1887 through 2007 (121 Growing seasons)
Growing
season is defined as continuous temperatures > 32F,
following
the last freeze in Spring and prior to the first freeze in the Autumn.
Year 2007:
Last temperature
< 32 F was April 15 and
Year 2007:
First temperature
<32 F was October 23,
for a growing
season of 190 days (18th longest growing season since 1887).
LINK: Lincoln's First Freeze Climatology, 1887-2007
121-year,
1887-2007 average growing season length: 172 days.
Standard
30-year, 1971-2000, average growing season length: 162 days.
The last
30 years, 1978-2007, average growing season length: 161 days.