Carnation
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Carnation clear sky chart from 2005-11-06 to 2024-02-20.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
39%
22515
9%
80186
9%
22418
40%
22418
12%
61362

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 10thNight
22%
777
4%
4486
6%
755
24%
755
4%
3959
January11th to 20thNight
30%
755
13%
4325
8%
740
32%
740
6%
3194
January21st to endNight
32%
835
5%
4816
10%
814
34%
814
5%
4087
February1st to 10thNight
26%
760
6%
2470
5%
760
28%
760
8%
2075
February11th to 20thNight
31%
738
8%
2396
8%
738
32%
738
10%
1953
February21st to endNight
29%
592
9%
1848
8%
592
31%
592
10%
1520
March1st to 10thNight
33%
720
8%
2136
7%
720
34%
720
13%
1690
March11th to 20thNight
31%
720
9%
1980
7%
720
33%
720
12%
1603
March21st to endNight
27%
792
4%
2093
2%
792
28%
792
9%
1794
April1st to 10thNight
30%
720
5%
1800
3%
720
31%
720
10%
1535
April11th to 20thNight
34%
707
9%
1775
5%
707
35%
707
15%
1438
April21st to endNight
35%
482
7%
1562
6%
482
36%
482
10%
1259
May1st to 10thNight
46%
360
9%
1440
13%
360
47%
360
14%
1003
May11th to 20thNight
48%
354
9%
1416
13%
354
50%
354
13%
1006
May21st to endNight
40%
388
4%
1552
7%
388
42%
388
10%
1186
June1st to 10thNight
45%
360
3%
1434
6%
360
45%
360
11%
1064
June11th to 20thNight
38%
360
3%
1260
4%
360
39%
360
9%
1008
June21st to endNight
56%
360
8%
1260
9%
360
57%
360
21%
832
July1st to 10thNight
63%
350
8%
1225
12%
350
63%
350
24%
760
July11th to 20thNight
68%
348
15%
1362
25%
348
69%
348
27%
741
July21st to endNight
75%
394
20%
1488
33%
372
76%
372
38%
697
August1st to 10thNight
74%
373
20%
1439
29%
371
75%
371
32%
741
August11th to 20thNight
75%
534
24%
1602
22%
534
76%
534
40%
892
August21st to endNight
63%
715
21%
1903
17%
715
64%
715
33%
1205
September1st to 10thNight
66%
720
19%
1800
12%
720
67%
720
37%
1152
September11th to 20thNight
55%
720
17%
1800
11%
720
56%
720
26%
1301
September21st to endNight
51%
720
16%
2047
15%
720
52%
720
23%
1442
October1st to 10thNight
50%
720
10%
2160
11%
720
50%
720
20%
1537
October11th to 20thNight
42%
720
12%
2160
13%
720
43%
720
15%
1618
October21st to endNight
34%
792
11%
2502
10%
792
37%
792
14%
1910
November1st to 10thNight
28%
740
6%
2529
6%
740
29%
740
9%
2060
November11th to 20thNight
27%
760
8%
2660
7%
760
30%
760
9%
2142
November21st to endNight
29%
760
6%
2660
6%
760
31%
760
9%
2153
December1st to 10thNight
31%
760
9%
2660
9%
760
32%
760
10%
2099
December11th to 20thNight
21%
760
7%
3225
5%
759
23%
759
6%
2666
December21st to endNight
18%
849
3%
4915
5%
835
21%
835
3%
4040

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
26%9%36%5%34446%29%
78583
Night
28%10%36%5%34445%28%
80500
TransparencyDay
59%6%12%15%6%1
78303
Night
61%6%12%14%7%1
80360
SeeingDay
29%9%19%26%14%3
13958
Night
34%6%13%26%18%2
22538

By Month

Percentage Cloud Cover NW (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
43%15%47%43333411%
2419
11th to 20thDay
28%12%48%6%33346%22%
2516
21st to endDay
45%11%46%5%2433413%
2835
February1st to 10thDay
34%11%47%6%35%445%16%
1710
11th to 20thDay
33%12%46%5%34345%20%
1657
21st to endDay
30%15%5%7%6%3434420%
1407
March1st to 10thDay
30%13%47%6%35%45%5%18%
1822
11th to 20thDay
32%13%46%6%35%44419%
1980
21st to endDay
30%14%48%7%45%5%46%14%
2263
April1st to 10thDay
28%13%48%7%46%45%6%16%
2160
11th to 20thDay
25%11%48%7%36%5%45%22%
2135
21st to endDay
25%10%49%7%45%5%5%6%20%
2398
May1st to 10thDay
22%9%47%7%445%45%29%
2520
11th to 20thDay
22%8%46%6%45%5%6%7%27%
2477
21st to endDay
29%9%36%7%44446%23%
2723
June1st to 10thDay
26%8%37%6%36%5%5%6%25%
2521
11th to 20thDay
29%9%47%6%36%5%5%6%20%
2700
21st to endDay
15%6%37%6%345%6%6%38%
2700
July1st to 10thDay
13%6%26%5%245%46%47%
2700
11th to 20thDay
12%5%35%5%3445%7%49%
2548
21st to endDay
11%413323345%60%
2741
August1st to 10thDay
13%5%24423447%52%
2490
11th to 20thDay
10%42343345%7%56%
2298
21st to endDay
16%6%26%434347%45%
2453
September1st to 10thDay
12%6%25%433447%49%
2160
11th to 20thDay
17%7%36%6%34447%39%
2160
21st to endDay
21%8%35%5%3445%5%39%
1912
October1st to 10thDay
21%9%45%5%35%6%6%6%31%
1800
11th to 20thDay
29%8%36%433448%27%
1800
21st to endDay
34%7%26%5%3445%6%24%
1854
November1st to 10thDay
41%9%35%5%345%4418%
1547
11th to 20thDay
38%10%36%5%3444422%
1520
21st to endDay
36%10%45%6%25%43421%
1520
December1st to 10thDay
33%9%36%5%35%445%23%
1520
11th to 20thDay
35%12%46%6%3444419%
1925
21st to endDay
31%12%48%8%4444416%
2692
January1st to 10thNight
44%13%36%6%3433411%
4494
11th to 20thNight
31%12%46%5%23447%23%
4382
21st to endNight
41%10%47%6%34435%14%
4819
February1st to 10thNight
36%10%5%7%5%34345%18%
2470
11th to 20thNight
31%13%46%5%34435%23%
2394
21st to endNight
32%14%36%5%24446%19%
1848
March1st to 10thNight
30%12%45%4335%47%23%
2136
11th to 20thNight
30%10%46%5%35%446%23%
1979
21st to endNight
31%12%47%5%345%5%5%17%
2093
April1st to 10thNight
28%11%38%6%35%6%5%7%18%
1800
11th to 20thNight
24%11%47%6%36%45%6%25%
1775
21st to endNight
29%9%46%6%4445%7%22%
1562
May1st to 10thNight
21%9%36%5%24446%34%
1440
11th to 20thNight
21%8%35%5%346%6%7%31%
1416
21st to endNight
24%9%47%7%35%45%6%27%
1552
June1st to 10thNight
23%8%37%6%35%5%45%30%
1434
11th to 20thNight
28%8%48%6%35%35%5%24%
1260
21st to endNight
13%6%36%6%35%45%6%44%
1260
July1st to 10thNight
13%5%346%33445%50%
1260
11th to 20thNight
10%5%25%424345%56%
1408
21st to endNight
9%423313336%63%
1576
August1st to 10thNight
9%413323448%57%
1447
11th to 20thNight
8%423322346%61%
1602
21st to endNight
15%5%25%423445%52%
1903
September1st to 10thNight
12%5%25%424346%53%
1800
11th to 20thNight
20%7%26%424445%42%
1800
21st to endNight
20%7%25%5%24445%41%
2047
October1st to 10thNight
22%7%36%6%34445%36%
2160
11th to 20thNight
28%8%26%5%335%5%431%
2160
21st to endNight
32%9%26%5%23446%28%
2502
November1st to 10thNight
36%10%35%5%34446%20%
2529
11th to 20thNight
36%9%46%6%3433423%
2660
21st to endNight
35%10%46%5%34435%22%
2660
December1st to 10thNight
32%10%45%5%33445%24%
2660
11th to 20thNight
33%13%48%6%33345%18%
3280
21st to endNight
31%13%48%7%45%44415%
4932

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
80%46%7%31
2419
11th to 20thDay
64%5%10%13%6%1
2540
21st to endDay
77%5%7%8%3
2835
February1st to 10thDay
72%7%9%8%31
1710
11th to 20thDay
70%5%9%8%6%1
1666
21st to endDay
71%410%10%5%
1407
March1st to 10thDay
69%5%12%12%2
1822
11th to 20thDay
72%49%11%31
1980
21st to endDay
76%6%10%7%1
2263
April1st to 10thDay
72%6%14%8%1
2160
11th to 20thDay
67%6%11%12%41
2135
21st to endDay
69%6%11%9%41
2398
May1st to 10thDay
59%6%16%14%5%
2520
11th to 20thDay
58%8%17%13%4
2480
21st to endDay
65%7%14%13%1
2724
June1st to 10thDay
62%7%16%10%4
2521
11th to 20thDay
68%6%15%9%2
2700
21st to endDay
47%8%18%18%8%1
2700
July1st to 10thDay
41%8%14%24%12%2
2626
11th to 20thDay
37%7%12%29%14%
2471
21st to endDay
27%5%13%35%17%3
2589
August1st to 10thDay
36%6%15%28%14%2
2473
11th to 20thDay
30%6%20%28%13%3
2298
21st to endDay
42%5%15%29%8%1
2453
September1st to 10thDay
36%7%15%25%12%5%
2160
11th to 20thDay
48%6%12%17%15%2
2160
21st to endDay
50%5%15%17%10%3
1912
October1st to 10thDay
53%7%12%21%6%1
1800
11th to 20thDay
57%6%13%18%6%1
1800
21st to endDay
64%5%10%12%10%
1854
November1st to 10thDay
70%5%12%10%4
1547
11th to 20thDay
70%5%9%8%7%2
1520
21st to endDay
70%5%5%11%7%2
1520
December1st to 10thDay
65%6%8%12%8%1
1520
11th to 20thDay
71%5%11%11%21
1928
21st to endDay
71%7%10%9%3
2692
January1st to 10thNight
79%5%6%6%31
4494
11th to 20thNight
63%410%15%6%1
4420
21st to endNight
75%5%8%8%41
4819
February1st to 10thNight
71%5%10%9%41
2470
11th to 20thNight
66%7%10%10%6%2
2396
21st to endNight
69%5%10%12%4
1848
March1st to 10thNight
63%5%15%12%5%
2136
11th to 20thNight
65%5%12%13%41
1980
21st to endNight
71%6%14%8%1
2093
April1st to 10thNight
67%8%12%11%2
1800
11th to 20thNight
62%6%13%11%7%1
1775
21st to endNight
65%7%11%11%5%1
1562
May1st to 10thNight
54%5%19%15%6%1
1440
11th to 20thNight
55%6%19%13%5%1
1416
21st to endNight
60%9%17%13%1
1552
June1st to 10thNight
60%5%16%14%5%
1434
11th to 20thNight
65%7%15%11%2
1260
21st to endNight
43%8%20%20%6%2
1260
July1st to 10thNight
39%7%16%21%13%3
1225
11th to 20thNight
36%315%29%15%1
1362
21st to endNight
23%5%14%33%20%4
1488
August1st to 10thNight
29%6%13%33%16%3
1439
11th to 20thNight
27%6%17%32%14%3
1602
21st to endNight
37%5%16%31%10%1
1903
September1st to 10thNight
34%6%15%27%14%4
1800
11th to 20thNight
47%6%11%18%15%3
1800
21st to endNight
47%7%14%18%11%2
2047
October1st to 10thNight
50%6%14%22%7%1
2160
11th to 20thNight
57%6%11%18%7%1
2160
21st to endNight
60%5%11%13%10%
2502
November1st to 10thNight
68%5%13%10%41
2529
11th to 20thNight
69%410%10%5%3
2660
21st to endNight
68%5%6%10%9%1
2660
December1st to 10thNight
66%5%9%11%8%1
2660
11th to 20thNight
71%6%9%11%31
3276
21st to endNight
72%6%11%7%3
4932

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
44%8%15%18%11%5%
180
11th to 20thDay
38%14%10%22%15%2
180
21st to endDay
51%8%13%13%12%3
226
February1st to 10thDay
43%11%19%18%9%1
370
11th to 20thDay
46%11%19%16%7%1
363
21st to endDay
38%11%20%23%8%1
314
March1st to 10thDay
40%13%19%19%8%1
420
11th to 20thDay
35%13%17%22%10%2
420
21st to endDay
42%11%24%14%8%1
462
April1st to 10thDay
38%10%23%18%10%2
420
11th to 20thDay
32%16%25%15%9%3
412
21st to endDay
31%11%26%22%9%1
420
May1st to 10thDay
24%10%27%27%11%2
423
11th to 20thDay
31%8%19%23%14%4
448
21st to endDay
30%8%21%26%11%3
485
June1st to 10thDay
28%9%22%26%13%3
451
11th to 20thDay
30%11%23%25%10%1
630
21st to endDay
17%5%22%36%18%3
630
July1st to 10thDay
16%5%19%38%20%2
621
11th to 20thDay
13%7%19%38%20%3
470
21st to endDay
10%318%40%23%5%
487
August1st to 10thDay
14%5%15%37%22%8%
447
11th to 20thDay
8%316%39%27%7%
437
21st to endDay
17%8%19%35%16%5%
495
September1st to 10thDay
16%8%24%35%15%2
450
11th to 20thDay
22%7%16%33%20%2
450
21st to endDay
24%6%20%27%18%3
450
October1st to 10thDay
26%9%20%22%20%3
450
11th to 20thDay
37%6%15%24%14%5%
450
21st to endDay
37%11%18%21%10%4
369
November1st to 10thDay
40%12%16%22%10%
210
11th to 20thDay
46%11%8%12%19%4
180
21st to endDay
41%8%13%17%13%8%
180
December1st to 10thDay
46%8%10%15%12%8%
180
11th to 20thDay
43%12%16%21%9%
180
21st to endDay
43%7%14%22%12%1
198
January1st to 10thNight
50%8%13%17%11%1
782
11th to 20thNight
42%9%14%22%12%2
760
21st to endNight
41%6%13%28%12%
836
February1st to 10thNight
42%7%17%25%9%1
760
11th to 20thNight
40%8%12%28%12%1
742
21st to endNight
40%8%15%26%9%1
592
March1st to 10thNight
38%8%15%25%13%1
720
11th to 20thNight
36%8%17%27%11%1
720
21st to endNight
41%8%16%25%8%2
792
April1st to 10thNight
36%8%15%26%13%2
720
11th to 20thNight
30%8%17%29%14%2
707
21st to endNight
35%7%15%29%13%2
482
May1st to 10thNight
26%8%12%33%20%1
360
11th to 20thNight
29%5%10%28%25%4
354
21st to endNight
30%5%14%24%25%4
389
June1st to 10thNight
29%411%31%22%2
360
11th to 20thNight
35%414%25%20%1
360
21st to endNight
18%313%31%32%4
360
July1st to 10thNight
16%5%8%29%37%5%
350
11th to 20thNight
13%28%34%38%5%
348
21st to endNight
9%48%26%47%6%
394
August1st to 10thNight
13%26%25%48%7%
373
11th to 20thNight
10%16%26%45%11%
534
21st to endNight
20%37%29%37%5%
715
September1st to 10thNight
16%38%37%31%5%
720
11th to 20thNight
23%38%26%33%6%
720
21st to endNight
25%411%29%27%3
720
October1st to 10thNight
27%5%10%30%25%3
720
11th to 20thNight
33%6%13%26%19%3
720
21st to endNight
38%8%15%25%12%2
792
November1st to 10thNight
42%8%16%27%7%
740
11th to 20thNight
43%7%16%24%9%1
760
21st to endNight
41%8%14%24%13%1
760
December1st to 10thNight
38%7%15%26%12%2
760
11th to 20thNight
46%8%17%23%5%1
760
21st to endNight
50%9%15%21%5%
856
Page generated at 2024-02-17 03:28:37. Version ac07

Copyright 2024 Attilla Danko


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