About Coquitlam Weather
Our Mission and Purpose
Coquitlam Weather exists to provide residents, visitors, and researchers with detailed, accurate climate information specific to Coquitlam, British Columbia. This city of 148,000 people experiences unique weather patterns influenced by its position in the Lower Mainland, between the Pacific Ocean and Coast Mountains. While general forecasts cover the broader Vancouver region, Coquitlam's elevation variations and geographic position create microclimates that deserve focused attention.
We compile data from Environment and Climate Change Canada's official weather stations, historical climate records dating back to 1971, and peer-reviewed meteorological research. Our goal is to present this information in accessible formats that help people understand not just what the weather is doing today, but why it behaves the way it does and how patterns are changing over time. The climate crisis makes this work increasingly important as residents need reliable information to prepare for more frequent extreme weather events.
Unlike generic weather sites that provide basic forecasts, we focus on the specific factors that make Coquitlam's weather distinctive—the rain shadow effects from Vancouver Island, orographic precipitation on the northern slopes, temperature inversions in river valleys, and the growing impact of atmospheric rivers. Our main page breaks down these patterns with detailed seasonal data, while our FAQ section answers the specific questions locals and visitors ask most frequently about conditions in different neighborhoods.
This resource serves gardeners planning their growing seasons, outdoor enthusiasts choosing the best times for activities, newcomers learning what to expect from their new home, and long-time residents noticing how weather patterns have shifted over the decades. We believe informed communities are better prepared for whatever weather comes their way.
| City | Annual Precip (mm) | Jan Avg (°C) | Jul Avg (°C) | Annual Snow (cm) |
|---|---|---|---|---|
| Coquitlam | 1,520 | 3 | 18 | 25 |
| Vancouver | 1,189 | 4 | 18 | 11 |
| Victoria | 608 | 5 | 16 | 3 |
| Abbotsford | 1,470 | 3 | 19 | 35 |
| Whistler | 1,180 | -3 | 15 | 440 |
| Kelowna | 386 | -2 | 21 | 89 |
Data Sources and Methodology
Our climate data comes primarily from Environment and Climate Change Canada, which operates weather stations throughout the Lower Mainland including locations in and near Coquitlam. The primary station used for historical records is the Coquitlam Lake station, which has collected continuous data since 1971. We supplement this with data from nearby stations in Port Coquitlam, Pitt Meadows, and Burnaby to provide comprehensive coverage of microclimates across the city.
Temperature and precipitation records undergo quality control procedures before publication. We identify outliers, check for instrument errors, and compare readings across multiple stations to ensure accuracy. When historical data has gaps—common in older records—we note these limitations rather than interpolating values that might mislead users. All extreme weather events mentioned on our site are verified against official Environment Canada records and cross-referenced with contemporary news reports from the period.
Climate trend analysis uses standard meteorological practices, comparing 30-year normal periods as defined by the World Meteorological Organization. When we state that temperatures have increased 0.8°C, this reflects comparison between the 1971-2000 baseline period and 2001-2020 data. We calculate seasonal averages, extreme value statistics, and return periods using established statistical methods documented by the National Oceanic and Atmospheric Administration and other meteorological authorities.
Future climate projections cited on this site come from peer-reviewed sources including the Pacific Climate Impacts Consortium and the University of Washington's Climate Impacts Group. We present ranges rather than single values to reflect model uncertainty, and we clearly distinguish between observed historical data and projected future conditions. Our commitment to transparency means every significant claim links to authoritative sources where users can verify information and explore topics in greater depth.
| Station Name | Active Since | Elevation (m) | Primary Measurements | Data Gaps |
|---|---|---|---|---|
| Coquitlam Lake | 1971 | 162 | Temp, Precip, Snow | 1989-1991 |
| Port Coquitlam | 1994 | 25 | Temp, Precip | None |
| Pitt Meadows | 1987 | 5 | Temp, Precip, Wind | 2003-2004 |
| Burnaby Simon Fraser | 1966 | 365 | Temp, Precip | 1976-1978 |
Understanding Climate Change in Coquitlam
Climate change is transforming Coquitlam's weather patterns in measurable ways. Average annual temperatures have risen 0.8°C since 1971, with winter warming of 1.1°C outpacing summer increases of 0.6°C. This might seem modest, but these changes drive significant impacts: earlier snowmelt in local watersheds, extended growing seasons, more frequent heat waves, and intensified precipitation events. The catastrophic June 2021 heat dome, which pushed temperatures to 38.4°C, demonstrated how quickly extreme events can exceed historical norms.
Precipitation patterns are shifting from steady winter rains toward more intense, sporadic events. Analysis of Environment Canada data shows that days with rainfall exceeding 50 millimeters increased from 2.8 per year during 1980-2000 to 3.9 per year during 2001-2023. Meanwhile, total rainy days decreased slightly, meaning the same annual precipitation falls in shorter, heavier bursts. This pattern stresses urban drainage systems and increases flood risks, as the November 2021 atmospheric river event demonstrated across the Lower Mainland.
Looking ahead, climate models project Coquitlam will warm an additional 2.0-2.5°C by 2050 under moderate emissions scenarios. Summer days above 25°C could increase from 35 currently to 55-65 annually. Winter precipitation may increase 10-15%, but more will fall as rain rather than snow, even at higher elevations. These changes will affect everything from energy consumption for cooling to ecosystem health in local parks and watersheds. The Pacific Climate Impacts Consortium provides detailed regional projections that inform municipal planning.
Adaptation requires understanding these trends. Our main page provides current climate data and historical context, while our FAQ section addresses specific questions about seasonal changes and neighborhood variations. By tracking how weather patterns evolve, residents and planners can make informed decisions about infrastructure, landscaping, emergency preparedness, and daily activities. Climate change is not a distant future threat—it is actively reshaping Coquitlam's weather right now.
| Metric | 1971-2000 | 2001-2020 | 2050 Projection | Change |
|---|---|---|---|---|
| Annual Avg Temp (°C) | 9.8 | 10.6 | 12.3 | +2.5 |
| Days >30°C | 2.1 | 4.8 | 9.5 | +7.4 |
| Winter Precip (mm) | 468 | 484 | 525 | +57 |
| Annual Snow (cm) | 28 | 22 | 12 | -16 |
| Growing Season (days) | 192 | 210 | 235 | +43 |
| Extreme Rain Events | 2.8 | 3.9 | 5.2 | +2.4 |