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
84.0
69
91
94
83
74
February
89.8
94
98
94
87
95
March
90.0
94
91
93
88
81
April
93.6
93
98
96
92
93
May
92.3
94
86
92
89
June
98.4
100
98
96
99
July
98.0
97
99
94
98
August
96.7
100
99
99
94
September
94.5
98
98
98
88
October
92.0
94
97
94
87
November
91.4
95
90
98
92
December
89.2
83
71
97
95
Average
92.3
87.6
95.0
93.7
93.2
90.4
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
7.9
5
10
10
8
8
February
10.4
16
12
10
3
10
March
16.7
19
15
16
18
17
April
21.6
23
24
22
21
21
May
24.8
26
25
23
23
June
29.8
31
31
32
33
July
29.7
34
36
32
33
August
32.5
36
36
33
32
September
30.0
32
32
31
27
October
21.9
23
24
24
20
November
15.2
20
14
17
18
December
11.1
11
10
16
11
Average
20.4
15.6
23.0
22.5
21.5
21.3
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
-3.2
-5
-1
-5
-1
-1
February
-2.3
3
-2
-4
-7
-1
March
4.1
5
3
3
6
6
April
8.1
10
7
9
7
7
May
12.4
12
11
13
13
June
12.0
5
11
19
21
July
15.1
10
20
21
22
August
19.0
17
15
22
19
September
17.3
18
16
18
15
October
9.4
11
9
11
8
November
3.1
6
2
4
5
December
-1.9
2
0
2
-1
Average
7.5
3.1
7.4
7.4
9.7
9.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.1
9
4
4
5
6
February
5.3
3
2
7
17
7
March
3.7
3
2
6
6
3
April
4.3
3
3
1
7
2
May
7.6
5
11
10
11
June
3.4
4
4
7
2
July
2.8
4
3
4
5
August
2.6
2
1
2
1
September
3.3
4
2
3
4
October
4.5
7
2
4
2
November
2.9
0
5
1
3
December
2.3
5
1
0
3
Average
4.0
4.2
3.5
4.0
5.4
4.0
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
9.4
8
9
9
10
10
February
10.4
11
11
10
10
10
March
12.0
13
12
12
13
10
April
12.7
13
13
15
12
11
May
9.9
9
12
10
9
June
9.4
7
9
8
12
July
7.7
8
8
7
8
August
8.0
8
8
9
8
September
9.1
9
10
9
9
October
10.6
12
10
10
11
November
10.5
10
12
11
12
December
9.5
10
10
10
9
Average
10.1
11.5
9.6
10.4
9.8
9.7
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
281°
277°
308°
306°
297°
February
228°
223°
306°
019°
321°
March
218°
262°
251°
182°
191°
April
190°
217°
195°
244°
232°
May
154°
146°
138°
074°
June
143°
169°
180°
184°
July
192°
154°
170°
164°
August
218°
164°
179°
164°
September
172°
165°
187°
181°
October
251°
228°
249°
203°
November
187°
231°
219°
204°
December
244°
224°
211°
295°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.