▁will ▁experience ▁additional ▁changes ▁due ▁both ▁to ▁' natural ' ▁climate ▁vari ability ▁and ▁due ▁to ▁feedback s ▁related ▁to ▁the ▁interaction ▁between ▁climate ▁vari ability ▁and ▁increasing ▁green house ▁g ases . ▁For ▁example , ▁based ▁on ▁pro jections ▁made ▁by ▁the ▁Inter g overn ment al ▁P anel ▁on ▁Cl imate ▁Change ▁and ▁results ▁from ▁the ▁United ▁Kingdom ▁Had ley ▁Centre ’ s ▁climate ▁model ▁( H ad CM 2 ), ▁a ▁model ▁that ▁accounts ▁for ▁both ▁green house ▁g ases ▁and ▁a eros ols , ▁by ▁ 2 1 0 0 ▁temper atures ▁in ▁Id aho ▁could ▁increase ▁by ▁ ▁( with ▁a ▁range ▁of ▁ ▁to ▁) ▁in ▁winter ▁and ▁summer ▁and ▁ ▁( with ▁a ▁range ▁of ▁ ▁to ▁) ▁in ▁spring ▁and ▁fall . ▁P reci p itation ▁is ▁estimated ▁to ▁change ▁little ▁in ▁summer , ▁to ▁increase ▁by ▁ 1 0 % ▁in ▁spring ▁and ▁fall ▁( with ▁a ▁range ▁of ▁ 5 - 2 0 % ), ▁and ▁to ▁increase ▁by ▁ 2 0 % ▁in ▁winter ▁( with ▁a ▁range ▁of ▁ 1 0 - 4 0 %). ▁Other ▁climate ▁models ▁may ▁show ▁different ▁results , ▁especially ▁regarding ▁estimated ▁changes ▁in ▁precip itation . ▁The ▁impact s ▁described ▁in ▁the ▁sections ▁that ▁follow ▁take ▁into ▁account ▁estimates ▁from ▁different ▁models . ▁The ▁amount ▁of ▁precip itation ▁on ▁extreme ▁wet ▁or ▁snow y ▁days ▁in ▁winter ▁is ▁likely ▁to ▁increase . ▁The ▁frequency ▁of ▁extreme ▁hot ▁days ▁in ▁summer ▁would ▁increase ▁because ▁of ▁the ▁general