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
85.2
88
83
78
91
80
February
78.8
91
71
64
77
86
March
88.1
90
79
86
83
83
April
94.3
88
91
98
99
85
May
97.9
97
98
97
97
June
93.5
86
89
98
97
July
92.4
90
96
96
90
August
91.2
90
86
97
84
September
93.9
91
95
95
97
October
91.9
91
88
97
91
November
80.5
62
87
70
87
December
77.1
62
37
83
91
Average
90.1
88.8
84.8
87.4
92.0
90.1
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
-6.4
-7
-2
-5
-2
-13
February
-2.6
0
-1
1
-4
-2
March
1.9
3
2
5
0
-1
April
7.9
8
6
8
8
7
May
13.4
12
15
13
15
June
17.4
16
20
17
17
July
19.3
18
19
18
20
August
18.3
18
17
18
18
September
14.3
13
13
13
14
October
8.0
7
7
7
8
November
-1.4
2
-1
-6
-1
December
-4.3
-6
-8
-6
-2
Average
6.7
0.8
7.0
8.2
6.3
6.7
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
-15.9
-18
-9
-12
-10
-24
February
-12.7
-10
-11
-6
-14
-13
March
-10.1
-7
-10
-5
-15
-13
April
-3.2
-3
-5
-3
-4
-2
May
2.4
3
1
2
3
June
6.4
8
6
6
6
July
9.5
10
10
9
9
August
9.1
10
10
8
10
September
4.8
4
7
3
5
October
-1.3
-2
-2
-1
-2
November
-8.1
-4
-10
-13
-9
December
-11.7
-13
-16
-14
-8
Average
-3.1
-10.5
-2.3
-2.9
-4.5
-4.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.5
11
11
31
13
21
February
23.6
19
46
30
30
23
March
13.5
23
16
15
20
19
April
9.0
12
20
6
6
12
May
10.2
15
2
13
6
June
9.2
24
2
7
7
July
15.4
21
17
17
15
August
16.5
16
27
11
23
September
18.3
21
25
13
17
October
15.7
12
20
17
10
November
21.8
27
22
33
19
December
26.7
36
30
34
14
Average
15.1
16.4
20.9
16.7
15.9
14.4
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
3.7
3
3
4
4
3
February
3.9
5
3
5
4
4
March
4.5
5
5
5
4
3
April
4.8
5
4
5
5
4
May
5.9
6
6
5
6
June
5.0
5
5
5
6
July
4.2
4
4
4
4
August
4.5
4
4
5
4
September
4.3
5
4
4
4
October
4.1
3
4
4
4
November
3.2
1
4
3
4
December
3.8
4
3
3
4
Average
4.5
4.7
4.2
4.5
4.4
4.3
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
085°
082°
052°
061°
083°
February
081°
069°
120°
064°
097°
March
034°
059°
050°
013°
106°
April
344°
017°
029°
034°
285°
May
058°
329°
327°
009°
June
327°
271°
282°
257°
July
280°
226°
270°
277°
August
268°
161°
229°
220°
September
051°
145°
026°
049°
October
054°
060°
078°
063°
November
123°
068°
072°
058°
December
084°
067°
082°
080°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.