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
88.7
82
93
95
89
78
February
83.6
92
87
90
74
90
March
91.1
95
86
96
96
79
April
92.0
98
98
88
92
May
92.1
96
92
79
97
June
95.6
97
100
95
99
July
98.5
100
100
97
96
August
96.6
100
95
96
96
September
94.0
98
99
99
87
October
89.4
90
95
95
82
November
89.6
91
81
99
92
December
86.2
89
80
93
86
Average
91.6
89.9
93.9
94.0
91.9
89.7
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
13.5
10
16
14
12
16
February
16.0
20
17
14
12
16
March
21.0
21
20
21
21
23
April
23.7
23
26
22
25
May
28.1
28
30
25
29
June
32.4
33
33
31
33
July
35.1
37
38
33
34
August
34.6
39
34
33
35
September
30.9
34
32
32
28
October
24.6
25
25
27
24
November
19.0
19
16
20
21
December
15.5
16
15
21
15
Average
23.7
17.0
25.5
25.3
24.2
24.9
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
1.1
-1
3
-2
2
5
February
3.2
6
3
-1
1
4
March
8.2
9
7
5
8
13
April
11.0
10
12
10
12
May
16.7
17
17
16
18
June
20.6
20
22
19
21
July
22.3
21
23
22
24
August
21.6
23
22
22
21
September
18.9
21
18
18
17
October
11.7
13
11
13
10
November
5.8
6
5
6
7
December
3.8
4
6
7
2
Average
11.2
4.4
12.3
11.8
12.2
12.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.3
7
4
1
4
9
February
6.5
6
8
7
4
6
March
3.7
4
4
2
3
10
April
3.6
3
3
8
2
May
4.3
1
2
12
5
June
2.6
1
2
4
4
July
2.0
3
3
1
2
August
3.2
0
5
5
1
September
4.2
2
1
1
7
October
6.0
6
6
2
3
November
4.2
7
7
2
2
December
5.5
4
7
1
7
Average
4.2
5.5
3.4
3.5
4.0
4.7
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
7.9
7
8
8
8
8
February
8.4
8
8
9
9
9
March
7.9
8
2
10
9
7
April
7.9
0
11
8
8
May
6.4
0
9
6
7
June
6.3
5
7
6
7
July
5.4
6
6
5
6
August
5.8
6
6
6
6
September
5.7
6
5
6
5
October
7.1
7
6
7
7
November
7.2
6
7
8
8
December
7.3
7
7
8
8
Average
7.0
7.9
4.9
7.6
6.9
7.0
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
309°
256°
302°
305°
203°
February
263°
242°
294°
337°
294°
March
182°
275°
234°
185°
183°
April
360°
176°
156°
190°
May
360°
159°
142°
147°
June
136°
152°
165°
173°
July
177°
164°
160°
162°
August
145°
144°
169°
153°
September
159°
151°
159°
093°
October
109°
174°
185°
139°
November
177°
177°
181°
177°
December
260°
228°
191°
284°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.