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
89.2
76
95
95
100
50
February
87.9
95
93
91
0
100
March
92.8
94
89
97
83
100
April
93.6
97
95
95
93
93
May
93.3
93
90
72
84
June
96.8
98
97
78
97
July
98.5
98
100
97
90
August
95.9
100
99
96
92
September
96.5
99
98
0
67
October
94.1
92
99
0
100
November
89.1
92
83
100
75
December
83.1
88
71
100
100
Average
91.5
90.7
94.5
93.9
85.7
90.3
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
9.4
8
14
12
4
6
February
11.4
20
15
13
0
6
March
16.8
20
17
19
13
14
April
19.8
24
23
25
14
15
May
24.4
27
27
19
21
June
28.7
31
32
25
26
July
31.8
36
38
26
28
August
30.9
36
35
27
27
September
27.2
32
31
25
21
October
20.1
23
25
18
15
November
13.6
18
15
10
12
December
10.0
14
12
11
5
Average
19.9
17.8
23.8
23.9
16.1
16.1
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
-1.2
-4
1
-4
1
2
February
0.8
5
2
-2
-4
1
March
6.5
8
5
4
8
9
April
9.9
11
9
11
10
9
May
16.0
16
17
15
17
June
20.6
20
21
21
21
July
22.8
23
24
22
24
August
22.1
23
23
23
21
September
19.2
20
18
19
16
October
11.2
12
10
13
10
November
5.1
6
4
6
8
December
2.3
3
4
5
1
Average
10.5
5.1
11.6
11.2
11.6
11.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.8
7
5
1
0
50
February
4.3
6
4
7
0
0
March
2.3
4
3
3
0
0
April
3.7
3
4
2
0
0
May
3.5
4
6
0
0
June
1.3
1
2
0
0
July
0.9
2
1
0
10
August
2.5
0
3
5
4
September
3.0
2
2
0
0
October
4.3
7
3
0
0
November
4.0
4
7
0
0
December
1.9
0
3
0
0
Average
2.8
4.8
2.8
3.1
0.6
3.7
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
10.4
10
11
11
7
5
February
11.3
12
11
12
6
10
March
11.9
12
12
13
9
6
April
12.6
13
12
15
9
6
May
10.2
8
12
8
7
June
9.4
8
10
6
8
July
8.7
9
10
6
6
August
8.1
9
9
7
6
September
9.1
10
9
0
5
October
10.4
11
9
0
12
November
10.5
10
11
18
9
December
9.8
10
10
8
5
Average
9.7
11.6
9.9
10.9
7.2
6.9
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
325°
223°
289°
360°
341°
February
206°
211°
276°
090°
306°
March
180°
284°
220°
152°
360°
April
164°
136°
145°
298°
165°
May
131°
144°
090°
095°
June
111°
140°
153°
168°
July
158°
154°
172°
141°
August
119°
138°
155°
136°
September
127°
146°
360°
180°
October
187°
183°
360°
349°
November
167°
158°
335°
165°
December
208°
188°
270°
225°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.