Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
84.3
87
65
92
82
90
February
75.9
75
68
84
96
82
March
70.8
73
61
92
76
71
April
84.9
90
87
86
63
May
88.3
89
90
91
99
June
90.5
85
94
87
94
July
85.9
73
91
78
87
August
85.3
75
81
100
96
September
90.2
89
87
0
94
October
84.1
75
85
0
84
November
73.8
77
60
67
December
78.6
76
57
88
84
Average
83.6
76.8
78.0
85.0
85.8
85.6
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-11.4
-8
-10
-12
-9
-15
February
-9.6
-4
-11
-11
-13
-14
March
-5.2
-6
-5
-4
-8
-6
April
-1.8
-5
1
0
0
May
10.0
8
4
12
14
June
15.8
14
16
14
16
July
16.6
16
16
16
15
August
14.4
15
13
10
16
September
10.1
9
10
3
10
October
3.4
2
2
0
4
November
-4.9
-3
-4
-3
December
-9.2
-12
-5
-14
-9
Average
1.8
-7.8
1.6
2.4
-2.9
2.3
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-16.7
-14
-14
-17
-14
-19
February
-14.3
-8
-17
-16
-20
-22
March
-12.5
-13
-13
-11
-16
-12
April
-7.3
-14
-5
-7
-6
May
3.3
2
-2
4
6
June
9.3
8
9
8
9
July
11.6
12
10
10
10
August
9.5
11
8
8
10
September
5.6
4
7
3
5
October
-1.4
-2
-2
0
0
November
-7.1
-6
-8
-7
December
-13.4
-15
-9
-15
-13
Average
-4.5
-13.9
-4.4
-3.2
-8.8
-4.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
26.3
22
47
26
31
19
February
32.6
41
44
20
15
32
March
37.1
42
53
17
41
26
April
17.1
17
14
17
27
May
14.1
21
20
7
8
June
7.9
12
5
13
11
July
16.1
29
24
18
8
August
19.3
22
28
13
8
September
21.1
17
36
0
18
October
22.2
29
15
0
18
November
27.5
21
43
30
December
35.2
48
45
25
21
Average
22.0
37.1
27.4
22.6
18.4
16.6
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
8.1
8
8
11
8
6
February
8.9
8
7
12
10
7
March
7.8
8
7
11
7
7
April
8.2
7
8
7
7
May
7.3
7
8
8
7
June
7.0
7
8
7
7
July
6.8
6
7
6
6
August
7.1
7
8
5
6
September
7.7
6
9
0
8
October
7.5
7
7
0
8
November
8.3
9
7
7
December
7.7
7
6
7
11
Average
7.6
8.0
6.7
8.4
7.5
7.0
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
013°
010°
010°
005°
009°
February
022°
019°
022°
016°
018°
March
032°
175°
024°
047°
189°
April
039°
039°
031°
053°
May
053°
047°
031°
032°
June
182°
089°
182°
189°
July
195°
171°
215°
205°
August
185°
179°
356°
054°
September
172°
130°
360°
024°
October
011°
003°
360°
036°
November
011°
015°
039°
December
352°
118°
334°
010°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.