions.

January Average Humidity in Johnson City

This chart illustrates the average monthly humidity levels in Johnson City, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Johnson City is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Johnson City

In Johnson City in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Johnson City for better planning.

Maximum UV Index Levels in Johnson City for January

The chart shows the monthly maximum UV Index (UVI) for Johnson City in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in Johnson City typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111010853
Data source: Johnson City January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How January Weather in Johnson City Compares to Other Months

Weather in Johnson City varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Johnson City, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Johnson City, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)95 mm (3.7 inches)87%moderate
February Weather6°C (43°F)145 mm (5.7 inches)87%high
March Weather8°C (47°F)129 mm (5.1 inches)86%very high
April Weather12°C (55°F)137 mm (5.4 inches)84%very high
May Weather17°C (64°F)122 mm (4.8 inches)83%extreme
June Weather20°C (69°F)118 mm (4.7 inches)83%extreme
July Weather23°C (73°F)102 mm (4.0 inches)79%extreme
August Weather22°C (71°F)118 mm (4.7 inches)66%very high
September Weather20°C (68°F)97 mm (3.8 inches)68%very high
October Weather15°C (59°F)122 mm (4.8 inches)78%very high
November Weather7°C (45°F)83 mm (3.3 inches)89%moderate
December Weather5°C (41°F)125 mm (4.9 inches)86%moderate

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