Warren, Warren County Climate Warren, the county seat of Warren County, is located in the Allegheny River Valley at the confluence of Conewango Creek in northwestern Pennsylvania. Elevations in the vicinity of Warren range from 1200 feet above sea level in the valley to 1700 feet above sea level on the mountain ridges within one mile to the north, northeast, and south. Wooded terrain extends for many miles in all directions with somewhat more dense tree growth to the east in the Allegheny National Forest. Typical of northwestern Pennsylvania, Warren has a rigorous climate.
Winters are long and cold while summers are comparatively short.
Cold weather usually begins in November and continues through March, however, the most severe conditions are confined to the December through February period when frigid outbreaks varying in length from a few days to a week or more are common. More general cloudiness during winter is primarily responsible for the relatively small daily temperature range. Abundant sunshine, mild to warm temperatures, and comparatively low humidities combine to produce pleasant summer conditions. Spring and fall are the transition seasons and the time of year with the greatest daily temperature range. Chances of a freeze after May 20 or before September 30, however, are only 25 percent.