Does warm weather now mean a hot summer?

From the Chicago Office of the National Weather Service:

Northern Illinois and northwest Indiana are in the midst of a rare March warm spell. For the first half of the month of March, Chicago was 11.9 degrees above normal and Rockford was running 10.6 degrees above normal. What does that mean for the rest of this spring and summer? Here is a look back at other warm Marches and how the following springs and summers turned out.

Chicago

March rank	Year	Avg Temp	Departure from Normal (37.9)	Spring Avg	Departure from normal (47.7)	Summer Avg	Departure from normal (71.8)	No. of 90 degree days
1	1945	48.6	+10.7	50.8	+3.1	69.8	-2.0	16
1	1910	48.6	+10.7	51.1	+3.4	72.5	+0.7	9
3	1946	47.2	+9.3	51.7	+4.0	71.0	-0.8	21
4	1921	45.8	+7.9	53.9	+6.2	75.9	+4.1	23
5	1878	45.3	+7.4	51.0	+3.3	71.6	-0.2	4
6	1973	45.1	+7.2	49.8	+2.1	75.3	+3.5	29
6	1938	45.1	+7.2	51.2	+3.5	72.1	+0.3	9

From this table we can see that years with very warm Marches ended up having very warm springs. The spring of 1921 was the second warmest on record. In fact all but 1973 ranked in the top 20 all time. But a similar correlation with warm summers does not exist. Three of the summers following a warm March were above normal and only 2 were much above normal. Summer of 1921 was the 3^rd warmest on record. But 2 of the summers were near normal and 2 were below normal. We can also look at the number of days of 90 degree weather. Three of the years had an excessive number of 90 degree days, 3 had less than the normal number of 90 degree days, and one was close to normal.

Climate the culprit?