| Sand Martin |
| The first migrants often
appear in late March, with March 2000 being exceptional.
Most move through during April and continuing into May,
although this seems to have lessened in recent years as
passage has become more concentrated into April. Return
migration begins very early, often in late June, before a
second period of migration in September. |
| ... |
| Combined monthly
migration totals per year |
 |
| ... |
| Annual/monthly
migration totals (numerical) |
| ... |
| Year |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
|
Total |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 1998 |
|
|
|
48 |
19 |
|
9 |
27 |
24 |
|
|
|
|
127 |
| 1999 |
|
|
|
86 |
60 |
1 |
95 |
74 |
13 |
|
|
|
|
329 |
| 2000 |
|
|
64 |
144 |
34 |
|
90 |
40 |
19 |
|
|
|
|
391 |
| 2001 |
|
|
|
45 |
87 |
|
18 |
4 |
24 |
|
|
|
|
178 |
| 2002 |
|
|
10 |
30 |
19 |
39 |
168 |
21 |
40 |
|
|
|
|
227 |
| 2003 |
|
|
|
27 |
35 |
23 |
15 |
31 |
17 |
|
|
|
|
148 |
| 2004 |
|
|
5 |
121 |
3 |
|
103 |
4 |
3 |
|
|
|
|
239 |
| 2005 |
|
|
|
18 |
25 |
|
167 |
4 |
1 |
|
|
|
|
215 |
| 2006 |
|
|
|
45 |
2 |
7 |
9 |
1 |
5 |
|
|
|
|
69 |
| 2007 |
|
|
1 |
17 |
|
|
5 |
3 |
13 |
|
|
|
|
39 |
| 2008 |
|
|
5 |
127 |
8 |
|
16 |
|
14 |
|
|
|
|
170 |
| 2009 |
|
|
|
43 |
8 |
|
10 |
33 |
1 |
|
|
|
|
95 |
| 2010 |
|
|
2 |
60 |
1 |
|
27 |
16 |
3 |
|
|
|
|
109 |
|
