Methodology

Climate Yearbook turns daily historical weather observations from Open-Meteo into location and date based climate archive views.

Data requested

• Daily maximum temperature.
• Daily minimum temperature.
• Daily precipitation sum.
• Automatic timezone handling for the selected location.

Display processing

Daily values are fetched in Celsius and millimeters. Fahrenheit conversion happens only for display. Leap day is omitted in the chart alignment so different years can share a common day-of-year axis.

Limits

Climate Yearbook does not modify unavailable values or invent missing observations. When Open-Meteo does not return a daily value for a place and date range, the app shows that the value is unavailable.