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
82.8
86
77
72
85
88
February
77.7
76
68
48
90
75
March
87.6
82
96
79
84
90
April
93.9
91
95
88
97
May
92.4
83
93
98
98
June
88.0
72
82
85
99
July
82.1
71
68
91
88
August
81.5
66
72
86
95
September
93.6
91
91
96
95
October
94.8
98
93
96
96
November
85.8
76
82
92
82
December
78.9
72
75
91
81
Average
86.6
81.2
79.5
80.0
90.1
91.4
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
-3.6
-3
0
-3
0
-7
February
-1.7
-1
0
1
-1
-1
March
2.3
2
3
3
1
3
April
6.9
6
6
7
6
May
11.6
10
13
11
14
June
15.8
14
19
16
15
July
17.4
17
17
16
18
August
16.4
16
15
16
17
September
12.7
12
11
12
13
October
7.1
8
6
7
6
November
1.0
2
1
-4
1
December
-2.5
-2
0
-4
-2
Average
6.3
-1.6
7.1
7.6
6.4
7.0
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
-8.3
-9
-3
-9
-6
-13
February
-8.5
-8
-7
-4
-11
-7
March
-5.4
-4
-5
-3
-7
-5
April
-1.4
-1
-1
-2
-1
May
4.2
4
3
4
5
June
7.6
7
8
8
7
July
9.2
9
10
9
9
August
8.5
9
9
8
9
September
5.7
5
6
5
5
October
1.9
1
3
1
2
November
-4.6
-2
-1
-9
-5
December
-7.9
-8
0
-10
-6
Average
-1.6
-7.0
1.0
1.6
-1.2
0.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
26.6
33
37
39
32
30
February
27.2
33
48
61
19
37
March
19.2
29
8
36
26
20
April
17.9
22
14
20
22
May
22.6
33
10
26
23
June
20.1
44
8
26
20
July
17.2
26
23
28
16
August
29.1
39
54
29
22
September
35.9
46
58
24
39
October
28.2
33
35
28
28
November
29.5
53
39
26
24
December
32.5
42
25
23
47
Average
25.0
31.5
34.9
31.2
25.4
25.8
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
3.2
4
1
4
2
5
February
3.0
3
3
1
3
3
March
4.5
2
6
2
5
6
April
3.3
3
3
4
3
May
3.6
3
4
4
4
June
3.2
3
4
3
4
July
2.8
3
3
3
3
August
2.5
2
2
3
3
September
2.4
2
2
4
2
October
3.1
3
4
2
3
November
3.8
2
5
3
5
December
2.4
3
4
3
2
Average
3.2
3.1
2.9
2.9
3.4
3.5
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
080°
099°
048°
089°
065°
February
064°
071°
088°
074°
085°
March
062°
065°
116°
079°
067°
April
128°
320°
061°
088°
May
246°
235°
245°
233°
June
245°
235°
239°
242°
July
235°
234°
236°
199°
August
225°
209°
198°
193°
September
219°
224°
084°
162°
October
093°
083°
092°
081°
November
085°
060°
085°
074°
December
056°
062°
069°
073°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.