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
83.6
75
88
94
80
79
February
88.0
92
96
81
92
87
March
91.4
97
91
85
90
94
April
95.3
99
95
96
96
May
94.8
93
93
94
93
June
97.5
95
98
97
99
July
96.6
95
96
97
97
August
97.0
93
96
98
98
September
95.9
95
95
97
93
October
92.3
96
92
86
92
November
93.9
97
94
99
96
December
89.1
79
80
88
100
Average
92.7
88.3
93.2
92.1
92.9
93.9
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
5.4
3
9
4
5
6
February
9.5
16
12
8
1
8
March
14.2
18
13
15
16
15
April
19.7
21
19
20
19
May
25.4
27
25
24
23
June
30.7
31
31
31
31
July
32.0
32
33
30
32
August
30.2
31
30
31
29
September
28.4
29
27
28
27
October
20.9
22
21
22
19
November
13.2
16
13
13
16
December
9.6
11
7
14
9
Average
19.0
12.3
21.1
19.9
19.6
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
-3.1
-4
1
-7
-2
-1
February
-2.3
1
1
-5
-7
-2
March
3.5
6
3
3
5
5
April
7.6
7
8
7
7
May
14.2
13
15
12
13
June
18.4
17
18
20
19
July
20.7
20
22
20
21
August
19.4
21
19
20
19
September
15.6
14
14
15
14
October
9.2
10
6
12
7
November
1.9
2
2
1
5
December
-1.7
2
1
2
-2
Average
7.9
0.9
9.1
8.4
8.9
8.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.4
13
7
7
14
9
February
8.8
5
6
18
10
12
March
9.5
4
10
14
10
11
April
7.4
1
10
10
8
May
5.8
3
6
6
8
June
2.8
2
3
3
4
July
3.0
2
8
1
3
August
3.1
3
2
1
3
September
2.6
2
6
3
1
October
6.2
7
6
5
7
November
5.0
4
2
2
5
December
7.7
14
7
6
3
Average
6.0
7.0
4.7
7.2
6.0
5.9
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
8.0
7
8
9
7
7
February
8.0
8
8
8
8
8
March
8.7
9
9
9
8
8
April
8.6
9
10
8
8
May
6.8
6
8
7
7
June
5.9
6
6
6
6
July
5.1
5
5
5
5
August
5.1
5
5
5
5
September
5.2
5
5
6
5
October
7.2
7
7
7
7
November
7.2
6
8
7
8
December
7.2
7
7
7
7
Average
7.0
8.1
6.8
7.1
6.7
6.6
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
275°
283°
320°
291°
247°
February
336°
247°
309°
346°
324°
March
235°
293°
259°
111°
218°
April
236°
226°
248°
293°
May
076°
189°
147°
331°
June
007°
225°
198°
175°
July
245°
171°
102°
146°
August
260°
078°
151°
058°
September
143°
345°
226°
116°
October
283°
298°
248°
317°
November
256°
235°
235°
215°
December
236°
202°
229°
265°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.