Calgary

Rainfall in Calgary

1. Seasonal Patterns:

   • Spring (March to May): Rainfall begins to increase in late spring, with May being one of the wetter months. Snowfall can still occur in early spring, transitioning to rain as temperatures rise.
   • Summer (June to August): This is the wettest season in Calgary, with June being the rainiest month on average. Thunderstorms are also common during this time.
   • Autumn (September to November): Rainfall decreases as the season progresses, with September still seeing some precipitation before transitioning to snow in late autumn.
   • Winter (December to February): Rainfall is minimal during winter, as precipitation primarily falls as snow.

2. Average Rainfall Levels:

   • Calgary receives an average of 300-400 mm (12-16 inches) of precipitation annually, with the majority falling between May and August.
   • Rainfall is generally moderate, but short, intense downpours can occur during summer thunderstorms.

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Storms in Calgary

1. Types of Storms:

   • Thunderstorms: Most common in late spring and summer, often accompanied by heavy rain, hail, strong winds, and occasional lightning.
   • Hailstorms: Calgary is located in "Hailstorm Alley," making it one of the most hail-prone regions in Canada. Hailstorms are frequent in summer, particularly in June and July.
   • Chinook Winds: While not a storm, these warm, dry winds can cause rapid temperature fluctuations in winter and early spring, leading to melting snow and potential localized flooding.
   • Snowstorms: Heavy snowfalls and blizzards can occur in late autumn, winter, and early spring, sometimes disrupting transportation and daily activities.

2. Risks and Challenges:

   • Flooding: Intense summer rainstorms or rapid snowmelt from Chinook winds can lead to localized flooding, especially in low-lying areas near rivers.
   • Hail Damage: Hailstorms can cause significant damage to vehicles, roofs, windows, and crops. Calgary has experienced some of the costliest hailstorms in Canadian history.
   • Lightning: Thunderstorms bring lightning, which poses risks to outdoor activities and can occasionally cause power outages or fires.
   • Wind Damage: Strong winds during storms can uproot trees, damage structures, and create hazardous conditions for pedestrians and drivers.

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Precautions and Protocols

1. General Preparedness:

   • Storm-Proofing Homes:
     • Install hail-resistant roofing materials (e.g., asphalt shingles or metal roofing).
     • Reinforce windows with storm shutters or impact-resistant glass.
     • Ensure proper drainage around your home to prevent water pooling during heavy rain.
     • Costs for storm-proofing can range from $5,000 to $20,000 CAD, depending on the extent of upgrades.
   • Emergency Kits:
     • Keep a 72-hour emergency kit with essentials like water, non-perishable food, flashlights, batteries, and a first-aid kit.
   • Insurance:
     • Ensure your home and vehicle insurance policies cover hail, flooding, and wind damage. Premiums may be higher in Calgary due to the frequency of hailstorms.

2. During Stormy Weather:

   • Thunderstorms:
     • Avoid outdoor activities during lightning storms.
     • Stay indoors and away from windows.
     • Unplug electronics to prevent damage from power surges.
   • Hailstorms:
     • Park vehicles in garages or under covered areas to prevent hail damage.
     • Seek shelter indoors and avoid being outside during hailstorms.
   • Flooding:
     • Avoid driving or walking through flooded areas, as water depth and currents can be deceptive.
     • Monitor local weather alerts and evacuation notices.
   • Snowstorms:
     • Stay off the roads during heavy snowfalls unless absolutely necessary.
     • Keep sidewalks and driveways clear of snow to prevent ice buildup.

3. Local Protocols:

   • Calgary has an efficient emergency alert system that provides real-time updates on severe weather. Sign up for alerts through the Alberta Emergency Alert system or download weather apps like The Weather Network or Environment Canada.
   • The city also has flood mitigation infrastructure, such as the Glenmore Reservoir and flood barriers, to manage water levels during heavy rainfall.

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Geographical Considerations

1. Areas More Affected:

   • Flood-Prone Areas:
     • Communities near the Bow and Elbow Rivers, such as Mission, Sunnyside, and Bowness, are more susceptible to flooding during heavy rain or rapid snowmelt.
   • Hail-Prone Areas:
     • Hailstorms can affect the entire city, but areas with less tree cover or older infrastructure may experience more damage.
   • Wind-Prone Areas:
     • Open areas and neighborhoods on the outskirts of the city may experience stronger winds during storms.

2. Local Geography:

   • Calgary's location at the foothills of the Rocky Mountains contributes to its unpredictable weather. The mountains can cause sudden changes in temperature and precipitation, so always be prepared for rapid weather shifts.

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Costs and Considerations

1. Storm-Proofing Costs:

   • Hail-resistant roofing: $10,000 to $20,000 CAD (depending on the size of the home).
   • Storm shutters: $2,000 to $5,000 CAD.
   • Sump pump installation (to prevent basement flooding): $1,000 to $3,000 CAD.
   • Flood barriers or sandbags: $50 to $500 CAD, depending on the size and type.

2. Insurance Costs:

   • Home insurance premiums in Calgary typically range from $800 to $2,000 CAD annually, depending on coverage and location.
   • Vehicle insurance may also be higher due to hail risks, with premiums averaging $1,200 to $2,500 CAD annually.

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Final Tips

• Always check the weather forecast before planning outdoor activities, especially in summer when thunderstorms can develop quickly.
• If you’re moving to Calgary, consider investing in storm-resistant infrastructure and insurance to protect your property.
• Familiarize yourself with local emergency resources, such as the City of Calgary’s website and Alberta Emergency Alert, to stay informed during severe weather events.

By understanding Calgary’s rainfall and storm patterns and taking proactive measures, you can navigate the city’s weather challenges with confidence and safety.