One might find round dial-type Celsius thermometers being sold by the cross-country ski wax manufacturers Swix or Toko.  They probably have websites.
 
In most xc ski resorts there are such thermometers on the wall outside to aid in selecting the proper grip wax.  The ones I have seen are in C with small F inside.  But they also include broad blue, green, red, and yellow bands to correspond to wax colors, and thus  may not be too appealing visually to everyone.  They are about 30 cm in diameter.
 
HARRY WYETH

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