While our Davis anemometer performs excellently at lower speeds, it does not record with the accuracy of our Maximum Gust Maestro or our Don Kent Downeaster models at higher speeds.

After several years of testing and comparing of our three anemometers, the wind speeds recorded by our Davis anemometer and stored in our datalogger- and subsequently used in our summaries- are adjusted using the following charts. The adjustments are already made in our LCD (local climatological data) reports and in all data summaries published previously throughout our website.

HOWEVER, THE TEXT RAW DATA PRODUCTS PRODUCED BY VIRTUAL WEATHER STATION SOFTWARE AND UPDATED HOURLY AT OUR WEBSITE DO NOT INCLUDE THE ADJUSTMENTS.

Should you need a clarification of any speed, just email us and we'll check on it for you.

PWRS West Cradock in Portsmouth Wind Speed Adjustment Chart:


Value shown ....... Adjust by adding:

1-4 mph  .......... 3 miles per hour

5-34 mph .......... 5 miles per hour

35-49 mph ......... 10 miles per hour

50 mph and above .. 20 miles per hour

Depicted MPH ...... Adjusted Speed

00 ................  Calm
01 ................  4 mph
02 ................  5 mph
03 ................  6 mph
04 ................  7 mph
05 ................ 10 mph
06 ................ 11 mph
07 ................ 12 mph
08 ................ 13 mph
09 ................ 14 mph
10 ................ 15 mph
11 ................ 16 mph
12 ................ 17 mph
13 ................ 18 mph
14 ................ 19 mph
15 ................ 20 mph
16 ................ 21 mph
17 ................ 22 mph
18 ................ 23 mph
19 ................ 24 mph
21 ................ 25 mph
21 ................ 26 mph
22 ................ 27 mph
23 ................ 28 mph
24 ................ 29 mph
25 ................ 30 mph
26 ................ 31 mph
27 ................ 32 mph
28 ................ 33 mph
29 ................ 34 mph
30 ................ 35 mph
31 ................ 36 mph
32 ................ 37 mph
33 ................ 38 mph
34 ................ 39 mph
35 ................ 45 mph
36 ................ 46 mph
37 ................ 47 mph
38 ................ 48 mph
39 ................ 49 mph
40 ................ 50 mph
41 ................ 51 mph
42 ................ 52 mph
43 ................ 53 mph
44 ................ 54 mph
45 ................ 55 mph
46 ................ 56 mph
47 ................ 57 mph
48 ................ 58 mph
49 ................ 59 mph
50 ................ 70 mph

and so forth...