McHenry, Maryland, experiences hot summers and mild temperatures in the spring and fall seasons. According to historical data from the Weather Channel, on average in McHenry, the warmest month is July, and the coolest month is January.
January has a monthly average high of 36 degrees (Fahrenheit) and an average low of 17. February experiences an average high of 40 and an average low of 19. March's high-low averages are 50 and 26.
April's averages range from a high of 60 degrees to a low of 35. May's average high and low temperatures are 69 and 44, respectively. For June, these averages are 76 (high) and 53 (low).
July's average high and low temperatures are 79 and 57, while August experiences an average high temperature of 78 and an average low of 56. September ranges from a high of 72 to a low of 50 degrees.
October has a monthly average high of 62 degrees and an average low of 38. November's average high and low temperatures are 50 and 30, respectively. Finally, December's temperature range averages 41 (high) and 22 (low).
