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
77.9
68
59
96
68
80
February
89.5
97
96
94
93
93
March
90.8
93
88
89
93
86
April
89.8
90
92
91
89
May
93.9
96
95
90
97
June
96.2
95
98
99
97
July
95.2
97
98
94
95
August
92.9
94
98
91
96
September
91.4
90
96
96
90
October
90.1
87
98
88
92
November
90.1
95
85
99
92
December
78.0
72
80
76
87
Average
89.9
86.5
88.8
93.9
90.3
91.5
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
-5.9
-3
-3
-6
-4
0
February
-2.0
5
-3
-4
-8
1
March
4.2
7
1
4
9
5
April
11.0
11
10
13
12
May
20.4
23
22
20
18
June
22.6
28
2
28
26
July
25.7
27
18
28
27
August
25.1
27
26
26
25
September
21.9
24
22
23
20
October
12.8
14
15
17
9
November
4.2
6
5
7
7
December
-1.1
4
-2
1
-1
Average
10.6
2.9
13.1
9.6
13.3
12.4
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
-12.1
-9
-10
-18
-10
-7
February
-13.0
-6
-12
-16
-18
-11
March
-6.5
-4
-7
-5
-3
-3
April
0.2
1
1
1
-1
May
8.3
9
10
7
8
June
12.1
14
0
16
14
July
14.2
13
9
15
16
August
14.1
14
15
15
15
September
10.7
13
11
10
8
October
3.7
6
3
7
0
November
-4.3
-3
-3
-2
-2
December
-9.3
-3
-10
-9
-9
Average
0.7
-7.6
2.9
0.2
2.5
2.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.9
8
22
7
8
17
February
10.0
3
5
12
9
8
March
9.2
10
16
12
8
13
April
13.5
15
18
17
10
May
7.2
2
9
9
5
June
4.4
2
5
4
5
July
3.2
1
4
3
4
August
4.8
2
5
6
4
September
5.3
6
3
2
4
October
9.4
11
4
5
10
November
9.0
4
21
5
5
December
15.0
5
19
18
10
Average
8.1
7.0
7.1
8.9
7.5
7.6
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
5.4
6
5
6
5
6
February
6.3
7
6
7
6
6
March
6.8
7
7
7
8
7
April
7.7
8
10
7
8
May
6.9
7
8
7
7
June
6.6
6
7
6
7
July
5.0
5
6
5
5
August
5.4
6
6
5
6
September
6.2
7
6
6
6
October
7.0
7
7
6
7
November
6.9
7
7
8
7
December
5.6
6
6
7
6
Average
6.4
6.7
6.3
6.9
6.2
6.4
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°
309°
218°
151°
228°
February
235°
245°
264°
249°
259°
March
300°
351°
308°
182°
229°
April
272°
172°
294°
300°
May
120°
155°
178°
025°
June
072°
219°
220°
152°
July
264°
235°
149°
195°
August
122°
159°
187°
189°
September
123°
184°
192°
220°
October
293°
210°
105°
246°
November
225°
225°
241°
215°
December
173°
130°
192°
235°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.