Halifax has a humid continental climate (Köppen "Dfb"), bordering on an oceanic climate (Cfb), with warm summers and relatively mild winters, which is due to Gulf Stream moderation. The weather is usually milder in the winter or cooler in the summer than areas at similar latitudes inland, with the temperature remaining (with occasional notable exceptions) between about . January is the coldest month, being the only month with a high that is slightly below freezing at , while August is the warmest. The sea heavily influences the climate of the area, causing significant seasonal lag in summer, with August being significantly warmer than June and with September being the third mildest month in terms of mean temperature. The January mean is only colder than the isotherm for the oceanic climate.