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
80.4
71
84
92
79
70
February
89.7
95
97
85
91
86
March
92.1
96
90
97
91
90
April
95.5
98
100
95
94
92
May
93.3
97
91
92
91
June
97.8
96
99
98
99
July
96.4
97
96
95
96
August
96.7
95
96
96
100
September
96.4
99
95
98
91
October
90.0
96
90
87
89
November
94.0
99
93
100
96
December
87.5
81
83
89
99
Average
92.5
90.5
94.5
93.2
92.7
91.9
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
3.6
2
8
3
4
5
February
7.5
14
11
7
0
6
March
12.8
17
12
15
15
14
April
18.2
20
20
18
19
17
May
23.8
25
25
23
21
June
29.1
29
30
30
30
July
29.9
31
31
30
30
August
28.3
29
29
31
28
September
27.0
28
26
29
26
October
19.4
20
20
22
18
November
11.5
14
13
13
15
December
7.7
10
7
13
7
Average
17.6
13.0
19.8
19.0
19.1
18.1
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
-8
-2
-2
February
-2.1
0
0
-6
-7
-2
March
3.3
4
2
3
4
5
April
7.8
9
7
7
7
7
May
14.6
13
15
13
14
June
19.3
16
18
21
20
July
21.3
20
21
20
22
August
19.4
18
19
22
18
September
16.2
15
14
17
14
October
9.2
8
6
13
7
November
1.9
2
2
1
5
December
-1.6
2
0
2
-2
Average
8.2
2.3
8.5
7.9
9.2
8.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.3
13
7
6
14
10
February
7.7
2
3
16
12
12
March
7.7
2
10
11
7
7
April
5.7
4
1
11
7
6
May
5.5
1
7
7
6
June
2.6
2
3
2
2
July
3.1
1
6
4
3
August
2.1
3
1
1
2
September
1.8
1
4
2
1
October
5.5
6
6
5
6
November
3.5
3
3
0
4
December
6.5
11
3
6
1
Average
5.1
4.9
3.7
6.2
5.4
4.6
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
9.1
8
10
10
9
9
February
9.2
10
10
10
10
9
March
10.2
11
11
10
10
9
April
10.1
11
11
11
9
10
May
8.4
7
10
9
8
June
7.1
7
7
8
7
July
6.1
6
6
6
6
August
6.1
7
6
6
6
September
6.6
6
7
8
7
October
8.7
9
8
9
9
November
8.7
8
10
9
9
December
8.6
9
9
9
8
Average
8.3
10.0
8.1
8.6
8.2
8.0
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
268°
254°
292°
269°
224°
February
245°
238°
249°
335°
255°
March
223°
228°
228°
134°
190°
April
229°
220°
216°
225°
261°
May
081°
172°
157°
176°
June
014°
227°
195°
182°
July
249°
223°
355°
109°
August
264°
212°
164°
065°
September
169°
335°
210°
187°
October
256°
238°
236°
265°
November
233°
220°
240°
197°
December
227°
203°
216°
240°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.