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
91.9
96
91
84
88
100
February
86.7
87
91
90
79
84
March
90.8
93
93
87
89
85
April
95.5
97
100
98
94
May
93.4
93
92
86
97
June
97.9
95
93
100
100
July
97.9
94
100
99
97
August
98.0
99
99
100
98
September
95.7
98
92
100
96
October
93.3
98
94
97
93
November
93.9
96
91
99
100
December
95.3
91
99
100
92
Average
94.0
91.7
94.8
93.3
94.5
94.7
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
7.6
6
6
10
7
8
February
8.0
11
10
6
4
6
March
13.0
13
11
14
12
14
April
17.3
17
20
16
17
May
21.5
21
24
20
24
June
27.9
24
28
29
30
July
30.2
30
31
30
31
August
29.3
29
29
31
31
September
26.9
27
28
28
26
October
18.1
19
19
20
19
November
13.1
14
11
16
15
December
9.1
10
8
13
9
Average
17.5
9.7
18.1
19.3
18.7
19.2
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
-5
-6
-6
-5
February
-6.2
-2
-5
-8
-9
-7
March
-2.7
-1
-3
-1
-1
0
April
2.0
1
3
1
2
May
7.5
9
8
8
8
June
12.6
12
13
14
13
July
15.6
16
16
16
16
August
14.8
15
15
16
16
September
11.6
12
12
12
10
October
3.2
4
5
5
3
November
-2.6
-1
-4
1
-1
December
-5.4
-3
-6
-2
-5
Average
3.2
-4.8
4.1
4.4
4.5
4.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.6
9
10
13
7
0
February
11.2
12
10
9
12
19
March
9.4
8
7
21
13
9
April
5.7
6
1
3
8
May
7.2
7
10
14
2
June
2.4
4
5
3
3
July
2.1
3
3
1
4
August
1.4
1
2
0
1
September
3.6
6
7
1
3
October
6.1
2
5
2
4
November
5.2
8
10
1
1
December
5.1
8
2
1
8
Average
6.0
9.7
5.7
7.2
4.8
5.0
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
8.3
9
9
8
7
9
February
9.4
9
11
8
8
10
March
10.8
10
12
11
10
10
April
10.8
10
14
11
9
May
10.3
10
12
10
11
June
9.1
9
10
8
10
July
8.1
8
8
8
9
August
7.8
8
8
8
8
September
8.4
8
8
8
8
October
8.8
9
9
8
9
November
8.3
8
9
8
9
December
8.7
8
9
11
9
Average
9.1
9.3
9.0
9.5
8.9
9.1
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
344°
020°
051°
086°
196°
February
248°
252°
138°
171°
032°
March
252°
187°
006°
028°
186°
April
196°
229°
027°
060°
May
136°
190°
133°
137°
June
141°
175°
124°
188°
July
067°
071°
089°
138°
August
114°
107°
166°
126°
September
167°
123°
144°
108°
October
167°
200°
172°
127°
November
158°
136°
153°
178°
December
348°
168°
211°
358°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.