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
59
92
71
68
February
81.5
92
86
84
88
71
March
78.9
33
83
92
91
75
April
92.4
97
93
93
91
May
91.7
98
89
92
94
June
90.6
86
97
95
97
July
91.6
86
93
88
94
August
92.4
89
91
94
93
September
92.0
92
94
95
86
October
87.1
91
97
75
88
November
86.9
89
87
90
92
December
82.2
77
74
80
82
Average
84.6
59.7
89.0
91.1
88.3
87.1
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
2.2
1
0
2
6
February
5.9
10
10
3
-2
5
March
10.3
7
10
12
14
12
April
17.1
18
15
17
17
May
23.5
24
24
21
22
June
28.3
27
28
28
30
July
28.9
28
29
27
30
August
24.6
27
27
29
5
September
23.6
25
24
26
7
October
19.1
19
19
20
19
November
10.4
12
11
9
15
December
6.5
8
6
9
4
Average
15.7
5.7
19.2
17.0
16.7
14.6
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
-6.7
-6
-10
-4
-1
February
-4.8
-2
1
-7
-10
-2
March
0.9
2
0
1
2
3
April
5.7
5
5
5
5
May
11.0
11
13
10
11
June
13.9
15
13
17
17
July
17.0
17
16
17
18
August
13.9
16
14
18
3
September
12.5
12
13
14
3
October
7.6
8
5
11
7
November
0.7
0
1
-1
4
December
-2.3
1
-1
0
-3
Average
5.4
-2.1
8.1
5.5
6.6
5.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
13.5
26
7
8
12
February
11.8
4
11
19
14
25
March
9.1
4
13
8
5
14
April
8.0
8
9
8
8
May
7.1
6
10
8
6
June
3.5
3
2
5
3
July
3.6
2
5
4
4
August
2.5
5
1
2
3
September
3.9
3
2
6
4
October
7.9
10
4
12
4
November
8.0
7
14
7
5
December
8.2
13
7
7
4
Average
7.3
10.3
6.6
6.8
6.7
6.9
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
9.8
11
11
10
8
February
10.2
10
13
11
10
10
March
10.2
5
13
12
11
10
April
10.7
11
13
11
10
May
8.5
9
11
9
9
June
7.4
8
8
8
8
July
5.2
5
7
6
5
August
4.8
6
6
5
4
September
5.7
5
7
7
6
October
7.9
8
10
8
8
November
9.2
9
11
10
11
December
9.3
9
10
11
9
Average
8.1
8.2
8.3
9.4
8.6
8.0
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
245°
271°
241°
253°
February
242°
241°
244°
297°
295°
March
206°
253°
240°
195°
271°
April
234°
219°
254°
280°
May
088°
172°
214°
246°
June
035°
252°
231°
228°
July
250°
252°
264°
262°
August
258°
255°
209°
293°
September
139°
280°
242°
240°
October
254°
223°
230°
248°
November
241°
222°
237°
245°
December
231°
156°
221°
242°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.