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
74.5
55
81
91
84
69
February
89.9
95
90
94
84
97
March
88.7
92
86
89
94
82
April
91.5
99
93
97
92
May
94.4
94
92
94
96
June
97.6
97
97
97
98
July
95.3
91
92
98
95
August
93.2
85
92
99
97
September
92.5
91
90
96
89
October
91.0
90
88
94
92
November
93.8
93
92
95
95
December
87.5
82
71
97
86
Average
90.0
80.0
89.9
90.8
94.4
91.0
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
3.5
1
5
4
5
4
February
7.1
15
9
7
-1
7
March
13.1
17
11
12
16
15
April
18.4
21
17
19
19
May
24.6
27
24
22
22
June
30.5
31
30
31
32
July
30.8
31
30
31
31
August
29.4
30
30
30
30
September
27.7
30
27
28
25
October
19.5
21
20
21
18
November
12.2
14
11
14
16
December
7.8
9
6
12
8
Average
17.7
10.7
19.9
18.4
19.0
18.7
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
-6.1
-8
-5
-9
-4
-4
February
-6.3
-2
-5
-8
-11
-5
March
1.3
3
0
-1
3
4
April
5.1
6
4
6
5
May
13.1
13
13
13
12
June
18.7
17
18
19
20
July
19.5
20
19
15
21
August
18.1
17
18
20
18
September
14.8
14
12
15
13
October
6.9
8
4
9
6
November
-1.6
0
-2
1
2
December
-4.6
1
-5
-2
-6
Average
5.8
-2.0
7.1
5.6
7.1
7.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.9
22
8
4
12
13
February
6.3
2
8
9
17
5
March
8.9
8
11
15
8
7
April
6.1
1
4
7
6
May
6.1
8
10
7
4
June
4.1
5
4
3
5
July
3.3
2
5
3
7
August
3.3
3
2
2
2
September
4.6
1
8
1
7
October
7.4
6
4
7
6
November
4.3
6
5
5
5
December
5.7
11
7
2
4
Average
6.3
10.9
5.6
6.4
5.8
5.6
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
8.6
8
8
9
9
9
February
9.7
9
10
11
9
9
March
10.6
11
11
11
12
9
April
11.0
12
13
11
10
May
8.8
8
10
9
9
June
7.9
7
8
6
9
July
6.2
6
6
6
6
August
6.2
6
6
7
6
September
7.3
6
7
8
8
October
8.6
9
8
8
9
November
9.0
8
10
9
10
December
8.5
9
8
9
8
Average
8.6
9.6
8.1
9.0
8.5
8.3
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
311°
303°
311°
323°
294°
February
244°
232°
305°
350°
332°
March
291°
319°
340°
162°
200°
April
241°
237°
260°
286°
May
143°
139°
158°
014°
June
115°
192°
180°
179°
July
304°
158°
168°
153°
August
147°
161°
171°
162°
September
167°
141°
188°
185°
October
279°
258°
349°
265°
November
204°
274°
244°
217°
December
260°
201°
216°
298°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.