National Weather Service United States Department of Commerce
...A cold start to April...

April started on a very cold note this year. Through the first 9
days of the month, the average temperature at Caribou of 27.3
degrees was 6 degrees below average.  It tied with 1947 and 1957 
as the 10th coldest start to the month of April.  Only the first 
day of the month featured an average temperature that was above 
the 30-year average. The 5th and 9th were quite cold with a high 
of only 29 degrees both days. On average, Caribou can expect to 
have a high temperature below 30 degrees during the month of April
about once every 3 years. 2003 takes top honors with 6 days where
the high failed to reach 30F. 

At Bangor, the average temperature from April 1-9 was 33.6
degrees, which was 4.6 degrees below average. It tied with 1975
for the 12th coldest start to the month. The 1st was the only day
to have an average daily temperature that was above the 30-year
average.