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
87.9
74
94
92
91
84
February
85.6
96
96
87
75
91
March
91.1
91
90
92
93
84
April
93.0
96
93
97
95
92
May
92.7
91
89
89
93
June
97.1
97
98
95
98
July
98.4
96
99
99
97
August
97.7
100
98
98
99
September
94.8
96
99
100
90
October
92.3
91
98
97
82
November
91.0
92
83
98
93
December
88.5
89
68
99
87
Average
92.4
89.3
93.7
92.8
94.1
91.0
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
11.0
7
14
12
10
13
February
12.8
17
14
13
5
13
March
19.0
20
17
19
20
20
April
22.7
24
22
25
22
22
May
26.8
26
28
25
26
June
31.9
31
33
31
33
July
34.7
34
39
33
34
August
33.8
36
36
34
33
September
30.5
32
32
33
28
October
23.3
24
24
26
22
November
17.0
18
14
18
19
December
13.2
14
12
19
13
Average
22.4
16.9
23.4
24.3
23.1
22.9
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
-2.9
-4
1
-4
1
2
February
0.6
5
1
-2
-5
1
March
6.6
8
5
5
8
9
April
10.2
12
9
12
10
10
May
16.4
16
18
16
16
June
21.0
20
22
21
21
July
23.7
23
26
22
24
August
22.4
23
23
23
22
September
19.2
20
18
20
16
October
11.3
12
11
13
10
November
5.0
6
4
6
8
December
1.9
3
3
5
0
Average
10.7
5.1
11.5
11.7
11.7
11.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.1
7
3
3
2
9
February
6.5
7
3
9
11
7
March
3.8
6
3
5
5
7
April
4.8
3
7
0
5
2
May
4.5
6
8
8
4
June
1.9
3
2
2
3
July
1.9
3
2
2
4
August
2.7
1
3
1
1
September
4.4
4
4
1
3
October
6.3
8
4
1
5
November
3.4
3
7
0
2
December
3.3
1
4
1
8
Average
4.1
5.7
3.7
4.0
3.1
4.3
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
11.2
10
11
12
11
12
February
12.0
12
12
13
12
11
March
12.5
12
12
13
14
11
April
13.2
14
13
15
13
12
May
11.0
8
13
11
11
June
10.8
8
11
10
13
July
9.2
10
10
8
10
August
9.2
9
9
10
9
September
9.6
10
9
11
8
October
11.1
12
10
11
11
November
11.0
10
11
12
12
December
10.5
11
10
11
11
Average
11.1
12.1
10.3
11.4
11.0
10.8
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
318°
242°
302°
312°
218°
February
222°
230°
296°
004°
307°
March
207°
280°
234°
196°
169°
April
180°
175°
178°
185°
182°
May
165°
166°
139°
118°
June
132°
169°
173°
184°
July
184°
173°
179°
157°
August
152°
177°
178°
154°
September
153°
172°
181°
161°
October
186°
220°
206°
166°
November
190°
195°
201°
191°
December
224°
208°
199°
297°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.