This report describes the typical weather at the South Bend (South Bend, Indiana, United States) weather station over the course of an average year. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
South Bend, Indiana has a humid continental climate with hot summers and no dry season. The area within 25 mi of this station is covered by croplands (73%), forests (16%), built-up areas (4%), oceans and seas (4%), and grasslands (3%).
Over the course of a year, the temperature typically varies from 17°F to 83°F and is rarely below -0°F or above 91°F.
The warm season lasts from May 25 to September 18 with an average daily high temperature above 73°F. The hottest day of the year is July 14, with an average high of 83°F and low of 64°F.
The cold season lasts from November 30 to March 3 with an average daily high temperature below 41°F. The coldest day of the year is January 18, with an average low of 17°F and high of 31°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 9:09 hours of daylight; the longest day is June 20 with 15:11 hours of daylight.
The earliest sunrise is at 6:10am on June 12 and the latest sunset is at 9:24pm on June 28. The latest sunrise is at 8:21am on November 3 and the earliest sunset is at 5:14pm on December 7.
Daylight savings time (DST) is observed in this location during 2012, starting in the spring on March 11 and ending in the fall on November 4.
The median cloud cover ranges from 41% (partly cloudy) to 100% (overcast). The sky is cloudiest on December 26 and clearest on July 17. The clearer part of the year begins around April 23. The cloudier part of the year begins around October 18.
On July 17, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 65% of the time, and overcast or mostly cloudy 33% of the time.
On December 26, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 80% of the time, and clear or mostly clear 20% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around December 30, occurring in 73% of days. Precipitation is least likely around August 22, occurring in 40% of days.
Over the entire year, the most common forms of precipitation are light rain, light snow, thunderstorms, and moderate rain.
Light rain is the most severe precipitation observed during 28% of those days with precipitation. It is most likely around October 20, when it is observed during 22% of all days.
Light snow is the most severe precipitation observed during 27% of those days with precipitation. It is most likely around January 15, when it is observed during 46% of all days.
Thunderstorms are the most severe precipitation observed during 19% of those days with precipitation. They are most likely around July 6, when it is observed during 23% of all days.
Moderate rain is the most severe precipitation observed during 12% of those days with precipitation. It is most likely around October 20, when it is observed during 10% of all days.
During the warm season, which lasts from May 25 to September 18, there is a 42% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of thunderstorms (46% of days with precipitation have at worst thunderstorms), light rain (34%), and moderate rain (15%).
During the cold season, which lasts from November 30 to March 3, there is a 69% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light snow (57% of days with precipitation have at worst light snow), moderate snow (13%), light rain (13%), and moderate rain (6%).
The likelihood of snow falling is highest around January 16, occurring in 59% of days. The season in which it is relatively likely for snow to fall spans from November 8 to April 2.
Either snow rarely accumulates at this location or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 43% (comfortable) to 93% (very humid) over the course of the year, rarely dropping below 25% (dry) and reaching as high as 100% (very humid).
The air is driest around May 2, at which time the relative humidity drops below 54% (mildly humid) three days out of four; it is most humid around August 18, exceeding 90% (very humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a year, the dew point typically varies from 11°F (dry) to 67°F (muggy) and is rarely below -7°F (dry) or above 75°F (very muggy).
There are two periods in the year that are most comfortable: The first is between May 7 and July 4 and the second is between August 25 and October 9. The air feels neither too dry nor too muggy during these periods.
Over the course of the year typical wind speeds vary from 0 mph to 18 mph (calm to fresh breeze), rarely exceeding 26 mph (strong breeze).
The highest average wind speed of 11 mph (gentle breeze) occurs around April 3, at which time the average daily maximum wind speed is 18 mph (fresh breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around August 8, at which time the average daily maximum wind speed is 13 mph (moderate breeze).