Below is a table of monthly rainfall (in inches) for the Indianapolis International Airport for the past 20 years. Table is updated monthly.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
| 2004 | 4.65 | 0.77 | 4.33 | 1.54 | 8.55 | 4.44 | 7.72 | 4.73 | 0.75 | 4.31 | 5.14 | 1.95 | 48.88 |
| 2005 | 9.39 | 2.59 | 1.14 | 4.69 | 2.51 | 3.59 | 2.98 | 4.20 | 4.67 | 1.64 | 3.64 | 2.69 | 43.73 |
| 2006 | 3.30 | 1.89 | 6.79 | 3.63 | 4.34 | 5.63 | 3.98 | 3.01 | 3.53 | 5.45 | 4.25 | 5.24 | 51.04 |
| 2007 | 4.41 | 2.77 | 4.91 | 3.30 | 1.97 | 2.22 | 1.90 | 3.43 | 1.59 | 2.80 | 1.85 | 5.55 | 36.70 |
| 2008 | 2.14 | 4.34 | 7.49 | 1.54 | 5.54 | 8.00 | 6.58 | 1.83 | 2.04 | 1.97 | 1.97 | 5.58 | 49.02 |
| 2009 | 1.72 | 2.69 | 2.28 | 7.23 | 6.69 | 6.60 | 4.60 | 4.94 | 1.86 | 5.59 | 1.16 | 3.30 | 48.66 |
| 2010 | 1.22 | 0.97 | 3.09 | 2.97 | 4.43 | 9.73 | 2.87 | 0.37 | 0.56 | 1.32 | 4.46 | 1.86 | 33.85 |
| 2011 | 2.20 | 5.25 | 3.73 | 7.98 | 4.97 | 5.76 | 0.47 | 1.11 | 5.37 | 2.82 | 4.87 | 5.10 | 49.63 |
| 2012 | 3.48 | 1.38 | 4.14 | 3.36 | 2.70 | 0.09 | 0.83 | 6.51 | 7.73 | 3.87 | 1.33 | 2.58 | 38.00 |
| 2013 | 5.51 | 2.27 | 1.96 | 8.59 | 3.50 | 3.66 | 3.29 | 1.15 | 2.86 | 5.46 | 3.23 | 4.44 | 45.92 |
| 2014 | 2.34 | 2.45 | 2.38 | 5.39 | 4.87 | 7.04 | 3.10 | 2.95 | 2.53 | 3.17 | 2.80 | 2.55 | 41.57 |
| 2015 | 1.81 | 1.34 | 3.53 | 4.00 | 2.45 | 8.36 | 13.14 | 1.55 | 1.70 | 1.82 | 2.86 | 5.59 | 48.15 |
| 2016 | 1.46 | 2.25 | 4.20 | 5.86 | 3.74 | 4.53 | 5.66 | 7.32 | 4.67 | 1.96 | 2.77 | 1.52 | 45.94 |
| 2017 | 4.35 | 1.10 | 4.72 | 5.60 | 8.51 | 6.53 | 6.18 | 1.77 | 0.66 | 2.95 | 3.96 | 1.12 | 47.75 |
| 2018 | 2.00 | 4.65 | 4.07 | 5.41 | 1.42 | 3.99 | 3.00 | 4.28 | 5.46 | 2.45 | 3.54 | 3.79 | 44.06 |
| 2019 | 2.82 | 4.68 | 5.02 | 4.96 | 4.16 | 7.51 | 3.86 | 3.54 | 0.47 | 4.48 | 2.61 | 3.05 | 47.16 |
| 2020 | 5.32 | 3.89 | 4.68 | 1.72 | 7.13 | 4.44 | 4.90 | 2.09 | 0.12 | 5.35 | 3.65 | 1.63 | 44.92 |
| 2021 | 2.39 | 1.84 | 3.87 | 3.80 | 3.57 | 7.51 | 6.34 | 1.99 | 5.25 | 7.74 | 1.22 | 4.23 | 49.75 |
| 2022 | 1.13 | 4.58 | 4.67 | 4.42 | 3.77 | 1.18 | 3.10 | 4.44 | 2.12 | 1.42 | 1.42 | 2.63 | 34.88 |
| 2023 | 3.97 | 2.55 | 6.03 | 2.29 | 2.84 | 1.41 | 6.06 | 2.97 | 1.60 | 2.47 | 0.93 | 1.26 | 34.38 |
| 2024 | 4.92 | 1.62 | 2.47 | 7.77 | 5.55 | 2.16 | 6.46 | 2.10 | 1.52 | 0.60 | 3.92 | ||
| 1991-2020 Normals |
3.12 | 2.43 | 3.69 | 4.34 | 4.75 | 4.95 | 4.42 | 3.20 | 3.14 | 3.22 | 3.45 | 2.92 | 43.63 |
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