Climate Data for Latitude 39.25 Longitude -77.75

Köppen climate classification: Cfa (Climate: warm temperate; Precipitation: fully humid; Temperature: hot summer)
 

Locations

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Antietam National Battlefield
Harpers Ferry National Historical Park

Averages (English) Metric

TypeUnitsJanFebMarAprMayJunJulAugSepOctNovDecPeriod
Min Temp23.724.632.241.351.060.164.462.855.844.335.426.4106 years
Mean Temp32.934.843.653.763.672.176.274.568.056.946.135.6109 years
Max Temp42.345.055.066.376.284.288.186.480.269.556.944.8109 years
FrostDays31.028.330.921.46.13.33.46.03.98.928.431.028 years
WetDays11.39.610.710.910.19.78.910.76.66.88.39.7109 years
Precipitationin2.82.53.43.53.94.13.73.93.23.22.83.0109 years
Potential Evapotranspirationin1.31.62.84.04.85.35.54.83.72.82.01.3109 years
Yearly Average Temperatures 1901 - 2009 (English) Latitude 39.25 Longitude -77.75
Monthly Mean Temperatures 1901 - 2009 (English) Latitude 39.25 Longitude -77.75
Yearly Total Frost Days 1903 - 2009 Latitude 39.25 Longitude -77.75
Yearly Total Precipitation 1901 - 2009 (English) Latitude 39.25 Longitude -77.75
Yearly Total Wet Days 1901 - 2009 Latitude 39.25 Longitude -77.75
Yearly Total Potential Evapotranspiration 1901 - 2009 (English) Latitude 39.25 Longitude -77.75

Climate data provided by CRU TS 3.1 - University of East Anglia Climate Research Unit (CRU). [Phil Jones, Ian Harris]. CRU Time Series (TS) high resolution gridded datasets, [Internet]. NCAS British Atmospheric Data Centre, 2008, Accessed: 28-July-2011
Charting software provided by pChart - a PHP class to build charts.
Köppen climate classification provided by Kottek, M., J. Grieser, C. Beck, B. Rudolf, and F. Rubel, 2006: World Map of Köppen-Geiger Climate Classification updated. Meteorol. Z., 15, 259-263
The calculation method for the potential evapotranspiration is the FAO grass reference equation (Ekstrom et al., 2007, which is based on Allen et al., 1994). It is a variant of the Penman Monteith method using TMP, TMN, TMX, VAP, CLD.