Lack of moisture in deserts and low temperatures in Polar Regions slow down chemical weathering. Rocks containing minerals with low hardness undergo mechanical weathering more easily. Rocks containing minerals with low hardness have a more difficult time with mechanical weathering. A cold, dry climate will produce the lowest rate of weathering. A warm, wet climate will produce the highest rate of weathering. The warmer a climate is, the more types of vegetation it will have and the greater the rate of biological weathering. Chemical weathering is more likely to occur and to be more effective in humid tropical climates, and disintegration of rock from freeze thaw cycles is more likely to take place and to be more effective in sub-Arctic climates

I think that the slow development of chemical weather relates closely to its associated weather sysems, the time scale of which is usually larger than that of warm weather systems such as tropical cyclones.

Dear Dr Lei Ming Ma thank you for your contribution to the discussion

Most types of weathering are slower in cold, dry places. Rocks containing minerals with low hardness undergo mechanical weathering more easily. Rocks containing minerals with low hardness have a more difficult time with mechanical weathering. Most types of weathering are faster in cold, dry places. Weathering occurs very slowly in hot and dry climates. Without temperature changes, ice wedging cannot occur. In very cold, dry areas, there is little weathering. Physical weathering takes place when solid rocks are broken into fragments with little or no chemical change in the rock itself. Only physical weathering occurs in very cold, dry or very hot, dry climates and splitting is largely due to insulation. Rate of weathering depends on temperature and moisture. Cold dry places have less water to weather things. This specific process is frost weathering or cry fracturing. Temperature changes can also contribute to mechanical weathering in a process called thermal stress. Changes in temperature cause rock to expand (with heat) and contract. Due to the temperature because there is high temperatures and greater snow fall increase the rate of chemical weathering. Weathering occurs when rocks and soils breakdown due to interaction with the environment. Polar Regions have low annual precipitation, extremely cold temperatures, and no higher-order plants. Thus, the extent of chemical weathering in Polar Regions is generally thought to be negligible. Moisture speeds up chemical weathering. Weathering occurs fastest in hot, wet climates. It occurs very slowly in hot and dry climates. Chemical weathering proceeds more slowly in deserts compared to more humid climates because of the lack of water. Even mechanical weathering is slowed, because of a lack of runoff and even a lack of moisture to perform ice wedging. Chemical weathering is more dominant in the area of humid climate.