 In Delta Junction itself, but not in the nearby areas, wind blows many days from the south down the Delta River from the Gulf of Alaska, bringing river silt in the summer and snowdrifts in the winter.There are usually several days in the winter when the temperature is in the range of −40 °F/°C when a wind (known as a Chinook wind) begins to blow.A few minutes later, the temperature climbs to above the freezing mark.