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On this site, we provide an easy-to-understand representation of the “comfort level” at each station and along each railway line.

The comfort level is determined based on the Discomfort Index, which is calculated from the temperature and relative humidity at each station.
Our weather-sign-reading cat character, Signyaru, gently expresses the atmosphere at the time through facial expressions and short messages.

<Examples of Signyaru>

About Signyaru
Signyaru has fluffy, long black fur and a cloud-like puffy body.
A bit sensitive and not a fan of rain—so when it rains, you might see a gloomy face…

Note: Comfort is subjective and may differ from person to person.
Here, “comfort level” reflects how Signyaru feels.
Please use it as a fun and lighthearted reference: “This is how Signyaru feels today!”

Also, pay attention to precipitation!
When it rains, even the smallest changes are picked up by Signyaru.

• If the precipitation is greater than 0 mm but less than 0.3 mm per 10 minutes…
  → “Feeling fidgety”
  = Not sure if you’ll need an umbrella. A slightly restless, uncertain kind of weather.

• If the precipitation is 0.3 mm or more per 10 minutes…
  → “Home feels better”
  = A steady, noticeable rain—being indoors feels much more comfortable than being outside.

Just one quick check before your commute or school trip can help you better navigate the day’s weather!

For details on the different types of “comfort levels,” please refer to the “Comfort Level Legend by Signyaru” at the bottom of the top page.

Note: The temperature, humidity, and precipitation values used to calculate the comfort level at each station are spatially interpolated from a wide range of observational data.