The summary climate graph for Harrisburg, PA shows a selection of temperature, rainfall and snow minimum, mean and maximum measures over the course of a year. Click on each of the measures in the key to toggle them on and off.
The warmest month in Capital City Airport, Harrisburg, Pennsylvania is July with an average high temperature of 86.7°F. The hottest day on record was July 23 1991 when the temperature hit 102.9°F. During January the overnight temperature drops to an average of 25.3°F with the lowest temperature of -15.2°F being recorded on January 21 1994.
The warmest days on record are:
| 23 Jul 1991 | 102.9°F |
| 7 Jul 2012 | 102.9°F |
| 22 Jul 2011 | 102°F |
| 18 Jul 1997 | 100.4°F |
| 2 Aug 1991 | 100°F |
The warmest months on average were:
| July 1999 | 90.6°F |
| July 2012 | 90.3°F |
| July 2011 | 89.7°F |
| July 1991 | 89.2°F |
| July 2010 | 89°F |
The coldest days on record are:
| 21 Jan 1994 | -15.2°F |
| 5 Feb 1996 | -3.1°F |
| 17 Jan 2009 | 1.9°F |
| 24 Jan 2011 | 1.9°F |
| 9 Jan 1996 | 3.9°F |
The coldest months on average were:
| January 1994 | 15.9°F |
| February 2007 | 19.2°F |
| February 1994 | 19.5°F |
| January 2009 | 20.7°F |
| January 2011 | 21.4°F |
The wettest month by average rainfall in Harrisburg, PA is August with an average of 2.4 inches of rain falling on 4 to 5 days.Although in April it typically rains on more days with 2.2 inches falling in 4 to 5 days. The driest month in Harrisburg, PA is February with an average of 1.0 inches of rain falling on 2 to 3 days.
The wettest days on record are:
| 3 May 2010 | 3.1 inches |
| 19 May 2011 | 1.9 inches |
| 24 May 2012 | 1.6 inches |
| 12 May 2006 | 1.3 inches |
| 7 May 1991 | 1.1 inches |
The wettest months on record are:
| April 2011 | 10.7 inches |
| June 2006 | 8.2 inches |
| August 2011 | 8.2 inches |
| December 2008 | 8 inches |
| May 2012 | 6.7 inches |
The driest months on record are:
| November 1991 | 0 inches |
| February 1992 | 0 inches |
| January 1992 | 0 inches |
| October 1991 | 0 inches |
| March 1992 | 0 inches |