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
90.5
96
93
88
82
95
February
89.9
99
88
92
81
88
March
94.1
95
96
95
93
91
April
95.6
96
93
95
99
96
May
94.4
96
93
94
96
June
92.1
89
94
96
91
July
88.3
88
90
85
89
August
87.4
89
89
84
88
September
89.7
87
89
87
93
October
91.1
94
95
89
88
November
92.5
97
91
95
91
December
91.6
95
88
93
94
Average
92.0
96.6
91.7
91.9
89.7
91.6
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
9.6
9
11
9
10
11
February
14.2
15
16
14
12
12
March
16.7
18
17
18
18
18
April
20.2
21
21
20
20
20
May
24.4
23
26
23
22
June
27.2
26
29
27
26
July
28.8
29
29
28
30
August
28.3
29
28
28
28
September
25.4
26
26
25
25
October
21.3
21
20
21
22
November
15.4
16
16
15
18
December
12.7
13
12
16
11
Average
19.9
15.8
21.3
20.7
20.2
20.2
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
-2.8
-2
3
-3
0
1
February
2.8
1
5
1
1
2
March
4.6
5
4
4
6
8
April
6.9
9
8
6
6
6
May
12.4
12
13
11
11
June
15.9
14
17
16
16
July
15.7
18
4
18
19
August
18.0
18
18
18
19
September
13.8
14
13
14
15
October
9.0
8
5
11
10
November
2.4
3
4
0
5
December
1.6
0
4
3
-1
Average
7.9
3.1
9.2
7.2
8.6
9.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.5
15
15
10
13
17
February
14.0
5
13
10
16
24
March
9.6
11
11
5
10
15
April
7.8
10
11
5
4
7
May
4.2
2
5
3
4
June
4.5
7
2
6
5
July
3.9
4
3
7
3
August
5.1
3
4
9
5
September
4.0
2
6
4
7
October
6.1
2
0
9
5
November
6.0
6
8
2
4
December
12.1
10
15
10
7
Average
7.6
10.2
6.1
5.4
7.3
8.0
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
4.5
5
4
4
4
5
February
4.8
5
5
6
5
5
March
5.4
5
5
6
5
5
April
5.3
5
5
5
5
5
May
4.2
5
4
4
5
June
3.4
3
3
4
3
July
2.7
2
3
3
3
August
2.7
3
3
3
3
September
3.1
3
3
3
4
October
3.9
4
4
4
3
November
4.2
4
5
3
5
December
4.2
4
4
4
4
Average
4.1
5.1
3.8
4.1
3.9
3.9
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
340°
270°
277°
284°
132°
February
242°
223°
109°
300°
252°
March
140°
244°
203°
173°
219°
April
242°
210°
203°
287°
277°
May
123°
208°
185°
185°
June
303°
035°
161°
251°
July
303°
236°
241°
135°
August
321°
154°
146°
199°
September
111°
051°
044°
128°
October
236°
282°
128°
120°
November
096°
133°
286°
097°
December
169°
115°
201°
226°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.