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
79.0
70
77
87
82
75
February
83.6
91
90
73
77
84
March
88.6
85
88
92
84
83
April
92.5
96
95
87
91
May
91.9
95
86
92
87
June
94.8
96
97
84
99
July
96.2
94
95
99
98
August
93.6
94
90
97
94
September
92.8
93
92
86
94
October
90.2
89
94
95
81
November
92.3
96
92
97
89
December
87.7
98
60
92
85
Average
89.7
81.8
92.1
89.1
89.6
88.8
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
8.1
5
11
8
8
9
February
12.1
17
14
11
5
11
March
17.0
19
16
17
19
18
April
20.7
21
21
20
20
May
24.9
26
25
23
23
June
29.6
30
31
30
30
July
32.1
32
36
31
32
August
30.5
31
31
32
31
September
28.6
28
28
30
27
October
21.6
22
22
23
20
November
15.3
16
15
16
18
December
11.6
12
9
17
11
Average
20.2
13.5
21.7
21.5
21.0
20.7
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
-2.7
-4
2
-4
0
1
February
0.9
4
2
-2
-4
1
March
5.3
6
5
5
7
7
April
8.8
9
9
8
8
May
14.5
14
16
13
13
June
18.8
18
20
19
19
July
21.3
21
23
21
22
August
20.2
21
21
21
19
September
17.1
16
16
17
16
October
10.3
11
10
13
9
November
3.8
4
4
4
6
December
2.0
3
3
6
0
Average
9.2
2.0
10.7
10.1
10.4
10.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.0
22
9
11
8
7
February
10.0
9
9
11
14
8
March
8.5
8
11
13
5
10
April
7.1
2
7
9
7
May
8.1
4
15
10
10
June
3.4
4
2
3
3
July
4.0
2
2
4
3
August
4.1
3
4
4
4
September
2.5
3
1
1
4
October
8.7
11
6
11
10
November
4.7
4
4
1
1
December
6.0
3
9
11
7
Average
7.0
12.9
5.2
6.9
6.5
6.0
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
5.3
5
5
5
5
5
February
5.8
6
6
6
5
6
March
6.3
6
6
6
7
6
April
6.1
6
7
6
5
May
5.0
4
6
5
5
June
4.0
3
4
4
4
July
3.5
3
4
3
4
August
3.7
3
4
4
4
September
3.8
3
4
5
4
October
4.7
4
5
5
4
November
5.0
4
5
5
6
December
5.4
5
6
6
5
Average
4.9
5.6
4.5
5.0
4.9
4.7
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
169°
196°
237°
210°
177°
February
204°
205°
234°
129°
189°
March
211°
176°
202°
189°
189°
April
198°
196°
198°
201°
May
157°
185°
166°
184°
June
168°
189°
194°
199°
July
198°
184°
197°
191°
August
149°
155°
193°
173°
September
165°
158°
189°
157°
October
195°
190°
204°
185°
November
202°
184°
209°
194°
December
202°
160°
205°
204°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.