This is a wwell knomn problem for airlines flying a lot in cold conditions. A flight in January from scandinavia to say Milano with fuel already below 0deg C when fueling and after a 2 1/2 hour flight the fuel in the wing tanks is sometimes as low as -20deg C. Upon arrival in Milano with say 5-10 deg OAT and drizzle will certainly give you a problem especially if you are carrying some extra fuel. Try to find a de-icing crew who is ready to de-ice one aircraft per day.
Clear ice is a serious problem for F-100, DC-9,MD-80 aircraft.
After having seen this fenomenon many times I can say that it often is not enough with just fueling up the aircraft, as is the case on your return flight when the fuel uplifted in scandinavia is below or just above freezing.
The first aircraft to have warm fuel return to tank from the oilcoolers was as far as I know the MD-90, the larger sister of the MD-95 (B-717).
Merry Christmas to you all.