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
89.1
86
86
92
90
92
February
84.6
94
84
86
75
86
March
93.2
92
97
96
93
85
April
95.3
92
96
99
97
May
96.1
95
98
95
97
June
96.0
94
98
96
98
July
94.1
95
97
86
95
August
91.3
95
90
92
97
September
95.7
96
96
95
96
October
94.2
97
100
93
92
November
93.0
94
92
92
93
December
88.6
90
82
87
89
Average
92.5
90.6
93.0
94.3
91.3
93.3
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
11.0
9
14
10
11
13
February
15.0
17
17
14
10
13
March
18.3
19
18
19
20
20
April
22.0
22
22
22
21
May
26.6
26
27
26
25
June
29.9
30
32
29
30
July
31.6
32
33
31
32
August
30.5
31
30
31
31
September
28.6
29
28
28
27
October
23.2
24
22
24
24
November
16.9
18
17
16
19
December
13.5
14
13
18
12
Average
21.3
14.7
22.9
22.6
22.0
22.1
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
1.4
-1
4
-1
1
4
February
4.1
4
6
1
0
3
March
6.8
8
6
6
7
11
April
9.3
10
9
8
9
May
13.9
14
9
13
14
June
17.7
18
12
19
19
July
19.9
21
15
21
21
August
19.6
21
19
21
18
September
16.4
17
16
17
17
October
11.2
11
7
14
12
November
4.1
5
5
2
6
December
3.3
2
6
7
0
Average
9.8
3.6
11.2
8.6
10.9
11.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.7
13
10
11
7
14
February
12.2
7
9
9
16
19
March
7.0
10
6
5
8
11
April
4.4
9
3
4
4
May
3.8
5
4
4
7
June
3.9
3
1
6
3
July
3.0
3
1
6
2
August
4.3
4
6
7
4
September
3.4
2
3
6
6
October
6.3
4
1
6
8
November
5.1
6
7
4
7
December
9.0
7
17
6
5
Average
6.2
9.8
5.2
4.8
6.3
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
7.1
8
6
8
7
7
February
7.6
8
8
9
8
8
March
6.9
8
2
9
6
8
April
6.0
0
8
5
8
May
5.4
1
7
7
6
June
4.6
6
5
6
6
July
4.3
5
6
5
4
August
4.3
5
4
5
5
September
4.7
5
5
5
6
October
5.7
7
5
6
5
November
5.9
6
5
7
6
December
6.3
6
7
7
5
Average
5.9
7.7
4.5
6.4
5.8
6.1
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
242°
232°
319°
258°
194°
February
223°
221°
187°
315°
259°
March
219°
200°
215°
133°
205°
April
360°
204°
253°
298°
May
029°
194°
168°
187°
June
268°
323°
172°
197°
July
273°
231°
209°
214°
August
311°
207°
155°
224°
September
026°
019°
092°
127°
October
238°
321°
201°
174°
November
226°
043°
271°
134°
December
221°
200°
196°
256°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.