Templeton Gap has long been considered one of the cool breezy areas of Paso Robles AVA. The topography is comprised of Santa Lucia Range mountain slopes and broad alluvial terraces. Elevations run 700 – 1,800 feet.

Soils are broad alluvial terraces and fans of Paso Robles Creek and the Salinas River over bed rock. Alluvial soils of shallow to moderate depth and sandy to silty to clay loams interspersed with calcareous in places.

History
Templeton is located within the former Rancho Paso de Robles Mexican land grant and was founded in 1886 when Chauney Hatch Phillips of the West Coast Land Company sent R.R. Harris to survey 160 acres (0.65 km2) set aside for a town to exist south of Paso Robles as part of the companies larger purchase of 63,000 acres (250 km2). This 160 acres (0.65 km2) was to be laid out in business and residential lots with 5–12 acre parcels, with the town to be named “Crocker” after a Vice President of the Southern Pacific Railroad, Charles F. Crocker, however, Crocker instead chose to name the town “Templeton,” the name of his 2-year-old son.

The town was briefly the end of the line for passengers traveling south via the Southern Pacific Railroad from northern California; passengers disembarked at Templeton and were then carried by stagecoach south to San Luis Obispo. In 1889, the railroad was continued 14 miles (23 km) south to Santa Margarita and the town was reclassified to a flag stop. Currently, the railroad stops in nearby Paso Robles before continuing on, and Templeton is classified as a bypass.

In 1898, a fire destroyed most of the original wooden buildings of the business district along Main Street, prompting this section of the town to be rebuilt with brick, although on a somewhat smaller scale than before.

Climate
Templeton has a Mediterranean climate that is characterized by mild winters and dry summers. The area usually has low humidity. Rain generally falls only between November and March, with the rainy season tapering off almost completely by the end of April. Temperature lows can reach from 10 to 15 °F (−9 °C) in the winter, and highs reaching up to 115 °F (46 °C) in the summer.

Like much of the nearby area, Templeton occasionally receives significant but temporary fog through parts of the year. In summer, Templeton will occasionally receive fog due to its proximity with the California Coastal Range, Pacific Ocean, and the higher valley temperatures of Templeton itself; the differential in density between the warm rising air in the valley causes it to be displaced with the descent of the cooler marine air layer via the Templeton Gap in the Santa Lucia Range. Similarly, in winter, Templeton will occasionally receive morning fog due to the temperature differential with the Central Valley.

Source: Wikipedia, Appelation America