This table presents the number of icebergs that passed south of 48° N latitude each month since 1900. It reflects the current definition of the ice year, which extends from October through the following September. The yearly total is simply the summation of the monthly values. For each line, the year is based on the year of the January that appears in the line.
The origin of this iceberg count table can be traced to the 1926 IIP Annual Report in which monthly iceberg counts were presented for 1900 through 1926. The early part of the iceberg history was reconstructed with data gleaned from mariner’s reports to the United States Hydrographic Office. The latter part came from IIP’s records. In all the years that followed, Ice Patrol has presented monthly iceberg counts in its annual reports.
At the time of the 1926 reconstruction, the ice year was the same as the calendar year. IIP maintained this convention until 1967 when its definition was changed to September to August. There were two reasons for this change. First, it recognized the seasonal nature of IIP’s operations. Icebergs usually stopped arriving on the Grand Bank in late summer and didn’t resume until winter, possibly as early as November or December. Thus, the late summer is a natural break in the movement of icebergs onto the Grand Banks. Second, and perhaps on a more pragmatic level, IIP did not have wait until the end of the calendar year to prepare its annual report.
The second change followed the 1982 iceberg season, when the ice year was redefined as October through September. This small change was undertaken for two reasons. First, it reduced the likelihood that an ice season would carry over into the following ice year. Second, it fell into line with the U. S. Government's fiscal year. The first reason probably carried more weight; since the 1982 season ended very late (1 September 1982), and IIP was concerned about the carry-over issue.
Each time IIP changed the definition of the ice year they recomputed the yearly totals, so the new values would be internally consistent. These computations caused some small inconsistencies with the original yearly totals presented in the various IIP annual reports. For example, in 1940 and 1941 the ice year was the calendar year. In both years it was reported in IIP’s annual reports that two icebergs passed south of 48° N during the year. One of these icebergs passed south of 48° N in November 1940 and was originally counted as a 1940 observation. It is now counted as a 1941 observation. Thus, in 1940 there is one iceberg listed, and in 1941, three.
| YEAR | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | TOTAL |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1900 | 000 | 000 | 000 | 010 | 000 | 000 | 005 | 032 | 033 | 006 | 001 | 001 | 088 |
| 1901 | 001 | 000 | 000 | 001 | 000 | 000 | 004 | 013 | 029 | 022 | 006 | 005 | 081 |
| 1902 | 001 | 002 | 005 | 003 | 000 | 001 | 001 | 013 | 005 | 016 | 001 | 000 | 048 |
| 1903 | 001 | 000 | 000 | 000 | 002 | 400 | 166 | 151 | 052 | 023 | 007 | 000 | 802 |
| 1904 | 000 | 000 | 001 | 000 | 000 | 012 | 063 | 082 | 089 | 014 | 003 | 002 | 266 |
| 1905 | 000 | 000 | 000 | 003 | 002 | 168 | 373 | 109 | 100 | 050 | 009 | 008 | 822 |
| 1906 | 008 | 000 | 015 | 014 | 011 | 077 | 049 | 133 | 087 | 018 | 016 | 000 | 428 |
| 1907 | 000 | 000 | 000 | 000 | 001 | 011 | 162 | 248 | 138 | 064 | 011 | 000 | 635 |
| 1908 | 000 | 000 | 003 | 001 | 000 | 007 | 039 | 082 | 051 | 002 | 002 | 020 | 207 |
| 1909 | 015 | 003 | 000 | 000 | 055 | 147 | 134 | 321 | 181 | 121 | 045 | 019 | 1,041 |
| 1910 | 001 | 000 | 000 | 000 | 000 | 000 | 034 | 010 | 003 | 003 | 000 | 000 | 051 |
| 1911 | 000 | 000 | 000 | 000 | 008 | 041 | 112 | 072 | 077 | 021 | 040 | 003 | 374 |
| 1912 | 000 | 008 | 014 | 001 | 000 | 034 | 395 | 345 | 159 | 063 | 019 | 000 | 1,038 |
| 1913 | 000 | 003 | 000 | 002 | 004 | 037 | 109 | 292 | 071 | 014 | 004 | 007 | 543 |
| 1914 | 000 | 006 | 004 | 001 | 041 | 032 | 027 | 419 | 071 | 022 | 046 | 052 | 721 |
| 1915 | 013 | 001 | 006 | 014 | 072 | 067 | 096 | 097 | 071 | 028 | 017 | 005 | 487 |
| 1916 | 000 | 001 | 000 | 000 | 000 | 000 | 000 | 025 | 029 | 000 | 000 | 000 | 055 |
| 1917 | 000 | 000 | 000 | 000 | 000 | 013 | 003 | 003 | 009 | 010 | 000 | 000 | 038 |
| 1918 | 000 | 000 | 000 | 000 | 000 | 012 | 023 | 026 | 037 | 027 | 034 | 022 | 181 |
| 1919 | 001 | 014 | 003 | 003 | 004 | 005 | 025 | 075 | 056 | 026 | 036 | 069 | 317 |
| 1920 | 002 | 012 | 004 | 006 | 043 | 020 | 005 | 211 | 086 | 018 | 005 | 018 | 430 |
| 1921 | 019 | 010 | 004 | 017 | 005 | 043 | 210 | 198 | 175 | 053 | 024 | 004 | 762 |
| 1922 | 010 | 001 | 006 | 000 | 003 | 035 | 071 | 245 | 083 | 021 | 011 | 006 | 492 |
| 1923 | 027 | 021 | 000 | 000 | 003 | 028 | 065 | 083 | 042 | 010 | 003 | 002 | 284 |
| 1924 | 000 | 000 | 000 | 003 | 000 | 006 | 002 | 000 | 000 | 000 | 000 | 000 | 011 |
| 1925 | 000 | 000 | 000 | 000 | 003 | 005 | 008 | 058 | 022 | 013 | 000 | 000 | 109 |
| 1926 | 000 | 000 | 000 | 000 | 003 | 015 | 058 | 168 | 085 | 004 | 006 | 002 | 341 |
| 1927 | 003 | 001 | 000 | 004 | 010 | 026 | 093 | 153 | 095 | 005 | 003 | 000 | 393 |
| 1928 | 000 | 000 | 000 | 000 | 000 | 014 | 156 | 190 | 087 | 055 | 005 | 000 | 507 |
| 1929 | 004 | 004 | 000 | 000 | 000 | 045 | 332 | 460 | 376 | 107 | 001 | 000 | 1,329 |
| 1930 | 000 | 018 | 012 | 014 | 116 | 087 | 089 | 101 | 062 | 003 | 001 | 001 | 504 |
| 1931 | 001 | 000 | 000 | 000 | 000 | 002 | 001 | 010 | 000 | 000 | 000 | 000 | 014 |
| 1932 | 000 | 000 | 000 | 000 | 001 | 043 | 321 | 090 | 058 | 001 | 000 | 000 | 514 |
| 1933 | 000 | 000 | 000 | 000 | 002 | 004 | 012 | 162 | 036 | 000 | 000 | 000 | 216 |
| 1934 | 000 | 000 | 000 | 001 | 000 | 000 | 245 | 228 | 087 | 014 | 001 | 000 | 576 |
| 1935 | 000 | 000 | 000 | 000 | 000 | 046 | 177 | 501 | 134 | 011 | 003 | 000 | 872 |
| 1936 | 000 | 000 | 003 | 000 | 000 | 000 | 008 | 014 | 000 | 000 | 000 | 000 | 025 |
| 1937 | 000 | 000 | 000 | 020 | 053 | 121 | 124 | 137 | 014 | 001 | 000 | 000 | 470 |
| 1938 | 000 | 000 | 000 | 002 | 003 | 038 | 212 | 286 | 110 | 013 | 000 | 000 | 664 |
| 1939 | 000 | 000 | 000 | 000 | 000 | 022 | 173 | 471 | 150 | 028 | 006 | 000 | 850 |
| 1940 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 001 | 000 | 000 | 000 | 000 | 001 |
| 1941 | 000 | 001 | 000 | 000 | 000 | 000 | 001 | 001 | 000 | 000 | 000 | 000 | 003 |
| 1942 | 000 | 000 | 000 | 000 | 000 | 030 | 000 | 000 | 000 | 000 | 000 | 000 | 030 |
| 1943 | 000 | 000 | 000 | 000 | 000 | 025 | 090 | 298 | 270 | 150 | 007 | 000 | 840 |
| 1944 | 000 | 000 | 000 | 000 | 000 | 031 | 319 | 213 | 106 | 030 | 001 | 000 | 700 |
| 1945 | 000 | 000 | 000 | 000 | 006 | 352 | 253 | 256 | 092 | 109 | 015 | 000 | 1,083 |
| 1946 | 000 | 000 | 000 | 000 | 002 | 067 | 098 | 168 | 088 | 007 | 000 | 000 | 430 |
| 1947 | 000 | 000 | 000 | 003 | 001 | 002 | 005 | 011 | 026 | 015 | 000 | 000 | 063 |
| 1948 | 000 | 000 | 000 | 000 | 000 | 060 | 210 | 185 | 068 | 000 | 000 | 000 | 523 |
| 1949 | 000 | 000 | 000 | 000 | 000 | 001 | 023 | 020 | 003 | 000 | 000 | 000 | 047 |
| 1950 | 000 | 000 | 000 | 000 | 012 | 061 | 183 | 135 | 058 | 007 | 000 | 001 | 457 |
| 1951 | 001 | 002 | 000 | 000 | 003 | 002 | 000 | 000 | 000 | 000 | 000 | 000 | 008 |
| 1952 | 000 | 000 | 001 | 000 | 000 | 000 | 012 | 002 | 000 | 000 | 000 | 000 | 015 |
| 1953 | 000 | 000 | 000 | 000 | 000 | 021 | 011 | 018 | 006 | 000 | 000 | 000 | 056 |
| 1954 | 000 | 000 | 000 | 001 | 016 | 047 | 165 | 065 | 016 | 002 | 000 | 000 | 312 |
| 1955 | 000 | 000 | 000 | 000 | 000 | 010 | 032 | 014 | 005 | 000 | 000 | 000 | 061 |
| 1956 | 000 | 000 | 000 | 000 | 000 | 009 | 013 | 034 | 021 | 003 | 000 | 000 | 080 |
| 1957 | 000 | 000 | 000 | 003 | 043 | 041 | 172 | 265 | 288 | 113 | 006 | 000 | 931 |
| 1958 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 001 | 000 | 000 | 001 |
| 1959 | 000 | 000 | 000 | 000 | 000 | 014 | 266 | 180 | 186 | 043 | 000 | 000 | 689 |
| 1960 | 000 | 002 | 003 | 003 | 000 | 000 | 041 | 161 | 044 | 004 | 000 | 000 | 258 |
| 1961 | 000 | 000 | 000 | 000 | 006 | 060 | 030 | 016 | 001 | 000 | 001 | 000 | 114 |
| 1962 | 001 | 000 | 001 | 000 | 000 | 014 | 070 | 021 | 010 | 003 | 000 | 001 | 121 |
| 1963 | 000 | 000 | 000 | 000 | 000 | 004 | 020 | 000 | 001 | 000 | 000 | 000 | 025 |
| 1964 | 000 | 000 | 000 | 000 | 003 | 088 | 225 | 019 | 028 | 005 | 001 | 000 | 369 |
| 1965 | 000 | 000 | 000 | 000 | 001 | 019 | 033 | 022 | 001 | 000 | 000 | 000 | 076 |
| 1966 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 000 |
| 1967 | 000 | 000 | 000 | 000 | 000 | 025 | 134 | 209 | 065 | 008 | 000 | 000 | 441 |
| 1968 | 000 | 000 | 000 | 000 | 000 | 000 | 104 | 044 | 060 | 014 | 004 | 004 | 230 |
| 1969 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 035 | 017 | 001 | 000 | 000 | 053 |
| 1970 | 000 | 000 | 000 | 000 | 000 | 000 | 005 | 002 | 070 | 008 | 000 | 000 | 085 |
| 1971 | 000 | 000 | 000 | 000 | 000 | 031 | 004 | 020 | 007 | 011 | 000 | 000 | 073 |
| 1972 | 000 | 000 | 000 | 000 | 040 | 185 | 501 | 559 | 225 | 048 | 026 | 004 | 1,588 |
| 1973 | 000 | 000 | 006 | 054 | 110 | 134 | 212 | 159 | 151 | 019 | 001 | 000 | 846 |
| 1974 | 000 | 000 | 000 | 000 | 001 | 099 | 345 | 446 | 266 | 168 | 061 | 001 | 1,387 |
| 1975 | 000 | 000 | 000 | 000 | 024 | 041 | 010 | 020 | 005 | 000 | 000 | 000 | 100 |
| 1976 | 000 | 000 | 000 | 000 | 000 | 033 | 013 | 067 | 035 | 003 | 000 | 000 | 151 |
| 1977 | 000 | 000 | 000 | 000 | 003 | 007 | 012 | 000 | 000 | 000 | 000 | 000 | 022 |
| 1978 | 000 | 000 | 000 | 000 | 000 | 005 | 028 | 035 | 007 | 000 | 000 | 000 | 075 |
| 1979 | 000 | 000 | 000 | 000 | 005 | 020 | 081 | 034 | 009 | 003 | 000 | 000 | 152 |
| 1980 | 000 | 000 | 000 | 001 | 003 | 007 | 000 | 009 | 004 | 000 | 000 | 000 | 024 |
| 1981 | 000 | 000 | 000 | 000 | 000 | 048 | 010 | 005 | 000 | 000 | 000 | 000 | 063 |
| 1982 | 000 | 000 | 000 | 000 | 000 | 017 | 061 | 013 | 094 | 003 | 000 | 000 | 188 |
| 1983 | 000 | 000 | 002 | 009 | 165 | 124 | 339 | 465 | 168 | 076 | 004 | 000 | 1,352 |
| 1984 | 000 | 000 | 000 | 000 | 000 | 101 | 953 | 484 | 227 | 335 | 093 | 009 | 2,202 |
| 1985 | 003 | 011 | 007 | 002 | 057 | 129 | 208 | 205 | 247 | 123 | 039 | 032 | 1,063 |
| 1986 | 000 | 000 | 000 | 000 | 003 | 040 | 060 | 059 | 024 | 018 | 000 | 000 | 204 |
| 1987 | 000 | 000 | 005 | 002 | 014 | 048 | 076 | 029 | 127 | 015 | 002 | 000 | 318 |
| 1988 | 000 | 000 | 000 | 000 | 000 | 008 | 095 | 033 | 020 | 019 | 010 | 002 | 187 |
| 1989 | 003 | 000 | 000 | 000 | 019 | 127 | 068 | 039 | 035 | 010 | 000 | 000 | 301 |
| 1990 | 000 | 000 | 000 | 000 | 009 | 112 | 376 | 187 | 076 | 026 | 007 | 000 | 793 |
| 1991 | 000 | 000 | 000 | 000 | 020 | 115 | 144 | 269 | 1030 | 325 | 071 | 000 | 1,974 |
| 1992 | 000 | 000 | 000 | 000 | 069 | 053 | 099 | 230 | 103 | 171 | 132 | 019 | 876 |
| 1993 | 000 | 000 | 016 | 112 | 336 | 276 | 428 | 338 | 188 | 050 | 008 | 001 | 1,753 |
| 1994 | 000 | 000 | 000 | 000 | 079 | 529 | 208 | 377 | 387 | 161 | 024 | 000 | 1,765 |
| 1995 | 000 | 000 | 000 | 000 | 043 | 385 | 334 | 405 | 218 | 041 | 006 | 000 | 1,432 |
| 1996 | 000 | 000 | 000 | 000 | 000 | 004 | 297 | 187 | 108 | 014 | 001 | 000 | 611 |
| 1997 | 000 | 000 | 000 | 000 | 010 | 475 | 162 | 238 | 080 | 043 | 003 | 000 | 1,011 |
| 1998 | 000 | 000 | 000 | 000 | 005 | 026 | 070 | 1017 | 247 | 015 | 000 | 000 | 1,380 |
| 1999 | 000 | 000 | 000 | 000 | 000 | 001 | 002 | 011 | 005 | 003 | 000 | 000 | 022 |
| 2000 | 000 | 000 | 000 | 000 | 000 | 286 | 239 | 212 | 065 | 041 | 000 | 000 | 843 |
| 2001 | 000 | 000 | 000 | 000 | 004 | 031 | 031 | 019 | 004 | 000 | 000 | 000 | 089 |
| 2002 | 000 | 000 | 000 | 000 | 016 | 173 | 316 | 308 | 064 | 000 | 000 | 000 | 877 |
| 2003 | 000 | 000 | 000 | 000 | 000 | 084 | 263 | 494 | 076 | 010 | 000 | 000 | 927 |
| 2004 | 000 | 000 | 000 | 000 | 000 | 000 | 024 | 114 | 117 | 007 | 000 | 000 | 262 |
| 2005 | 000 | 000 | 000 | 000 | 000 | 009 | 001 | 001 | 000 | 000 | 000 | 000 | 011 |
| 2006 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 000 |
| 2007 | 000 | 000 | 000 | 000 | 000 | 004 | 040 | 071 | 183 | 026 | 000 | 000 | 324 | include & update totals & mean when data is available
| 2008 | 000 | 000 | 000 | 000 | 000 | 045 | 712 | 173 | 043 | 003 | 000 | 000 | 976 |
| 2009 | 000 | 000 | 000 | 000 | 000 | 286 | 266 | 450 | 180 | 021 | 001 | 000 | 1204 |
| TOTAL | 115 | 121 | 121 | 310 | 1,573 | 6,745 | 13,785 | 16,491 | 9,405 | 3,238 | 890 | 320 | 53,114 |
| MEAN | 001 | 001 | 001 | 003 | 014 | 061 | 125 | 150 | 086 | 029 | 008 | 003 | 483 |
| YEAR | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | TOTAL |