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
93.6
87
90
96
90
97
February
92.7
91
92
97
85
91
March
94.4
94
98
94
97
95
April
96.0
96
100
92
97
May
94.6
96
95
89
97
June
95.7
93
96
88
99
July
98.2
97
100
95
100
August
96.4
100
94
92
100
September
94.7
98
98
99
98
October
89.8
90
92
98
92
November
92.0
93
93
95
92
December
95.5
92
98
99
98
Average
94.1
90.7
94.6
96.0
93.0
96.4
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
11.6
10
12
13
10
12
February
13.8
16
14
12
12
12
March
18.7
19
19
19
19
19
April
23.4
24
26
22
23
May
28.7
27
31
27
31
June
32.4
31
33
31
34
July
33.8
36
36
30
35
August
32.2
35
31
30
35
September
29.1
31
30
30
28
October
22.1
24
21
25
24
November
16.9
18
14
19
19
December
13.3
14
13
17
13
Average
22.3
14.8
23.7
23.5
22.7
23.8
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
-4.0
-5
-3
-6
-4
-2
February
-4.7
0
-2
-6
-6
-3
March
1.3
2
1
-1
1
4
April
4.6
4
6
4
4
May
11.2
12
12
11
11
June
15.7
15
17
14
16
July
18.2
19
20
16
19
August
17.3
19
18
15
18
September
13.7
15
14
14
11
October
6.8
8
8
7
5
November
1.2
2
0
2
3
December
-3.5
-2
-2
0
-4
Average
6.1
-2.8
7.2
6.9
6.2
6.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.2
12
6
3
5
4
February
5.5
8
4
7
11
4
March
4.0
7
1
3
5
3
April
1.5
1
0
3
2
May
2.3
5
1
3
2
June
1.8
2
1
7
0
July
1.3
0
0
2
1
August
2.1
1
7
3
1
September
1.1
0
1
2
1
October
5.4
3
12
0
5
November
2.8
4
6
0
3
December
3.1
6
4
0
2
Average
3.5
9.2
2.5
3.5
3.4
2.2
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
12.3
11
14
12
12
12
February
13.6
14
17
14
12
12
March
13.1
13
14
14
14
13
April
13.1
13
15
12
11
May
11.8
11
13
13
11
June
10.8
9
11
10
12
July
8.7
9
8
8
9
August
8.5
10
7
8
10
September
9.7
8
9
11
10
October
11.3
11
10
12
13
November
12.5
11
13
12
13
December
12.4
12
12
15
13
Average
11.5
12.8
11.4
11.3
11.3
11.5
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
267°
262°
284°
294°
271°
February
262°
251°
307°
250°
267°
March
252°
245°
283°
243°
230°
April
233°
239°
228°
253°
May
157°
233°
166°
229°
June
201°
180°
173°
192°
July
180°
177°
181°
179°
August
177°
136°
197°
182°
September
217°
202°
202°
313°
October
227°
213°
248°
252°
November
268°
253°
265°
243°
December
274°
245°
254°
315°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.