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
86.4
78
90
91
85
85
February
87.7
97
91
94
84
92
March
92.9
97
86
96
93
87
April
95.2
98
97
97
97
94
May
94.6
96
93
94
93
June
98.1
97
99
97
100
July
97.9
100
98
97
98
August
97.0
100
98
98
99
September
95.3
99
98
98
88
October
88.0
95
97
93
65
November
93.4
96
93
99
93
December
87.9
79
74
94
92
Average
93.1
93.0
93.9
94.7
94.1
90.7
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
9.0
7
12
9
8
10
February
11.7
18
14
11
4
11
March
17.4
21
16
17
18
19
April
21.1
24
22
21
20
20
May
25.0
27
25
23
23
June
30.0
32
30
29
31
July
32.4
33
36
30
32
August
31.4
34
33
31
30
September
27.9
20
31
31
27
October
21.2
20
23
23
19
November
15.9
18
15
16
18
December
11.8
13
11
17
10
Average
20.7
17.1
21.7
22.3
20.7
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
-2.1
-4
0
-4
-1
1
February
0.1
5
2
-3
-5
0
March
5.5
8
5
3
6
7
April
8.6
12
8
9
8
8
May
14.2
14
15
13
13
June
19.0
19
19
19
19
July
20.7
21
22
20
20
August
20.3
22
20
22
19
September
14.7
1
16
17
15
October
8.6
6
9
12
6
November
3.4
5
3
4
6
December
1.3
2
3
5
-1
Average
8.9
4.8
8.7
9.6
9.7
9.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.9
12
7
3
4
8
February
6.4
5
10
3
11
9
March
4.1
2
7
5
5
5
April
4.0
2
5
3
4
5
May
5.8
5
8
10
7
June
2.7
4
3
3
1
July
2.6
2
4
3
5
August
2.9
1
1
2
2
September
2.6
2
1
1
5
October
6.1
5
4
7
4
November
3.3
3
5
1
2
December
3.7
5
2
3
8
Average
4.2
5.0
4.4
3.6
4.4
4.8
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
7.2
7
8
6
6
7
February
8.1
10
9
7
6
7
March
8.8
10
10
8
8
8
April
9.0
11
10
9
7
7
May
6.7
6
7
6
6
June
6.2
6
5
5
6
July
5.3
7
5
4
5
August
5.2
6
5
4
4
September
5.7
7
4
5
4
October
6.6
8
5
6
5
November
7.0
8
8
6
7
December
6.8
8
8
6
5
Average
7.1
9.6
7.5
6.2
5.7
5.8
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
244°
228°
326°
278°
173°
February
188°
197°
211°
017°
210°
March
177°
186°
196°
179°
160°
April
176°
191°
178°
183°
169°
May
170°
166°
135°
122°
June
164°
164°
169°
181°
July
190°
188°
172°
174°
August
185°
156°
168°
156°
September
148°
166°
175°
169°
October
191°
200°
203°
181°
November
184°
196°
184°
184°
December
205°
208°
189°
212°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.