Celsius 417

Normal Sudoku rules apply.

Digits that appear in the same relative position in Boxes 1 through 9 must not contain the same digit.

A clue outside the grid shows the sum along the diagonal indicated. Digits may repeat along the diagonal if permitted by other rules.

Digits in a cage sum to the digit in the cage's top left corner. Digits cannot repeat within a cage.

Along a thermometer, digits increase from the bulb end.