Project Blue Book Special Report No. 14 (Analysis of Reports of Unidentified Aerial Objects)

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TABLE A11 EVALUATION OF UNIT SIGHTINGS BY MONTH OF YEAR, ALL YEARS

Evaluation | JANUARY | FEBRUARY | MARCH | APRIL
Number | Per Cent | Number | Per Cent | Number | Per Cent | Number | Per Cent
Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total
0-Balloon | 3 | 2 | 5 | 3.8 | 2.5 | 6.3 | 7 | 0 | 7 | 10.9 | 0.0 | 10.9 | 8 | 2 | 10 | 7.5 | 1.9 | 9.4 | 7 | 3 | 10 | 4.9 | 2.1 | 7.0
1-Astronomical | 21 | 18 | 39 | 26.2 | 22.5 | 48.7 | 11 | 15 | 26 | 17.2 | 23.5 | 40.7 | 15 | 12 | 27 | 14.0 | 11.2 | 25.2 | 26 | 3 | 29 | 18.3 | 2.1 | 20.4
2-Aircraft | 6 | 3 | 9 | 7.5 | 3.8 | 11.3 | 7 | 5 | 12 | 10.9 | 7.8 | 18.7 | 12 | 7 | 19 | 11.2 | 6.5 | 17.7 | 23 | 7 | 31 | 16.2 | 4.9 | 21.1
3-Light Phenom. | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 1 | 0 | 1 | 0.7 | 0.0 | 0.7
4-Birds | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 3 | 0 | 3 | 2.8 | 0.0 | 2.8 | 4 | 1 | 5 | 2.8 | 0.7 | 3.5
5-Clouds, Dust, etc. | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 0 | 1 | 1 | 0.0 | 0.9 | 0.9 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0
6-Insuffic. Info. | 8 | 0 | 8 | 10.0 | 0.0 | 10.0 | 3 | 0 | 3 | 4.7 | 0.0 | 4.7 | 15 | 0 | 15 | 14.0 | 0.0 | 14.0 | 21 | 0 | 21 | 14.8 | 0.0 | 14.8
7-Psychological | 2 | 0 | 2 | 2.5 | 0.0 | 2.5 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 2 | 0 | 8 | 0.0 | 0.0 | 0.0 | 2 | 0 | 2 | 1.4 | 0.0 | 1.4
8-Unknown | 11 | 0 | 11 | 13.8 | 0.0 | 13.8 | 9 | 0 | 9 | 14.1 | 0.0 | 14.1 | 17 | 0 | 17 | 15.9 | 0.0 | 15.9 | 42 | 0 | 42 | 29.6 | 0.0 | 29.6
9-Other | 5 | 1 | 6 | 6.2 | 1.3 | 7.5 | 7 | 0 | 7 | 10.9 | 0.0 | 10.9 | 1 | 14 | 15 | 0.9 | 13.1 | 14.0 | 2 | 0 | 2 | 1.4 | 0.0 | 1.4
Total | 56 | 24 | 80 | 70.0 | 30.0 | 100. | 44 | 20 | 64 | 68.8 | 31.3 | 100. | 71 | 36 | 107 | 66.4 | 33.6 | 100. | 128 | 14 | 142 | 90.1 | 9.9 | 100.

Evaluation | MAY | JUNE | JULY | AUGUST
Number | Per Cent | Number | Per Cent | Number | Per Cent | Number | Per Cent
Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total
0-Balloon | 18 | 5 | 23 | 12.0 | 3.3 | 15.3 | 29 | 6 | 35 | 14.4 | 3.0 | 17.4 | 92 | 48 | 140 | 11.9 | 6.2 | 18.1 | 39 | 42 | 81 | 5.7 | 9.4 | 18.1
1-Astronomical | 23 | 8 | 31 | 15.3 | 5.3 | 20.6 | 25 | 21 | 46 | 12.4 | 10.4 | 22.8 | 104 | 44 | 148 | 13.4 | 5.7 | 19.1 | 47 | 64 | 111 | 10.5 | 14.3 | 24.8
2-Aircraft | 18 | 15 | 33 | 12.0 | 10.0 | 22.0 | 30 | 13 | 43 | 14.9 | 6.5 | 21.4 | 106 | 81 | 187 | 13.7 | 10.5 | 24.2 | 48 | 38 | 86 | 10.7 | 8.5 | 19.2
3-Light Phenom. | 3 | 2 | 5 | 2.0 | 1.3 | 3.3 | 1 | 1 | 2 | 0.5 | 0.5 | 1.0 | 14 | 4 | 18 | 1.8 | 0.5 | 2.3 | 7 | 7 | 14 | 1.6 | 1.6 | 3.2
4-Birds | 0 | 2 | 2 | 0.0 | 1.3 | 1.3 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 3 | 3 | 6 | 0.4 | 0.4 | 0.8 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0
5-Clouds, Dust, etc. | 2 | 0 | 2 | 1.3 | 0.0 | 1.3 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 1 | 1 | 2 | 0.1 | 0.1 | 0.2 | 0 | 1 | 1 | 0.0 | 0.2 | 0.2
6-Insuffic. Info. | 22 | 0 | 22 | 14.7 | 0.0 | 14.7 | 23 | 0 | 23 | 11.4 | 0.0 | 11.4 | 81 | 0 | 81 | 10.5 | 0.0 | 10.5 | 42 | 0 | 42 | 9.4 | 0.0 | 9.4
7-Psychological | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 6 | 0 | 6 | 3.0 | 0.0 | 3.0 | 9 | 8 | 17 | 1.2 | 1.0 | 2.2 | 10 | 1 | 11 | 2.2 | 0.2 | 2.4
8-Unknown | 23 | 0 | 23 | 15.3 | 0.0 | 15.3 | 38 | 0 | 38 | 18.9 | 0.0 | 18.9 | 146 | 0 | 146 | 18.8 | 0.0 | 18.8 | 87 | 0 | 87 | 19.4 | 0.0 | 19.4
9-Other | 7 | 2 | 9 | 4.7 | 1.3 | 6.0 | 7 | 1 | 8 | 3.5 | 0.5 | 4.0 | 29 | 1 | 30 | 3.7 | 0.1 | 3.8 | 11 | 5 | 16 | 2.4 | 1.1 | 3.5
Total | 116 | 34 | 150 | 77.3 | 22.7 | 100. | 159 | 42 | 201 | 79.1 | 20.9 | 100 | 585 | 190 | 775 | 75.5 | 24.5 | 100. | 291 | 158 | 449 | 64.8 | 35.2 | 100.

Evaluation | SEPTEMBER | OCTOBER | NOVEMBER | DECEMBER
Number | Per Cent | Number | Per Cent | Number | Per Cent | Number | Per Cent
Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total
0-Balloon | 6 | 13 | 19 | 3.1 | 6.8 | 9.9 | 8 | 12 | 20 | 5.4 | 8.2 | 13.6 | 5 | 12 | 17 | 4.2 | 10.0 | 14.2 | 6 | 6 | 12 | 4.7 | 4.7 | 9.4
1-Astronomical | 30 | 11 | 41 | 15.6 | 5.7 | 21.3 | 27 | 19 | 46 | 18.4 | 12.9 | 31.3 | 25 | 19 | 43 | 20.8 | 15.0 | 35.8 | 29 | 23 | 52 | 22.8 | 18.1 | 40.9
2-Aircraft | 13 | 31 | 44 | 6.8 | 16.1 | 22.9 | 10 | 15 | 25 | 6.9 | 10.2 | 17.0 | 11 | 8 | 19 | 9.2 | 6.7 | 15.9 | 8 | 12 | 20 | 6.3 | 9.4 | 15.4
3-Light Phenom. | 1 | 2 | 3 | 0.5 | 1.0 | 1.5 | 1 | 4 | 5 | 0.7 | 2.7 | 3.4 | 3 | 1 | 4 | 2.5 | 0.8 | 3.3 | 1 | 0 | 1 | 0.8 | 0.0 | 0.8
4-Birds | 1 | 2 | 3 | 0.5 | 1.0 | 1.5 | 2 | 2 | 4 | 1.4 | 1.4 | 2.8 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0
5-Clouds, Dust, etc. | 0 | 1 | 1 | 0.0 | 0.6 | 0.5 | 0 | 1 | 1 | 0.0 | 0.7 | 0.7 | 0 | 2 | 2 | 0.0 | 1.7 | 1.7 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0
6-Insuffic. Info. | 20 | 0 | 20 | 10.4 | 0.0 | 10.4 | 10 | 0 | 10 | 6.8 | 0.0 | 6.8 | 7 | 0 | 7 | 5.8 | 0.0 | 5.8 | 9 | 0 | 9 | 7.1 | 0.0 | 7.1
7-Psychological | 3 | 0 | 3 | 1.6 | 0.0 | 1.6 | 1 | 0 | 1 | 0.7 | 0.0 | 0.7 | 1 | 0 | 1 | 0.8 | 0.0 | 0.8 | 2 | 0 | 2 | 1.6 | 0.0 | 1.6
8-Unknown | 47 | 0 | 47 | 24.7 | 0.0 | 24.7 | 31 | 0 | 31 | 21.1 | 0.0 | 21.1 | 23 | 0 | 23 | 19.2 | 0.0 | 19.2 | 23 | 0 | 23 | 18.1 | 0.0 | 18.1
9-Other | 8 | 3 | 11 | 14.2 | 1.6 | 5.8 | 3 | 1 | 4 | 2.0 | 0.7 | 2.7 | 4 | 0 | 4 | 3.3 | 0.0 | 3.3 | 8 | 0 | 8 | 6.3 | 0.0 | 6.3
Total | 129 | 63 | 192 | 67.2 | 32.8 | 100. | 93 | 54 | 147 | 63.3 | 36.7 | 100. | 79 | 41 | 120 | 65.8 | 34.2 | 100. | 86 | 41 | 127 | 67.7 | 32.3 | 100.

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