Frequently Asked Questions

How accurate is the weather data on Weather Calendar?

Weather Calendar uses data from Open-Meteo, one of the most reliable weather APIs providing historical and forecast data from multiple meteorological sources including NOAA, ECMWF, and national weather services worldwide. Historical data has high accuracy (95%+), while forecast accuracy decreases over time (90% for 1-3 days, 70% for 7+ days).

How often is the weather data updated?

Weather data is updated every 6 hours for current conditions and daily for historical data. The system automatically fetches the latest information when you search for a new location or refresh existing data.

Can I access weather data for any city in the world?

Yes, Weather Calendar provides weather data for virtually any location worldwide with population data or significant landmarks. Simply search by city name, coordinates, or click on the interactive map to select any location.

What is heat index and why is it important for travel?

Heat index is a measure of how hot it feels when relative humidity is combined with air temperature. It's crucial for travel because it indicates actual comfort levels and potential health risks.

• • Below 80°F (27°C): Comfortable
• • 80-90°F (27-32°C): Caution - possible fatigue
• • 90-105°F (32-41°C): Extreme caution - heat exhaustion possible
• • Above 105°F (41°C): Danger - heat stroke likely

What is discomfort index and how is it calculated?

Discomfort index measures thermal comfort using temperature and humidity. It's calculated as:

Where T is temperature in Celsius and RH is relative humidity percentage.

• • Below 68: Comfortable
• • 68-75: Slightly uncomfortable
• • 75-80: Uncomfortable
• • Above 80: Very uncomfortable

How can I use Weather Calendar for travel planning?

Weather Calendar shows 12-month weather patterns for any destination, helping you:

• • Identify the best months to visit based on temperature and humidity
• • Avoid extreme heat or uncomfortable weather periods
• • Compare multiple destinations side by side
• • Plan activities based on seasonal weather patterns

What's the difference between temperature and "feels like" temperature?

"Feels like" temperature (apparent temperature) accounts for humidity, wind, and other factors that affect how hot or cold you actually feel. This is more important for travel comfort than actual air temperature. For example, 85°F (29°C) with high humidity can feel like 100°F (38°C).

Which languages does Weather Calendar support?

Weather Calendar supports 7 languages:

• • English (default)
• • Korean (한국어)
• • Chinese (中文)
• • Japanese (日本語)
• • Spanish (Español)
• • German (Deutsch)
• • French (Français)

Language can be changed in the settings or via URL parameters (e.g., ?lang=ko).

Can I use Weather Calendar offline?

Weather Calendar is designed as a Progressive Web App (PWA) with basic offline functionality. Once loaded, you can view previously accessed data without internet connection, but new weather data requires an internet connection.

Is Weather Calendar free to use?

Yes, Weather Calendar is completely free to use. There are no subscription fees, premium features, or hidden costs. We provide unlimited access to weather data for any location worldwide.

How do I install Weather Calendar as an app?

Weather Calendar supports Progressive Web App (PWA) installation:

• • Desktop: Click the install icon in your browser's address bar
• • Android: Tap "Add to Home Screen" in Chrome menu
• • iOS: Tap share button → "Add to Home Screen"