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
72.9
62
81
51
74
70
February
84.2
93
93
100
87
81
March
89.8
94
89
93
92
76
April
93.1
99
96
94
88
May
93.2
97
88
93
89
June
96.1
94
97
97
98
July
95.7
95
92
92
97
August
95.5
94
94
97
98
September
94.9
95
94
97
89
October
90.6
92
91
84
95
November
91.7
96
94
98
94
December
85.2
75
79
82
95
Average
90.2
83.7
92.2
91.5
91.2
89.5
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
2.7
1
6
0
2
4
February
6.7
12
9
14
0
4
March
11.8
15
11
13
14
13
April
17.7
20
16
18
17
May
24.6
26
25
23
22
June
29.7
30
30
30
30
July
30.0
30
30
29
31
August
28.8
29
29
30
29
September
27.2
27
26
28
25
October
19.3
19
19
21
18
November
10.9
13
13
11
15
December
6.9
8
6
10
6
Average
17.2
9.2
18.9
20.2
18.2
17.8
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
-5.6
-5
-1
-7
-4
-3
February
-3.0
-1
-2
9
-7
-4
March
1.6
4
1
1
3
3
April
5.8
6
6
6
5
May
13.2
12
14
12
12
June
17.8
15
18
19
18
July
19.5
19
20
19
21
August
17.9
19
18
19
17
September
14.8
14
14
15
13
October
8.1
9
5
12
6
November
0.7
1
1
0
3
December
-2.3
2
-1
0
-3
Average
6.8
-1.3
8.0
9.4
8.1
7.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.2
14
9
10
16
8
February
10.2
3
10
0
16
21
March
9.9
6
11
10
10
14
April
8.1
5
9
9
9
May
5.9
2
7
11
8
June
3.4
2
4
6
4
July
3.2
1
6
6
3
August
2.6
6
2
1
2
September
3.0
3
4
2
2
October
7.9
6
10
12
5
November
5.7
4
7
3
3
December
5.9
13
6
3
3
Average
6.3
7.3
5.5
6.4
7.7
6.7
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
6.2
5
7
6
5
6
February
6.9
7
7
5
7
7
March
7.9
8
9
7
8
8
April
7.4
7
8
7
7
May
6.4
6
8
7
7
June
4.9
5
5
5
5
July
3.6
3
4
3
3
August
3.8
4
4
4
3
September
4.3
4
4
5
4
October
6.0
6
6
6
6
November
6.5
6
7
6
7
December
6.2
6
6
7
6
Average
5.9
6.9
5.7
5.9
5.7
5.6
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
253°
244°
279°
233°
229°
February
191°
229°
230°
309°
327°
March
211°
173°
225°
136°
154°
April
206°
197°
232°
271°
May
100°
161°
127°
140°
June
049°
221°
194°
168°
July
211°
188°
064°
150°
August
017°
187°
171°
137°
September
146°
300°
213°
126°
October
234°
211°
150°
223°
November
231°
212°
218°
204°
December
200°
172°
195°
235°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.