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
83.4
65
85
96
83
80
February
89.8
89
98
93
87
88
March
90.7
93
94
93
88
80
April
94.8
94
99
97
96
96
May
92.0
94
83
90
91
June
98.3
99
97
98
99
July
97.3
95
96
99
98
August
96.8
100
99
97
99
September
94.5
96
97
99
89
October
92.3
93
99
95
91
November
89.7
83
88
96
95
December
90.2
80
80
98
96
Average
92.1
85.6
93.1
93.5
93.9
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
6.9
2
7
8
9
7
February
9.4
15
11
9
3
9
March
15.5
17
13
16
18
16
April
20.9
23
22
21
20
21
May
25.3
27
25
24
23
June
32.3
31
32
33
34
July
33.9
35
35
33
33
August
32.7
35
35
35
32
September
29.9
31
31
32
28
October
21.3
22
23
24
20
November
14.2
14
13
17
17
December
10.0
10
8
15
11
Average
20.2
14.0
21.6
21.9
21.8
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
-6.8
-8
-4
-8
-3
-4
February
-5.7
0
-5
-7
-8
-4
March
2.0
2
1
0
4
4
April
6.2
8
6
7
6
5
May
12.9
13
14
13
12
June
18.8
18
19
20
19
July
20.8
21
21
20
22
August
19.4
20
19
21
18
September
16.3
16
16
17
13
October
7.7
9
7
10
7
November
0.9
1
0
3
3
December
-3.1
-1
-3
-2
-3
Average
6.9
0.3
7.9
7.4
8.6
7.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.3
8
7
3
5
6
February
4.4
3
1
9
10
6
March
3.1
1
2
9
6
1
April
3.2
2
2
2
3
2
May
4.9
5
11
5
7
June
1.5
4
1
1
2
July
1.9
2
4
2
2
August
1.3
1
0
0
1
September
2.9
5
2
2
5
October
3.8
2
2
3
3
November
4.2
9
4
1
2
December
2.5
5
1
0
6
Average
3.2
3.5
3.6
4.1
3.0
3.3
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
10.0
9
9
10
11
10
February
10.6
10
11
11
10
10
March
12.3
12
12
12
13
11
April
13.0
14
13
15
13
11
May
10.0
9
11
10
9
June
10.1
7
10
8
13
July
8.4
9
9
8
8
August
8.5
8
8
10
9
September
9.8
9
10
10
9
October
10.7
12
10
10
10
November
10.6
9
12
10
12
December
9.8
10
10
9
9
Average
10.4
11.3
9.9
10.7
10.2
10.1
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
308°
317°
305°
321°
312°
February
246°
236°
335°
012°
336°
March
322°
345°
340°
175°
173°
April
207°
211°
199°
236°
271°
May
144°
136°
136°
066°
June
132°
170°
169°
178°
July
171°
148°
159°
150°
August
199°
150°
169°
153°
September
160°
155°
170°
167°
October
171°
213°
273°
177°
November
161°
232°
221°
192°
December
281°
221°
212°
312°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.