Travel Weather FairyData & Methodology
Travel Weather Fairy separates historical climate from live forecast data. For most cities, historical climate and recent-year calendars are frozen static copies derived from Open-Meteo historical data. Munich, Kyoto, Nagoya and the V28.0 source-specific destinations use the exceptions described below. Current weather and the 7-day forecast use MET Norway Locationforecast through our server-side proxy.
Weather data
| Item | Method | Primary source |
|---|---|---|
| Recent 10-year climate | The most recent 10 complete calendar years are aggregated by month. In 2026, the period is 2016–2025. Most cities use frozen Open-Meteo data; Munich, Kyoto, Nagoya and the V28.0 JMA-normal destinations follow the source-specific exceptions below. | Open-Meteo historical data · city-specific exceptions |
| Rainy day | For Open-Meteo cities, a day with at least 1 mm of total precipitation is counted as one rainy day. Kyoto and Nagoya use the JMA 1991–2020 normal for days with at least 1 mm; Munich uses LMU measurable-rain days >0.1 mm. | Open-Meteo · JMA · LMU, by city |
| Recent 3 years | For supported cities, daily high/low temperature, precipitation and weather codes are stored as static files for year-to-year calendar comparison. Munich, Kyoto, Nagoya and the six V28.0 additions do not show a daily recent-3-year calendar in this release because their source pipelines differ. | Open-Meteo historical data · frozen static copy |
| Current + 7-day forecast | MET Norway Locationforecast is grouped by each city’s local date. We show current conditions, humidity, wind, pressure, daily high/low temperatures and expected precipitation amount. | MET Norway Locationforecast 2.0 · CC BY 4.0 |
| Exchange rate | A simple local-currency conversion for trip planning; card, cash-exchange and service fees are not included. | Frankfurter |
MET Norway does not provide precipitation probability consistently for all global forecast locations, so we do not invent a percentage. Forecast cards show the model’s expected precipitation amount (mm). Requests go through a Cloudflare Worker proxy with an identifying User-Agent and caching, rather than directly from the visitor’s browser.
Travel Weather Score
The Travel Weather Score is a simple planning aid based on 10-year average high temperature, monthly rainfall and rainy-day frequency. It is not an official safety, tourism or weather-warning rating.
Clear-sky share is not used in the score or monthly headline metrics. A percentage derived only from daily weather codes is not equivalent to sunshine duration or the share of clear hours, so it has been removed to avoid misleading interpretation.
Events, seasons and limitations
Season labels summarize typical travel-weather patterns. Event and busy-period cards prioritize official tourism, government or event sources when available; dates and opening hours can change, so travelers should recheck the linked official source before departure. Weather values use representative city coordinates and may differ at a specific hotel, beach, mountain or station.
Licensing and updates
Historical weather data are retained with their original attribution. Forecast data are provided by MET Norway under CC BY 4.0. Forecast responses are cached according to the provider’s service guidance.
Questions or data corrections: travelweatherfairy@gmail.com
Kyoto and Nagoya exception: 2016–2025 monthly mean high/low temperature and monthly precipitation use official Japan Meteorological Agency (JMA) station statistics. Because this release does not include the full ten years of daily JMA observations, rainy-day frequency uses the JMA 1991–2020 normal for days with at least 1 mm, and the daily recent-3-year calendar is not shown for Kyoto or Nagoya. Current weather and 7-day forecasts continue to use MET Norway.
Munich exception: 2016–2025 monthly climate uses LMU Munich-Maxvorstadt city-station tables (monthly mean maximum/minimum temperature, monthly rain total, and measurable-rain days >0.1 mm). The recent-3-year section compares 2023–2025 monthly mean high/low temperature and monthly precipitation; a daily recent-3-year calendar is not shown for Munich in this release. Current weather and 7-day forecasts continue to use MET Norway.
V28.0 new-destination sources: Hanoi and Boracay use frozen 2016–2025 Open-Meteo/ERA5-derived aggregates. Hoi An uses the nearby Da Nang-area frozen 2016–2025 grid as a disclosed representative. Kobe and Yufuin use official JMA 1991–2020 climatological normals; Beppu uses nearby JMA Oita-station 1991–2020 normals as a disclosed representative. The six additions do not copy or fabricate recent-3-year daily calendars.
Open-Meteo static climate data license
Climate source: Open-Meteo Historical Weather API — CC BY 4.0
Travel Weather Fairy processed 2016–2025 source data into frozen monthly averages.
Some Japanese cities use official JMA observations or climatological normals instead. V28.0 uses 1991–2020 JMA normals for Kobe and Yufuin, and nearby Oita-station normals as the representative reference for Beppu; each affected city page states the exception.