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
75.1
74
59
69
80
71
February
88.2
89
82
89
79
89
March
88.3
80
84
79
94
88
April
93.0
97
84
97
92
May
89.9
72
86
97
88
June
92.6
73
97
98
98
July
95.0
90
98
91
93
August
92.8
82
93
97
95
September
93.1
79
97
98
96
October
91.2
89
93
96
88
November
78.7
64
75
86
87
December
82.3
99
67
75
80
Average
88.6
80.7
80.4
86.5
91.9
89.7
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
-11.3
-13
-8
-13
-7
-12
February
-10.1
-4
-8
-12
-14
-6
March
-2.4
-3
-4
-2
4
-5
April
6.6
8
5
8
4
May
16.6
21
13
15
16
June
21.4
24
20
24
20
July
23.9
24
24
25
23
August
22.5
23
25
22
22
September
16.3
20
20
17
15
October
7.3
9
12
9
3
November
-4.2
-1
-4
-1
-4
December
-10.8
-2
-16
-16
-6
Average
5.1
-7.1
9.0
6.9
7.2
5.8
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
-19.4
-21
-14
-23
-15
-18
February
-21.5
-14
-21
-24
-24
-17
March
-14.3
-15
-18
-13
-10
-16
April
-5.5
-3
-5
-4
-8
May
4.7
9
3
2
3
June
11.9
13
11
13
11
July
14.3
14
14
15
14
August
13.1
14
15
13
13
September
7.9
10
10
9
7
October
0.2
1
3
2
-2
November
-10.3
-6
-10
-7
-11
December
-17.3
-10
-23
-24
-14
Average
-5.7
-17.3
-1.1
-3.2
-3.5
-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
32.4
35
28
41
26
22
February
27.8
23
30
33
27
15
March
24.0
25
35
32
12
25
April
12.3
7
24
8
15
May
9.9
2
15
9
10
June
12.3
11
13
9
8
July
9.0
11
9
3
11
August
8.5
11
7
3
11
September
9.8
4
6
11
10
October
15.5
26
0
6
29
November
39.1
29
47
21
37
December
28.9
7
50
46
26
Average
18.8
27.9
16.3
21.6
13.0
16.8
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
7.3
7
7
9
7
7
February
7.4
7
7
8
8
8
March
7.9
8
7
8
8
8
April
8.5
8
10
8
9
May
7.6
7
8
8
8
June
7.8
8
8
7
8
July
7.3
8
7
7
8
August
7.8
7
8
8
9
September
8.3
7
9
9
9
October
9.1
9
8
8
10
November
8.4
9
9
8
8
December
6.7
7
8
7
6
Average
7.8
7.5
7.5
8.1
7.8
8.1
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
308°
280°
321°
214°
271°
February
333°
303°
317°
319°
280°
March
034°
140°
327°
255°
333°
April
135°
357°
336°
322°
May
162°
058°
066°
062°
June
329°
029°
293°
071°
July
346°
302°
281°
298°
August
307°
312°
292°
267°
September
248°
271°
285°
302°
October
288°
269°
198°
312°
November
301°
346°
186°
273°
December
216°
330°
310°
265°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.