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
87.4
86
80
92
84
85
February
82.7
92
85
83
84
86
March
90.0
85
92
92
88
87
April
92.8
96
90
94
92
87
May
96.8
95
98
95
97
June
97.4
95
97
99
97
July
98.0
96
98
99
99
August
96.4
95
95
100
99
September
90.5
96
95
98
95
October
91.6
89
96
94
92
November
84.6
82
84
65
91
December
87.2
85
79
87
90
Average
91.4
89.6
90.6
92.4
90.8
92.2
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
18.7
17
19
19
19
20
February
20.7
22
22
18
17
21
March
23.9
24
24
23
24
26
April
26.3
27
25
28
26
27
May
29.7
29
32
28
30
June
32.4
33
34
32
32
July
33.3
35
35
32
33
August
33.5
37
33
33
34
September
30.1
35
32
31
31
October
27.9
27
28
29
28
November
22.6
21
21
23
25
December
20.7
20
22
25
20
Average
26.2
22.1
27.3
27.2
26.5
27.0
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
8.4
7
10
7
9
11
February
10.6
12
8
6
7
10
March
14.5
14
15
11
13
18
April
16.7
17
16
19
16
17
May
21.2
21
23
21
20
June
23.4
24
24
24
23
July
24.2
24
25
24
24
August
24.1
25
25
25
24
September
19.7
23
15
20
23
October
17.0
17
15
18
16
November
12.4
12
13
12
14
December
10.4
10
14
16
8
Average
16.4
12.4
17.1
16.4
17.1
17.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.2
6
6
6
5
10
February
5.1
7
1
8
1
2
March
4.8
5
5
6
7
4
April
4.0
2
6
2
5
3
May
3.9
3
2
10
5
June
4.4
1
3
5
3
July
4.5
4
3
10
7
August
5.3
4
11
4
1
September
7.7
3
4
7
7
October
6.6
7
3
4
4
November
8.6
14
19
4
5
December
6.3
4
7
1
11
Average
5.5
4.8
4.7
6.0
5.4
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
8.8
9
9
9
9
8
February
9.5
9
9
9
10
9
March
10.0
8
11
10
10
11
April
10.0
10
9
11
10
9
May
9.0
6
11
9
9
June
8.1
9
7
8
9
July
6.8
7
8
6
8
August
6.8
8
7
6
7
September
6.2
7
6
6
8
October
7.6
8
7
7
7
November
7.9
7
9
7
8
December
8.1
7
9
10
8
Average
8.3
9.0
8.1
8.6
8.0
8.4
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
032°
144°
020°
086°
094°
February
186°
176°
022°
112°
131°
March
136°
151°
158°
118°
157°
April
151°
120°
150°
122°
105°
May
136°
165°
134°
158°
June
187°
166°
162°
148°
July
184°
182°
168°
166°
August
167°
169°
161°
169°
September
151°
084°
086°
078°
October
090°
115°
120°
073°
November
056°
076°
106°
080°
December
070°
139°
177°
148°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.