Climate and Average Weather Year Round in Jeffersonville United States

In Jeffersonville, the summers are long, hot, and oppressive; the winters are short, cold, and wet; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 37°F to 92°F and is rarely below 24°F or above 97°F.

Based on the tourism score, the best times of year to visit Jeffersonville for warm-weather activities are from mid April to early June and from early September to late October.

The hot season lasts for 3.9 months, from May 20 to September 16, with an average daily high temperature above 85°F. The hottest month of the year in Jeffersonville is July, with an average high of 91°F and low of 72°F.

The cool season lasts for 2.9 months, from November 27 to February 25, with an average daily high temperature below 64°F. The coldest month of the year in Jeffersonville is January, with an average low of 38°F and high of 58°F.

In Jeffersonville, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year in Jeffersonville begins around August 28 and lasts for 2.9 months, ending around November 25.

The clearest month of the year in Jeffersonville is October, during which on average the sky is clear, mostly clear, or partly cloudy 66% of the time.

The cloudier part of the year begins around November 25 and lasts for 9.1 months, ending around August 28.

The cloudiest month of the year in Jeffersonville is January, during which on average the sky is overcast or mostly cloudy 49% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Jeffersonville varies throughout the year.

The wetter season lasts 3.4 months, from May 27 to September 7, with a greater than 31% chance of a given day being a wet day. The month with the most wet days in Jeffersonville is July, with an average of 14.0 days with at least 0.04 inches of precipitation.

The drier season lasts 8.6 months, from September 7 to May 27. The month with the fewest wet days in Jeffersonville is October, with an average of 5.7 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Jeffersonville is July, with an average of 14.0 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 46% on July 25.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Jeffersonville experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Jeffersonville. The month with the most rain in Jeffersonville is February, with an average rainfall of 4.3 inches.

The month with the least rain in Jeffersonville is October, with an average rainfall of 2.3 inches.

The length of the day in Jeffersonville varies significantly over the course of the year. In 2024, the shortest day is December 21, with 10 hours, 0 minutes of daylight; the longest day is June 20, with 14 hours, 18 minutes of daylight.

The earliest sunrise is at 6:25 AM on June 11, and the latest sunrise is 1 hour, 27 minutes later at 7:52 AM on November 2. The earliest sunset is at 5:27 PM on December 3, and the latest sunset is 3 hours, 18 minutes later at 8:45 PM on June 28.

Daylight saving time (DST) is observed in Jeffersonville during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

The figure below presents a compact representation of key lunar data for 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.

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.

Jeffersonville experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 5.0 months, from May 9 to October 10, during which time the comfort level is muggy, oppressive, or miserable at least 24% of the time. The month with the most muggy days in Jeffersonville is July, with 28.6 days that are muggy or worse.

The month with the fewest muggy days in Jeffersonville is February, with 0.2 days that are muggy or worse.

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 in Jeffersonville experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.9 months, from October 15 to May 12, with average wind speeds of more than 5.4 miles per hour. The windiest month of the year in Jeffersonville is March, with an average hourly wind speed of 6.5 miles per hour.

The calmer time of year lasts for 5.1 months, from May 12 to October 15. The calmest month of the year in Jeffersonville is August, with an average hourly wind speed of 4.4 miles per hour.

The predominant average hourly wind direction in Jeffersonville varies throughout the year.

The wind is most often from the east for 3.7 months, from August 12 to December 3, with a peak percentage of 45% on September 6. The wind is most often from the west for 8.3 months, from December 3 to August 12, with a peak percentage of 34% on January 1.

To characterize how pleasant the weather is in Jeffersonville throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Jeffersonville for general outdoor tourist activities are from mid April to early June and from early September to late October, with a peak score in the last week of September.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Jeffersonville for hot-weather activities is from late May to mid September, with a peak score in the last week of August.

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

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 in Jeffersonville typically lasts for 8.1 months (247 days), from around March 14 to around November 16, rarely starting before February 16 or after April 5, and rarely ending before October 28 or after December 10.

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.

Based on growing degree days alone, the first spring blooms in Jeffersonville should appear around January 30, only rarely appearing before January 17 or after February 14.

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 experiences significant seasonal variation over the course of the year.

The brighter period of the year lasts for 4.1 months, from April 8 to August 11, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest month of the year in Jeffersonville is May, with an average of 6.7 kWh.

The darker period of the year lasts for 2.8 months, from November 12 to February 5, with an average daily incident shortwave energy per square meter below 3.6 kWh. The darkest month of the year in Jeffersonville is December, with an average of 2.8 kWh.

For the purposes of this report, the geographical coordinates of Jeffersonville are 32.688 deg latitude, -83.347 deg longitude, and 518 ft elevation.

The topography within 2 miles of Jeffersonville contains only modest variations in elevation, with a maximum elevation change of 197 feet and an average elevation above sea level of 470 feet. Within 10 miles also contains only modest variations in elevation (354 feet). Within 50 miles contains only modest variations in elevation (741 feet).

The area within 2 miles of Jeffersonville is covered by trees (82%) and herbaceous vegetation (12%), within 10 miles by trees (79%), and within 50 miles by trees (64%) and cropland (21%).