January 28, 1994 perhaps. Burlington went from -28 on the 27th to 47 on the 28 and back to a high of 9 on the 30th.
https://w2.weather.gov/climate/xmacis.php?wfo=btv
1994-01-15
7
-14
-3.5
-21.8
68
0
T
T
15
1994-01-16
-5
-18
-11.5
-29.7
76
0
T
T
14
1994-01-17
28
-5
11.5
-6.7
53
0
0.29
5.6
14
1994-01-18
24
-4
10.0
-8.2
55
0
0.05
0.6
19
1994-01-19
3
-17
-7.0
-25.2
72
0
0.00
0.0
16
1994-01-20
7
-6
0.5
-17.7
64
0
T
T
16
1994-01-21
13
-1
6.0
-12.2
59
0
T
T
15
1994-01-22
17
-2
7.5
-10.7
57
0
0.02
1.0
15
1994-01-23
20
-13
3.5
-14.7
61
0
0.10
2.5
16
1994-01-24
31
17
24.0
5.7
41
0
0.02
0.5
16
1994-01-25
17
0
8.5
-9.8
56
0
T
T
15
1994-01-26
0
-25
-12.5
-30.9
77
0
0.00
0.0
13
1994-01-27
15
-29
-7.0
-25.5
72
0
T
0.1
13
1994-01-28
47
14
30.5
12.0
34
0
0.31
0.6
14
1994-01-29
44
9
26.5
7.9
38
0
0.01
0.1
12
1994-01-30
9
-8
0.5
-18.2
64
0
T
0.1
11
1994-01-31
10
-13
-1.5
-20.3
66
0
0.00
0.0
11
I remember watching the 6 pm news with a temp of -27 at the time calling for rain the next day and thinking "well that can't be right." I was wrong.