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  Temperate Region - Summary Explanatory Descriptions of Main Climate Types  

Maritime West Margin European type-mid latitude 35 to 55 degrees
Relatively mild temperatures average seasonal range 5 20 degrees Centigrade
# humidity is generally relatively high and precipitation occurs all the year round
# average amount 600 mm. but significantly higher over upland areas e.g. Welsh. Uplands in the face of the prevailing moist westerly winds coming off the ocean but conversely low in rainfall shadow areas e.g. lowland East Anglia.
# The temperatures and precipitation are mainly influenced by the mid latitude position, low pressure belt and the mild westerly prevailing winds which are warmed by warm currents on the west margin of land masses e.g. the Gulf Stream and California Current.
# The weather is strongly influenced by the position of the Polar Front and the passage of westerly moving depressions along it with intervening spells of anticyclonic conditions. These are linked to the position and extent of the main air masses influencing the continental west margins in mid latitudes i.e. the Polar Continental, Polar Maritime, Arctic Maritime, Tropical Maritime and Tropical Continental Air Masses

  Air Masses affecting the U.K.  

  The characteristics air masses that affect the U.K.  

  Source: Waugh  
  # The interaction between these air masses along the Polar Front together the associated upper air Jet Stream and Rossby waves influence the occurrence and development of depressions along the Polar front.
# Persistence of one of the continental air masses across these western margins can bring long spells of dry summer weather but in winter 'anticyclonic gloom' conditions may occur.
# In contrast the passage over the area of a deep fast moving depression can bring storm conditions with gale force winds and heavy rainfall.

Continental Interior type mid latitude 35 55 degrees
The Continental type is marked by a large seasonal range of temperature averaging 25 to 5 degrees centigrade but towards the latitude margins extremes are greater than this.
# Winters are dominated by the continental high pressure with subsiding air and light precipitation usually snowfall.
# Winds are out blowing and the interior is too remote and cut off from moderating maritime influences.
# In the summers occasioned by the higher angle of the sun and longer daylight hours together with the differential heating of the land compared to the oceans, temperatures are warm 25 to 35 degrees.

  Distribution of Continental Interior type Climate  

  # Low pressure conditions allow the incursion of the occasional depression and convectional rainfall but the average precipitation is moderate around 400mms.
# Intermontane basins may be cut off from incoming depressions leading to temperate desert conditions as in the Gobi Desert of Central Asia and the Great Basin in the Western United States. Here climatic conditions are similar to the hot deserts but the seasonal range of temperature is greater, on average 0 degrees to 35 degrees Centigrade.

East Margin Maritime latitude 35 55 degrees e.g. North East United States, Japan, South East Australia.
# Low pressure generally prevails and temperature on average range from 30 degrees to 0 degrees centigrade
# precipitation occurs all the year round but tends to a summer maximum - average annual amount around 600 mm.
# summer inward deflection of prevailing winds along ocean margins brings the area under some depressions
# relatively high humidity in summer.

  Cool and Warm Temperate Eastern Margin Climates  

  # But winters are influenced by the cold continental interior conditions conveyed by winds coming from the interior temperatures also lowered in the more northerly latitudes by cold currents off shore
# occasional incursion of depressions in winter can bring heavy snowfall in the higher latitudes.
  Temperate Climates Dustbin Game: note down the key labels for each bin or see how many you can remember!  

Click here for full screen version

  Source: http://classtools.net/widgets/dustbin_2/3Xt5V.htm  

Main basic influences on Temperate Region climates are


1. Mid latitude position.

2. Generally under influence of the mid latitude low pressure belt and the atmospheric conditions along the Polar Front and the influence of the upper jet stream except for continental areas in winter.

3. Seasonal shift of the pressure and wind belts.

4. The position and interaction at the margins of the different air masses affecting areas in temperate latitudes.

5. Differential heating of the continental interior and ocean margins.

6. The effects of ocean currents and the air above these.

7. Location of upland ranges vis-a-vis prevailing winds (eg Relief Rainfall and rain shadow)

  Match-Up Quiz: Click the Pic  
  Grand Finale: Identify the Climate Graph! Point out the key features of temperature and rainfall for each graph.  
  Suggest a location city for each graph.  
















  Match each Climatic Region with a graph.  
Equatorial    = Warm Temperate - Mediterranean  =
Monsoon      = Cool West Margin                              =
Savanna       = Continental Interior                           =
Hot Desert   = Temperate East Margin                    =
  Worksheet A4 copy for students  
  Cities: Manaus; Mumbai; Kayes; Baghdad; Rennes, Palermo; Winnipeg; Charleston.