"On the third Thursday of every month, NOAA’s Climate Prediction Center issues an outlook for temperature and precipitation for the United States for the coming month. These climate outlooks are updated on the last day of each month. Those updated outlooks are the basis for the posts that appear on Climate.gov each month. Seasonal (90-day) outlooks are released around the middle of each month. " @NOAA Climate.gov

https://www.climate.gov/news-features/understanding-climate/understanding-noaas-monthly-and-seasonal-climate-outlooks