Standard pressure at sea level ：1013hPa
In general, low pressure leads to unsettled weather conditions and high pressure leads to settled weather conditions.
Anticyclone (high pressure)
In an area with high pressure, the winds tend to be light, and blow in a clockwise direction (for northern hemisphere). Also, the air is descending, which reduces the formation of cloud and leads to light winds and settled weather conditions.
Depression (low pressure)
In an area with low pressure, air is rising and blows in an anticlockwise direction around the low (in the northern hemisphere). As it rises and cools, water vapour condenses to form clouds and perhaps precipitation. This is why the weather in a depression is often unsettled, there are usually weather fronts associated with depressions.
Links: