increased possibility of frost at ground level. Vegetation structure and plant diversity Vegetation and its structure has a significant impact on microclimates A microclimate (or micro-climate) refers to localized atmospheric conditions in the near-surface layer, which includes the air immediately above a surface as well as the shallow soil and water environments below it. A microclimate can range in size from a few meters to at most a few kilometers across. It is characterized by a set of persistent, measurable differences in the climate conditions from Topography Changes in terrain such as elevation changes or depressions can strongly influence the development of microclimates by altering sun exposure, wind patterns, and air pooling. Another contributing factor of microclimate is the slope or aspect of an area. South-facing slopes in the Northern Hemisphere and north-facing slopes in the Southern Hemisphere are exposed to more direct sunlight than opposite slopes and are therefore warmer for longer periods of time, giving the slope a warmer microclimate than the areas around the slope. The lowest area of a glen may sometimes frost sooner or harder than a nearby spot uphill, because cold air sinks, a drying breeze may not reach the lowest bottom, and humidity lingers and precipitates, then freezes. Land and water mass distribution Large bodies of water can influence microclimates by lowering the surrounding air temperature and increasing humidity. Soil properties The soil composition makeup affect microclimates through its ability to store heat and moisture. Soils made of components that retain moisture tend to moderate temperature fluctuations while soils made of components which dry easily produce higher daily temperature changes. The type of soil found in an area can also affect microclimates. For example, soils heavy in clay, retain heat and moisture which moderates the near ground temperature and humidity. On the other hand, if soil has many air pockets, the South-facing slopes in the Northern Hemisphere and north-facing slopes in the Southern Hemisphere are exposed to more direct sunlight than opposite slopes and are therefore warmer for longer periods of time, giving the slope a warmer microclimate than the areas around the slope. The lowest area of a glen may sometimes Vegetation structure and plant diversity Vegetation and its structure has a significant impact on microclimates by modifying solar radiation and shading, blocking wind flow and supporting moisture retention. As pointed out by meteorologist Rudolf Geiger, not only does climate influence the living plant, but the opposite effect of the interaction of plants on their environment can also take place, which is ultimately known as plant climate. Plant diversity can further impact the microclimate by creating variety in the canopy structure and transpiration rates. This produces measurable differences in temperature and humidity. Human-made structures The physical features and properties of the built environment such as the building form, layout and surface materials can impact the surrounding temperature, humidity, and wind patterns by changing air flow, shading and heat storage. Urban areas often develop microclimates which are warmer than the surrounding region. This is the result of the use of building materials like concrete and asphalt, which absorb and store heat, while building mass reduces airflow and wind patterns. All of this has a considerable impact on the local microclimate. See also urban microclimates in the examples section. Human activities, such as land use and urban development, can further influence the environmental responses of a microclimate, shaping how climate change impacts the environment. Urban heat islands are a direct example of how human influences can amplify the conditions which affect climate change in an area, correlating to impacts on the environment and society. Reforestation efforts Environmental damage caused by natural and human-made disturbances can be mitigated through an understanding of microclimates. Microclimate conditions such as shade, moisture, and temperature influence seedling survival, growth and ecosystem recovery. These localized environmental conditions can improve the success of reforestation and ecological restoration efforts. Energy demand Building energy consumption is influenced by the surrounding microclimate, particularly local variations in temperature and humidity. In densely built environments, increased building mass, reduced vegetation and concrete surfaces can raise local temperature and increase cooling demand. Modeling the interaction between buildings and microclimates can improve urban planning and building design, helping to reduce energy consumption and improve efficiency. This is the case in places such as British Columbia, where Vancouver has an oceanic wet winter with rare frosts, but inland areas that average several degrees warmer in summer have cold and snowy winters. === Craters === The presence of permafrost close to the surface in a crater creates a unique microclimate environment. === Caves === Caves are important geologic formations that can house unique and delicate geologic/biological environments. The vast majority of caves found are made of calcium carbonates such as limestone. In these dissolution environments, many species of flora and fauna find home. It is known among locals that some boroughs such as the northern and western suburbs are among the coldest in the city, and can be experiencing frost or snow whilst other warmer districts such as the city centre can be at much warmer temperatures at the same time. Sydney, Australia, has a microclimate occurring prominently in the warmer months. Inland, in Sydney's western suburbs, the climate is drier and significantly hotter with temperatures generally around 3–7 °C (5–13 °F) above Sydney CBD and Eastern Suburbs (the coast), as sea breezes do not penetrate further inland.