Like much of Metro Vancouver, Coquitlam has an oceanic climate , enjoying mild temperatures and sufficient precipitation; warm/dry summers and wet/cool winters. However, unlike other cities in the area, precipitation is especially heavy in Coquitlam due to its proximity to the mountain slopes. With westward air moving off the Pacific Ocean, the air is forced to flow up the Coast Mountains causing it to cool and condense and fall as precipitation, this process is known as orographic precipitation. The orographic effect is mainly responsible for the massive 1,969 mm (77.5 in) annual average precipitation that Coquitlam receives each year, with most falling as rainfall in the fall and winter months, with 316 mm (12.4 in) in November; the summer is usually sunny with minimal precipitation with 60.7 mm (2.39 in) in July. Although the mild temperatures allow for mostly rain to fall during the winter months, occasionally snow will fall. With a slightly higher elevation compared to the rest of Metro Vancouver, Coquitlam receives an average of 64.4 cm (25.4 in) of snow each year, with it rarely staying on the ground for a few days, adding to a very intermittent snow cover during the winter season.
Coquitlam is also located in one of the warmest regions in Canada where average mean annual temperature is 10.2 °C (50.4 °F). Temperatures are warm during the summer months with an average high of 22.7 °C (72.9 °F), and an average low of 13.4 °C (56.1 °F) in August. During the winter months, the average high is 5.6 °C (42.1 °F), and the average low is 0.9 °C (33.6 °F) in December. This relatively mild climate, by Canadian standards, is caused by the warm Alaska Current offshore and the many mountain ranges preventing the cold arctic air from the rest of Canada from reaching the southwest corner of British Columbia.
Coquitlam is situated some 10 to 15 km (6.2 to 9.3 mi) east of Vancouver, where the Coquitlam River connects with the Fraser River and extends northeast along the Pitt River toward the Coquitlam and Pitt lakes. Coquitlam borders Burnaby and Port Moody to the west, New Westminster to the southwest, and Port Coquitlam to the southeast.
City of Coquitlam. Official city site. Includes information on municipal government, transportation, employment, leisure activities, schedules, community services, and parks.