Gipe Farm
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Gipe Farm clear sky chart from 2005-11-06 to 2024-01-17.

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%
24640
21%
74794
12%
24577
47%
24577
29%
46206

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
31%
950
20%
2458
8%
946
40%
946
27%
1644
January11th to 20thNight
29%
933
20%
2425
8%
933
37%
933
24%
1694
January21st to endNight
26%
990
21%
2574
7%
990
35%
990
24%
1771
February1st to 10thNight
26%
900
14%
2340
5%
900
31%
900
22%
1674
February11th to 20thNight
27%
879
18%
2274
6%
875
34%
875
28%
1519
February21st to endNight
25%
609
24%
1793
5%
609
41%
609
28%
1137
March1st to 10thNight
29%
540
23%
1980
12%
540
43%
540
25%
1159
March11th to 20thNight
30%
540
21%
1980
14%
540
41%
540
22%
1221
March21st to endNight
23%
594
12%
2178
7%
594
32%
594
15%
1517
April1st to 10thNight
27%
540
19%
1902
13%
540
38%
540
24%
1132
April11th to 20thNight
26%
533
23%
1717
12%
533
41%
533
24%
1064
April21st to endNight
31%
540
21%
1620
13%
540
44%
540
25%
1052
May1st to 10thNight
35%
540
15%
1620
11%
540
42%
540
23%
1081
May11th to 20thNight
40%
531
18%
1594
12%
531
47%
531
26%
1020
May21st to endNight
42%
584
13%
1622
7%
582
46%
582
27%
1086
June1st to 10thNight
59%
540
23%
1440
12%
540
63%
540
43%
824
June11th to 20thNight
54%
540
22%
1440
10%
540
59%
540
43%
832
June21st to endNight
52%
540
21%
1440
9%
540
57%
540
44%
822
July1st to 10thNight
68%
525
18%
1484
12%
525
69%
525
43%
829
July11th to 20thNight
70%
522
22%
1566
16%
522
73%
522
48%
798
July21st to endNight
73%
591
25%
1673
21%
558
76%
558
48%
851
August1st to 10thNight
65%
537
20%
1601
22%
534
66%
534
37%
909
August11th to 20thNight
66%
534
28%
1600
31%
534
71%
534
41%
876
August21st to endNight
64%
594
28%
1854
28%
594
69%
594
42%
977
September1st to 10thNight
55%
540
25%
1822
22%
540
62%
540
34%
980
September11th to 20thNight
54%
540
28%
1980
27%
540
62%
540
36%
1016
September21st to endNight
48%
540
30%
1980
24%
540
60%
540
37%
974
October1st to 10thNight
43%
684
26%
2124
16%
684
51%
684
35%
1218
October11th to 20thNight
34%
720
25%
2160
11%
720
45%
720
33%
1258
October21st to endNight
35%
792
24%
2376
12%
792
46%
792
30%
1438
November1st to 10thNight
41%
857
28%
2337
13%
857
51%
857
40%
1322
November11th to 20thNight
31%
950
26%
2573
9%
950
44%
950
33%
1565
November21st to endNight
33%
950
22%
2660
11%
950
42%
950
31%
1656
December1st to 10thNight
31%
950
19%
2660
8%
950
40%
950
27%
1722
December11th to 20thNight
30%
949
22%
3132
8%
948
40%
948
22%
1920
December21st to endNight
25%
1042
12%
4815
7%
1026
36%
1026
12%
3648

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
12%7%36%5%345%5%7%43%
74644
Night
11%7%35%43445%7%48%
75183
TransparencyDay
40%6%13%25%14%2
74367
Night
37%5%12%26%16%3
74981
SeeingDay
15%9%31%28%15%3
14628
Night
14%9%33%33%11%1
24644

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
10%11%37%6%35%5%5%7%36%
1707
11th to 20thDay
11%9%5%10%6%35%446%37%
1674
21st to endDay
10%11%5%10%7%36%45%7%32%
1782
February1st to 10thDay
10%11%5%9%7%5%5%45%7%33%
1620
11th to 20thDay
10%8%5%8%6%3445%7%39%
1574
21st to endDay
12%8%48%6%44447%39%
1477
March1st to 10thDay
11%10%5%6%5%345%46%42%
1980
11th to 20thDay
15%10%36%5%34447%40%
1980
21st to endDay
20%12%47%6%35%446%30%
2178
April1st to 10thDay
17%7%35%5%24336%44%
2056
11th to 20thDay
17%8%26%6%3445%6%39%
2190
21st to endDay
20%7%25%5%3445%7%38%
2340
May1st to 10thDay
17%7%46%5%35%6%5%8%36%
2340
11th to 20thDay
14%7%36%5%35%5%6%7%39%
2302
21st to endDay
16%8%36%7%35%46%8%35%
2650
June1st to 10thDay
8%435%5%246%7%10%47%
2520
11th to 20thDay
8%4245%45%5%6%9%48%
2520
21st to endDay
8%325%6%46%5%6%8%47%
2520
July1st to 10thDay
8%3244346%7%10%51%
2427
11th to 20thDay
5%4245%345%5%8%54%
2340
21st to endDay
6%425%5%345%7%10%50%
2546
August1st to 10thDay
7%426%7%36%7%7%9%42%
2328
11th to 20thDay
9%4145%35%46%10%48%
2301
21st to endDay
9%435%4345%5%6%51%
2502
September1st to 10thDay
13%423423447%53%
2134
11th to 20thDay
11%5%24434347%54%
1980
21st to endDay
11%42443335%6%55%
1980
October1st to 10thDay
15%5%2432335%7%49%
1818
11th to 20thDay
14%7%24323335%54%
1800
21st to endDay
14%7%35%5%3445%5%46%
1980
November1st to 10thDay
11%42443345%6%55%
1737
11th to 20thDay
11%7%36%5%2445%6%47%
1606
21st to endDay
14%8%45%424449%42%
1520
December1st to 10thDay
9%7%38%5%345%5%7%44%
1520
11th to 20thDay
9%10%48%6%35%5%5%8%36%
1918
21st to endDay
18%11%6%13%7%45%5%45%23%
2797
January1st to 10thNight
8%8%48%7%4446%8%41%
2458
11th to 20thNight
10%10%48%5%3446%7%37%
2425
21st to endNight
12%10%47%5%2445%6%41%
2574
February1st to 10thNight
12%9%47%6%445%46%37%
2340
11th to 20thNight
11%9%36%5%3446%8%42%
2273
21st to endNight
10%7%46%5%34446%46%
1793
March1st to 10thNight
10%8%46%324446%49%
1980
11th to 20thNight
16%8%36%323347%45%
1980
21st to endNight
19%10%36%6%345%6%6%32%
2178
April1st to 10thNight
13%7%345%34447%48%
1902
11th to 20thNight
12%7%26%435%5%46%45%
1717
21st to endNight
16%9%35%433447%43%
1620
May1st to 10thNight
15%6%35%5%345%5%8%40%
1620
11th to 20thNight
13%5%25%435%45%7%46%
1593
21st to endNight
14%6%35%5%3446%7%42%
1621
June1st to 10thNight
6%3233346%6%10%54%
1440
11th to 20thNight
7%41442348%11%52%
1440
21st to endNight
5%3235%245%5%9%56%
1440
July1st to 10thNight
6%4234345%5%8%57%
1528
11th to 20thNight
322242445%10%62%
1620
21st to endNight
43133346%5%11%58%
1772
August1st to 10thNight
6%325%5%345%6%10%52%
1611
11th to 20thNight
7%324423448%58%
1600
21st to endNight
7%42343345%7%59%
1854
September1st to 10thNight
10%424443345%57%
1822
11th to 20thNight
9%5%23423447%57%
1980
21st to endNight
9%413323445%61%
1980
October1st to 10thNight
13%5%24323447%52%
2124
11th to 20thNight
14%6%24323335%54%
2160
21st to endNight
14%6%24424436%51%
2376
November1st to 10thNight
8%42442335%7%57%
2337
11th to 20thNight
11%6%35%42445%6%51%
2573
21st to endNight
13%7%35%323446%50%
2660
December1st to 10thNight
9%8%36%6%35%45%7%45%
2660
11th to 20thNight
10%8%46%5%3345%6%46%
3279
21st to endNight
18%13%8%11%42333429%
4853

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
46%5%16%20%11%1
1708
11th to 20thDay
49%5%13%22%11%
1674
21st to endDay
53%5%15%18%8%
1782
February1st to 10thDay
52%6%12%18%10%1
1620
11th to 20thDay
46%413%22%12%3
1583
21st to endDay
47%413%22%12%2
1477
March1st to 10thDay
44%5%12%24%13%2
1980
11th to 20thDay
46%6%10%24%13%2
1980
21st to endDay
56%5%13%17%8%1
2178
April1st to 10thDay
44%5%11%27%12%2
2056
11th to 20thDay
45%5%13%23%13%2
2190
21st to endDay
47%5%11%23%13%1
2340
May1st to 10thDay
47%7%13%20%13%1
2340
11th to 20thDay
45%7%13%23%12%
2306
21st to endDay
48%7%14%20%10%2
2650
June1st to 10thDay
32%8%16%27%14%2
2520
11th to 20thDay
32%8%14%28%18%1
2520
21st to endDay
34%8%14%27%14%3
2520
July1st to 10thDay
27%7%16%33%14%3
2363
11th to 20thDay
28%7%13%27%19%5%
2271
21st to endDay
28%8%16%31%16%1
2405
August1st to 10thDay
35%9%17%25%12%1
2314
11th to 20thDay
31%7%14%30%17%1
2301
21st to endDay
32%7%10%26%19%5%
2502
September1st to 10thDay
32%6%12%28%18%5%
2134
11th to 20thDay
31%6%10%33%19%1
1980
21st to endDay
30%410%32%23%1
1980
October1st to 10thDay
34%413%27%20%1
1818
11th to 20thDay
33%5%9%25%24%4
1800
21st to endDay
40%5%11%21%19%4
1980
November1st to 10thDay
31%413%29%20%2
1737
11th to 20thDay
39%5%14%24%17%1
1606
21st to endDay
42%5%11%28%13%1
1520
December1st to 10thDay
40%6%16%24%13%1
1520
11th to 20thDay
47%6%16%26%5%
1915
21st to endDay
64%5%9%16%6%
2797
January1st to 10thNight
42%414%22%16%1
2458
11th to 20thNight
46%5%14%26%9%
2425
21st to endNight
45%5%14%23%11%2
2574
February1st to 10thNight
49%5%12%19%12%3
2340
11th to 20thNight
40%5%13%24%15%2
2274
21st to endNight
40%411%22%19%3
1793
March1st to 10thNight
38%5%12%28%16%3
1980
11th to 20thNight
42%5%9%25%16%3
1980
21st to endNight
53%6%13%19%8%2
2178
April1st to 10thNight
38%411%27%17%3
1902
11th to 20thNight
40%5%10%26%16%2
1717
21st to endNight
42%5%11%23%17%1
1620
May1st to 10thNight
43%7%13%22%14%2
1620
11th to 20thNight
39%7%12%24%17%1
1594
21st to endNight
41%8%18%20%11%3
1622
June1st to 10thNight
25%7%16%32%17%3
1440
11th to 20thNight
25%8%15%28%20%4
1440
21st to endNight
24%7%15%31%19%4
1440
July1st to 10thNight
25%7%15%30%19%4
1484
11th to 20thNight
19%7%17%32%20%5%
1566
21st to endNight
20%6%15%35%21%3
1673
August1st to 10thNight
28%7%17%31%15%1
1601
11th to 20thNight
26%6%13%33%20%3
1600
21st to endNight
25%6%13%27%21%10%
1854
September1st to 10thNight
29%5%11%26%21%7%
1822
11th to 20thNight
27%5%11%34%20%3
1980
21st to endNight
27%39%30%27%3
1980
October1st to 10thNight
33%410%27%23%3
2124
11th to 20thNight
34%48%24%25%6%
2160
21st to endNight
36%5%12%21%24%3
2376
November1st to 10thNight
27%5%16%24%24%4
2337
11th to 20thNight
33%5%11%30%18%2
2573
21st to endNight
37%412%27%18%2
2660
December1st to 10thNight
40%5%12%30%12%1
2660
11th to 20thNight
39%5%14%33%9%
3281
21st to endNight
60%5%9%18%7%1
4853

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
21%14%32%24%7%1
270
11th to 20thDay
21%15%38%20%6%1
258
21st to endDay
15%11%47%25%3
264
February1st to 10thDay
18%16%45%18%3
240
11th to 20thDay
19%17%40%18%5%1
240
21st to endDay
17%14%46%19%4
198
March1st to 10thDay
18%15%43%19%41
240
11th to 20thDay
30%10%35%18%6%1
240
21st to endDay
30%17%35%13%31
264
April1st to 10thDay
24%16%38%17%4
316
11th to 20thDay
21%15%35%22%7%
468
21st to endDay
22%13%35%22%8%2
600
May1st to 10thDay
19%13%33%24%10%1
603
11th to 20thDay
18%9%33%25%12%3
625
21st to endDay
20%6%29%28%15%2
679
June1st to 10thDay
7%6%23%33%24%7%
630
11th to 20thDay
8%5%30%35%18%4
630
21st to endDay
7%6%35%32%17%3
630
July1st to 10thDay
9%316%33%29%10%
621
11th to 20thDay
6%224%38%24%6%
618
21st to endDay
7%218%44%26%4
684
August1st to 10thDay
8%219%38%27%5%
626
11th to 20thDay
11%417%39%25%4
615
21st to endDay
10%320%36%25%6%
621
September1st to 10thDay
13%428%30%20%4
424
11th to 20thDay
6%433%31%19%7%
270
21st to endDay
14%8%34%24%18%1
270
October1st to 10thDay
23%7%24%25%14%6%
270
11th to 20thDay
11%19%42%21%6%1
270
21st to endDay
19%17%35%19%8%3
297
November1st to 10thDay
14%12%41%21%9%2
270
11th to 20thDay
17%14%40%19%9%
270
21st to endDay
24%10%36%21%7%1
270
December1st to 10thDay
9%17%37%28%7%2
270
11th to 20thDay
16%15%34%26%9%
270
21st to endDay
21%13%44%19%2
297
January1st to 10thNight
12%13%36%32%7%
950
11th to 20thNight
15%13%36%30%7%1
933
21st to endNight
18%10%38%29%5%
990
February1st to 10thNight
16%11%38%31%4
900
11th to 20thNight
14%12%41%28%5%
879
21st to endNight
14%12%45%22%6%1
609
March1st to 10thNight
14%14%39%26%7%1
540
11th to 20thNight
20%8%36%29%6%1
540
21st to endNight
23%13%37%21%6%1
594
April1st to 10thNight
15%15%40%24%5%
540
11th to 20thNight
17%13%41%26%41
533
21st to endNight
19%9%38%26%8%
540
May1st to 10thNight
17%9%33%33%8%1
540
11th to 20thNight
16%8%32%34%9%1
531
21st to endNight
15%7%30%34%14%
584
June1st to 10thNight
6%426%44%20%
540
11th to 20thNight
7%332%42%16%
540
21st to endNight
5%433%43%15%
540
July1st to 10thNight
7%216%42%31%2
525
11th to 20thNight
3219%49%25%2
522
21st to endNight
5%115%53%25%1
591
August1st to 10thNight
6%218%49%23%2
537
11th to 20thNight
9%316%47%24%1
534
21st to endNight
7%221%41%27%2
594
September1st to 10thNight
10%425%35%23%3
540
11th to 20thNight
11%328%36%20%2
540
21st to endNight
11%6%32%35%15%1
540
October1st to 10thNight
16%5%32%33%11%2
684
11th to 20thNight
17%9%37%30%8%
720
21st to endNight
18%11%33%30%8%
792
November1st to 10thNight
10%12%34%35%9%
857
11th to 20thNight
14%12%39%29%6%
950
21st to endNight
17%10%36%29%8%
950
December1st to 10thNight
14%12%36%31%6%
950
11th to 20thNight
17%9%35%32%7%1
950
21st to endNight
19%13%36%27%4
1045
Page generated at 2024-01-13 22:56:38. Version ac07

Copyright 2024 Attilla Danko


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