Philadelphia (KPHL) Temperature Market Guide

KPHL • Philadelphia International Airport

Kalshi

Philadelphia International Airport (KPHL) offers a Kalshi temperature market in the Mid-Atlantic region. Located in the Delaware Valley with urban heat island effects, Philadelphia experiences a diverse climate with hot summers, cold winters, and impactful nor'easters.

Quick Facts

Station Code	`KPHL`
Location	Philadelphia, PA
Coordinates	39.8721°N, 75.2407°W
Elevation	36 ft (11 m)
Timezone	ET (America/New_York)
NWS Office	Philadelphia (PHI)
Resolution Source	NWS CLI Report ↗

About the KPHL Weather Station

The KPHL ASOS is located at Philadelphia International Airport in the southwestern part of the city, approximately 7 miles from downtown and adjacent to the Delaware River. At just 36 feet elevation, the station sits in the Coastal Plain.

Philadelphia Climate & Temperature Patterns

Philadelphia experiences a humid subtropical climate (Koppen: Cfa) with four distinct seasons.

Key Climate Factors:

Urban Heat Island: Philadelphia's dense urban core creates notable heat island effects.

Nor'easters: These powerful coastal storms bring heavy snow, rain, and wind.

Delaware Bay Influence: Occasionally, a sea breeze from the Delaware Bay can moderate afternoon temperatures.

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Seasonal Trading Considerations

Winter (December - February):
Cold with average highs in the upper 30s to low 40s°F. Nor'easters bring major snowstorms.

Spring (March - May):
Variable with gradual warming.

Summer (June - August):
Hot and humid with average highs in the mid-80s°F. Heat waves regularly push temperatures into the 90s.

Fall (September - November):
Pleasant with gradual cooling.

Philadelphia-Specific Trading Tips

Urban Heat Advantage: The airport often exceeds suburban temperatures during heat waves.

Nor'easter Tracks: Storm track is everything - offshore brings snow; inland brings rain.

Delaware Bay Breeze: On warm days with southerly flow, a bay breeze can develop.

Market Resolution Details

Philadelphia temperature markets on Kalshi resolve based on the official high temperature in the NWS CLI for station KPHL, issued by the Philadelphia forecast office (PHI).

Resolution Source: NWS CLI (Climatological Report)

Reporting Period: 12:00 AM to 11:59 PM Eastern Standard Time.

Data Release Schedule

Typical release times for key data products at KPHL. Times shown in UTC.

Data Type	Typical Time (UTC)	Variability
CLI Report Daily climatological summary	05:42 UTC	±11 min
24hr High METAR with max temp	04:54 UTC	±1 min
METAR Hourly observations	Hourly at :54	±1 min
DSM #1 Daily summary message	13:32 UTC	Issuance time
DSM #2 Daily summary message	21:17 UTC	Issuance time
DSM #3 Daily summary message	15:32 UTC	Issuance time

6-Hour High/Low Reports

These METARs include 6-hour maximum and minimum temperatures, useful for tracking intraday temperature trends.

05:54 UTC

11:54 UTC

17:54 UTC

23:54 UTC

Note: Times are approximate and may vary. CLI reports are the official resolution source for temperature markets. See NWS Data Guide for more information.

Data Resources

Quick links to official data sources and tools for Philadelphia.

📊 NWS Data

🗄️ Iowa Environmental Mesonet

📈 Wethr.net Tools

Forecasting Challenges

Nor'easter Tracks: Small changes in storm track dramatically change outcomes.

Heat Wave Intensity: Predicting exact heat wave peaks requires understanding subtle factors.

Historical Temperature Records

Record High: 106°F recorded in August 1918.

Record Low: -11°F recorded in February 1934.

90°F+ Days: Philadelphia averages about 25-30 days per year at or above 90°F.

📡 Official Data Sources

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