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
94.9
95
96
96
93
95
February
97.6
98
99
98
96
97
March
93.7
99
94
99
88
90
April
90.8
79
93
89
92
96
May
91.6
93
96
97
88
92
June
97.8
100
93
99
100
100
July
85.7
88
97
79
73
87
August
82.1
97
95
69
73
88
September
84.3
87
86
88
78
October
75.6
72
86
79
80
November
89.0
88
91
95
95
December
94.5
99
84
99
91
Average
88.6
93.2
92.1
87.9
85.7
89.5
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
-29.8
-27
-35
-24
-34
-21
February
-23.1
-24
-22
-19
-31
-17
March
-14.3
-14
-13
-13
-17
-14
April
-4.4
-4
-5
-3
-6
1
May
6.1
6
5
7
7
8
June
19.1
18
16
19
19
21
July
19.6
19
21
19
21
18
August
16.5
15
20
11
16
19
September
6.6
6
2
9
10
October
-5.5
-4
-3
-2
-7
November
-18.0
-16
-21
-19
-13
December
-27.2
-27
-24
-28
-27
Average
-3.3
-3.5
-5.5
-4.6
-6.7
-2.1
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
-35.9
-33
-42
-30
-39
-27
February
-30.6
-30
-29
-27
-37
-24
March
-23.8
-21
-22
-21
-26
-23
April
-12.2
-12
-13
-11
-15
-7
May
-2.8
-1
-3
-1
1
0
June
9.9
10
7
9
10
12
July
10.9
11
11
12
12
10
August
8.1
8
9
5
8
9
September
-1.8
-1
-3
1
3
October
-10.5
-9
-7
-9
-12
November
-24.2
-22
-27
-25
-18
December
-33.3
-31
-31
-35
-32
Average
-10.0
-10.5
-12.0
-11.6
-13.3
-10.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
19.7
25
23
14
17
21
February
19.1
15
23
18
14
25
March
31.9
27
38
18
43
36
April
25.3
40
27
30
27
14
May
16.7
15
10
12
23
19
June
7.3
13
15
7
2
1
July
9.6
4
9
18
9
12
August
12.0
7
6
37
7
3
September
18.1
23
32
10
9
October
40.3
43
32
35
40
November
35.9
39
37
27
42
December
32.7
28
43
28
47
Average
20.7
18.9
21.6
24.2
20.3
19.8
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
4.1
4
3
4
4
5
February
4.0
4
4
4
4
4
March
5.6
5
7
4
5
6
April
6.9
8
8
6
7
8
May
6.5
7
7
6
6
7
June
5.9
7
7
6
6
5
July
5.6
6
6
5
6
6
August
5.3
5
6
7
5
4
September
5.7
7
6
5
5
October
5.6
6
6
6
5
November
4.5
5
4
5
4
December
4.5
5
6
4
5
Average
5.7
5.8
6.2
5.5
5.3
5.6
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
255°
254°
239°
284°
194°
February
260°
250°
262°
324°
228°
March
223°
220°
220°
244°
222°
April
240°
153°
265°
274°
250°
May
209°
296°
324°
345°
323°
June
127°
246°
145°
253°
105°
July
052°
256°
031°
241°
115°
August
117°
021°
022°
324°
003°
September
273°
273°
237°
192°
October
211°
256°
254°
221°
November
258°
254°
211°
234°
December
274°
269°
267°
270°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.