TOPOGRAPHY, CLIMATE & AIR QUALITY
Greenbrier County is in the southeastern corner of West Virginia on the Virginia state line. 
Predominantly rural in character, Greenbrier Valley features a series of steep, parallel ridges and narrow valleys in the eastern part of the county, which is primarily woodlands and well suited for recreational use. A rolling limestone valley crosses the central part of the county (northeast to southwest) at an elevation of about 2,000 feet. The western end of the county is best described as rugged and mountainous with some elevations over 4,000 feet. Forestland covers 70% of the county's 656,640 acres.
The Greenbrier River Valley enjoys four distinct seasons with snowfall and weather patterns varying between the eastern and western ends of the county. Prevailing westerly winds bring lower temperatures and more rainfall to the west end, while the eastern part of the county is generally drier and warmer. Mean temperatures range from 29 degrees in January and 49 degrees in April to average highs of 81 degrees in July and 64 degrees in October; average precipitation is 3.19, 3.28, 4.16 and 2.77 inches for the aforementioned months respectively
As for air quality, ozone levels for Greenbrier County are well below the National Ambient Air Quality Standard and are among the lowest in the state, according to the West Virginia Division of Environmental Protection. Particulate matter (PM 2.5), which can have some of the most adverse effects on health, are monitored by WVDEP at a monitoring station located at Keenys Knob just over the Greenbrier County line in Summers County; this particular station has the lowest readings of any station monitored in West Virginia and is far below the National Ambient Air Quality Standard.
Temperature & Precipitation
The northwestern part of Greenbrier County has some of the highest ridges in the state. Prevailing westerly winds bring lower temperatures and more precipitation to the west end. The leeward (eastern) part of the county is generally drier and warmer. The area has four distinct seasons, extremes generally associated with summer and winter are infrequent. The figures below are an average of temperature/precipitation recorded at the Greenbrier Valley Airport from 1993 - 1998.
| High | Low | Average | Rain | Snow | |
| January | 38.6 | 21.9 | 30.3 | 4.9" | 14.6" |
| February | 42.3 | 22.7 | 32.6 | 3.9" | 10.5" |
| March | 50.4 | 28.9 | 40.1 | 4.7" | 9.9" |
| April | 64.2 | 36.3 | 50.3 | 2.9" | |
| May | 71.1 | 44.9 | 57.9 | 4.9" | |
| June | 77.5 | 55.4 | 71.4 | 4.6" | |
| July | 82.6 | 59.3 | 71.6 | 3.2" | |
| August | 80.5 | 57.6 | 69.1 | 4.0" | |
| September | 72.3 | 50.8 | 61.5 | 3.3" | |
| October | 64.4 | 37.8 | 51.1 | 1.6" | |
| November | 49.8 | 28.8 | 39.2 | 2.8" | 2.0" |
| December | 41.5 | 24.1 | 30.5 | 3.8" | 9.2" |
