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
93.2
93
93
84
93
100
February
88.6
81
92
92
86
90
March
92.4
91
95
86
93
94
April
96.0
95
99
99
95
May
94.7
91
94
90
98
June
97.7
96
94
98
99
July
97.7
94
99
100
98
August
98.0
100
99
100
98
September
94.9
93
91
100
97
October
93.4
97
93
99
91
November
92.6
94
87
95
100
December
96.4
94
100
98
90
Average
94.2
88.2
94.3
93.2
96.1
96.2
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
7.3
5
6
9
6
9
February
7.9
11
10
6
3
4
March
13.1
13
11
13
12
14
April
17.5
18
19
17
17
May
21.7
22
23
20
24
June
28.3
26
28
28
30
July
30.4
30
31
29
32
August
29.6
30
30
31
32
September
26.8
27
28
28
26
October
18.2
19
19
20
19
November
13.1
14
10
16
15
December
8.6
10
8
11
7
Average
17.6
9.7
18.5
19.0
18.6
19.4
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
-6.1
-7
-7
-7
-4
-6
February
-6.1
-2
-7
-9
-9
-7
March
-2.3
-1
-4
-3
-2
-1
April
2.1
1
2
1
3
May
7.0
8
7
7
7
June
12.4
11
13
14
13
July
15.0
14
16
16
15
August
14.3
15
14
15
15
September
11.5
11
11
12
10
October
2.9
3
5
4
2
November
-2.3
-1
-5
-1
-1
December
-5.1
-3
-7
-2
-5
Average
2.9
-4.5
3.5
3.6
4.5
4.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.9
5
9
11
2
0
February
8.6
18
9
10
4
12
March
6.8
11
3
17
8
2
April
4.6
7
1
2
6
May
5.9
6
9
10
2
June
3.7
7
8
2
3
July
3.5
3
5
1
4
August
2.1
2
5
1
2
September
3.2
5
5
1
3
October
3.9
4
4
0
4
November
5.3
6
14
0
1
December
2.2
3
0
1
5
Average
5.2
11.4
5.2
7.5
2.8
3.0
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
7.6
8
7
8
7
8
February
8.6
8
10
7
7
10
March
9.9
10
11
11
10
9
April
10.1
9
13
9
9
May
9.3
8
11
9
9
June
8.6
8
9
7
10
July
7.3
7
8
6
8
August
7.3
8
7
7
8
September
7.9
8
7
8
8
October
8.1
7
8
8
10
November
7.3
7
9
6
9
December
7.2
7
8
10
7
Average
8.3
8.4
8.0
9.0
8.0
8.6
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
002°
354°
356°
180°
185°
February
270°
237°
135°
172°
357°
March
245°
204°
039°
305°
200°
April
214°
219°
044°
165°
May
139°
197°
115°
131°
June
152°
176°
097°
210°
July
033°
059°
056°
079°
August
106°
055°
178°
070°
September
159°
117°
131°
059°
October
179°
132°
171°
157°
November
146°
138°
188°
208°
December
338°
206°
221°
029°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.