The table shows, for each of 10 Irish weather stations and each of 8 c

1. The station with the greatest average number of days of recorded snowfall during January of years 1961 through 2000 had the greatest total number of days with recorded snowfall during those years.
Sort the table by Jan month. Claremorris has the greatest average number of days, which is 6.5
However, when you compare the averages every month of Claremorris with Clones, you can easily make it the averages are more for clones. We do not require to multiply number of days with the averages to get to the answer. The gap in the avergaes between the two stations cannot be covered by minor variations in days in months of a year.
Hence, 'Might not be true' is the answer.

2. Cork had at least 2 days with recorded snowfall during February in each of the years from 1961 through 2000.
The average over a month cannot tell us about the rains on the individual days.
Clearly, need not be true.

3. In at least one year from 1961 through 2000, the station at Valentia recorded 2 or more days of snowfall in a single calendar month.
Valentia had average rainfall of 1.3 and 1.4 in Jan and Feb. If rainfall was recorded on only one day each Feb every year, then the average would be 1 or less.
But 1.3 means, there were some years when the rains were there on at least 2 days.
Must be true