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
89.9
75
92
99
94
85
February
89.6
90
99
89
81
96
March
84.8
95
96
95
86
85
April
92.6
99
90
98
95
98
May
92.8
92
91
94
95
June
96.3
94
94
96
99
July
97.8
93
97
97
99
August
97.3
99
98
97
99
September
94.7
91
97
98
93
October
93.2
94
100
96
94
November
92.3
90
93
96
96
December
93.6
93
87
100
88
Average
92.6
89.1
93.4
95.1
94.2
94.2
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
11.1
9
12
12
9
12
February
12.5
17
15
12
5
12
March
18.8
19
17
19
18
20
April
23.5
27
24
25
22
23
May
27.5
28
29
25
28
June
32.6
31
33
33
34
July
35.1
35
38
33
36
August
34.0
36
35
34
35
September
31.3
32
33
33
29
October
23.6
25
25
26
26
November
17.0
18
15
19
19
December
12.8
13
12
19
10
Average
22.6
17.2
23.8
24.5
23.0
23.4
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
-4.0
-6
-3
-7
-3
-3
February
-4.5
0
-4
-6
-8
-3
March
2.6
3
1
0
3
6
April
6.9
11
6
8
6
6
May
13.1
14
13
13
13
June
18.8
17
20
20
20
July
20.8
20
22
20
21
August
19.7
19
20
21
20
September
16.5
17
16
17
12
October
8.1
10
8
9
8
November
1.2
2
0
3
4
December
-3.7
0
-2
0
-4
Average
7.4
1.4
8.2
8.0
8.6
8.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.2
6
7
2
1
3
February
4.6
8
0
12
7
3
March
2.9
3
0
4
7
6
April
3.0
0
8
1
0
1
May
3.1
5
4
3
1
June
2.4
4
8
1
1
July
1.1
2
2
1
1
August
1.5
0
4
1
1
September
3.1
7
1
1
4
October
4.6
4
3
3
0
November
3.7
7
10
3
1
December
3.5
10
0
0
9
Average
3.1
4.6
4.3
4.1
2.2
2.3
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
10.1
9
9
11
11
10
February
11.7
13
13
12
11
12
March
12.4
12
13
13
12
11
April
13.4
14
13
16
14
13
May
10.9
10
12
11
11
June
11.5
9
13
10
15
July
9.1
9
10
9
9
August
9.3
8
8
11
10
September
10.7
9
10
11
9
October
11.3
11
10
11
11
November
10.7
10
12
10
12
December
10.3
10
11
11
9
Average
11.0
11.8
10.2
11.5
11.0
11.0
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
235°
282°
302°
294°
280°
February
255°
260°
333°
030°
313°
March
240°
214°
302°
199°
200°
April
195°
198°
205°
186°
234°
May
160°
169°
152°
117°
June
155°
176°
173°
187°
July
186°
172°
172°
153°
August
158°
179°
177°
166°
September
170°
180°
189°
200°
October
187°
208°
218°
191°
November
204°
234°
234°
201°
December
263°
237°
223°
315°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.