Weather conditions can vary widely in any month - for temperature, precipitation, wind, humidity, and evaporation. "Normal" or "historical" data cannot determine the best schedule or sprinkler settings for irrigating landscapes.
Frequent watering is detrimental to the health of your lawn. Irrigate in the early morning as the first choice. Irrigate in the evening as the second choice.
Generally, running an irrigation system on a lawn for more than five minutes will result in runoff. Precise watering times vary depending on the type of watering device, soil, slope and plants.
Next - Irrigation Seasonal Guidance