Dievseta
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dievseta clear sky chart from 2005-11-06 to 2024-02-05.

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
34%
24877
15%
80274
9%
24778
40%
24778
20%
55209

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
24%
940
11%
4382
5%
926
30%
926
10%
3214
January11th to 20thNight
20%
948
10%
4363
4%
930
26%
930
8%
3329
January21st to endNight
20%
1034
6%
4657
1%
1023
26%
1023
8%
3620
February1st to 10thNight
22%
923
13%
2399
4%
923
28%
923
18%
1780
February11th to 20thNight
23%
843
17%
2238
5%
839
32%
839
20%
1584
February21st to endNight
21%
592
16%
1776
4%
592
32%
592
17%
1256
March1st to 10thNight
27%
720
14%
2160
8%
720
33%
720
19%
1513
March11th to 20thNight
31%
559
19%
1999
11%
559
42%
559
18%
1308
March21st to endNight
32%
594
17%
2057
13%
594
40%
594
17%
1422
April1st to 10thNight
23%
540
14%
1800
8%
540
32%
540
17%
1249
April11th to 20thNight
30%
533
18%
1775
13%
533
41%
533
19%
1202
April21st to endNight
31%
540
16%
1762
9%
540
40%
540
20%
1187
May1st to 10thNight
29%
540
14%
1440
7%
540
33%
540
22%
1036
May11th to 20thNight
38%
531
18%
1417
9%
531
44%
531
26%
968
May21st to endNight
46%
584
15%
1552
6%
582
51%
582
30%
1009
June1st to 10thNight
45%
540
15%
1440
6%
540
51%
540
33%
905
June11th to 20thNight
44%
540
16%
1440
8%
540
47%
540
31%
944
June21st to endNight
54%
540
18%
1440
10%
540
58%
540
36%
888
July1st to 10thNight
65%
525
18%
1400
10%
525
68%
525
46%
792
July11th to 20thNight
56%
522
20%
1392
11%
522
60%
522
39%
840
July21st to endNight
69%
591
22%
1487
15%
558
70%
558
46%
849
August1st to 10thNight
64%
537
22%
1491
17%
534
67%
534
38%
885
August11th to 20thNight
62%
534
21%
1642
21%
534
65%
534
33%
964
August21st to endNight
57%
594
22%
1980
21%
594
62%
594
34%
1083
September1st to 10thNight
53%
540
22%
1800
23%
540
58%
540
31%
1041
September11th to 20thNight
52%
540
28%
1800
24%
540
60%
540
34%
1000
September21st to endNight
42%
710
23%
2010
13%
710
50%
710
31%
1247
October1st to 10thNight
42%
720
21%
2160
13%
720
48%
720
30%
1308
October11th to 20thNight
30%
720
19%
2160
9%
720
38%
720
22%
1435
October21st to endNight
30%
792
15%
2506
9%
792
37%
792
18%
1734
November1st to 10thNight
31%
740
22%
2406
13%
740
42%
740
23%
1544
November11th to 20thNight
21%
883
14%
2593
6%
883
29%
883
16%
1882
November21st to endNight
24%
950
16%
2660
6%
950
32%
950
20%
1895
December1st to 10thNight
21%
950
10%
2660
3%
950
27%
950
16%
1995
December11th to 20thNight
16%
949
11%
3214
3%
948
23%
948
10%
2484
December21st to endNight
15%
1039
6%
4816
3%
1026
21%
1026
6%
3817

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
13%9%47%6%35%5%5%7%35%
78152
Night
13%10%48%6%3445%6%36%
80749
TransparencyDay
47%7%13%22%10%1
77852
Night
48%6%12%22%11%1
80569
SeeingDay
17%12%30%24%13%3
14854
Night
17%10%32%29%10%1
24907

By Month

Percentage Cloud Cover SE (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
9%15%9%16%9%34435%23%
2527
11th to 20thDay
9%12%6%11%8%48%10%7%6%19%
2530
21st to endDay
14%18%8%12%6%33345%22%
2957
February1st to 10thDay
9%12%6%9%6%47%6%6%5%31%
1656
11th to 20thDay
10%11%47%6%45%6%5%7%33%
1610
21st to endDay
12%12%5%8%8%45%45%7%30%
1480
March1st to 10thDay
14%12%6%6%5%34445%36%
1800
11th to 20thDay
13%9%48%435%446%38%
1975
21st to endDay
17%12%36%5%35%5%5%7%31%
2299
April1st to 10thDay
16%11%5%8%6%35%446%31%
2160
11th to 20thDay
20%10%37%5%34445%33%
2134
21st to endDay
21%11%37%5%345%5%6%30%
2194
May1st to 10thDay
16%8%46%7%46%6%6%7%30%
2520
11th to 20thDay
17%8%36%7%35%5%6%8%33%
2479
21st to endDay
14%6%36%6%45%5%6%7%37%
2725
June1st to 10thDay
12%5%245%345%7%10%43%
2520
11th to 20thDay
12%6%36%6%445%6%8%40%
2520
21st to endDay
12%6%35%6%46%6%7%9%38%
2520
July1st to 10thDay
6%425%5%35%6%7%11%46%
2520
11th to 20thDay
8%425%5%36%6%6%11%44%
2520
21st to endDay
7%4245%345%8%8%47%
2743
August1st to 10thDay
7%426%7%5%6%8%7%10%38%
2436
11th to 20thDay
12%6%25%5%46%6%6%7%40%
2257
21st to endDay
10%6%25%5%3445%8%47%
2376
September1st to 10thDay
13%6%35%5%245%6%9%43%
2160
11th to 20thDay
12%425%5%35%5%5%8%46%
2152
21st to endDay
13%7%47%5%345%6%7%40%
1936
October1st to 10thDay
15%6%36%5%35%45%6%42%
1800
11th to 20thDay
17%12%26%5%345%5%8%33%
1800
21st to endDay
18%11%47%5%24335%37%
1850
November1st to 10thDay
12%9%46%445%447%41%
1672
11th to 20thDay
15%11%6%8%7%3445%8%29%
1583
21st to endDay
12%11%37%6%35%445%40%
1520
December1st to 10thDay
13%13%410%7%46%5%46%30%
1520
11th to 20thDay
12%13%5%9%7%46%5%5%6%28%
1918
21st to endDay
21%19%8%12%6%3433417%
2783
January1st to 10thNight
10%13%8%13%7%3444429%
4428
11th to 20thNight
10%12%7%13%9%47%8%7%419%
4440
21st to endNight
14%18%8%11%6%3444423%
4694
February1st to 10thNight
8%13%6%10%7%45%5%5%5%32%
2399
11th to 20thNight
10%8%48%6%45%5%5%7%38%
2237
21st to endNight
15%10%38%8%3445%6%32%
1776
March1st to 10thNight
13%9%46%6%45%6%5%6%36%
2160
11th to 20thNight
12%10%36%6%445%5%6%38%
1999
21st to endNight
18%10%46%5%34447%36%
2057
April1st to 10thNight
19%10%47%6%3435%6%34%
1800
11th to 20thNight
20%10%37%42435%6%37%
1775
21st to endNight
16%9%36%5%3445%9%36%
1762
May1st to 10thNight
19%9%35%6%35%5%5%8%33%
1440
11th to 20thNight
16%7%26%5%345%6%7%39%
1416
21st to endNight
12%7%35%5%345%6%8%44%
1551
June1st to 10thNight
10%435%4445%6%7%48%
1440
11th to 20thNight
12%6%37%5%245%6%8%44%
1440
21st to endNight
8%425%5%35%5%7%9%48%
1440
July1st to 10thNight
6%4244334410%56%
1440
11th to 20thNight
7%425%5%45%5%48%53%
1440
21st to endNight
4313435%7%6%9%55%
1575
August1st to 10thNight
6%426%445%5%8%8%49%
1500
11th to 20thNight
10%5%25%5%345%47%50%
1642
21st to endNight
10%5%1443445%7%53%
1980
September1st to 10thNight
10%5%36%42445%7%50%
1800
11th to 20thNight
11%5%14333448%53%
1800
21st to endNight
13%6%2443445%6%48%
2010
October1st to 10thNight
13%6%345%2445%6%48%
2160
11th to 20thNight
16%7%36%5%25%5%5%7%38%
2160
21st to endNight
17%10%36%6%345%46%35%
2506
November1st to 10thNight
14%8%36%5%3445%6%42%
2406
11th to 20thNight
13%12%410%7%35%5%46%32%
2593
21st to endNight
15%10%5%8%5%34446%37%
2660
December1st to 10thNight
12%12%5%8%9%45%5%5%8%29%
2660
11th to 20thNight
11%14%8%11%8%45%445%26%
3279
21st to endNight
23%15%6%10%7%34345%20%
4884

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
65%412%14%4
2528
11th to 20thDay
60%8%11%15%6%
2530
21st to endDay
64%5%12%14%4
2957
February1st to 10thDay
52%6%14%16%10%1
1656
11th to 20thDay
49%6%13%23%8%1
1619
21st to endDay
53%7%9%19%11%2
1480
March1st to 10thDay
52%5%12%21%9%1
1800
11th to 20thDay
46%6%12%22%13%1
1975
21st to endDay
53%6%11%21%8%1
2299
April1st to 10thDay
53%6%10%19%10%1
2160
11th to 20thDay
52%5%9%21%10%2
2134
21st to endDay
54%6%12%17%10%1
2194
May1st to 10thDay
51%7%14%20%7%1
2520
11th to 20thDay
48%7%12%21%10%2
2483
21st to endDay
44%8%11%20%14%2
2725
June1st to 10thDay
35%8%14%27%14%2
2520
11th to 20thDay
40%7%14%24%15%1
2520
21st to endDay
40%8%15%24%11%1
2520
July1st to 10thDay
32%9%16%29%13%2
2451
11th to 20thDay
33%8%16%24%18%2
2445
21st to endDay
31%8%17%27%14%2
2591
August1st to 10thDay
35%9%17%27%9%2
2421
11th to 20thDay
41%7%12%28%12%
2257
21st to endDay
35%7%13%26%18%1
2376
September1st to 10thDay
38%7%12%27%15%
2160
11th to 20thDay
36%7%15%31%10%1
2152
21st to endDay
41%6%13%28%12%
1936
October1st to 10thDay
42%5%12%30%11%
1800
11th to 20thDay
48%6%13%22%10%1
1800
21st to endDay
51%413%20%11%
1850
November1st to 10thDay
43%6%13%22%15%2
1672
11th to 20thDay
55%5%13%18%8%1
1583
21st to endDay
46%5%17%23%8%1
1520
December1st to 10thDay
56%6%14%17%7%1
1520
11th to 20thDay
56%7%15%14%7%1
1915
21st to endDay
72%5%7%12%4
2783
January1st to 10thNight
58%6%10%20%6%1
4428
11th to 20thNight
62%6%12%13%7%
4440
21st to endNight
64%6%10%15%5%
4694
February1st to 10thNight
54%5%11%20%9%2
2399
11th to 20thNight
47%6%11%25%9%1
2238
21st to endNight
51%5%12%20%10%2
1776
March1st to 10thNight
46%8%13%22%8%2
2160
11th to 20thNight
46%6%11%24%12%2
1999
21st to endNight
51%5%11%21%11%2
2057
April1st to 10thNight
51%5%9%18%15%2
1800
11th to 20thNight
48%5%8%21%14%3
1775
21st to endNight
46%6%12%19%14%2
1762
May1st to 10thNight
49%6%14%17%14%
1440
11th to 20thNight
43%6%13%21%15%1
1417
21st to endNight
37%8%13%24%16%1
1552
June1st to 10thNight
33%7%15%27%16%2
1440
11th to 20thNight
37%8%11%25%18%2
1440
21st to endNight
30%8%14%30%13%4
1440
July1st to 10thNight
24%6%14%36%17%3
1400
11th to 20thNight
30%7%15%27%19%2
1392
21st to endNight
23%8%19%30%16%4
1487
August1st to 10thNight
29%7%16%29%16%3
1491
11th to 20thNight
32%7%15%27%17%2
1642
21st to endNight
30%6%16%28%17%4
1980
September1st to 10thNight
33%6%11%28%21%1
1800
11th to 20thNight
29%7%15%32%16%1
1800
21st to endNight
36%5%10%31%17%1
2010
October1st to 10thNight
35%5%11%30%16%2
2160
11th to 20thNight
42%7%13%22%14%1
2160
21st to endNight
49%7%11%21%12%1
2506
November1st to 10thNight
43%5%12%24%14%2
2406
11th to 20thNight
53%6%13%17%10%1
2593
21st to endNight
50%5%14%23%7%1
2660
December1st to 10thNight
55%6%14%20%5%
2660
11th to 20thNight
60%6%11%17%6%
3281
21st to endNight
67%6%10%14%4
4884

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
18%15%32%23%9%3
270
11th to 20thDay
23%14%40%19%31
270
21st to endDay
22%17%35%21%4
297
February1st to 10thDay
16%19%42%17%41
252
11th to 20thDay
18%25%35%17%5%1
240
21st to endDay
22%20%43%14%2
198
March1st to 10thDay
18%23%36%16%6%
240
11th to 20thDay
23%15%33%19%7%3
240
21st to endDay
26%16%32%15%10%1
385
April1st to 10thDay
25%17%33%20%5%
420
11th to 20thDay
28%15%29%16%10%1
412
21st to endDay
24%17%27%21%8%2
428
May1st to 10thDay
22%17%30%24%6%1
603
11th to 20thDay
21%14%29%24%11%3
625
21st to endDay
18%11%26%26%15%4
679
June1st to 10thDay
10%8%33%28%18%3
630
11th to 20thDay
14%7%34%29%14%2
630
21st to endDay
15%7%32%27%13%5%
630
July1st to 10thDay
6%5%22%32%24%10%
621
11th to 20thDay
9%6%27%32%19%7%
618
21st to endDay
8%5%26%34%19%7%
684
August1st to 10thDay
9%5%24%32%23%8%
626
11th to 20thDay
15%5%22%26%25%8%
571
21st to endDay
14%7%23%29%20%6%
495
September1st to 10thDay
18%7%24%28%17%6%
450
11th to 20thDay
13%7%26%30%20%5%
450
21st to endDay
19%13%27%26%14%2
406
October1st to 10thDay
18%12%32%21%15%1
270
11th to 20thDay
24%20%31%18%6%
270
21st to endDay
26%17%34%16%5%1
297
November1st to 10thDay
17%15%36%24%6%2
270
11th to 20thDay
21%20%36%20%21
270
21st to endDay
20%16%44%13%7%
270
December1st to 10thDay
16%19%37%22%6%
270
11th to 20thDay
19%18%38%18%6%1
270
21st to endDay
27%18%37%16%1
297
January1st to 10thNight
15%15%37%25%7%1
950
11th to 20thNight
18%14%35%27%5%1
950
21st to endNight
19%12%35%26%7%
1045
February1st to 10thNight
16%13%38%26%6%
923
11th to 20thNight
14%15%40%23%7%
843
21st to endNight
22%16%36%22%3
592
March1st to 10thNight
19%13%35%26%7%
720
11th to 20thNight
20%12%32%27%8%
559
21st to endNight
22%12%29%26%10%2
594
April1st to 10thNight
24%11%38%21%5%
540
11th to 20thNight
26%11%30%27%6%
533
21st to endNight
21%11%34%26%8%1
540
May1st to 10thNight
23%8%35%30%4
540
11th to 20thNight
17%9%31%34%8%1
531
21st to endNight
15%5%30%34%15%1
584
June1st to 10thNight
10%8%31%41%11%
540
11th to 20thNight
13%6%29%40%11%
540
21st to endNight
9%5%25%43%17%1
540
July1st to 10thNight
7%319%41%28%2
525
11th to 20thNight
9%5%23%38%23%2
522
21st to endNight
6%219%50%21%3
591
August1st to 10thNight
8%219%46%24%1
537
11th to 20thNight
12%317%37%27%4
534
21st to endNight
12%5%22%39%21%2
594
September1st to 10thNight
14%424%37%17%4
540
11th to 20thNight
13%427%31%21%3
540
21st to endNight
16%10%28%32%13%1
710
October1st to 10thNight
16%9%28%29%17%1
720
11th to 20thNight
21%13%32%27%7%
720
21st to endNight
22%10%31%28%8%
792
November1st to 10thNight
18%11%36%27%8%1
740
11th to 20thNight
18%15%39%22%5%
883
21st to endNight
20%14%37%23%6%
950
December1st to 10thNight
18%13%39%24%5%1
950
11th to 20thNight
21%14%36%22%6%1
950
21st to endNight
27%13%33%22%4
1045
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