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Rough draft of a possible improved climate classification system...partially adapted from M. Fantamon. All temperatures reflect the mean (average of diurnal high and low). When considering a climate classification, choose the best fit if multiple classifications exist. Temperature conditional, precipitation conditional If bold the condition applies to the entire climate group (ie tropical climates). Equatorial (A) coldest month > 22cannual amplitude <= 5cannual precip >= 2000 mm, wettest month less than 2x wetter than driest month equatorial rainforest (Ar)annual precip >= 1000 mm, wettest month greater than 2x wetter than driest month equatorial gradient (Ag)annual temp >= 25c hot (a) < 25c warm (b*)Tropical (B*) coldest month > 18cannual amplitude <= 12cannual precip < 800 mm & no month > 80 mm tropical semi-arid (Bq)annual precip < 1250 mm tropical dry (Bd)annual precip < 1500 mm & dry winter/summer, wettest month at least 3x wetter than driest month tropical savanna - dry winter (Bw), dry summer (Bs)annual precip >= 1250 mm, wettest month less than 2x wetter than driest month tropical humid/maritime (Bm)annual precip >= 1500 mm, wettest month >= 400 mm, wettest month at least 4x wetter than driest month tropical monsoon (Bn)warmest month >= 30c desert (a) >= 25c warm (b*)Subtropical (C*) coldest month between 5c and 18cat least eight (8) months >= 10cwarmest month >= 22cannual precip <= 150 mm, no month > 20 mm subtropical arid/desert (Co)annual precip 150-400 mm, no month > 50 mm subtropical semi-arid (Cq)annual precip > 150 mm, total precip < 100 mm over at least three (3) month period, driest month <= 30 mm, wettest month at least 2x wetter than driest month Mediterranean (dry summer) (Cs), subtropical dry winter (Cw)annual precip >= 800 mm, no month < 30 mm, at least one (1) month >= 100 mm subtropical humid (Cr)annual precip >= 1000 mm, wettest month less than 2x wetter than driest month subtropical maritime (Cm)annual temp >= 20c tropical limit / hot desert (a) 15-20c very warm (b*) < 15c warm temperate (c*)Temperate (D) at least four (4) months >= 10cannual temp >= 3ccoldest month <= 0c, annual precip <= 125 mm, no month > 20 mm temperate cold desert (Do)coldest month <= 0c, annual precip 125-400 mm, no month > 50 mm temperate cold semi-arid (Dn)coldest month > 0c, annual precip 125-400 mm, no month > 50 mm temperate semi-arid (Dq)coldest month <= 0c, annual amplitude >= 20c temperate continental (Dc)coldest month <= 5c, annual amplitude >= 15c temperate semi-continental (Dt)annual amplitude 10-15c temperate maritime (Dm)annual amplitude < 10c temperate oceanic (Dr)annual temp >= 10c warm (a), 5-10c mild (b*), < 5c cold (c*)annual precip < 800 mm dry (d), > 800 mm humid (h)wettest month at least 3x wetter than driest month - dry summer (s), dry winter (w)Subpolar (E) at least one month >= 10ccoldest month <= 0c, warmest month < 12c subpolar oceanic (Er)coldest month <= -7c, annual amplitude < 20c subpolar maritime (Em)coldest month <= -30c subpolar cold winter (Eq)annual amplitude >= 20c subpolar continental (Ec)annual temp >= 3c temperate (a), >= -7c cold (b*), < -7c frigid (c*)annual precip < 400 mm dry (d), >= 400 mm humid (h)Polar (F) no month >= 10cat least three (3) months <= 0cannual temp <= 0c polar ice sheet (Fo)annual amplitude < 20c polar oceanic (Fr)annual amplitude >= 20c polar continental (Fc) Comments and feedback welcome.