Static Radar; Animated Radar Loop; Warnings/Advisories; NowCast (Regional Conditions) Yearly Climate Averages; Menu. April in Oxford, Connecticut, is a mild spring month, with temperature in the range of an average high of 56.7°F and an average low of 39.7°F. Temperature The arrival of April sees a shift in the average high-temperature, moving from a frosty 44.2°F in March to a moderate 56.7°F.