Although Incheon has a continental climate, it does enjoy some elements of an oceanic climate given its proximity to the sea (e.g. relatively more stable annual temperature range compared to other inland areas). The annual average temperature hovers around 12.1℃ - all-time high temperature was 38.9℃ (recorded on August 16, 1949), all-time low temperature was -21.0℃ (January 11, 1931). Incheon receives roughly 1,234.4mm in annual precipitation, which is less than other areas at similar latitudes. Annual average wind speed is 2.9m/s, which mainly blows in from the north-northwest, and from the north or northwest to a lesser degree. Wind speed picks up the most between February and April, and dies down in September. Incheon is prone to long stretches of what is known as the "Yellow Dust" phenomenon. High pressure in central China pushes sand and dust from mainland China towards the Korean peninsula. Combined with heavy fog generated from the Yellow Sea, yellow dust often leads to lower daytime temperatures. In total, Incheon has 49.4 fog days, of which 64% occur between April and July.