Hyampom
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hyampom clear sky chart from 2005-11-06 to 2024-01-15.

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
55%
23250
22%
74803
20%
23199
59%
23199
28%
45673

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
37%
756
11%
2608
10%
756
40%
756
13%
1953
January11th to 20thNight
41%
736
15%
2392
13%
736
45%
736
16%
1716
January21st to endNight
43%
792
22%
2574
21%
792
47%
792
20%
1753
February1st to 10thNight
44%
720
20%
2340
19%
720
49%
720
21%
1570
February11th to 20thNight
42%
700
17%
2274
16%
700
47%
700
19%
1569
February21st to endNight
37%
592
16%
1808
13%
592
42%
592
18%
1282
March1st to 10thNight
33%
720
12%
1980
8%
720
37%
720
16%
1516
March11th to 20thNight
42%
720
14%
1980
11%
720
44%
720
20%
1444
March21st to endNight
32%
792
10%
2178
6%
792
35%
792
16%
1644
April1st to 10thNight
37%
720
15%
1810
7%
720
40%
720
20%
1345
April11th to 20thNight
41%
711
17%
1779
8%
711
44%
711
24%
1261
April21st to endNight
49%
630
18%
1710
9%
630
52%
630
31%
1087
May1st to 10thNight
53%
540
24%
1620
15%
540
60%
540
37%
897
May11th to 20thNight
58%
437
21%
1499
19%
437
62%
437
29%
853
May21st to endNight
57%
389
20%
1552
19%
388
65%
388
27%
829
June1st to 10thNight
59%
360
19%
1440
22%
360
65%
360
28%
771
June11th to 20thNight
65%
360
30%
1440
34%
360
75%
360
50%
571
June21st to endNight
80%
360
32%
1440
44%
360
84%
360
59%
514
July1st to 10thNight
85%
350
32%
1400
43%
350
89%
350
64%
481
July11th to 20thNight
87%
429
35%
1473
41%
429
89%
429
70%
539
July21st to endNight
91%
591
40%
1674
36%
558
93%
558
81%
637
August1st to 10thNight
90%
537
39%
1602
35%
534
91%
534
75%
634
August11th to 20thNight
90%
534
42%
1602
32%
534
92%
534
77%
620
August21st to endNight
85%
772
43%
1960
29%
772
86%
772
78%
887
September1st to 10thNight
80%
720
42%
1800
27%
720
82%
720
73%
844
September11th to 20thNight
74%
720
37%
1854
26%
720
77%
720
56%
967
September21st to endNight
69%
720
34%
2034
30%
720
74%
720
49%
1063
October1st to 10thNight
64%
720
24%
2160
23%
720
69%
720
44%
1118
October11th to 20thNight
64%
720
28%
2160
29%
720
68%
720
40%
1184
October21st to endNight
61%
792
29%
2376
28%
792
65%
792
34%
1378
November1st to 10thNight
50%
740
20%
2267
19%
740
53%
740
22%
1543
November11th to 20thNight
48%
760
14%
2636
14%
760
50%
760
17%
1817
November21st to endNight
50%
760
18%
2660
19%
760
53%
760
22%
1677
December1st to 10thNight
45%
760
17%
2660
16%
760
49%
760
20%
1769
December11th to 20thNight
39%
760
13%
3235
13%
759
44%
759
11%
2452
December21st to endNight
33%
830
9%
4826
14%
817
37%
817
8%
3488

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
9%6%25%424446%53%
74706
Night
10%7%35%5%3445%6%47%
75074
TransparencyDay
33%5%9%19%21%12%
74421
Night
37%6%10%18%18%11%
74880
SeeingDay
16%13%26%25%15%5%
14036
Night
14%7%18%30%25%5%
23264

By Month

Percentage Cloud Cover SW (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
20%13%48%6%45%45%6%25%
1552
11th to 20thDay
17%11%36%5%34445%38%
1657
21st to endDay
14%12%46%5%34447%37%
1782
February1st to 10thDay
15%9%36%435%5%5%5%38%
1620
11th to 20thDay
11%11%37%5%3445%8%38%
1575
21st to endDay
15%14%47%434448%32%
1446
March1st to 10thDay
16%15%6%9%6%345%45%27%
1980
11th to 20thDay
18%11%47%5%3345%8%32%
1980
21st to endDay
16%13%48%6%45%45%7%28%
2178
April1st to 10thDay
15%12%37%6%35%46%8%31%
2148
11th to 20thDay
14%11%36%43445%8%38%
2129
21st to endDay
7%9%35%6%2346%8%47%
2246
May1st to 10thDay
7%6%2442445%7%54%
2340
11th to 20thDay
8%5%26%5%3445%8%50%
2391
21st to endDay
9%6%35%5%3435%9%49%
2723
June1st to 10thDay
7%5%25%5%345%5%7%52%
2520
11th to 20thDay
4324323348%65%
2520
21st to endDay
311221323476%
2520
July1st to 10thDay
211121223481%
2520
11th to 20thDay
211111223481%
2434
21st to endDay
1111111225%84%
2546
August1st to 10thDay
11121223482%
2328
11th to 20thDay
11121222286%
2298
21st to endDay
1111212245%82%
2394
September1st to 10thDay
111221133481%
2160
11th to 20thDay
321343445%7%65%
2103
21st to endDay
4214322346%68%
1926
October1st to 10thDay
7%314333245%65%
1800
11th to 20thDay
9%414424447%58%
1800
21st to endDay
10%5%25%44445%6%51%
1980
November1st to 10thDay
14%7%37%6%4446%8%37%
1809
11th to 20thDay
14%7%27%6%46%47%10%32%
1539
21st to endDay
13%9%36%5%4445%7%40%
1520
December1st to 10thDay
13%8%47%6%46%45%6%37%
1520
11th to 20thDay
25%12%48%7%45%445%22%
1928
21st to endDay
20%13%48%7%46%6%5%6%22%
2794
January1st to 10thNight
17%12%48%6%46%5%6%6%26%
2608
11th to 20thNight
16%11%47%7%35%5%5%7%32%
2392
21st to endNight
14%11%46%6%35%35%6%36%
2574
February1st to 10thNight
12%11%37%6%35%5%5%8%36%
2340
11th to 20thNight
11%12%38%7%35%45%6%35%
2272
21st to endNight
13%10%48%5%45%5%5%7%34%
1808
March1st to 10thNight
15%14%6%7%6%45%6%5%7%26%
1980
11th to 20thNight
16%12%48%6%35%45%9%30%
1980
21st to endNight
14%13%5%6%8%45%5%6%5%29%
2178
April1st to 10thNight
12%10%48%7%45%5%7%8%32%
1810
11th to 20thNight
8%9%5%8%7%345%5%8%38%
1779
21st to endNight
6%8%37%6%245%6%7%46%
1710
May1st to 10thNight
7%5%25%424447%55%
1620
11th to 20thNight
4426%6%46%6%5%9%47%
1499
21st to endNight
6%6%25%435%449%52%
1552
June1st to 10thNight
6%5%45%5%35%5%6%9%50%
1440
11th to 20thNight
3212322347%70%
1440
21st to endNight
3212111335%77%
1440
July1st to 10thNight
21121232482%
1440
11th to 20thNight
121121223383%
1521
21st to endNight
1111212486%
1773
August1st to 10thNight
11121123483%
1611
11th to 20thNight
11111223485%
1602
21st to endNight
111221222483%
1960
September1st to 10thNight
1212211235%80%
1800
11th to 20thNight
2324424337%67%
1854
21st to endNight
3315%423345%66%
2034
October1st to 10thNight
6%315%423446%62%
2160
11th to 20thNight
7%6%245%3335%7%57%
2160
21st to endNight
10%425%42445%7%52%
2376
November1st to 10thNight
12%8%36%7%45%6%5%6%37%
2267
11th to 20thNight
14%8%36%7%47%5%6%8%32%
2636
21st to endNight
12%7%36%5%35%46%8%42%
2660
December1st to 10thNight
17%8%47%5%3445%7%37%
2660
11th to 20thNight
25%12%37%5%345%47%24%
3276
21st to endNight
19%13%48%8%45%5%45%25%
4862

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
59%7%8%16%6%5%
1552
11th to 20thDay
48%6%8%12%13%12%
1657
21st to endDay
49%48%13%18%8%
1782
February1st to 10thDay
47%6%10%17%14%7%
1620
11th to 20thDay
44%6%10%19%16%3
1584
21st to endDay
51%8%11%15%12%4
1446
March1st to 10thDay
59%6%7%14%11%2
1980
11th to 20thDay
51%6%12%14%15%3
1980
21st to endDay
56%7%12%14%8%2
2178
April1st to 10thDay
51%7%13%16%10%2
2148
11th to 20thDay
44%8%12%20%12%4
2132
21st to endDay
34%8%15%25%15%3
2246
May1st to 10thDay
30%6%15%30%16%4
2340
11th to 20thDay
34%6%12%26%17%4
2394
21st to endDay
33%6%15%33%12%1
2724
June1st to 10thDay
30%7%13%29%18%3
2520
11th to 20thDay
19%5%12%27%28%8%
2520
21st to endDay
14%38%23%34%19%
2520
July1st to 10thDay
10%36%21%31%30%
2451
11th to 20thDay
9%3419%33%33%
2359
21st to endDay
6%2414%36%37%
2405
August1st to 10thDay
8%36%25%38%20%
2312
11th to 20thDay
7%25%16%44%25%
2298
21st to endDay
6%37%21%37%27%
2394
September1st to 10thDay
8%26%14%32%37%
2160
11th to 20thDay
20%48%23%34%11%
2103
21st to endDay
17%49%22%27%21%
1926
October1st to 10thDay
23%47%23%23%20%
1800
11th to 20thDay
27%5%10%21%23%14%
1800
21st to endDay
32%7%9%18%17%17%
1980
November1st to 10thDay
44%7%10%16%15%8%
1809
11th to 20thDay
46%7%12%14%12%9%
1539
21st to endDay
45%6%9%14%16%11%
1520
December1st to 10thDay
47%5%8%13%18%9%
1520
11th to 20thDay
64%6%7%10%11%3
1928
21st to endDay
60%9%7%11%10%3
2794
January1st to 10thNight
56%8%10%13%8%5%
2608
11th to 20thNight
52%7%8%10%12%11%
2392
21st to endNight
49%5%8%14%16%8%
2574
February1st to 10thNight
47%6%9%18%14%6%
2340
11th to 20thNight
49%6%9%17%14%5%
2274
21st to endNight
48%8%13%18%10%3
1808
March1st to 10thNight
57%7%9%14%13%1
1980
11th to 20thNight
52%6%12%14%14%2
1980
21st to endNight
54%8%14%16%7%2
2178
April1st to 10thNight
50%8%15%15%10%3
1810
11th to 20thNight
44%8%16%17%11%4
1779
21st to endNight
35%8%17%25%13%2
1710
May1st to 10thNight
28%5%14%30%18%4
1620
11th to 20thNight
31%9%15%25%15%5%
1499
21st to endNight
30%8%17%33%12%
1552
June1st to 10thNight
31%7%13%30%17%2
1440
11th to 20thNight
14%5%14%34%25%8%
1440
21st to endNight
12%27%26%35%18%
1440
July1st to 10thNight
9%35%22%32%29%
1400
11th to 20thNight
9%25%16%35%33%
1473
21st to endNight
6%1312%38%40%
1674
August1st to 10thNight
7%25%26%37%23%
1602
11th to 20thNight
6%25%18%42%26%
1602
21st to endNight
8%25%22%37%27%
1960
September1st to 10thNight
10%26%15%32%35%
1800
11th to 20thNight
18%49%26%32%11%
1854
21st to endNight
21%5%8%19%23%24%
2034
October1st to 10thNight
23%410%16%24%21%
2160
11th to 20thNight
28%411%20%23%14%
2160
21st to endNight
31%6%11%18%18%16%
2376
November1st to 10thNight
45%8%11%12%15%8%
2267
11th to 20thNight
48%9%12%14%11%7%
2636
21st to endNight
41%7%10%14%17%10%
2660
December1st to 10thNight
47%6%9%12%18%8%
2660
11th to 20thNight
60%6%7%11%13%2
3276
21st to endNight
57%9%10%13%8%3
4862

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
41%15%22%15%6%1
213
11th to 20thDay
30%13%27%15%10%4
353
21st to endDay
22%17%22%20%15%3
374
February1st to 10thDay
23%16%26%20%14%1
340
11th to 20thDay
29%17%23%19%9%2
335
21st to endDay
28%22%23%18%8%1
328
March1st to 10thDay
32%22%25%15%42
420
11th to 20thDay
27%18%26%18%8%2
420
21st to endDay
29%22%25%17%6%
462
April1st to 10thDay
27%19%28%18%7%1
420
11th to 20thDay
29%18%25%19%8%2
412
21st to endDay
16%23%30%18%10%3
420
May1st to 10thDay
18%17%30%21%11%3
423
11th to 20thDay
18%21%27%21%10%4
448
21st to endDay
16%13%28%23%15%5%
485
June1st to 10thDay
12%15%26%29%12%5%
450
11th to 20thDay
12%16%32%24%12%4
450
21st to endDay
39%33%28%19%7%
450
July1st to 10thDay
37%31%35%17%7%
446
11th to 20thDay
5%28%35%24%7%
444
21st to endDay
1323%38%25%10%
487
August1st to 10thDay
1329%36%21%10%
447
11th to 20thDay
15%25%33%22%13%
437
21st to endDay
2424%35%26%8%
495
September1st to 10thDay
29%23%40%19%7%
450
11th to 20thDay
6%9%25%33%22%4
450
21st to endDay
8%9%26%32%20%4
450
October1st to 10thDay
10%10%26%26%20%8%
450
11th to 20thDay
13%9%18%26%26%7%
450
21st to endDay
16%12%20%28%18%6%
495
November1st to 10thDay
20%12%24%23%14%7%
405
11th to 20thDay
15%11%21%26%19%8%
189
21st to endDay
21%10%21%24%21%3
180
December1st to 10thDay
24%13%22%19%12%9%
180
11th to 20thDay
28%17%16%22%11%6%
180
21st to endDay
27%14%22%22%15%1
198
January1st to 10thNight
26%8%23%26%13%4
760
11th to 20thNight
23%10%21%27%14%5%
736
21st to endNight
21%9%21%26%18%5%
792
February1st to 10thNight
21%10%20%33%14%2
720
11th to 20thNight
20%9%22%28%18%3
704
21st to endNight
20%13%26%29%12%1
592
March1st to 10thNight
24%15%22%23%12%3
720
11th to 20thNight
24%9%18%29%17%2
720
21st to endNight
24%14%24%24%12%2
792
April1st to 10thNight
18%13%25%26%16%2
720
11th to 20thNight
17%12%23%27%15%4
711
21st to endNight
13%10%23%31%19%3
630
May1st to 10thNight
10%8%23%32%23%4
540
11th to 20thNight
8%8%21%29%31%4
437
21st to endNight
10%7%23%31%26%3
389
June1st to 10thNight
7%7%21%33%30%3
360
11th to 20thNight
45%23%40%26%1
360
21st to endNight
4112%40%40%3
360
July1st to 10thNight
2110%41%41%4
350
11th to 20thNight
27%36%48%6%
429
21st to endNight
15%28%56%11%
591
August1st to 10thNight
1434%50%11%
537
11th to 20thNight
17%36%47%10%
534
21st to endNight
1110%39%42%7%
772
September1st to 10thNight
2214%35%39%9%
720
11th to 20thNight
4412%37%34%10%
720
21st to endNight
5%6%16%30%35%9%
720
October1st to 10thNight
8%419%31%33%5%
720
11th to 20thNight
11%416%29%32%8%
720
21st to endNight
14%5%13%33%25%9%
792
November1st to 10thNight
15%8%19%30%21%6%
740
11th to 20thNight
17%8%20%32%19%3
760
21st to endNight
17%10%19%31%20%4
760
December1st to 10thNight
22%8%19%28%18%4
760
11th to 20thNight
28%10%17%27%14%3
760
21st to endNight
29%12%20%26%11%3
836
Page generated at 2024-01-11 19:33:52. Version ac07

Copyright 2024 Attilla Danko


Hyampom Clear Sky Chart |Charts Home