In January 2018, fuel in Latvia averaged €1.230 for petrol

Petrol, monthly average€1.230/L
Diesel, monthly average€1.136/L
LPG, monthly average€0.546/L
Weekly bulletins held for January 20185

Monthly averages for Latvia across January 2018, from the stored EU Weekly Oil Bulletin monthly history (European Commission, CC BY 4.0).