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
87.7
72
93
94
90
84
February
84.4
93
91
86
75
91
March
91.2
92
90
95
95
82
April
92.8
95
93
97
93
91
May
93.3
93
90
88
93
June
97.6
98
99
94
99
July
98.5
96
100
99
96
August
98.2
100
100
98
98
September
94.1
97
98
100
88
October
92.0
91
99
97
82
November
90.5
91
80
97
93
December
87.6
88
69
98
87
Average
92.2
88.2
93.6
93.2
93.8
90.6
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
10.4
7
13
11
9
12
February
12.2
17
14
12
5
12
March
18.4
20
16
18
19
19
April
22.0
24
22
24
21
21
May
25.9
26
27
24
25
June
30.9
31
32
30
32
July
33.8
34
37
32
33
August
33.1
36
35
33
33
September
29.7
31
31
32
27
October
22.6
23
24
25
22
November
16.4
18
14
18
18
December
12.6
13
12
19
12
Average
21.7
16.9
23.0
23.4
22.1
22.0
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
-2.4
-4
1
-4
0
0
February
-1.9
4
1
-3
-5
0
March
5.8
7
5
4
6
8
April
9.3
12
9
11
9
8
May
15.2
16
16
14
15
June
19.6
20
21
19
19
July
21.8
21
23
21
22
August
21.3
22
22
22
20
September
18.0
19
18
18
15
October
10.4
11
11
13
8
November
4.0
5
3
5
6
December
1.2
3
3
4
-1
Average
9.7
4.7
11.0
10.5
10.4
10.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.2
11
6
6
7
10
February
10.2
9
6
11
27
8
March
4.9
5
3
5
5
12
April
5.1
3
8
1
5
4
May
4.7
7
6
9
4
June
1.4
2
1
3
1
July
1.2
1
2
1
2
August
2.6
1
4
2
1
September
5.0
4
4
0
5
October
6.8
9
5
0
9
November
5.4
4
14
0
2
December
5.0
3
8
1
9
Average
5.0
6.8
4.5
5.1
4.7
5.4
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
11.4
10
11
12
11
12
February
12.1
13
12
12
12
12
March
12.7
12
13
14
14
11
April
13.3
14
13
16
13
12
May
10.8
8
13
11
11
June
10.0
8
10
9
11
July
8.6
9
9
8
9
August
8.7
9
9
9
8
September
9.1
9
9
10
8
October
10.9
12
10
11
11
November
11.1
10
11
11
12
December
10.5
11
10
11
11
Average
10.9
12.3
10.2
11.2
10.8
10.5
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
345°
255°
322°
321°
253°
February
226°
244°
320°
005°
316°
March
203°
302°
249°
192°
159°
April
175°
169°
175°
173°
187°
May
161°
164°
130°
120°
June
133°
158°
168°
181°
July
181°
169°
177°
152°
August
143°
161°
179°
148°
September
146°
168°
173°
132°
October
187°
217°
208°
143°
November
181°
176°
196°
191°
December
236°
211°
201°
317°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.