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
85.0
84
85
79
86
94
February
85.0
92
91
78
82
83
March
84.1
74
90
81
89
82
April
81.0
79
90
87
83
May
85.4
96
84
86
89
June
86.0
84
88
92
85
July
89.4
84
99
77
88
August
90.5
87
92
85
96
September
86.4
85
89
90
88
October
84.3
89
82
85
86
November
91.5
94
95
98
93
December
84.9
80
89
86
85
Average
85.9
83.1
87.0
87.3
86.6
87.4
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
4.6
4
6
3
4
7
February
6.6
6
7
7
5
7
March
8.5
9
8
10
11
10
April
13.3
13
14
14
11
May
19.1
20
19
20
19
June
23.8
22
23
26
25
July
27.6
28
29
25
29
August
26.9
25
28
27
28
September
22.9
23
22
23
24
October
17.9
19
17
18
18
November
11.9
11
14
11
15
December
7.1
9
8
9
8
Average
14.8
6.4
16.2
16.4
16.1
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
-4.9
-2
-1
-7
-2
-1
February
-3.9
-2
-3
-4
-2
-1
March
0.3
2
1
1
0
2
April
5.0
6
6
5
3
May
10.0
9
11
10
10
June
14.2
14
14
12
16
July
18.6
20
19
18
20
August
18.5
17
20
20
19
September
14.9
16
14
16
15
October
9.5
10
9
11
9
November
2.6
2
5
2
5
December
-1.2
1
1
0
0
Average
6.4
-1.4
8.1
7.4
7.3
8.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.5
9
10
12
8
0
February
6.7
3
4
12
11
4
March
6.3
11
7
3
7
2
April
7.0
3
3
8
11
May
2.8
1
1
4
2
June
3.5
5
4
1
2
July
2.4
2
1
6
1
August
2.1
3
2
4
2
September
3.4
7
3
5
1
October
6.0
4
8
4
9
November
5.4
4
2
2
5
December
6.5
6
11
3
8
Average
5.0
7.6
4.2
4.4
5.0
3.8
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
7.4
7
6
8
7
7
February
7.2
7
7
8
7
7
March
8.0
8
8
7
8
8
April
7.7
7
8
7
9
May
7.0
7
8
7
8
June
6.1
6
6
7
6
July
5.6
5
6
5
6
August
5.6
6
6
5
6
September
6.0
6
5
5
6
October
6.3
5
6
6
6
November
6.7
6
7
6
7
December
6.6
6
9
6
7
Average
6.7
7.2
6.1
6.8
6.3
6.8
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
309°
267°
284°
316°
268°
February
295°
282°
248°
343°
245°
March
324°
351°
254°
251°
069°
April
099°
266°
311°
326°
May
134°
121°
108°
243°
June
117°
175°
207°
178°
July
174°
206°
124°
195°
August
187°
198°
159°
201°
September
055°
269°
193°
131°
October
200°
084°
069°
152°
November
256°
237°
265°
229°
December
243°
326°
255°
263°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.