Roosevelt Island Seasonal temperature break down - The average median temperature March through May is approximately 52°F with highs averaging at 63°F and lows averaging at 43°F. June through August has an approximate average median temperature of 75°F with highs averaging at 84°F, lows typically average at 67°F. Average median temperatures September through November average out at 58°F, high temperatures average out at 67°F and lows average at 49°F.
The average median temperature December through February is approximately 35°F with highs averaging at 44°F, lows average out at 28°F.
The average Roosevelt Island annual median temperature averages out at approximately 55°F. The coldest month in Roosevelt Island is January with a median temperature of 33°F, the average high for the month of January is 41°F with an average low of 24°F. The hottest month in Roosevelt Island is July with an approximate median temperature of 79°F, the average high for the month of July is 88°F with an average low of 70°F.