The Rancho Cucamonga climograph shows that the average annual temperature is 78°F with most precipitation occurring in winter. The climate is classified as Bwh, which refers to a subtropical desert with little rain and large daily temperature fluctuations. Regions with this climate typically experience low humidity, low rainfall, high average temperatures, and high daily temperature variations.

1. Rancho Cucamonga Climograph
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Average Precipitation
Average Temperature
Average Annual Temperature 78° F
Average Annual Precipitation 1.26 Inches
Precipitation: Winter Concentration
Climate Type: Bwh Subtropical Desert
B Climates are characterized by little rain and a large daily temperature range. The letter
W in the climate description refers to a dry, arid type desert. The letter H in the climate
description is used to describe where this climate zone is located, which is in the
subtropics. This climate type covers 12 percent of all land area on the continents.
Regions with this climate typically have: low humidity, low precipitation, little cloud
cover, high average annual temperatures, high daily temperature ranges, and high wind
velocities.
Sources
http://www.physicalgeography.net/fundamentals/7v.html
http://www.blueplanetbiomes.org/climate.htm