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
85.5
91
92
75
85
90
February
87.8
96
93
86
85
89
March
92.8
94
94
89
97
91
April
94.3
94
94
95
98
May
90.6
92
93
92
96
June
91.6
86
92
95
94
July
91.5
94
91
81
91
August
89.4
96
86
93
97
September
89.0
93
95
92
69
October
87.2
82
89
92
84
November
87.1
91
89
81
92
December
82.6
76
90
85
84
Average
89.9
93.6
90.3
89.3
89.6
89.7
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
8.1
8
8
8
9
9
February
7.6
10
7
9
7
9
March
10.8
11
11
11
11
10
April
13.4
12
12
15
14
May
17.7
20
14
17
18
June
20.1
21
19
23
19
July
22.9
24
23
23
22
August
23.7
24
25
23
23
September
20.3
20
22
19
21
October
14.8
15
18
14
15
November
10.0
10
8
11
10
December
7.5
10
5
5
9
Average
14.1
9.5
15.2
14.8
14.7
14.8
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
1.4
1
2
2
3
3
February
0.5
3
0
1
1
1
March
1.5
3
1
3
2
1
April
4.0
4
3
4
4
May
7.5
9
7
7
8
June
9.7
9
10
12
10
July
10.7
10
12
11
11
August
11.3
12
12
12
11
September
9.4
10
10
9
10
October
5.0
6
6
6
7
November
2.8
3
0
5
3
December
1.5
4
0
0
2
Average
5.1
2.2
5.8
5.5
5.8
5.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.5
19
10
0
7
5
February
7.7
13
16
2
4
4
March
5.4
13
12
3
3
3
April
5.3
17
5
2
4
May
3.2
5
4
1
4
June
3.5
7
3
3
4
July
0.4
2
0
0
1
August
0.9
3
1
0
1
September
2.8
7
1
4
2
October
4.9
11
10
5
1
November
6.1
5
12
9
5
December
6.2
9
12
10
3
Average
5.3
15.0
8.5
3.8
3.4
2.9
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
4.9
5
5
4
5
6
February
4.6
5
4
4
5
4
March
5.2
6
6
5
6
5
April
5.7
6
7
5
5
May
4.6
4
5
5
5
June
4.6
5
5
5
4
July
4.0
4
4
4
4
August
4.3
4
4
4
5
September
4.6
5
5
5
4
October
4.6
5
4
5
5
November
4.7
4
4
6
5
December
3.9
4
4
4
4
Average
4.7
5.4
4.7
4.6
4.9
4.6
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
140°
129°
161°
140°
142°
February
147°
148°
133°
137°
154°
March
145°
141°
192°
147°
282°
April
138°
141°
295°
321°
May
311°
332°
305°
234°
June
321°
292°
280°
293°
July
309°
301°
305°
298°
August
317°
310°
333°
289°
September
345°
314°
205°
250°
October
146°
212°
151°
241°
November
134°
260°
145°
171°
December
133°
148°
196°
137°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.