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
85
91
95
88
81
February
89.6
90
89
93
65
100
March
93.1
93
91
96
100
89
April
95.6
94
99
91
90
May
95.3
95
96
94
92
June
97.1
95
98
100
100
July
99.8
100
100
100
100
August
97.4
100
95
100
100
September
97.8
97
100
100
88
October
93.9
94
95
98
86
November
84.8
85
83
87
100
December
86.0
89
79
96
100
Average
93.0
89.4
93.6
95.0
94.5
93.7
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
12.6
12
18
16
10
13
February
14.8
21
18
16
7
14
March
20.2
22
22
23
19
20
April
22.7
24
27
20
21
May
27.5
29
32
24
27
June
32.7
36
37
30
32
July
34.8
39
40
31
33
August
34.4
41
36
32
34
September
30.7
35
33
31
26
October
24.0
26
27
25
22
November
17.2
19
18
18
16
December
14.3
18
17
19
12
Average
23.1
17.9
27.1
27.1
22.2
22.4
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
3.1
0
5
0
4
6
February
5.2
8
5
0
1
6
March
10.0
11
10
7
10
13
April
12.5
12
14
12
12
May
18.0
18
19
18
17
June
22.4
23
24
22
21
July
23.9
24
25
23
24
August
24.1
26
24
24
23
September
20.3
22
19
19
19
October
13.5
14
12
15
12
November
8.0
8
8
8
10
December
5.8
5
8
10
4
Average
13.0
6.4
14.3
13.6
13.8
14.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.3
5
4
1
0
0
February
3.6
4
4
3
10
0
March
2.6
4
4
2
0
0
April
1.6
3
0
0
0
May
2.3
4
0
10
4
June
0.8
0
0
0
0
July
0.5
1
0
3
0
August
1.9
0
4
3
0
September
1.8
1
1
2
8
October
3.4
3
4
0
0
November
4.0
2
6
3
0
December
5.0
7
3
0
5
Average
2.8
4.1
2.6
1.8
3.0
1.2
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
8.5
8
9
9
8
6
February
9.3
9
9
10
10
8
March
9.5
9
9
11
9
8
April
10.3
9
12
11
10
May
8.2
6
11
9
9
June
7.5
7
8
7
8
July
7.1
7
8
7
7
August
6.8
7
7
5
6
September
5.9
7
5
6
6
October
7.7
8
7
8
8
November
7.0
7
7
8
9
December
7.8
8
7
10
10
Average
8.2
8.7
7.6
8.2
7.9
7.7
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
295°
245°
306°
309°
295°
February
223°
226°
294°
328°
156°
March
156°
179°
203°
162°
183°
April
114°
156°
160°
170°
May
138°
155°
133°
081°
June
139°
140°
156°
146°
July
166°
156°
170°
155°
August
145°
141°
132°
151°
September
149°
128°
110°
117°
October
139°
156°
194°
112°
November
172°
163°
148°
226°
December
210°
196°
183°
253°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.