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
88.2
80
91
98
86
87
February
88.4
100
89
95
75
88
March
94.1
93
95
100
98
88
April
92.0
95
93
86
88
May
95.2
96
90
99
June
98.2
98
97
99
July
98.6
100
96
99
August
97.7
100
97
91
100
September
94.5
98
99
97
86
October
90.9
93
100
94
91
November
91.3
88
88
96
95
December
91.3
92
85
97
91
Average
93.4
91.8
94.6
95.9
92.1
92.8
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
15.5
14
18
16
15
18
February
16.8
20
19
15
13
17
March
22.2
22
23
23
22
23
April
25.6
27
26
24
25
May
28.9
29
27
30
June
33.0
35
32
33
July
34.9
37
32
36
August
35.1
38
32
32
36
September
31.3
34
32
32
29
October
25.8
26
26
27
27
November
19.7
19
18
21
23
December
18.2
18
18
24
17
Average
24.6
20.7
26.8
21.6
25.0
26.1
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
1
5
1
3
5
February
4.0
8
5
0
1
4
March
9.6
11
10
6
9
13
April
12.3
15
13
12
12
May
17.3
17
16
17
June
20.9
21
21
20
July
22.6
24
22
23
August
22.3
24
22
19
23
September
19.8
22
19
19
17
October
13.4
15
14
15
12
November
7.3
8
7
9
9
December
5.5
6
9
10
3
Average
12.2
8.4
14.1
8.8
12.9
13.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.3
5
3
1
3
3
February
2.2
1
1
3
4
4
March
0.5
1
0
0
0
2
April
1.1
1
0
4
1
May
1.2
1
2
2
June
0.5
1
1
0
July
0.5
0
2
0
August
0.6
0
2
0
0
September
1.6
1
1
0
3
October
3.5
3
1
0
3
November
1.8
3
4
0
1
December
2.2
2
0
0
4
Average
1.5
1.7
1.2
1.4
1.3
1.7
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
9.5
9
10
9
10
9
February
10.2
10
11
10
10
11
March
10.3
10
11
12
11
9
April
10.5
11
11
10
10
May
9.0
7
9
9
June
8.5
8
8
9
July
7.4
7
7
8
August
7.6
8
6
7
8
September
7.3
8
7
6
8
October
8.8
9
8
9
9
November
8.9
8
9
9
9
December
9.1
9
9
9
11
Average
9.0
9.8
8.8
8.7
8.7
9.1
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
292°
270°
301°
310°
238°
February
261°
257°
323°
324°
291°
March
201°
205°
241°
185°
169°
April
165°
159°
140°
174°
May
151°
127°
155°
June
177°
154°
160°
July
173°
151°
163°
August
159°
097°
176°
170°
September
181°
137°
142°
047°
October
135°
182°
198°
183°
November
231°
215°
185°
187°
December
247°
192°
216°
289°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.