Jacksonville (KJAX) Temperature Market Guide
KJAX • Jacksonville International Airport
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Jacksonville International Airport (KJAX) offers a ForecastEx temperature market in Northeast Florida. As the northernmost major Florida market, Jacksonville experiences a more variable climate than South Florida, with occasional winter cold and more pronounced seasonal variation. The Atlantic sea breeze and proximity to the Georgia border create unique trading dynamics.
Quick Facts
| Station Code | KJAX |
|---|---|
| Location | Jacksonville, FL |
| Coordinates | 30.4941°N, 81.6879°W |
| Elevation | 30 ft (9 m) |
| Timezone | ET (America/New_York) |
| NWS Office | Jacksonville (JAX) |
| Resolution Source | NWS CLI Report ↗ |
About the KJAX Weather Station
The KJAX ASOS is located at Jacksonville International Airport, approximately 13 miles north of downtown Jacksonville. At just 30 feet elevation, the station sits on the coastal plain about 15 miles from the Atlantic Ocean.
The airport's position north of the urban core and slightly inland means it may experience different conditions than downtown or the beaches. It's also close enough to Georgia to be affected by continental air masses more than South Florida stations.
The airport's position north of the urban core and slightly inland means it may experience different conditions than downtown or the beaches. It's also close enough to Georgia to be affected by continental air masses more than South Florida stations.
Jacksonville Climate & Temperature Patterns
Jacksonville experiences a humid subtropical climate (Koppen: Cfa) that's transitional between the Deep South and tropical Florida. Winters are milder than Georgia but cooler than Miami.
Key Climate Factors:
Atlantic Sea Breeze: The sea breeze develops most warm season afternoons, often reaching the airport by mid-afternoon. This can limit high temperatures compared to inland areas.
Northern Florida Position: Jacksonville is far enough north to receive occasional significant cold air intrusions. Freezes occur several times per winter.
Summer Thunderstorms: Florida's sea breeze convergence zones create frequent summer afternoon thunderstorms.
Key Climate Factors:
Atlantic Sea Breeze: The sea breeze develops most warm season afternoons, often reaching the airport by mid-afternoon. This can limit high temperatures compared to inland areas.
Northern Florida Position: Jacksonville is far enough north to receive occasional significant cold air intrusions. Freezes occur several times per winter.
Summer Thunderstorms: Florida's sea breeze convergence zones create frequent summer afternoon thunderstorms.
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Open Live DashboardSeasonal Trading Considerations
Winter (December - February):
Mild overall with average highs in the low-to-mid 60s°F. Cold fronts bring notable temperature drops, with occasional freezing temperatures. More variable than South Florida.
Spring (March - May):
Pleasant with gradually warming temperatures. Sea breeze becomes more prominent. Severe weather is possible.
Summer (June - August):
Hot and humid with average highs in the low 90s°F. Daily afternoon thunderstorms are expected. Sea breeze provides some coastal cooling.
Fall (September - November):
Hurricane season peaks in September. Otherwise pleasant with gradual cooling. Cold fronts return by October.
Mild overall with average highs in the low-to-mid 60s°F. Cold fronts bring notable temperature drops, with occasional freezing temperatures. More variable than South Florida.
Spring (March - May):
Pleasant with gradually warming temperatures. Sea breeze becomes more prominent. Severe weather is possible.
Summer (June - August):
Hot and humid with average highs in the low 90s°F. Daily afternoon thunderstorms are expected. Sea breeze provides some coastal cooling.
Fall (September - November):
Hurricane season peaks in September. Otherwise pleasant with gradual cooling. Cold fronts return by October.
Jacksonville-Specific Trading Tips
Sea Breeze Timing: The Atlantic sea breeze typically reaches the airport by mid-to-late afternoon on summer days. Earlier or stronger sea breeze development limits high temperatures.
Cold Front Impacts: Unlike South Florida, Jacksonville experiences meaningful temperature drops with cold fronts. Winter cold fronts can bring highs only in the 50s°F.
Thunderstorm Coverage: Summer storms are nearly daily but location varies. Storms forming on the sea breeze front often affect the airport.
Cold Front Impacts: Unlike South Florida, Jacksonville experiences meaningful temperature drops with cold fronts. Winter cold fronts can bring highs only in the 50s°F.
Thunderstorm Coverage: Summer storms are nearly daily but location varies. Storms forming on the sea breeze front often affect the airport.
Market Resolution Details
Jacksonville temperature markets resolve based on the official high temperature in the NWS CLI for station KJAX, issued by the Jacksonville forecast office (JAX).
Resolution Source: NWS CLI (Climatological Report)
Reporting Period: 12:00 AM to 11:59 PM Eastern Standard Time.
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 KJAX. Times shown in UTC.
| Data Type | Typical Time (UTC) | Variability |
|---|---|---|
| CLI Report Daily climatological summary |
06:30 UTC | ±3 min |
| 24hr High METAR with max temp |
04:56 UTC | ±1 min |
| METAR Hourly observations |
Hourly at :56 | ±1 min |
| DSM #1 Daily summary message |
21:12 UTC | Issuance time |
| DSM #2 Daily summary message |
22:12 UTC | Issuance time |
6-Hour High/Low Reports
These METARs include 6-hour maximum and minimum temperatures, useful for tracking intraday temperature trends.
05:56 UTC
11:56 UTC
17:56 UTC
23:56 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 Jacksonville.
📊 NWS Data
🗄️ Iowa Environmental Mesonet
📈 Wethr.net Tools
Forecasting Challenges
Sea Breeze Prediction: The timing and inland extent of the sea breeze affects temperatures but is difficult to predict precisely.
Thunderstorm Initiation: Where and when sea breeze thunderstorms develop is challenging to forecast.
Cold Air Penetration: How far south cold air will penetrate on any given cold front creates uncertainty.
Thunderstorm Initiation: Where and when sea breeze thunderstorms develop is challenging to forecast.
Cold Air Penetration: How far south cold air will penetrate on any given cold front creates uncertainty.
Historical Temperature Records
Record High: 104°F recorded in July 1942.
Record Low: 7°F recorded in January 1985.
90°F+ Days: Jacksonville averages about 80-85 days per year at or above 90°F.
Freeze Events: Jacksonville experiences about 10-15 nights per year at or below 32°F.
Record Low: 7°F recorded in January 1985.
90°F+ Days: Jacksonville averages about 80-85 days per year at or above 90°F.
Freeze Events: Jacksonville experiences about 10-15 nights per year at or below 32°F.
📡 Official Data Sources
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