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
79.5
71
77
88
81
79
February
86.8
94
92
77
94
87
March
91.4
93
92
93
92
90
April
94.3
98
93
98
93
May
93.2
91
88
96
92
June
97.0
91
98
97
99
July
95.2
94
89
94
96
August
95.3
88
96
96
96
September
95.6
97
93
95
93
October
89.7
91
86
86
87
November
91.7
92
90
100
94
December
88.4
85
76
86
99
Average
91.3
85.9
91.0
89.7
93.3
92.4
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
5.2
3
8
4
4
6
February
9.2
15
12
7
1
8
March
14.2
18
13
16
16
15
April
19.3
21
19
19
18
May
25.0
26
25
23
22
June
30.4
30
31
30
30
July
31.6
32
32
30
31
August
29.8
30
30
31
29
September
27.9
28
27
29
27
October
20.8
21
21
22
19
November
12.9
15
14
13
16
December
9.4
11
8
14
8
Average
18.7
12.1
20.5
19.9
19.7
19.1
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
-4.7
-4
0
-7
-2
-2
February
-2.2
1
0
-5
-7
-2
March
3.2
5
2
3
5
5
April
7.3
7
7
7
7
May
13.7
13
15
12
13
June
18.3
17
19
20
18
July
19.8
20
22
20
22
August
18.7
20
20
20
19
September
15.9
15
15
15
15
October
8.7
9
6
12
7
November
1.5
2
2
1
4
December
-1.4
2
0
2
-2
Average
7.5
0.7
9.0
8.3
8.9
8.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.6
14
10
11
16
10
February
10.7
4
9
25
10
14
March
9.4
8
11
13
8
9
April
8.6
2
13
8
9
May
6.3
3
8
6
8
June
3.7
3
6
2
4
July
5.0
7
11
3
4
August
4.3
5
4
2
3
September
3.9
3
6
4
3
October
6.9
10
11
5
6
November
4.8
7
4
0
5
December
8.1
17
7
6
4
Average
7.0
8.4
6.7
9.9
5.4
6.4
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
9
9
7
6
February
7.9
8
8
8
9
8
March
8.8
10
10
10
8
7
April
8.3
9
9
8
7
May
6.9
6
8
7
6
June
5.8
6
5
6
5
July
4.9
6
5
4
4
August
5.0
6
5
5
4
September
5.2
5
5
7
4
October
7.4
9
7
8
6
November
7.2
7
8
8
6
December
7.3
8
7
8
7
Average
7.0
8.4
7.2
7.2
6.8
5.8
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
275°
269°
287°
255°
269°
February
297°
234°
276°
333°
310°
March
240°
238°
240°
151°
275°
April
238°
199°
244°
289°
May
047°
196°
187°
038°
June
354°
239°
209°
172°
July
239°
181°
082°
143°
August
254°
216°
189°
032°
September
262°
333°
223°
174°
October
262°
253°
244°
319°
November
265°
225°
243°
218°
December
242°
191°
232°
270°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.