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
86.5
97
79
84
93
February
89.0
85
91
91
89
100
March
91.4
91
94
91
87
86
April
93.1
91
97
94
87
May
86.6
82
90
89
95
June
94.6
90
99
100
100
July
97.9
98
97
100
100
August
97.3
98
95
100
100
September
93.9
93
95
100
92
October
93.6
92
95
100
91
November
94.9
97
93
100
95
December
95.8
96
97
100
91
Average
93.2
90.7
91.7
93.5
95.9
94.4
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
5.3
6
2
8
5
February
5.0
11
6
6
1
0
March
10.6
13
10
13
7
9
April
15.5
18
19
12
13
May
20.4
22
23
16
20
June
26.3
24
28
27
26
July
30.4
31
33
28
30
August
29.8
31
32
28
29
September
27.1
28
30
25
25
October
18.0
20
19
16
17
November
11.7
14
10
11
11
December
8.0
11
9
8
4
Average
16.0
10.1
18.2
19.6
15.3
17.0
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
-6.1
-7
-7
-6
-3
February
-5.1
0
-6
-7
-8
-4
March
-2.9
-1
-3
-3
0
1
April
2.1
2
2
3
2
May
8.5
10
7
9
9
June
15.5
13
14
21
14
July
18.5
17
19
18
20
August
17.5
17
18
16
19
September
13.2
13
13
14
14
October
5.0
5
6
6
4
November
0.0
1
-3
2
1
December
-4.7
-2
-6
-2
-4
Average
4.1
-3.4
4.9
5.0
6.2
6.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.8
2
5
8
3
February
4.1
0
5
9
2
0
March
3.5
3
0
7
16
5
April
1.6
0
0
6
13
May
2.1
1
4
4
0
June
1.4
1
2
0
1
July
0.2
0
0
0
0
August
0.0
0
0
0
0
September
1.6
0
4
0
2
October
1.4
1
1
0
3
November
1.2
1
1
6
3
December
1.0
0
1
0
7
Average
2.3
1.7
1.1
2.9
2.7
2.7
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
6.7
7
6
7
6
February
7.2
7
8
7
6
8
March
8.6
7
10
10
6
9
April
9.1
8
11
8
7
May
7.9
8
9
4
7
June
7.1
7
8
5
8
July
7.1
7
7
5
8
August
6.7
7
7
6
7
September
6.4
6
7
8
7
October
6.7
6
7
9
8
November
7.2
7
8
7
8
December
8.9
8
11
7
7
Average
7.1
6.8
7.3
8.0
6.2
7.5
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
284°
183°
300°
351°
February
237°
203°
173°
109°
196°
March
154°
067°
344°
160°
177°
April
278°
264°
292°
253°
May
014°
172°
183°
245°
June
147°
211°
229°
224°
July
082°
321°
223°
222°
August
147°
228°
323°
225°
September
210°
240°
087°
130°
October
034°
247°
093°
154°
November
156°
147°
308°
175°
December
311°
248°
203°
312°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.