CLTD Correction factors for latitude and months
From ASHRAE (1989), with permission
Latitude |
Month |
N |
NE / NW |
E / W |
SE / SW |
S |
HOR |
0 |
Dec |
-3 |
-5 |
-2 |
3 |
9 |
-1 |
Jan/Nov |
-3 |
-4 |
-1 |
2 |
7 |
-1 |
|
Feb/Oct |
-3 |
-2 |
-1 |
0 |
0 |
0 |
|
Mar/Sep |
-3 |
1 |
-1 |
-3 |
-8 |
0 |
|
Apr/Aug |
5 |
3 |
-2 |
-6 |
-8 |
-2 |
|
May/Jul |
10 |
5 |
-3 |
-8 |
-8 |
-4 |
|
Jun |
12 |
5 |
-3 |
-9 |
-8 |
-5 |
|
8 |
Dec |
-4 |
-6 |
-3 |
4 |
12 |
-5 |
Jan/Nov |
-3 |
-6 |
-2 |
3 |
10 |
-4 |
|
Feb/Oct |
-3 |
-3 |
-1 |
1 |
4 |
-1 |
|
Mar/Sep |
-3 |
-1 |
-1 |
-2 |
-4 |
0 |
|
Apr/Aug |
2 |
2 |
-1 |
-5 |
-7 |
-1 |
|
May/Jul |
7 |
4 |
-2 |
-7 |
-7 |
-2 |
|
Jun |
9 |
4 |
-2 |
-8 |
-7 |
-2 |
|
16 |
Dec |
-4 |
-8 |
-4 |
4 |
13 |
-9 |
Jan/Nov |
-4 |
-7 |
-4 |
4 |
12 |
-7 |
|
Feb/Oct |
-3 |
-5 |
-2 |
2 |
7 |
-4 |
|
Mar/Sep |
-3 |
-2 |
-1 |
0 |
0 |
-1 |
|
Apr/Aug |
-1 |
-1 |
-1 |
-3 |
-6 |
0 |
|
May/Jul |
4 |
3 |
-1 |
-5 |
-7 |
0 |
|
Jun |
6 |
4 |
-1 |
-6 |
0 |
-7 |
|
Latitude |
Month |
N |
NE / NW |
E / W |
SE / SW |
S |
HOR |
24 |
Dec |
-5 |
-9 |
-7 |
3 |
13 |
-13 |
Jan/Nov |
-4 |
-8 |
-6 |
9 |
13 |
-11 |
|
Feb/Oct |
-4 |
-6 |
-3 |
3 |
10 |
-7 |
|
Mar/Sep |
-3 |
-3 |
-1 |
1 |
4 |
-3 |
|
Apr/Aug |
-2 |
0 |
-1 |
-1 |
-3 |
0 |
|
May/Jul |
1 |
2 |
0 |
-3 |
-6 |
1 |
|
Jun |
3 |
3 |
0 |
-4 |
-6 |
1 |
|
32 |
Dec |
-5 |
-10 |
-8 |
2 |
12 |
-17 |
Jan/Nov |
-5 |
-9 |
-8 |
-4 |
9 |
12 |
|
Feb/Oct |
-4 |
-7 |
-4 |
4 |
11 |
-10 |
|
Mar/Sep |
-3 |
-4 |
-2 |
3 |
7 |
-5 |
|
Apr/Aug |
-2 |
-1 |
0 |
0 |
1 |
-1 |
|
May/Jul |
1 |
1 |
0 |
-1 |
-3 |
1 |
|
Jun |
1 |
2 |
0 |
-2 |
-4 |
2 |
|
40 |
Dec |
-6 |
-10 |
-10 |
0 |
10 |
-21 |
Jan/Nov |
-5 |
-10 |
-9 |
1 |
11 |
-19 |
|
Feb/Oct |
-5 |
-8 |
-6 |
3 |
12 |
-14 |
|
Mar/Sep |
-4 |
-5 |
-3 |
4 |
10 |
-8 |
|
Apr/Aug |
-2 |
-2 |
0 |
2 |
4 |
-3 |
|
May/Jul |
0 |
0 |
0 |
0 |
1 |
1 |
|
Jun |
1 |
1 |
1 |
0 |
-1 |
2 |
|
Latitude |
Month |
N |
NE / NW |
E / W |
SE / SW |
S |
HOR |
48 |
Dec |
-6 |
-11 |
-13 |
-3 |
6 |
-25 |
Jan/Nov |
-6 |
-11 |
-11 |
-1 |
8 |
-24 |
|
Feb/Oct |
-5 |
-10 |
-8 |
1 |
11 |
-18 |
|
Mar/Sep |
-4 |
-6 |
-4 |
4 |
11 |
-11 |
|
Apr/Aug |
-3 |
-3 |
-1 |
4 |
7 |
-5 |
|
May/Jul |
0 |
0 |
1 |
3 |
4 |
0 |
|
Jun |
1 |
2 |
2 |
2 |
3 |
2 |
|
56 |
Dec |
-7 |
-12 |
-16 |
-9 |
-3 |
-28 |
Jan/Nov |
-6 |
-11 |
-14 |
-6 |
2 |
-27 |
|
Feb/Oct |
-6 |
-10 |
-10 |
0 |
9 |
-22 |
|
Mar/Sep |
-5 |
-7 |
-5 |
4 |
12 |
-15 |
|
Apr/Aug |
-3 |
-4 |
-1 |
5 |
9 |
-8 |
|
May/Jul |
0 |
0 |
2 |
5 |
7 |
-2 |
|
Jun |
2 |
2 |
3 |
4 |
6 |
1 |
|
64 |
Dec |
-7 |
-12 |
-17 |
-16 |
-12 |
-30 |
Jan/Nov |
-7 |
-12 |
-16 |
-13 |
-8 |
-29 |
|
Feb/Oct |
-6 |
-11 |
-13 |
-4 |
4 |
-26 |
|
Mar/Sep |
-5 |
-9 |
-7 |
-3 |
11 |
-20 |
|
Apr/Aug |
-3 |
-4 |
-1 |
5 |
11 |
-11 |
|
May/Jul |
1 |
1 |
3 |
6 |
10 |
-3 |
|
Jun |
2 |
2 |
4 |
6 |
9 |
0 |