Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km 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
75.7
82
81
81
75
65
February
74.7
70
83
71
80
77
March
87.6
82
90
89
88
90
April
90.1
85
89
90
94
92
May
93.5
99
99
96
84
94
June
0
0
0
0
0
July
95.0
94
94
97
97
91
August
90.6
89
87
87
93
95
September
83.3
88
79
93
86
October
70.5
79
74
61
55
November
66.8
63
64
68
66
December
63.5
49
64
76
43
Average
86.2
88.4
87.7
85.8
86.1
85.0
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km 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
-8.3
-11
0
-7
-11
-5
February
-7.5
-8
-3
-7
-7
-5
March
-1.0
0
-1
2
-1
0
April
4.1
1
5
4
4
3
May
10.7
15
11
11
8
9
June
17.6
19
18
18
19
21
July
19.0
20
18
18
22
17
August
16.4
18
18
18
16
17
September
11.0
13
10
10
12
October
2.0
0
5
3
0
November
-4.2
-7
-4
-5
1
December
-6.0
-10
-2
-8
-3
Average
4.9
6.8
5.2
5.8
4.2
5.4
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
-17.5
-21
-11
-16
-18
-13
February
-17.7
-16
-13
-17
-17
-16
March
-12.0
-11
-15
-9
-10
-10
April
-6.1
-9
-4
-6
-6
-6
May
0.3
3
-1
1
-1
-1
June
7.0
8
8
8
7
8
July
9.2
11
9
10
10
9
August
6.7
9
8
7
6
6
September
2.5
4
3
2
3
October
-5.4
-8
-3
-3
-4
November
-11.3
-15
-9
-13
-6
December
-14.2
-18
-14
-16
-8
Average
-5.7
-4.8
-5.3
-4.7
-5.2
-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
32.5
23
24
18
53
33
February
30.2
32
26
34
36
20
March
18.0
24
16
12
17
14
April
15.2
25
13
17
11
19
May
9.6
6
7
11
14
8
June
0
0
0
0
0
July
14.3
16
16
21
6
24
August
12.4
13
14
7
18
5
September
13.6
16
15
14
9
October
17.8
20
9
34
13
November
22.7
35
21
24
16
December
42.2
68
33
41
55
Average
16.3
17.3
16.6
15.0
18.6
14.6
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
5.3
6
5
7
5
6
February
5.6
6
7
6
6
5
March
7.7
6
7
8
9
8
April
7.4
7
7
8
9
9
May
7.6
7
9
8
7
8
June
0
0
0
0
0
July
6.1
5
6
6
8
6
August
6.4
7
5
7
6
6
September
6.6
7
6
8
7
October
5.7
6
6
7
5
November
4.9
4
5
4
7
December
4.8
4
4
5
5
Average
6.6
6.1
6.5
6.9
7.2
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
264°
261°
267°
347°
292°
February
191°
274°
306°
314°
277°
March
351°
317°
283°
269°
266°
April
013°
286°
321°
307°
322°
May
261°
262°
287°
353°
272°
June
360°
360°
360°
360°
360°
July
121°
031°
316°
269°
100°
August
151°
123°
214°
350°
273°
September
256°
035°
243°
243°
October
316°
234°
034°
045°
November
344°
268°
293°
224°
December
238°
331°
322°
151°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.