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
76.8
72
83
75
85
76
February
74.6
87
60
67
86
90
March
90.6
96
95
88
80
85
April
93.8
81
99
98
85
May
98.5
95
100
100
99
June
95.7
92
93
100
98
July
94.4
88
96
97
96
August
93.0
91
87
94
95
September
93.2
92
95
91
96
October
90.8
81
93
92
89
November
79.8
77
90
68
78
December
77.0
54
57
74
88
Average
89.6
85.9
84.3
89.3
90.8
90.9
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
-7.7
-9
-3
-4
-3
-13
February
-4.9
-3
-3
0
-6
-3
March
0.9
2
1
3
-2
-1
April
7.6
5
8
7
7
May
14.3
13
16
14
16
June
18.4
17
22
19
18
July
20.2
19
20
19
21
August
18.5
19
17
18
20
September
13.7
12
13
12
14
October
6.6
5
6
6
6
November
-3.9
0
-2
-8
-3
December
-5.7
-6
-8
-6
-3
Average
5.9
-4.6
6.7
8.0
6.0
6.6
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
-14.7
-16
-10
-12
-9
-21
February
-12.6
-11
-11
-6
-14
-12
March
-9.1
-6
-9
-6
-14
-11
April
-2.0
-4
-2
-4
-2
May
5.1
5
5
5
6
June
9.8
10
11
10
10
July
12.1
12
12
12
12
August
10.5
11
10
10
11
September
6.1
5
7
4
6
October
-1.8
-2
-1
-1
-1
November
-9.4
-6
-9
-15
-10
December
-11.1
-13
-15
-14
-10
Average
-3.8
-12.6
-1.1
0.1
-3.6
-2.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
20.5
23
13
23
15
22
February
30.3
17
54
40
25
26
March
11.7
10
11
11
25
18
April
9.4
23
3
8
13
May
7.6
12
1
7
4
June
8.9
20
6
8
9
July
13.5
18
22
10
13
August
18.2
18
31
18
13
September
17.4
18
31
12
18
October
15.7
21
13
16
13
November
19.0
39
12
32
16
December
29.3
40
57
26
30
Average
15.4
16.1
22.4
18.3
15.0
14.7
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
2.8
2
2
3
3
3
February
2.6
3
2
2
3
4
March
3.3
3
4
3
3
4
April
3.2
3
3
3
4
May
3.3
3
4
3
3
June
2.7
3
3
3
3
July
2.4
2
3
2
3
August
2.6
3
2
2
3
September
2.6
3
3
3
3
October
3.0
3
3
3
3
November
3.0
4
3
2
4
December
3.2
3
3
3
4
Average
2.9
2.8
2.8
2.9
2.8
3.1
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
160°
186°
188°
118°
179°
February
054°
213°
175°
200°
196°
March
226°
119°
223°
240°
018°
April
255°
292°
258°
264°
May
269°
299°
286°
279°
June
306°
285°
268°
281°
July
276°
331°
293°
306°
August
333°
034°
301°
349°
September
242°
056°
205°
040°
October
220°
221°
109°
181°
November
189°
188°
179°
072°
December
180°
185°
171°
157°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.