Last updated: June 24, 2025
In Indianapolis, United States, the average temperature in December hovers around 2°C (36°F). Expect a chilly range, with minimums dipping to -19°C (-2°F) and maximums rising to 18°C (64°F). During this time, be prepared for approximately 80 mm (3.2 in) of precipitation spread across 10 days, contributing to an average humidity of 87%.
In December in Indianapolis, the average temperature is 2°C (36°F), with maximums reaching 18°C (64°F) and minimums dropping as low as -19°C (-2°F). Travelers should be prepared for a wide range of temperatures during their visit.
In Indianapolis in December, the precipitation amount is 80 mm (3.2 in) over a span of 10 days.
In Indianapolis in December, humidity is 87%. With an average temperature of 2°C (36°F), this humidity feels like an unwelcome chill that seeps into your bones, making outdoor exploration feel damp and heavy, and encouraging travelers to seek the warmth of indoor attractions instead.
In Indianapolis in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Indianapolis, you can check the information here.
UV Risk Categories
Weather in Indianapolis varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Indianapolis, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (30°F) | 82 mm (3.2 inches) | 87% | moderate |
| February Weather | 1°C (34°F) | 93 mm (3.7 inches) | 85% | moderate |
| March Weather | 6°C (43°F) | 127 mm (5.0 inches) | 86% | high |
| April Weather | 11°C (52°F) | 94 mm (3.7 inches) | 84% | very high |
| May Weather | 18°C (65°F) | 132 mm (5.2 inches) | 79% | very high |
| June Weather | 23°C (74°F) | 107 mm (4.2 inches) | 82% | extreme |
| July Weather | 25°C (77°F) | 108 mm (4.2 inches) | 79% | very high |
| August Weather | 23°C (74°F) | 101 mm (4.0 inches) | 70% | very high |
| September Weather | 21°C (70°F) | 80 mm (3.2 inches) | 69% | very high |
| October Weather | 14°C (58°F) | 103 mm (4.0 inches) | 76% | high |
| November Weather | 5°C (42°F) | 93 mm (3.7 inches) | 88% | moderate |
| December Weather | 2°C (36°F) | 80 mm (3.2 inches) | 87% | moderate |