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Venus
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Venus clear sky chart from 2005-11-06 to 2024-01-16.

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
61%
24708
19%
74548
16%
24655
65%
24655
29%
47326

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
51%
758
22%
2459
16%
757
60%
757
31%
1424
January11th to 20thNight
51%
741
25%
2406
21%
741
60%
741
30%
1415
January21st to endNight
44%
792
24%
2483
17%
792
54%
792
28%
1505
February1st to 10thNight
49%
720
22%
2160
17%
720
55%
720
29%
1333
February11th to 20thNight
53%
700
26%
2098
17%
699
63%
699
40%
1153
February21st to endNight
56%
592
33%
1628
22%
592
65%
592
43%
899
March1st to 10thNight
54%
720
32%
1980
20%
720
63%
720
50%
1044
March11th to 20thNight
57%
720
30%
1980
20%
720
65%
720
43%
1110
March21st to endNight
56%
792
31%
2178
22%
792
63%
792
46%
1194
April1st to 10thNight
60%
720
25%
1980
19%
720
65%
720
44%
1101
April11th to 20thNight
57%
711
20%
1927
14%
711
61%
711
37%
1153
April21st to endNight
60%
720
29%
1800
18%
720
65%
720
44%
1071
May1st to 10thNight
66%
702
27%
1782
17%
702
70%
702
50%
994
May11th to 20thNight
70%
531
16%
1592
13%
531
72%
531
33%
987
May21st to endNight
73%
582
19%
1744
16%
582
74%
582
28%
1120
June1st to 10thNight
65%
540
12%
1620
10%
540
65%
540
19%
1194
June11th to 20thNight
75%
540
10%
1620
9%
540
75%
540
23%
1141
June21st to endNight
73%
540
10%
1620
9%
540
73%
540
21%
1211
July1st to 10thNight
72%
525
5%
1575
5%
525
72%
525
19%
1197
July11th to 20thNight
76%
522
5%
1566
6%
522
76%
522
20%
1179
July21st to endNight
73%
591
6%
1672
7%
558
73%
558
20%
1260
August1st to 10thNight
75%
537
6%
1600
5%
534
75%
534
20%
1190
August11th to 20thNight
74%
618
4%
1757
5%
618
74%
618
20%
1284
August21st to endNight
59%
792
6%
2178
6%
792
59%
792
15%
1709
September1st to 10thNight
65%
720
5%
1980
5%
720
66%
720
17%
1508
September11th to 20thNight
61%
720
6%
1980
6%
720
62%
720
17%
1511
September21st to endNight
57%
720
11%
1980
11%
720
58%
720
18%
1468
October1st to 10thNight
64%
720
17%
2002
17%
720
66%
720
26%
1341
October11th to 20thNight
64%
720
23%
2160
23%
720
68%
720
31%
1323
October21st to endNight
62%
792
25%
2376
23%
792
66%
792
35%
1388
November1st to 10thNight
58%
740
25%
2221
22%
740
65%
740
35%
1295
November11th to 20thNight
57%
760
26%
2280
23%
760
63%
760
32%
1380
November21st to endNight
56%
760
28%
2280
24%
760
63%
760
33%
1341
December1st to 10thNight
62%
760
28%
2470
25%
760
69%
760
35%
1370
December11th to 20thNight
56%
760
24%
2939
22%
758
61%
758
26%
1681
December21st to endNight
55%
830
13%
4475
20%
817
61%
817
16%
2852

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
8%5%37%7%5%6%7%7%9%37%
74883
Night
8%5%35%6%35%6%6%9%44%
74917
TransparencyDay
40%10%15%17%13%4
74606
Night
34%10%17%20%14%5%
74713
SeeingDay
8%416%25%25%22%
14581
Night
8%317%34%28%10%
24721

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
7%6%35%5%46%5%7%8%45%
1706
11th to 20thDay
9%326%5%346%6%11%45%
1665
21st to endDay
11%436%5%45%6%5%7%44%
1870
February1st to 10thDay
11%5%25%435%6%5%8%46%
1800
11th to 20thDay
5%3245%35%45%9%55%
1748
21st to endDay
7%3245%45%5%5%10%50%
1625
March1st to 10thDay
42245%35%5%5%9%56%
1980
11th to 20thDay
6%4245%445%6%8%52%
1980
21st to endDay
5%325%6%445%5%9%53%
2178
April1st to 10thDay
43246%5%6%6%7%9%47%
1980
11th to 20thDay
6%5%25%6%47%6%7%9%41%
1982
21st to endDay
6%4245%45%5%6%9%51%
2160
May1st to 10thDay
5%324445%6%6%9%54%
2190
11th to 20thDay
9%5%36%7%47%8%9%8%35%
2301
21st to endDay
7%6%39%9%5%7%7%6%9%32%
2531
June1st to 10thDay
13%10%49%9%6%7%7%8%7%21%
2340
11th to 20thDay
8%5%39%11%6%9%8%8%9%24%
2340
21st to endDay
9%7%39%9%6%8%8%7%9%24%
2340
July1st to 10thDay
10%7%5%8%9%6%8%8%7%10%21%
2340
11th to 20thDay
8%5%38%9%7%8%9%9%11%23%
2340
21st to endDay
8%6%49%9%6%9%9%9%10%22%
2547
August1st to 10thDay
6%6%38%10%6%8%9%9%11%24%
2327
11th to 20thDay
6%6%38%10%8%9%9%8%10%24%
2119
21st to endDay
10%7%39%10%6%9%8%8%9%21%
2178
September1st to 10thDay
7%8%38%10%5%7%8%9%11%22%
1980
11th to 20thDay
9%7%39%10%6%8%8%9%8%23%
1980
21st to endDay
10%7%39%9%6%7%7%8%9%27%
1980
October1st to 10thDay
8%5%37%8%47%6%7%8%35%
1956
11th to 20thDay
8%5%36%7%37%7%6%8%40%
1800
21st to endDay
8%435%6%45%5%7%9%44%
1980
November1st to 10thDay
6%5%36%6%35%6%7%8%46%
1857
11th to 20thDay
10%5%36%6%35%5%6%9%42%
1900
21st to endDay
8%5%25%5%36%5%6%8%46%
1896
December1st to 10thDay
9%5%25%435%46%9%48%
1710
11th to 20thDay
10%5%35%5%36%5%5%9%44%
2153
21st to endDay
10%7%36%8%46%6%7%8%34%
3124
January1st to 10thNight
8%5%35%5%35%46%9%47%
2459
11th to 20thNight
8%5%25%6%35%5%6%9%46%
2406
21st to endNight
10%5%35%6%25%6%6%7%45%
2483
February1st to 10thNight
8%6%36%6%35%5%6%8%45%
2160
11th to 20thNight
7%4234345%6%7%55%
2098
21st to endNight
5%425%434448%57%
1628
March1st to 10thNight
431343436%9%60%
1980
11th to 20thNight
6%413435%45%9%56%
1980
21st to endNight
332443446%8%59%
2178
April1st to 10thNight
5%3243345%7%9%56%
1980
11th to 20thNight
4326%6%35%5%7%10%49%
1927
21st to endNight
5%424435%45%8%56%
1800
May1st to 10thNight
33145%2345%7%61%
1782
11th to 20thNight
7%5%25%5%36%6%7%9%46%
1592
21st to endNight
6%426%6%47%7%7%10%42%
1744
June1st to 10thNight
12%7%37%7%46%7%6%9%32%
1620
11th to 20thNight
7%5%36%6%46%7%11%14%30%
1620
21st to endNight
6%5%38%8%47%7%9%11%32%
1620
July1st to 10thNight
10%6%37%7%47%7%8%11%29%
1620
11th to 20thNight
6%6%37%7%47%8%9%12%30%
1620
21st to endNight
6%6%37%8%5%7%8%9%12%30%
1771
August1st to 10thNight
6%5%37%7%5%7%7%10%12%31%
1611
11th to 20thNight
6%5%36%8%47%8%9%12%33%
1757
21st to endNight
10%6%46%9%5%7%7%8%10%27%
2178
September1st to 10thNight
7%7%36%8%5%7%9%9%11%30%
1980
11th to 20thNight
9%7%48%7%47%8%7%10%29%
1980
21st to endNight
11%7%38%8%45%7%6%9%30%
1980
October1st to 10thNight
10%5%36%6%35%6%6%10%40%
2002
11th to 20thNight
8%6%35%5%35%5%6%8%47%
2160
21st to endNight
8%5%25%5%35%46%9%47%
2376
November1st to 10thNight
9%5%25%4345%5%7%51%
2221
11th to 20thNight
7%5%35%6%35%5%5%8%47%
2280
21st to endNight
9%5%25%5%3446%9%48%
2280
December1st to 10thNight
6%4246%35%46%8%52%
2470
11th to 20thNight
10%5%35%5%34447%49%
3042
21st to endNight
10%8%37%7%46%6%6%9%35%
4532

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
35%7%10%21%19%8%
1707
11th to 20thDay
32%6%11%22%22%6%
1665
21st to endDay
38%7%8%19%19%9%
1870
February1st to 10thDay
34%7%11%21%20%8%
1800
11th to 20thDay
26%6%11%25%22%11%
1758
21st to endDay
29%6%13%19%23%10%
1625
March1st to 10thDay
24%6%13%23%25%9%
1980
11th to 20thDay
28%6%12%26%21%8%
1980
21st to endDay
27%6%10%26%22%9%
2178
April1st to 10thDay
30%9%15%24%16%6%
1980
11th to 20thDay
36%10%12%19%19%5%
1982
21st to endDay
28%7%11%22%25%7%
2160
May1st to 10thDay
25%8%13%21%25%8%
2190
11th to 20thDay
40%11%15%18%15%1
2305
21st to endDay
45%10%14%16%14%1
2531
June1st to 10thDay
56%12%16%12%31
2340
11th to 20thDay
50%14%18%15%2
2340
21st to endDay
54%13%20%11%2
2340
July1st to 10thDay
53%18%22%7%1
2275
11th to 20thDay
50%17%24%8%
2271
21st to endDay
50%17%22%10%1
2405
August1st to 10thDay
47%16%29%7%1
2314
11th to 20thDay
48%17%26%8%
2119
21st to endDay
55%16%19%8%2
2178
September1st to 10thDay
49%17%20%13%1
1980
11th to 20thDay
52%15%20%11%2
1980
21st to endDay
51%13%17%11%7%2
1980
October1st to 10thDay
44%10%14%17%11%4
1956
11th to 20thDay
38%9%12%20%16%4
1800
21st to endDay
35%6%13%17%20%9%
1980
November1st to 10thDay
33%7%13%19%16%11%
1857
11th to 20thDay
37%7%10%21%17%7%
1900
21st to endDay
35%7%12%22%20%6%
1896
December1st to 10thDay
33%6%15%23%18%5%
1710
11th to 20thDay
35%8%10%19%17%11%
2150
21st to endDay
44%8%12%18%15%3
3124
January1st to 10thNight
32%7%14%22%18%7%
2459
11th to 20thNight
33%7%11%27%17%6%
2406
21st to endNight
36%7%12%21%17%8%
2483
February1st to 10thNight
35%8%13%19%18%8%
2160
11th to 20thNight
26%6%11%24%24%9%
2099
21st to endNight
26%5%13%22%28%7%
1628
March1st to 10thNight
20%5%14%30%23%8%
1980
11th to 20thNight
24%7%15%30%18%6%
1980
21st to endNight
22%7%14%27%23%7%
2178
April1st to 10thNight
22%8%18%29%15%7%
1980
11th to 20thNight
28%9%18%21%20%4
1927
21st to endNight
26%7%12%28%22%6%
1800
May1st to 10thNight
22%6%14%28%22%9%
1782
11th to 20thNight
31%10%21%24%13%1
1593
21st to endNight
34%11%18%20%17%
1745
June1st to 10thNight
47%12%18%17%5%
1620
11th to 20thNight
38%16%26%17%2
1620
21st to endNight
40%19%23%14%4
1620
July1st to 10thNight
44%17%27%11%1
1575
11th to 20thNight
41%19%28%11%1
1566
21st to endNight
41%19%28%12%
1672
August1st to 10thNight
40%19%29%12%
1600
11th to 20thNight
39%19%33%7%1
1757
21st to endNight
48%18%23%10%1
2178
September1st to 10thNight
42%21%25%11%1
1980
11th to 20thNight
47%16%21%14%2
1980
21st to endNight
48%13%19%12%8%
1980
October1st to 10thNight
38%11%18%17%13%3
2002
11th to 20thNight
34%8%15%19%21%3
2160
21st to endNight
32%6%16%17%21%9%
2376
November1st to 10thNight
31%7%13%19%21%9%
2221
11th to 20thNight
35%6%12%23%17%7%
2280
21st to endNight
33%6%13%21%22%5%
2280
December1st to 10thNight
29%7%13%29%17%5%
2470
11th to 20thNight
34%6%10%22%17%11%
3044
21st to endNight
43%10%15%15%13%5%
4532

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
10%7%40%29%13%1
270
11th to 20thDay
10%10%31%31%14%4
255
21st to endDay
13%12%44%25%5%
264
February1st to 10thDay
8%8%31%31%19%3
240
11th to 20thDay
8%428%34%21%5%
240
21st to endDay
5%6%23%35%27%4
343
March1st to 10thDay
47%33%35%19%3
420
11th to 20thDay
8%5%27%34%24%3
420
21st to endDay
36%23%32%31%4
462
April1st to 10thDay
5%8%28%33%21%5%
420
11th to 20thDay
7%425%35%22%8%
412
21st to endDay
5%419%35%29%8%
420
May1st to 10thDay
5%216%31%33%14%
423
11th to 20thDay
10%215%23%32%18%
447
21st to endDay
9%26%22%31%30%
485
June1st to 10thDay
14%49%19%26%28%
450
11th to 20thDay
8%25%16%28%41%
450
21st to endDay
7%412%25%52%
450
July1st to 10thDay
7%2210%20%59%
445
11th to 20thDay
5%1312%28%51%
444
21st to endDay
7%2416%23%48%
488
August1st to 10thDay
6%1310%29%51%
446
11th to 20thDay
5%311%28%52%
439
21st to endDay
9%26%18%27%38%
495
September1st to 10thDay
6%26%14%27%45%
450
11th to 20thDay
6%37%14%29%40%
450
21st to endDay
9%25%18%34%32%
450
October1st to 10thDay
11%110%35%30%14%
450
11th to 20thDay
7%414%32%32%11%
450
21st to endDay
7%317%31%33%10%
495
November1st to 10thDay
9%5%19%30%28%10%
455
11th to 20thDay
13%325%35%18%5%
460
21st to endDay
7%423%38%23%4
456
December1st to 10thDay
9%8%26%32%20%5%
270
11th to 20thDay
10%7%28%33%18%4
270
21st to endDay
8%6%26%37%20%4
297
January1st to 10thNight
10%6%26%40%17%1
760
11th to 20thNight
10%5%27%43%15%1
741
21st to endNight
12%7%30%38%12%
792
February1st to 10thNight
11%6%26%42%15%
720
11th to 20thNight
7%6%29%42%15%1
703
21st to endNight
7%428%46%15%
592
March1st to 10thNight
4434%44%13%1
720
11th to 20thNight
6%426%46%17%1
720
21st to endNight
4330%48%15%
792
April1st to 10thNight
6%426%46%19%
720
11th to 20thNight
5%427%45%18%1
711
21st to endNight
6%325%47%20%
720
May1st to 10thNight
4220%44%28%3
702
11th to 20thNight
8%211%43%33%4
531
21st to endNight
6%28%34%42%8%
584
June1st to 10thNight
14%15%26%41%12%
540
11th to 20thNight
7%2416%48%23%
540
21st to endNight
6%1313%45%32%
540
July1st to 10thNight
9%236%44%37%
525
11th to 20thNight
5%139%42%39%
522
21st to endNight
7%129%43%39%
591
August1st to 10thNight
6%1210%46%36%
537
11th to 20thNight
7%129%42%38%
618
21st to endNight
11%26%18%36%26%
792
September1st to 10thNight
8%17%16%40%28%
720
11th to 20thNight
10%26%18%45%18%
720
21st to endNight
16%26%22%39%15%
720
October1st to 10thNight
11%211%38%31%7%
720
11th to 20thNight
9%312%36%35%5%
720
21st to endNight
11%217%40%26%5%
792
November1st to 10thNight
9%421%40%24%2
740
11th to 20thNight
8%424%39%22%3
760
21st to endNight
11%322%43%20%1
760
December1st to 10thNight
6%421%41%26%2
760
11th to 20thNight
10%5%22%38%23%2
760
21st to endNight
9%424%41%21%1
836
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