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
73.4
69
64
83
69
74
February
85.3
78
81
86
83
90
March
86.7
79
90
86
87
90
April
89.2
94
78
86
91
May
90.1
93
85
89
94
June
88.9
92
89
87
77
July
91.2
90
92
86
94
August
90.2
93
93
77
89
September
89.1
91
92
93
91
October
80.6
73
89
69
87
November
77.2
79
69
79
74
December
70.1
71
58
82
71
Average
84.5
75.4
85.8
85.4
82.8
86.1
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
-14.1
-12
-12
-20
-9
-12
February
-13.6
-8
-12
-16
-13
-10
March
-4.5
-5
-6
-4
-1
-3
April
4.3
4
4
6
3
May
14.0
19
13
13
13
June
20.4
24
20
21
18
July
23.9
21
23
25
25
August
21.6
22
22
21
22
September
15.8
20
17
17
14
October
6.1
7
8
11
2
November
-6.6
-4
-4
-2
-5
December
-12.3
-4
-13
-14
-11
Average
2.8
-9.3
6.6
5.1
6.5
3.9
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
-23.3
-21
-19
-31
-17
-22
February
-26.6
-19
-27
-31
-27
-23
March
-18.9
-18
-20
-17
-14
-18
April
-9.6
-8
-7
-6
-9
May
1.6
5
3
1
0
June
9.2
12
8
10
8
July
12.1
11
12
12
14
August
11.0
11
12
11
12
September
6.4
9
6
9
5
October
-1.4
0
0
4
-4
November
-13.8
-11
-10
-9
-12
December
-21.7
-12
-20
-24
-20
Average
-8.2
-20.4
-4.1
-6.5
-4.0
-7.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
38.1
37
43
30
38
48
February
26.6
43
25
18
24
28
March
23.5
35
23
20
22
30
April
16.8
18
22
19
19
May
13.0
8
16
15
17
June
13.2
6
16
12
21
July
6.9
10
7
4
10
August
9.6
7
7
16
11
September
9.9
4
7
7
17
October
22.8
14
17
16
41
November
46.6
43
38
36
44
December
36.8
36
42
39
39
Average
22.2
38.2
17.3
17.4
18.6
25.3
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
6.7
7
6
8
6
7
February
7.4
7
8
8
7
7
March
7.8
8
7
7
9
8
April
8.1
8
9
8
8
May
7.2
8
8
8
8
June
6.5
6
8
8
7
July
6.9
8
7
7
4
August
6.1
6
7
7
0
September
6.1
7
9
7
0
October
7.4
6
9
6
8
November
7.2
8
7
8
7
December
6.8
8
7
7
6
Average
7.0
7.2
7.1
7.7
7.4
5.7
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
256°
240°
254°
234°
241°
February
294°
251°
258°
231°
258°
March
317°
290°
272°
254°
269°
April
036°
033°
314°
311°
May
051°
106°
287°
334°
June
122°
317°
275°
057°
July
265°
284°
260°
225°
August
265°
255°
250°
252°
September
213°
240°
253°
012°
October
313°
247°
289°
245°
November
257°
275°
265°
262°
December
231°
325°
243°
248°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.