K

Katabatic – wind blowing down an incline, such as down a hillside; downslope wind.

Katafront – a front (usually a cold front) at which the warm air descents the frontal surface.

Killing frost – frost severe enough to end the growing season. This usually occurs at temperatures below 28 degrees Fahrenheit. In Canada, a killing frost is described as a frost severe enough to destroy annual plants and new growth on trees (in the spring) or to end the growing season (in the fall).

Knot – a measure of speed. It is one nautical mile per hour (1.15 miles per hour). A nautical mile is one minute of one degree of latitude.