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
89.7
77
89
98
83
92
February
87.5
96
87
88
76
87
March
93.2
89
91
97
99
83
April
93.8
94
97
91
92
May
96.2
97
99
91
99
June
97.9
92
99
97
100
July
99.1
99
100
97
98
August
98.2
100
97
98
100
September
93.5
95
100
99
88
October
92.1
86
99
97
90
November
90.9
91
94
93
95
December
90.8
96
75
99
93
Average
93.1
86.9
93.1
95.9
93.8
93.2
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
15.0
13
17
16
14
17
February
16.7
21
18
15
11
16
March
22.1
22
22
23
22
22
April
26.0
26
30
24
25
May
30.2
29
35
27
32
June
33.9
34
37
33
34
July
36.0
38
40
33
36
August
36.0
40
36
35
37
September
32.1
35
33
34
29
October
26.1
27
26
28
26
November
20.1
20
18
21
23
December
17.1
18
17
24
17
Average
25.1
18.3
27.0
27.6
25.5
26.2
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
2.0
1
5
0
2
4
February
3.6
7
4
0
0
3
March
9.1
10
10
7
9
12
April
11.5
12
12
11
10
May
16.6
18
20
17
18
June
21.6
22
24
21
21
July
23.5
24
26
23
24
August
23.0
26
24
22
23
September
19.9
23
21
20
17
October
12.8
14
14
15
12
November
7.4
9
7
9
9
December
4.5
5
7
9
3
Average
12.1
5.8
14.2
13.7
13.2
13.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.4
6
6
1
6
2
February
4.7
1
8
12
4
4
March
1.4
2
2
1
1
4
April
2.2
1
1
3
2
May
1.5
2
1
2
1
June
0.9
2
1
1
0
July
0.9
0
1
1
2
August
2.5
2
2
2
1
September
4.5
3
3
0
7
October
4.5
7
3
1
3
November
3.3
6
6
2
2
December
3.1
3
2
1
4
Average
2.7
2.7
3.3
2.7
1.9
2.5
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
10.2
9
11
10
10
10
February
10.9
11
11
11
11
11
March
11.5
10
11
13
13
10
April
12.2
11
13
12
11
May
10.9
9
13
11
11
June
9.8
8
11
8
11
July
8.4
9
9
7
9
August
8.7
9
8
10
8
September
8.4
9
7
9
8
October
9.8
10
8
10
10
November
9.9
9
10
10
10
December
9.7
10
8
10
11
Average
10.1
10.0
9.7
10.1
10.0
10.0
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
256°
244°
285°
302°
227°
February
253°
240°
305°
327°
268°
March
202°
195°
241°
192°
204°
April
163°
191°
165°
196°
May
147°
182°
139°
168°
June
150°
166°
155°
160°
July
177°
172°
163°
169°
August
174°
156°
170°
174°
September
185°
179°
164°
040°
October
186°
182°
198°
179°
November
215°
205°
218°
198°
December
217°
204°
222°
275°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.