-8 - 
A MAP INSERTED AT THE END OF TH IS REP)RT SHOWS BY CONTOUR 
LINES THE AVEPAGE ANNUAL SNOWFALL IN INCHES. THESE CONTOUR LINES 
WERE DfAWN FROM THE WEATHER BUREAU RECORDS. EAST OF THE ROCKY 
VhOUNTAINS THE LINES ARE PLOTTED IT I-INCH, S-INCH AND 10-INCH 
DEPTH -OR THE SOUTH REGION WITH LIGHT SNOWFALL; AT 10-INCH IN- 
TERVALS EXTENCING TO THE GREAT LAKES REGION AND AT 20-INCH INTER- 
VALS FARTHER NORTH. WEST OF THE ROCKY MO)UNTAINS SNOWFALL CONDITIONS 
.ARE TOO VARIED TO PERMIT PLOTTING OF LINES AT UNIFORM INTERVALS OF 
S"QWFALL DEPTH. THE VAST VARIANCE IN DEPTH OF SNOWFALL THAT OCCURS 
TETWEEN THE SOUTH COAST OF CALIFORNIA AND THE MOUNTA|NOU SECTION 
OF THAT STATE, AND ALSO BETWEEN THE WESTERN SLOPES OF THE CASCADES 
AND THE LEEWARD SIDE OF THAT RANE HAVE BEEN QUOTED, AND IN VIEW 
OF THESE FACTS NO ATTEMPT HAS BEEN MADE TO DRAW LINES ZF UNIFORM 
SNOWFALL DEPTH FOR THE WESTERN STATES. FOR THESE REGIONS, THE 
LINES HAVE SEEN GENERALIZED AND AVERAGE ANNUAL SNOWFALL DEPTH SHOWN 
NUMERICALLY WHERE PRACTICABLE. A MAP OF THE UNITED STATES REPRO- 
DUCEC TICOUGH THE COURTESY OF THE WEATHER BUREAU, WHICH SHOWS THE 
AVEVAGE ANNUAL NUMBER OF DAYS WITH THE GROUND COVERED WITH SNOW, 
FOLLOWS THI S PAGE.