Gipe Farm
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Gipe Farm clear sky chart from 2005-11-05 to 2017-10-31.

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
41%
16141
21%
47462
12%
16094
49%
16094
30%
29017

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 15thNight
35%
900
20%
2327
9%
895
44%
895
30%
1506
January16th to endNight
29%
960
23%
2496
9%
960
39%
960
28%
1649
February1st to 15thNight
28%
880
13%
2288
5%
876
33%
876
22%
1645
February16th to endNight
28%
702
23%
1964
7%
702
41%
702
32%
1224
March1st to 15thNight
35%
540
22%
1980
15%
540
46%
540
26%
1138
March16th to endNight
27%
576
15%
2112
11%
576
36%
576
18%
1389
April1st to 15thNight
30%
539
20%
1864
13%
539
43%
539
24%
1130
April16th to endNight
31%
540
21%
1638
14%
540
43%
540
24%
1071
May1st to 15thNight
37%
540
18%
1620
14%
540
44%
540
25%
1053
May16th to endNight
41%
563
17%
1601
9%
561
48%
561
28%
1028
June1st to 15thNight
53%
540
18%
1440
8%
540
57%
540
40%
854
June16th to endNight
58%
540
23%
1440
10%
540
62%
540
49%
785
July1st to 15thNight
67%
510
17%
1470
10%
510
69%
510
42%
815
July16th to endNight
75%
564
24%
1594
20%
531
78%
531
49%
803
August1st to 15thNight
69%
539
22%
1610
24%
536
71%
536
42%
879
August16th to endNight
61%
573
26%
1767
26%
573
66%
573
36%
995
September1st to 15thNight
56%
540
24%
1875
22%
540
63%
540
32%
1035
September16th to endNight
50%
537
29%
1980
24%
537
62%
537
35%
1010
October1st to 15thNight
38%
696
26%
2136
15%
696
47%
696
32%
1265
October16th to endNight
40%
768
27%
2304
13%
768
51%
768
34%
1318
November1st to 15thNight
42%
834
28%
2239
13%
834
51%
834
39%
1288
November16th to endNight
32%
900
21%
2520
10%
900
41%
900
31%
1564
December1st to 15thNight
28%
900
16%
2520
7%
900
36%
900
24%
1708
December16th to endNight
30%
960
19%
2677
7%
960
39%
960
22%
1865

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%6%25%424447%43%
48279
Night
10%6%24423447%48%
47656
Cloud CoverDay
12%6%25%5%2445%7%43%
48277
Night
10%6%24423447%48%
47656
TransparencyDay
40%5%13%24%13%1
47977
Night
35%5%13%26%16%2
47462
SeeingDay
13%6%29%30%16%3
6123
Night
13%8%32%33%12%
16141

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 15thDay
9%7%37%6%35%446%41%
1611
16th to endDay
11%11%38%5%24447%36%
1728
February1st to 15thDay
11%8%6%8%6%3435%7%34%
1575
16th to endDay
12%8%46%5%35%447%39%
1518
March1st to 15thDay
11%8%46%434446%40%
1980
16th to endDay
18%9%35%5%24347%34%
2112
April1st to 15thDay
16%7%35%5%2343442%
2082
16th to endDay
23%7%25%5%23447%34%
2319
May1st to 15thDay
15%6%35%425%5%46%38%
2331
16th to endDay
16%5%26%5%3445%8%38%
2511
June1st to 15thDay
10%5%25%4335%5%7%45%
2520
16th to endDay
6%2146%35%5%5%9%48%
2520
July1st to 15thDay
8%4143245%6%8%48%
2397
16th to endDay
43144235%6%9%53%
2466
August1st to 15thDay
6%415%5%36%6%6%9%43%
2340
16th to endDay
10%4143245%47%48%
2435
September1st to 15thDay
12%5%13423347%51%
2082
16th to endDay
10%323433346%54%
1980
October1st to 15thDay
16%5%15%312346%48%
1812
16th to endDay
13%7%2442443449%
1919
November1st to 15thDay
9%423314346%56%
1616
16th to endDay
14%8%35%423347%42%
1440
December1st to 15thDay
11%10%38%5%2445%6%35%
1440
16th to endDay
14%10%48%6%35%337%31%
1545
January1st to 15thNight
7%7%25%5%245%5%8%43%
2327
16th to endNight
10%9%36%424345%46%
2496
February1st to 15thNight
12%8%5%6%5%34446%36%
2278
16th to endNight
9%6%35%41345%6%48%
1964
March1st to 15thNight
10%7%35%323347%49%
1980
16th to endNight
16%9%25%42345%6%37%
2112
April1st to 15thNight
13%6%34423445%46%
1864
16th to endNight
16%7%36%322345%42%
1638
May1st to 15thNight
14%435%434446%42%
1619
16th to endNight
13%5%24424447%46%
1599
June1st to 15thNight
7%41332446%10%51%
1440
16th to endNight
311332347%8%59%
1440
July1st to 15thNight
42124245%5%8%56%
1559
16th to endNight
31124244410%60%
1702
August1st to 15thNight
42234245%6%10%54%
1620
16th to endNight
9%324422446%56%
1767
September1st to 15thNight
10%424424346%54%
1875
16th to endNight
9%413313446%57%
1980
October1st to 15thNight
14%5%24323235%51%
2136
16th to endNight
11%5%13323435%55%
2304
November1st to 15thNight
8%41332335%7%56%
2239
16th to endNight
12%6%23423445%50%
2520
December1st to 15thNight
13%9%25%5%2435%7%40%
2520
16th to endNight
14%8%46%423447%38%
2677

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 15thDay
9%7%27%6%34447%41%
1611
16th to endDay
11%11%48%5%25%35%7%35%
1728
February1st to 15thDay
11%9%49%6%34447%34%
1575
16th to endDay
11%8%47%434446%39%
1518
March1st to 15thDay
11%9%45%4345%46%40%
1980
16th to endDay
18%9%35%5%24446%34%
2110
April1st to 15thDay
16%7%26%5%2433442%
2082
16th to endDay
22%7%25%5%23347%34%
2319
May1st to 15thDay
15%7%35%425%5%47%37%
2331
16th to endDay
15%5%25%6%3446%7%38%
2511
June1st to 15thDay
10%5%35%4345%5%8%44%
2520
16th to endDay
6%2145%35%5%6%8%48%
2520
July1st to 15thDay
8%3234346%6%9%48%
2397
16th to endDay
42144245%6%9%53%
2466
August1st to 15thDay
6%415%6%35%6%7%9%43%
2340
16th to endDay
10%4244345%5%8%47%
2435
September1st to 15thDay
11%5%23423447%50%
2082
16th to endDay
9%323323346%54%
1980
October1st to 15thDay
15%5%1431335%6%48%
1812
16th to endDay
13%6%33424345%49%
1919
November1st to 15thDay
9%413323346%56%
1616
16th to endDay
14%8%45%413347%41%
1440
December1st to 15thDay
11%10%48%5%34447%35%
1440
16th to endDay
14%10%48%6%35%436%31%
1545
January1st to 15thNight
7%6%25%5%3446%8%43%
2327
16th to endNight
10%9%46%424345%46%
2496
February1st to 15thNight
12%9%47%6%44446%37%
2278
16th to endNight
9%6%35%42345%6%48%
1964
March1st to 15thNight
10%7%35%214347%49%
1980
16th to endNight
16%8%35%5%2345%7%37%
2112
April1st to 15thNight
13%6%24424435%46%
1864
16th to endNight
16%7%36%422346%42%
1638
May1st to 15thNight
13%5%35%5%34447%42%
1619
16th to endNight
12%5%2442445%7%46%
1599
June1st to 15thNight
8%42332446%9%51%
1440
16th to endNight
32134235%7%10%57%
1440
July1st to 15thNight
42123245%5%9%56%
1559
16th to endNight
31124235%410%60%
1702
August1st to 15thNight
421442446%10%54%
1620
16th to endNight
8%324423346%56%
1767
September1st to 15thNight
10%424423336%54%
1875
16th to endNight
9%413323346%57%
1980
October1st to 15thNight
14%5%24322236%51%
2136
16th to endNight
12%423323436%54%
2304
November1st to 15thNight
8%5%2332335%7%56%
2239
16th to endNight
12%6%24323445%49%
2520
December1st to 15thNight
13%9%35%42435%7%40%
2520
16th to endNight
14%8%46%42345%6%38%
2677

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 15thDay
42%418%22%11%
1612
16th to endDay
48%5%16%19%9%
1728
February1st to 15thDay
50%5%14%21%7%
1576
16th to endDay
46%5%13%20%11%2
1518
March1st to 15thDay
45%6%12%23%11%1
1980
16th to endDay
51%6%13%21%7%1
2112
April1st to 15thDay
46%411%26%10%1
2082
16th to endDay
50%412%20%10%
2319
May1st to 15thDay
46%6%12%21%12%
2331
16th to endDay
45%5%14%22%10%
2515
June1st to 15thDay
38%6%14%24%14%2
2520
16th to endDay
31%7%15%28%14%2
2520
July1st to 15thDay
32%6%15%29%13%3
2258
16th to endDay
24%8%16%30%17%2
2311
August1st to 15thDay
33%8%16%25%15%1
2326
16th to endDay
34%6%11%24%17%4
2435
September1st to 15thDay
33%6%11%26%18%3
2082
16th to endDay
30%412%32%19%
1980
October1st to 15thDay
36%411%25%20%1
1812
16th to endDay
38%410%23%19%3
1919
November1st to 15thDay
29%313%29%21%2
1616
16th to endDay
43%413%27%10%
1440
December1st to 15thDay
48%6%16%20%8%
1440
16th to endDay
53%6%12%17%9%
1545
January1st to 15thNight
37%5%16%25%14%
2327
16th to endNight
40%415%26%12%
2496
February1st to 15thNight
49%413%21%9%1
2288
16th to endNight
36%314%23%18%2
1964
March1st to 15thNight
35%5%12%27%16%2
1980
16th to endNight
46%5%13%23%8%1
2112
April1st to 15thNight
39%39%28%16%1
1864
16th to endNight
43%412%22%14%1
1638
May1st to 15thNight
41%5%11%23%16%1
1620
16th to endNight
37%7%15%22%14%2
1601
June1st to 15thNight
28%6%16%28%17%3
1440
16th to endNight
20%7%14%32%21%3
1440
July1st to 15thNight
23%7%16%30%16%4
1470
16th to endNight
19%5%14%36%20%2
1594
August1st to 15thNight
25%6%17%31%16%2
1610
16th to endNight
29%5%10%26%19%8%
1767
September1st to 15thNight
32%411%25%20%5%
1875
16th to endNight
28%410%33%21%2
1980
October1st to 15thNight
35%39%23%24%3
2136
16th to endNight
31%411%25%24%2
2304
November1st to 15thNight
28%414%24%25%4
2239
16th to endNight
35%413%27%16%1
2520
December1st to 15thNight
44%415%25%9%
2520
16th to endNight
46%6%14%21%10%1
2677

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 15thDay
24%6%36%25%6%
90
16th to endDay
21%5%42%26%4
96
February1st to 15thDay
15%11%47%22%3
90
16th to endDay
14%12%44%18%8%1
81
March1st to 15thDay
22%12%47%16%1
90
16th to endDay
28%7%42%15%6%
96
April1st to 15thDay
19%11%35%24%7%
201
16th to endDay
27%12%32%20%7%
429
May1st to 15thDay
17%10%31%25%12%1
468
16th to endDay
18%5%35%28%11%1
517
June1st to 15thDay
10%5%27%32%19%4
495
16th to endDay
5%5%32%33%19%3
495
July1st to 15thDay
9%222%34%24%6%
475
16th to endDay
3117%44%30%4
515
August1st to 15thDay
7%117%38%30%5%
493
16th to endDay
13%318%32%23%7%
475
September1st to 15thDay
7%327%32%21%7%
237
16th to endDay
10%238%27%19%1
135
October1st to 15thDay
20%7%32%26%7%5%
135
16th to endDay
13%13%36%28%8%
144
November1st to 15thDay
7%432%32%18%4
90
16th to endDay
42%10%37%7%2
90
December1st to 15thDay
14%23%41%14%33
90
16th to endDay
27%21%32%16%2
96
January1st to 15thNight
11%13%34%33%6%
900
16th to endNight
15%9%37%30%6%
960
February1st to 15thNight
16%10%36%30%5%
880
16th to endNight
11%10%44%25%6%
702
March1st to 15thNight
13%11%34%30%9%
540
16th to endNight
20%10%38%23%6%
576
April1st to 15thNight
15%12%38%28%5%
539
16th to endNight
19%8%37%25%9%
540
May1st to 15thNight
15%8%32%32%9%
540
16th to endNight
14%5%33%34%12%
563
June1st to 15thNight
8%427%42%15%
540
16th to endNight
3330%44%18%
540
July1st to 15thNight
5%120%42%28%1
510
16th to endNight
3113%51%29%
564
August1st to 15thNight
5%116%51%24%1
539
16th to endNight
10%118%38%28%2
573
September1st to 15thNight
10%325%32%25%3
540
16th to endNight
11%429%33%19%1
537
October1st to 15thNight
18%5%32%30%10%2
696
16th to endNight
14%9%33%33%8%
768
November1st to 15thNight
11%10%32%35%10%
834
16th to endNight
15%10%37%27%7%
900
December1st to 15thNight
20%11%35%27%5%
900
16th to endNight
18%9%33%31%6%
960
Page generated at 2017-11-01 16:23:38. Version ac04

Copyright 2017 A. Danko


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