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
82.3
79
81
87
91
75
February
80.4
87
83
83
75
78
March
93.1
93
97
95
95
85
April
93.0
89
97
96
93
May
95.2
95
96
98
97
June
95.1
95
99
92
95
July
95.4
93
95
91
99
August
95.2
96
94
98
94
September
94.2
99
97
92
94
October
91.6
96
98
94
86
November
90.4
94
87
95
98
December
82.7
95
64
86
88
Average
90.8
86.8
93.1
92.5
92.3
90.5
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
8.8
7
14
10
11
13
February
11.7
17
16
13
7
13
March
16.0
19
18
19
21
19
April
18.2
22
22
22
21
May
23.2
27
28
26
26
June
26.3
31
32
30
31
July
27.7
32
34
32
33
August
27.2
32
31
32
32
September
25.5
30
30
29
28
October
20.1
25
23
24
23
November
14.1
18
17
17
20
December
13.2
14
12
18
13
Average
18.7
14.5
23.2
23.0
22.4
22.3
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
0.9
-1
5
-1
3
5
February
3.0
6
6
1
-1
4
March
6.8
9
8
7
9
11
April
8.8
11
11
11
11
May
14.6
16
17
16
16
June
17.1
16
21
21
21
July
19.6
22
23
23
24
August
18.7
22
22
23
22
September
16.1
18
17
18
19
October
10.7
13
11
15
12
November
4.6
6
6
5
8
December
4.1
4
6
9
2
Average
9.7
4.3
12.3
11.9
12.5
12.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.0
11
4
7
6
10
February
9.7
6
6
10
14
12
March
4.9
3
7
5
5
8
April
5.2
5
3
2
4
May
2.6
1
2
4
2
June
3.2
3
1
6
3
July
2.8
2
3
4
1
August
2.4
1
3
5
2
September
2.8
1
1
5
5
October
5.3
3
2
4
5
November
3.6
3
2
2
2
December
6.2
1
9
3
8
Average
4.7
6.5
3.0
3.4
4.7
4.9
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
7.8
8
9
8
8
7
February
8.3
10
10
8
8
8
March
8.5
9
9
9
8
8
April
8.2
9
9
8
7
May
7.2
7
8
8
7
June
6.6
7
6
7
7
July
5.7
7
6
6
6
August
5.6
7
6
6
6
September
5.5
6
6
5
6
October
6.8
8
8
7
7
November
6.6
7
6
6
7
December
7.4
8
7
9
8
Average
7.2
8.9
7.6
7.2
7.0
6.8
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
284°
232°
327°
252°
216°
February
223°
224°
219°
339°
274°
March
208°
227°
222°
166°
205°
April
198°
207°
231°
279°
May
160°
182°
149°
183°
June
264°
144°
176°
183°
July
223°
206°
208°
200°
August
067°
196°
139°
037°
September
075°
359°
117°
067°
October
230°
202°
208°
090°
November
288°
338°
203°
192°
December
232°
225°
206°
224°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.