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
86.8
81
87
93
87
81
February
80.5
91
74
89
79
86
March
88.5
93
67
98
99
77
April
92.8
93
96
94
86
May
92.8
94
94
88
92
June
95.4
93
99
92
97
July
98.8
100
100
97
98
August
96.3
100
93
96
99
September
95.0
98
96
98
89
October
89.6
92
95
92
88
November
89.1
87
82
93
94
December
86.4
92
80
88
83
Average
91.0
88.4
89.9
93.8
92.1
89.4
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
14.3
12
17
15
14
16
February
16.3
21
18
15
11
16
March
21.6
22
22
22
22
22
April
23.9
24
26
23
24
May
28.4
29
30
26
28
June
33.2
35
35
32
33
July
35.2
37
38
33
34
August
35.0
40
35
33
35
September
31.9
36
32
32
29
October
25.8
27
26
28
24
November
19.6
20
17
21
22
December
16.5
18
16
22
16
Average
24.3
18.2
26.8
26.0
24.5
24.8
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
2.9
0
5
0
4
6
February
5.2
8
6
0
1
5
March
10.2
11
11
7
10
13
April
12.4
11
14
12
12
May
18.0
18
19
18
18
June
22.0
22
23
22
22
July
23.3
24
25
23
24
August
23.1
25
23
23
23
September
20.2
22
19
19
19
October
13.6
14
13
15
13
November
7.9
8
8
8
10
December
5.8
5
9
11
4
Average
12.9
6.4
14.1
13.4
13.8
13.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.1
8
5
1
9
3
February
5.9
2
9
3
6
8
March
3.9
4
4
3
2
9
April
2.9
3
2
4
4
May
3.4
2
1
7
6
June
1.4
1
0
2
1
July
0.8
1
0
2
2
August
1.7
1
3
1
1
September
2.1
1
2
1
6
October
5.1
2
4
3
4
November
3.8
6
7
4
0
December
5.3
4
3
1
11
Average
3.4
4.3
2.9
2.2
3.5
4.3
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
8.1
7
9
8
8
8
February
8.7
9
8
8
9
9
March
9.1
8
9
10
10
9
April
9.8
11
12
9
8
May
7.9
5
10
8
8
June
7.1
6
7
7
7
July
6.3
6
8
6
6
August
6.0
7
6
7
6
September
5.8
6
5
6
6
October
7.1
8
6
8
7
November
7.4
6
6
7
8
December
7.4
7
7
9
7
Average
7.6
8.0
7.2
7.7
7.7
7.4
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
299°
228°
286°
295°
172°
February
197°
224°
262°
306°
273°
March
155°
184°
188°
158°
160°
April
105°
154°
126°
135°
May
140°
152°
127°
133°
June
146°
144°
149°
157°
July
169°
158°
150°
154°
August
162°
151°
147°
146°
September
142°
132°
121°
006°
October
133°
162°
190°
091°
November
171°
143°
170°
158°
December
203°
194°
174°
241°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.