Weather is an important factor for most agricultural research projects. Below is a link to the USDA Beltsville Agricultural Research Center (BARC) Weather Station #5, South Farm, data. The weather station is located next to the Paint Branch Turfgrass Facility and records temperature, humidity, solar radiation, rainfall, and wind speed and direction. Current conditions and a summary for the month is also included.
http://www.ba.ars.usda.gov/weather/ba-weather
The University of Maryland Beltsville Facility Weather information