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
76.1
71
77
87
75
72
February
86.3
94
97
87
88
82
March
88.8
93
87
94
90
84
April
93.5
99
94
95
92
May
92.6
97
88
93
90
June
95.7
94
98
95
95
July
94.3
98
91
89
92
August
93.2
93
93
94
86
September
94.0
96
94
94
86
October
88.9
93
94
80
90
November
92.4
95
94
98
94
December
86.1
84
82
82
96
Average
90.2
86.4
93.0
92.0
89.9
88.3
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
4.0
2
7
2
4
6
February
7.9
12
11
6
1
6
March
12.9
17
12
14
15
13
April
18.3
20
17
19
17
May
24.3
25
25
22
22
June
29.0
29
30
29
30
July
30.3
31
30
29
31
August
28.6
27
29
30
28
September
27.6
28
26
28
26
October
19.6
18
20
21
19
November
11.7
14
13
11
15
December
8.0
9
7
12
7
Average
17.6
10.4
19.2
18.9
18.4
18.2
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
-4.5
-5
0
-8
-3
-1
February
-2.1
0
0
-5
-7
-2
March
2.7
5
2
2
4
4
April
6.9
7
7
7
6
May
13.3
13
14
11
12
June
16.8
16
18
19
17
July
19.7
20
20
18
20
August
17.6
16
18
19
18
September
14.8
14
14
14
14
October
8.2
7
7
11
6
November
1.3
2
2
1
4
December
-1.4
2
0
2
-2
Average
7.1
0.3
8.0
8.0
8.1
7.9
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
11
11
11
17
11
February
11.1
3
4
19
15
22
March
9.7
4
10
11
10
10
April
7.7
2
9
11
8
May
6.3
3
6
8
7
June
3.0
1
3
4
4
July
3.4
1
5
4
5
August
3.2
5
1
1
4
September
2.7
2
4
6
2
October
7.5
8
4
9
7
November
5.3
3
4
2
6
December
8.5
10
8
7
6
Average
6.4
5.6
4.6
6.5
7.6
7.2
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
7
8
8
7
7
February
7.8
8
8
8
8
7
March
8.5
10
9
9
8
7
April
8.3
8
9
8
7
May
6.4
6
8
5
6
June
5.4
5
5
5
5
July
4.0
5
4
3
1
August
3.9
5
4
4
2
September
4.7
5
4
5
5
October
6.8
7
7
6
7
November
7.3
6
8
7
8
December
7.3
7
7
8
7
Average
6.6
8.2
6.5
6.5
6.1
5.5
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
233°
241°
273°
247°
223°
February
215°
215°
223°
306°
272°
March
199°
221°
215°
140°
219°
April
202°
197°
222°
247°
May
085°
152°
145°
211°
June
334°
210°
178°
170°
July
220°
198°
232°
201°
August
218°
203°
161°
205°
September
168°
268°
202°
190°
October
237°
201°
215°
234°
November
219°
202°
224°
199°
December
202°
171°
198°
226°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.