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
87.4
82
91
70
95
89
February
89.0
91
93
90
89
86
March
95.8
98
95
95
98
96
April
96.5
98
97
98
95
May
87.6
96
97
99
24
June
97.6
97
99
100
99
July
94.3
99
98
100
92
August
94.4
97
98
99
95
September
89.1
88
96
94
67
October
88.8
90
91
94
79
November
93.6
98
93
89
95
December
87.6
83
86
84
90
Average
91.9
90.6
94.1
93.3
95.3
83.3
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
8.2
8
9
8
9
9
February
7.2
9
8
8
7
8
March
9.9
10
10
11
10
9
April
12.8
12
12
14
14
May
16.1
19
15
16
9
June
19.8
20
19
22
19
July
22.3
23
23
23
21
August
22.4
23
24
22
22
September
19.0
19
20
19
20
October
13.7
14
16
14
14
November
10.1
11
8
11
10
December
7.7
11
5
5
9
Average
13.5
9.0
14.8
14.1
14.3
13.5
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
3.7
3
5
3
5
4
February
2.6
5
3
3
2
3
March
4.3
5
4
6
4
4
April
6.5
6
6
6
6
May
8.3
11
9
9
1
June
11.9
12
12
13
13
July
13.4
14
14
14
13
August
13.3
15
15
14
12
September
11.6
12
12
11
13
October
8.4
9
10
8
9
November
5.7
6
3
7
6
December
3.8
7
1
1
5
Average
7.3
4.1
8.4
7.9
7.8
7.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.2
16
16
11
13
26
February
14.3
13
14
8
18
11
March
10.2
11
12
14
8
7
April
10.9
14
9
8
6
May
5.9
6
12
7
2
June
7.3
6
10
9
12
July
3.4
5
4
1
6
August
2.6
5
2
3
3
September
8.2
5
6
13
7
October
13.1
14
10
26
6
November
14.6
5
13
31
16
December
16.0
16
21
17
15
Average
10.0
13.3
9.3
9.3
11.8
9.1
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
5.8
5
6
5
6
7
February
6.0
5
6
6
6
6
March
5.5
5
6
6
6
6
April
5.9
7
6
5
5
May
4.7
5
6
5
1
June
5.9
7
6
6
6
July
6.1
6
5
6
6
August
5.5
5
6
6
6
September
4.8
4
5
5
5
October
5.3
4
5
6
6
November
5.8
5
5
6
7
December
5.5
4
6
6
5
Average
5.5
4.8
5.5
5.6
5.7
5.4
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
142°
152°
170°
167°
163°
February
216°
166°
189°
153°
189°
March
159°
181°
182°
179°
193°
April
169°
207°
231°
240°
May
183°
182°
197°
239°
June
178°
189°
174°
178°
July
177°
182°
170°
179°
August
195°
190°
176°
189°
September
188°
258°
177°
198°
October
208°
193°
166°
169°
November
210°
110°
171°
173°
December
170°
048°
130°
156°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.