METEOROLOGICAL OBSERVATIONS AT WISLEY, 1916. 105 
other respects, however, its weather was typical— it was very cold, 
and there were several sharp frosts ; there was the normal amount of 
rain, and with it a good deal of snow ; there was also very little bright 
sunshine, but a good deal of dull, overcast weather, and in some 
districts much mist and fog ; some of the densest fogs were very 
JAN FEB MAR APR MAY JUN JUL AUGSEP OCTNOV DEC 
Fig. 33. — Mean Temperature of the Air; Mean Maximum and Mean 
Minimum Temperature of the Air; Mean Minimum Temperature on 
the Grass, for each Month. 
widespread and caused great interruption to traffic, and in the case of 
one, which occurred just after Christmas, there were many deplorable 
accidents in London and its suburbs. The month was in short quiet, 
fairly dry but abnormally dull, and very cold. The effect of this, 
following upon a succession of cool months, was to cause a general 
retardation of vegetation, and at Wisley many things in the Garden 
were practically a month later in development than usual — autumn- 
sown peas were nearly ajnonth later germinating than in 191 5, and 
