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Deviant Weather User Guide
Discover how today's weather deviates from historical norms with detailed temperature analysis and trends.
Table of Contents
1
Basic Usage
How do I add locations to the app?
Tap the "+" button in the top toolbar. Enter a city name or address. Select the desired location from search results. You can add up to 6 locations total.
How do I manage my saved locations?
Swipe left on a location to delete. Tap a location to view detailed weather. Favorite locations appear at the top of the list.
2
Understanding Temperature Deviance
What is temperature deviance?
Temperature deviance shows how much the current temperature differs from the historical normal for that location, date, and time. A positive deviance (shown in red) means it's warmer than normal, while a negative deviance (shown in blue) means it's cooler than normal. The intensity of the color indicates how significant the difference is.
How is deviance calculated?
The app compares the current temperature to historical normals from NOAA's climate database. For example, if it's currently 75°F and the historical normal is 70°F, the deviance would be +5°F (warmer). The color intensity changes at specific thresholds: Light (0-5°), Medium (5-10°), Strong (>10°).
3
Weather Data
Where does the weather data come from?
Current weather: Apple WeatherKit for real-time updates and local forecasts. Historical data: NOAA (National Oceanic and Atmospheric Administration).
What time period do the historical normals cover?
The historical normals are based on NOAA's U.S. Climate Normals from 1981-2010. These are 30-year averages including daily temperature normals, monthly averages, and hourly normals for temperature, precipitation, and other weather conditions.
How often is the data updated?
Current conditions: Every 5 minutes. Historical normals: Daily updates. Monthly climate data: Weekly refresh.
4
Features and Display
What do the different chart colors mean?
Red: Temperatures above historical normals. Blue: Temperatures below historical normals. Gray (dashed): Historical normal line.
Can I get weather alerts?
Yes, the app displays official National Weather Service alerts for your saved locations. Alerts are color-coded by severity: Red (Severe warnings), Orange (Warnings), Yellow (Watches), Blue (Advisories).
5
Settings and Preferences
What unit options are available?
Temperature: Celsius/Fahrenheit. Wind Speed: km/h or mph. Pressure: mb or inHg. Visibility: km or mi.
6
Troubleshooting
What should I do if weather data won't load?
Check your internet connection. Ensure Location Services are enabled. Pull down to manually refresh. The app will use cached data as a fallback until fresh data can be loaded.
How is my privacy protected?
Location data is used only for weather forecasts. No data is shared with third parties. Locations can be entered manually instead of using GPS. All settings and favorites are stored locally on your device.