Swift |
An early return migrant,
with highest numbers recorded around mid-July. No large
movements have occurred after August 1st and much larger
movements can often occur ahead of thunderstorms or deep
areas of low pressure systems in June. Largest movement
was 1 270 north-west on July 30th 2005. |
... |
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 |
|
|
|
|
61 |
96 |
361 |
45 |
3 |
|
|
|
|
566 |
1999 |
|
|
|
|
90 |
|
758 |
111 |
2 |
|
|
|
|
961 |
2000 |
|
|
|
2 |
103 |
1 067 |
349 |
4 |
|
|
|
|
|
1 525 |
2001 |
|
|
|
8 |
167 |
|
42 |
34 |
2 |
|
|
|
|
253 |
2002 |
|
|
|
|
1 |
59 |
502 |
34 |
1 |
|
|
|
|
597 |
2003 |
|
|
|
7 |
65 |
15 |
953 |
22 |
|
|
|
|
|
1 057 |
2004 |
|
|
|
101 |
23 |
53 |
265 |
11 |
|
|
|
|
|
453 |
2005 |
|
|
|
14 |
185 |
|
2 201 |
18 |
|
|
|
|
|
2 418 |
2006 |
|
|
|
8 |
28 |
|
165 |
3 |
|
|
|
|
|
204 |
2007 |
|
|
|
9 |
18 |
|
76 |
2 |
|
|
|
|
|
105 |
2008 |
|
|
|
2 |
19 |
148 |
69 |
5 |
3 |
|
|
|
|
246 |
2009 |
|
|
|
|
69 |
|
101 |
286 |
|
|
|
|
|
456 |
2010 |
|
|
|
10 |
13 |
|
218 |
162 |
|
|
|
|
|
403 |
|