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Date

Temperature F. Precipitation
  24-hr Amounts At Obs.
24hrs ending at obsevation

Max Min
At Obsn. Rain, melted snow, etc. (Inches and Hndths) Snow, ice pellets (Inches and Tenths) Snow, ice pellets, main, ice on ground
1 48 27 39 0 0 3
2 39 23 30 0 0 3
3 36 23 29 .01 0.2 3
4 34 14 30 0 0 2
5 39 22 33 .88 1.8 4
6 44 30 35 .39 1.7 5
7 44 30 35 0 0 5
8 39 26 32 .02 0.7 5
9 44 31 45 .15 0.9 5
10 52 30 30 .02 0 2
11 30 17 20 0 0 2
12 31 10 24 0 0 2
13 45 20 31 .01 0.1 2
14 44 20 40 .03 0 2
15 42 34 34 T 0 1
16 41 21 33 .09 0.2 1
17 38 27 27 .11 0.1 1
18 30 12 22 0 0 T
19 41 13 34 0 0 T
20 57 35 45 0 0 T
21 45 25 25 0 0 T
22 25 12 22 0 0 T
23 38 19 32 .18 4.7 1
24 32 22 28 .39 0.6 2
25 40 23 40 .004 0 1
26 48 35 38 .09 0 .04
27 45 28 37 0 0 0
28 36 23 25 T T T
29            
30            
31            
Sum       2.37 10.9  
B-91 PUZZLE

To the left is a replication of that part of the B-91 form used by most CPOs in recording their monthly readings of temperature, liquid precipitation, and solid precipitation. The examples on this page are the February observations from a mythical Co-op Station. Their readings are taken at 7 AM each morning. There are at least 6 errors in the data. They are common errors made each month by observers - some are obvious, others are a little more subtle. Can you find them? Good luck!

ANSWERS

 

 

 

 

 

 

 

 

 

 

 

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