Photograph by Kathy Bell, owner of kbella photography.
Updated for 1981-2000 climatological norms.
As you would expect, July is the hottest month of the year in Birmingham. The average daytime high is 90.8F. The average overnight low is 71.4. There really isn’t much difference on average between July and August. The hottest day ever in Birmingham, occurred on July 29, 1930, when the mercury hit a sizzling 107F. The temperature has reached 105F or higher on 16 occasions in Birmingham. Eleven of those times were observed in the month of July. The coolest reading ever observed in the Magic City in July was 51F back on July 15, 1967.
July is not one of our sunniest month with 59% of possible sunshine on average. Six months are sunnier. Rain is usually observed on 13.7 days in the month and thunderstorms occur on 11.7 days in the month, both tops for the year. The mercury reaches 90F or higher on 18.4 days on average in July. On average, 4.80 inches of rain falls during the month. The most ever observed is 20.12 in July 1916. That is also the wettest month ever in Birmingham history. In 1983, 0.30 fell during the month, the driest July ever.
– Bill Murray