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With its subtropical climate, you'll find flowers growing with abandon in the Houston area. Plus, with just 18 days per year of temperatures 32 degrees or less and temperatures rarely reaching 100 degrees, you'll have plenty of opportunities to enjoy the great outdoors year round. The National Oceanic and Atmospheric Administration reports the annual 2016 average temperature for Houston to be 71.4, with a December low of 50.6 degrees and a high average temperature of 93.4 in August. Annual rainfall totals in 2016 totaled 61 inches, with April and June the wettest months.