Indianapolis has a humid subtropical climate, so you can expect lots of precipitation throughout the year. (The city ranks 14th on our list of the Gloomiest Cities in the US!3) Winters are snowy and chilly, with highs in the 30s and lows in the 20s or teens.4 Summers are humid and warm, with highs in the 80s and lows in the 60s. Keep in mind, temperatures will probably feel more extreme because of the humidity!