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
89.9
77
96
95
92
84
February
89.3
92
97
92
74
92
March
91.2
92
95
98
88
80
April
81.2
92
98
92
94
May
79.5
92
90
87
95
June
84.1
98
96
94
99
July
98.4
97
99
98
97
August
97.6
100
100
98
97
September
94.6
95
99
99
90
October
93.4
95
99
97
86
November
86.8
91
89
95
91
December
91.3
91
76
100
86
Average
89.7
87.0
94.9
95.2
92.8
91.2
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
10.3
7
12
11
9
12
February
12.0
16
13
12
4
11
March
18.4
18
17
18
19
18
April
21.3
22
25
20
21
May
26.9
26
28
24
26
June
32.1
31
33
32
33
July
34.5
34
38
32
34
August
33.4
35
35
33
33
September
30.4
32
33
33
27
October
22.6
24
24
25
21
November
15.4
17
14
18
18
December
12.1
13
11
18
11
Average
21.7
13.5
23.0
23.9
22.1
22.0
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
-3.9
-5
-1
-5
-1
-1
February
-1.1
3
-1
-3
-7
-1
March
5.0
5
3
3
5
7
April
7.3
7
9
8
8
May
15.2
15
16
14
14
June
19.6
19
21
20
20
July
21.9
22
24
21
22
August
21.1
22
22
22
20
September
17.8
18
18
18
15
October
9.8
10
10
12
8
November
3.7
4
3
5
6
December
0.2
1
1
2
-2
Average
9.2
1.1
9.9
10.0
9.9
9.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.6
6
5
4
2
5
February
6.6
8
2
9
17
4
March
3.4
5
1
4
6
5
April
2.7
4
0
5
2
May
3.5
8
6
6
2
June
1.7
3
1
4
1
July
1.1
1
2
1
2
August
2.2
1
3
1
0
September
3.3
4
0
0
3
October
4.0
5
2
1
7
November
3.0
5
9
1
3
December
2.7
3
2
1
8
Average
3.3
6.4
3.3
3.2
3.5
3.1
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
10.2
9
10
11
11
11
February
11.3
12
12
12
11
11
March
11.9
11
13
13
13
11
April
12.4
12
15
12
12
May
9.8
8
12
10
11
June
9.8
8
11
9
12
July
8.1
9
9
8
9
August
8.2
8
8
10
9
September
9.1
9
10
10
9
October
10.1
11
10
10
10
November
9.7
10
11
11
11
December
9.9
10
10
11
10
Average
10.0
10.8
9.7
10.9
10.4
10.2
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
311°
255°
305°
311°
294°
February
242°
245°
311°
357°
318°
March
220°
317°
248°
201°
147°
April
181°
185°
200°
196°
May
145°
157°
115°
090°
June
120°
164°
167°
185°
July
183°
162°
165°
138°
August
129°
163°
167°
135°
September
147°
174°
180°
166°
October
272°
216°
219°
172°
November
206°
224°
211°
199°
December
253°
226°
208°
311°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.