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
80.6
45
89
97
81
71
February
89.9
95
97
94
82
93
March
88.3
92
89
96
85
79
April
94.6
98
94
94
94
May
88.5
91
85
89
89
June
97.6
100
98
93
99
July
96.8
98
97
95
96
August
96.0
98
99
98
94
September
93.8
98
99
96
86
October
94.0
94
99
95
87
November
92.5
91
92
99
89
December
87.2
84
68
97
93
Average
90.7
87.4
94.4
94.0
92.2
89.3
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
7.5
9
9
8
7
7
February
8.8
16
12
9
2
9
March
15.3
16
15
16
17
17
April
21.0
22
21
20
20
May
23.5
26
24
22
22
June
30.4
32
29
31
32
July
32.4
34
34
31
32
August
32.3
35
34
32
30
September
29.5
31
31
30
26
October
21.0
22
23
23
19
November
15.0
16
13
16
17
December
10.7
11
9
15
11
Average
18.0
14.6
22.2
21.2
20.5
20.1
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
-4.3
0
-3
-7
-3
-3
February
-4.0
1
-3
-6
-9
-3
March
2.5
3
2
1
5
5
April
7.0
6
7
7
6
May
12.8
13
14
13
12
June
18.0
17
17
19
19
July
20.1
18
21
20
21
August
19.3
18
20
20
19
September
16.2
16
15
17
14
October
7.8
9
8
10
7
November
1.5
2
0
3
4
December
-2.4
0
-1
0
-3
Average
5.6
1.8
8.0
7.7
8.5
8.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.1
5
5
4
7
7
February
8.6
4
3
7
23
7
March
4.8
3
4
6
6
4
April
3.2
3
1
6
3
May
6.7
6
9
11
5
June
2.7
2
3
5
3
July
2.3
2
3
3
3
August
1.7
0
2
0
0
September
2.0
3
2
2
2
October
5.3
7
2
6
5
November
3.7
8
4
1
3
December
3.2
3
2
0
3
Average
4.1
3.6
3.8
3.8
5.5
3.5
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
10.7
7
11
11
11
11
February
11.7
12
12
12
11
11
March
12.9
14
13
13
14
11
April
13.4
14
15
13
12
May
10.5
9
12
11
10
June
9.4
8
8
9
12
July
8.8
9
9
7
9
August
8.6
9
9
9
8
September
9.6
10
10
9
9
October
11.5
12
11
11
11
November
11.2
10
12
11
12
December
10.4
10
10
10
10
Average
10.9
12.4
10.5
11.1
10.6
10.5
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
312°
285°
303°
300°
314°
February
234°
221°
300°
006°
317°
March
211°
348°
264°
160°
184°
April
216°
196°
242°
246°
May
145°
141°
138°
050°
June
138°
144°
174°
178°
July
192°
137°
144°
147°
August
196°
144°
159°
151°
September
159°
141°
175°
149°
October
297°
248°
259°
198°
November
175°
247°
210°
201°
December
263°
220°
203°
300°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.