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
56.2
47
52
54
76
20
February
71.8
67
64
66
73
64
March
95.7
94
96
96
96
95
April
99.5
100
99
99
100
100
May
99.8
100
100
100
100
100
June
99.8
100
100
100
100
100
July
97.8
97
99
100
99
100
August
96.0
96
100
100
81
98
September
97.5
96
99
99
93
October
95.5
98
98
98
99
November
90.5
93
97
88
96
December
64.7
65
84
69
74
Average
90.9
90.1
90.6
93.0
91.3
89.1
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
-18.4
-17
-19
-15
-16
-19
February
-13.9
-15
-10
-12
-12
-11
March
1.2
2
2
-1
1
1
April
10.9
11
7
11
9
15
May
17.7
20
16
20
13
18
June
24.8
24
25
25
23
24
July
26.6
29
27
26
25
27
August
23.4
25
24
22
23
22
September
16.7
18
18
15
16
October
7.7
11
6
8
6
November
-5.1
-6
-4
-3
-2
December
-15.9
-17
-11
-12
-14
Average
7.0
10.1
6.5
7.6
6.2
6.8
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
-30.8
-30
-30
-28
-27
-30
February
-27.0
-29
-26
-27
-26
-27
March
-14.7
-14
-13
-16
-13
-11
April
-4.9
-2
-6
-3
-3
-2
May
3.7
5
2
4
3
5
June
11.2
11
10
12
10
10
July
14.5
16
15
13
14
15
August
11.4
13
12
8
11
13
September
3.9
5
4
3
4
October
-6.1
-4
-7
-7
-6
November
-17.6
-16
-16
-15
-13
December
-25.3
-27
-20
-24
-26
Average
-6.0
-4.3
-7.5
-6.1
-6.0
-6.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.3
3
16
16
24
5
February
7.4
6
8
6
8
6
March
4.3
1
5
6
3
8
April
2.5
3
3
3
4
1
May
3.1
3
3
4
5
5
June
5.1
9
5
5
9
4
July
5.7
6
5
4
11
7
August
5.9
5
12
3
5
10
September
5.6
6
6
5
6
October
4.3
1
4
1
5
November
9.7
11
9
11
13
December
20.1
12
26
10
11
Average
6.3
4.5
6.7
6.3
7.4
6.4
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
3.1
2
4
3
5
1
February
3.4
3
3
4
4
2
March
5.9
5
7
6
6
8
April
8.6
9
10
9
9
8
May
9.4
8
9
9
10
10
June
7.9
7
8
7
8
8
July
7.1
7
7
8
6
7
August
6.5
6
7
7
6
7
September
6.7
5
7
7
6
October
5.4
5
6
5
6
November
4.7
6
5
4
4
December
4.3
3
8
3
4
Average
6.4
6.0
6.4
6.7
6.4
6.3
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
298°
320°
281°
313°
298°
February
300°
289°
287°
320°
284°
March
309°
305°
311°
322°
307°
April
328°
319°
323°
344°
003°
May
339°
326°
332°
332°
341°
June
345°
349°
013°
353°
358°
July
005°
360°
339°
018°
358°
August
004°
026°
322°
358°
031°
September
003°
331°
340°
341°
October
302°
313°
323°
305°
November
314°
316°
282°
292°
December
297°
287°
292°
282°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.