Wet Wind Chill Table
Air Temperature (F)
Rel. Hum.
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
Wind (mph)
100%
75
70
65
60
55
50
45
40
40
35
30
25
20
15
10
5
0
Calm
90%
73
68
63
58
53
48
43
38
36
31
25
19
13
7
1
-5
-11
5
80%
70
65
61
56
51
47
42
37
34
27
21
15
9
3
-4
-10
-16
10
70%
67
63
58
54
49
45
40
35
32
25
19
13
6
0
-7
-13
-19
15
60%
65
60
56
53
47
43
39
34
30
24
17
11
4
-2
-9
-15
-22
20
50%
62
57
54
49
45
41
37
32
29
23
16
9
3
-4
-11
-17
-24
25
40%
59
54
51
47
43
39
35
31
28
22
15
8
1
-5
-12
-19
-26
30
30%
55
51
48
44
41
37
33
29
28
21
14
7
0
-7
-14
-21
-27
35
20%
52
48
45
43
39
35
32
28
27
20
13
6
-1
-8
-15
-22
-29
40
10%
48
45
42
39
36
33
30
26
26
19
12
5
-2
-9
-16
-23
-30
45
0%
44
42
39
37
34
31
28
24
26
19
12
4
-3
-10
-17
-24
-31
50
Wet Bulb -5
Wind Chill
   
Shift left one square for part sun, two squares for full sun.
    
   
Water Temperature (F)
    
   
80
75
70
65
60
55
50
45
40
 35
32
    

Suggested Sailing Gear
Feels
Like
  
Clothing
70-80
 Shorts, t-shirt, boots and hat.
60-70
   Shorts and t-shirt with rain jacket and hat.
50-60
   Shorty wetsuit, boots and hat.
40-50
   Add rain gear, warm hat and gloves.
30-40
   Add fleece jacket and pants, wool socks and neoprene gloves.
20-30
   Drysuit with lots of warm layers, neoprene hood, booties and gloves.
10-20
   Survivial suit with lots of warm layers (or just stay home!).


How to use the Wet Wind Chill Table

  1. Get the predicted temperature, wind speed, and humidity from a weather report.
  2. If the temperature is less than 45 degrees, use the right hand table with temperature and wind speed to get the colored "feels like" wind chill temperature.. If the temperature is more than 45 degrees, use the left hand table with temperature and humidity to get the colored "feels like" temperature.
  3. If the weather is partly sunny, shift left one square. For full sun, shift left two squares.
  4. Check the Water Temperature table and note the level of insulation required to spend 30 minutes in the water.
  5. Use the color of the square you choose to enter the Suggested Sailing Gear table.
Wet Wind Chill Table by Geoff Farmer, March 2004. This information is experimental and intended only to suggest appropriate levels of insulation for dinghy sailing. Use with caution. This table is free to use with acknowledgement to the author. Wind Chill data provided by National Weather Service. Wet Bulb data interpolated from The American Practical Navigator.

For latest updates see www.byc.org/juniors/library/articles/wetwindchill.html. Send feedback to juniorsailing@byc.org.