The gradients actually serve a purpose:

- You can see the weekly high/low temperature trends by scanning down vertically along the left.

- Redder color means warmer; bluer means cooler.

- The gradient is constant for all data plots, so you can visually compare the temperature across days and hours.

- The gradient block for each day goes from the high to the low temp for that day.

- Even the hourly temperature plot line is calibrated to the same gradient.

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The sky background gradient is slightly superfluous, but it's very subtle and meant to emulate (a more vibrant) version of the actual sky.

For anyone who wants more gradients: there's a setting here: https://weather-sense.leftium.com/wmo-codes

I disabled those by default because they were distracting and didn't serve a purpose.