Weather Averages in Indianapolis
Note: All temperature measurements below the first paragraph in parentheses are in Celsius, while temperature measurements that are not in parentheses are in Fahrenheit.
Indianapolis was recently upgraded to a humid subtropical climate from humid continental climate zone (Köppen: Dfa) using the 0 °C (32 °F) isotherm, but still experiences four distinct seasons. The city is in USDA hardiness zone 6a.
Typically, summers are hot, humid and wet. Winters are generally cold with moderate snowfall. The July daily average temperature is 75.4 °F (24.1 °C). High temperatures reach or exceed 90 °F (32 °C) an average of 18 days each year, and occasionally exceed 95 °F (35 °C). Spring and autumn are usually pleasant, if at times unpredictable; midday temperature drops exceeding 30 °F or 17 °C are common during March and April, and instances of very warm days (80 °F or 27 °C) followed within 36 hours by snowfall are not unusual during these months. Winters are cold, with an average January temperature of 28.1 °F (−2.2 °C). Temperatures dip to 0 °F (−18 °C) or below an average of 4.7 nights per year.
The rainiest months occur in the spring and summer, with slightly higher averages during May, June, and July. May is typically the wettest, with an average of 5.05 inches (12.8 cm) of precipitation. Most rain is derived from thunderstorm activity; there is no distinct dry season, although occasional droughts occur. Severe weather is not uncommon, particularly in the spring and summer months; the city experiences an average of 20 thunderstorm days annually.
The city’s average annual precipitation is 42.4 inches (108 cm), with snowfall averaging 25.9 inches (66 cm) per season. Official temperature extremes range from 106 °F (41 °C), set on July 14, 1936, to −27 °F (−33 °C), set on January 19, 1994.
As for average temperatures, here they are. Again, reminder that all temperature measurements below are in parentheses are in Celsius, while temperature measurements that are not in parentheses are in Fahrenheit.
Average temperatures in January is 28.1 (−2.2) degrees.
Average temperatures in February is 32.1 (0.1) degrees.
Average temperatures in March is 42.2 (5.7) degrees.
Average temperatures in April is 53.0 (11.7) degrees.
Average temperatures in May is 62.7 (17.1) degrees.
Average temperatures in June is 72.0 (22.2) degrees.
Average temperatures in July is 75.4 (24.1) degrees.
Average temperatures in August is 74.2 (23.4) degrees.
Average temperatures in September is 66.9 (19.4) degrees.
Average temperatures in October is 55.0 (12.8) degrees.
Average temperatures in November is 43.6 (6.4) degrees.
Average temperatures in December is 31.6 (−0.2) degrees.
With these you have a quick breakdown on Indianapolis’ weather, and plan your travels to the city. You now know when to go for a snowy good time, and on the other hand, you know which time of the year you have to go to the city for a warm and wholesome time.