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
69.9
55
68
86
67
63
February
79.8
90
88
80
85
75
March
83.8
90
83
87
89
69
April
89.9
96
96
92
84
May
91.0
97
83
92
87
June
94.3
93
98
95
99
July
94.9
94
91
87
97
August
93.8
92
90
97
97
September
92.6
93
92
94
83
October
87.0
91
90
77
89
November
88.5
94
88
97
93
December
79.2
65
71
76
91
Average
86.8
79.1
88.7
88.6
88.0
86.0
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
1.2
0
4
0
1
3
February
4.6
11
7
2
-3
3
March
10.5
15
10
11
13
11
April
16.6
20
15
17
16
May
23.3
25
24
21
20
June
28.5
28
29
29
29
July
29.0
29
29
28
30
August
27.8
28
28
29
28
September
25.8
25
25
27
24
October
17.9
18
18
19
17
November
9.5
11
11
9
14
December
5.7
7
5
9
5
Average
15.7
8.3
17.7
16.7
16.6
16.6
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
-7.6
-6
-2
-11
-5
-4
February
-6.7
-3
-3
-8
-10
-6
March
0.3
2
0
0
2
1
April
4.9
5
5
6
4
May
12.1
12
14
11
11
June
17.3
15
17
19
18
July
19.1
19
19
19
20
August
17.7
18
18
19
17
September
14.7
14
14
15
13
October
7.6
8
5
11
6
November
0.0
0
1
0
3
December
-3.3
0
-2
-1
-4
Average
5.5
-3.8
7.1
6.2
7.2
6.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
18.8
20
16
10
25
16
February
16.4
4
13
23
22
28
March
13.6
9
17
16
10
20
April
10.5
8
14
10
11
May
7.2
4
10
14
8
June
3.7
4
7
5
2
July
3.6
3
6
7
3
August
3.0
6
3
2
3
September
3.5
7
4
2
3
October
10.6
10
12
15
7
November
9.7
5
17
6
8
December
11.0
17
18
8
6
Average
9.1
10.4
8.6
10.7
9.9
8.9
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
11.7
10
11
13
10
11
February
12.0
11
13
13
12
11
March
12.9
14
14
13
13
12
April
12.5
12
14
12
12
May
10.9
10
12
11
11
June
9.7
10
9
9
10
July
8.0
7
8
8
8
August
8.0
8
8
7
7
September
8.4
7
9
9
9
October
10.8
11
11
10
11
November
11.6
10
13
11
13
December
11.3
11
11
12
11
Average
10.7
11.8
10.2
10.8
10.2
10.3
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
257°
259°
286°
259°
241°
February
234°
242°
238°
315°
287°
March
233°
242°
246°
163°
231°
April
225°
221°
249°
277°
May
090°
180°
175°
211°
June
022°
255°
218°
202°
July
245°
260°
316°
189°
August
299°
236°
199°
208°
September
159°
270°
243°
200°
October
260°
241°
273°
259°
November
244°
225°
238°
219°
December
227°
191°
219°
246°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.