Keoma Public Fields
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Keoma Public Fields clear sky chart from 2005-11-05 to 2018-04-23.

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
42%
16123
13%
49584
9%
16095
47%
16095
21%
34076

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
34%
971
11%
2910
7%
970
37%
970
15%
2197
January16th to endNight
36%
903
18%
2983
12%
903
44%
903
20%
1997
February1st to 15thNight
43%
758
12%
2613
12%
756
47%
756
17%
1801
February16th to endNight
41%
684
13%
2153
12%
684
45%
684
19%
1538
March1st to 15thNight
39%
780
14%
2285
10%
780
44%
780
20%
1632
March16th to endNight
33%
832
10%
2272
4%
831
37%
831
17%
1741
April1st to 15thNight
34%
669
10%
1839
5%
669
38%
669
18%
1397
April16th to endNight
39%
558
12%
1674
9%
558
43%
558
21%
1179
May1st to 15thNight
42%
428
11%
1410
10%
428
47%
428
22%
916
May16th to endNight
44%
374
4%
1309
2%
374
45%
374
16%
935
June1st to 15thNight
38%
360
0%
1260
0%
360
38%
360
14%
917
June16th to endNight
51%
360
0%
1260
0%
360
51%
360
19%
841
July1st to 15thNight
61%
340
1%
1190
0%
340
61%
340
24%
738
July16th to endNight
64%
376
9%
1264
10%
354
66%
354
29%
710
August1st to 15thNight
64%
407
9%
1479
12%
405
65%
405
24%
892
August16th to endNight
62%
573
20%
1719
15%
573
65%
573
38%
964
September1st to 15thNight
54%
650
16%
1805
12%
650
56%
650
33%
1139
September16th to endNight
55%
716
20%
1980
13%
716
60%
716
36%
1206
October1st to 15thNight
45%
720
16%
2120
10%
720
50%
720
22%
1429
October16th to endNight
44%
768
18%
2496
13%
768
52%
768
24%
1612
November1st to 15thNight
37%
906
17%
2616
10%
906
43%
906
22%
1817
November16th to endNight
34%
975
14%
2902
8%
975
40%
975
20%
2038
December1st to 15thNight
38%
975
12%
2925
9%
975
41%
975
17%
2149
December16th to endNight
39%
1040
15%
3120
9%
1040
44%
1040
17%
2291

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
10%8%36%6%35%5%6%8%34%
49971
Night
7%9%47%6%35%5%6%8%34%
49735
TransparencyDay
45%8%16%20%7%1
49624
Night
45%7%15%20%8%1
49586
SeeingDay
14%6%25%29%18%5%
6666
Night
11%428%36%16%2
16135

By Month

Percentage Cloud Cover NW (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
8%10%5%7%7%25%6%5%9%31%
1358
16th to endDay
7%10%47%7%46%5%6%7%31%
1602
February1st to 15thDay
8%11%5%8%7%25%46%7%30%
1580
16th to endDay
411%6%10%8%46%5%6%7%28%
1606
March1st to 15thDay
5%11%5%8%8%46%5%6%7%29%
2005
16th to endDay
10%15%5%7%7%35%46%7%25%
2300
April1st to 15thDay
11%14%5%8%6%36%6%5%7%24%
2439
16th to endDay
14%10%47%5%45%45%7%29%
2400
May1st to 15thDay
11%8%37%5%35%6%6%8%34%
2540
16th to endDay
19%7%36%5%36%5%6%8%27%
2802
June1st to 15thDay
17%7%37%6%36%6%6%8%26%
2700
16th to endDay
12%6%36%6%46%5%6%10%32%
2700
July1st to 15thDay
9%425%5%35%5%7%10%40%
2700
16th to endDay
6%2145%25%6%7%10%47%
2819
August1st to 15thDay
11%5%235%345%6%8%41%
2472
16th to endDay
8%3234245%6%9%48%
2483
September1st to 15thDay
13%6%24423345%48%
2154
16th to endDay
8%7%35%434448%44%
1980
October1st to 15thDay
14%8%37%5%25%45%6%35%
1837
16th to endDay
7%9%36%5%35%5%6%8%37%
1728
November1st to 15thDay
8%12%5%6%8%45%45%6%31%
1558
16th to endDay
6%11%5%7%5%345%7%8%33%
1387
December1st to 15thDay
6%12%6%11%6%47%6%46%27%
1365
16th to endDay
411%411%7%37%6%6%9%26%
1456
January1st to 15thNight
5%12%5%9%9%46%6%6%8%24%
2910
16th to endNight
5%11%48%6%35%5%6%9%32%
2983
February1st to 15thNight
6%10%5%8%7%46%5%5%7%32%
2602
16th to endNight
410%6%9%8%5%5%5%5%9%28%
2153
March1st to 15thNight
5%10%5%8%7%46%5%7%9%30%
2285
16th to endNight
7%14%7%8%6%46%6%6%7%25%
2271
April1st to 15thNight
11%11%48%7%47%5%6%8%24%
1839
16th to endNight
12%10%45%5%45%5%6%8%32%
1674
May1st to 15thNight
10%9%46%5%245%6%7%37%
1409
16th to endNight
18%6%25%5%37%5%6%7%30%
1309
June1st to 15thNight
16%8%46%6%46%6%5%6%27%
1260
16th to endNight
11%5%35%5%36%6%7%8%36%
1260
July1st to 15thNight
6%4245%35%8%7%9%40%
1260
16th to endNight
5%3245%245%6%9%49%
1350
August1st to 15thNight
10%5%245%25%5%6%10%42%
1487
16th to endNight
7%4133235%6%8%52%
1719
September1st to 15thNight
11%6%15%42335%7%47%
1805
16th to endNight
9%5%1333445%8%49%
1980
October1st to 15thNight
10%8%37%5%345%5%8%36%
2120
16th to endNight
7%8%36%4345%6%10%38%
2496
November1st to 15thNight
6%10%47%6%36%45%8%35%
2616
16th to endNight
5%12%5%8%6%45%46%8%33%
2902
December1st to 15thNight
5%10%5%11%7%45%6%6%7%30%
2925
16th to endNight
412%5%10%9%5%6%5%5%7%28%
3120

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
48%8%14%21%5%1
1358
16th to endDay
49%6%15%15%9%3
1602
February1st to 15thDay
51%7%15%16%7%1
1580
16th to endDay
52%6%13%18%7%
1606
March1st to 15thDay
50%8%18%15%6%1
2005
16th to endDay
55%8%14%16%5%
2301
April1st to 15thDay
57%7%14%13%6%1
2439
16th to endDay
52%7%13%17%8%1
2400
May1st to 15thDay
45%7%15%21%9%
2540
16th to endDay
52%8%15%17%4
2807
June1st to 15thDay
51%9%14%17%5%1
2700
16th to endDay
45%8%18%22%4
2700
July1st to 15thDay
36%11%22%22%6%
2541
16th to endDay
29%9%23%27%9%
2642
August1st to 15thDay
37%9%24%22%6%
2455
16th to endDay
30%7%21%28%10%1
2483
September1st to 15thDay
37%5%14%22%14%4
2154
16th to endDay
37%7%13%27%11%2
1980
October1st to 15thDay
47%6%15%21%7%
1837
16th to endDay
42%8%15%24%9%
1728
November1st to 15thDay
51%8%12%19%6%1
1558
16th to endDay
45%7%16%21%7%1
1387
December1st to 15thDay
55%7%13%15%6%1
1365
16th to endDay
50%8%14%15%9%
1456
January1st to 15thNight
54%8%12%16%5%2
2910
16th to endNight
45%6%14%18%11%3
2983
February1st to 15thNight
48%7%13%18%9%1
2613
16th to endNight
50%6%12%18%11%
2153
March1st to 15thNight
47%8%16%19%6%
2285
16th to endNight
55%7%13%16%6%
2274
April1st to 15thNight
55%6%14%14%8%
1839
16th to endNight
48%6%14%21%7%1
1674
May1st to 15thNight
43%6%14%23%11%
1410
16th to endNight
49%9%17%15%5%1
1309
June1st to 15thNight
53%8%12%17%6%1
1260
16th to endNight
42%11%18%21%6%
1260
July1st to 15thNight
35%11%22%23%6%
1190
16th to endNight
29%10%18%31%9%1
1264
August1st to 15thNight
34%10%21%25%7%
1479
16th to endNight
27%7%18%31%12%3
1719
September1st to 15thNight
35%6%14%22%15%5%
1805
16th to endNight
32%6%17%25%14%4
1980
October1st to 15thNight
44%7%14%22%9%1
2120
16th to endNight
39%9%17%23%9%
2496
November1st to 15thNight
45%7%14%20%11%1
2616
16th to endNight
47%8%16%17%7%2
2902
December1st to 15thNight
52%8%13%19%5%1
2925
16th to endNight
53%6%12%20%7%
3120

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
13%5%13%34%15%17%
90
16th to endDay
8%5%23%32%21%8%
96
February1st to 15thDay
18%9%21%35%12%2
105
16th to endDay
8%433%34%17%1
187
March1st to 15thDay
11%9%35%30%8%4
330
16th to endDay
15%12%38%19%11%2
352
April1st to 15thDay
18%11%32%23%13%1
329
16th to endDay
21%10%25%28%13%2
288
May1st to 15thDay
15%8%25%24%21%4
387
16th to endDay
22%5%19%28%21%4
517
June1st to 15thDay
16%6%25%32%16%2
495
16th to endDay
14%5%25%30%19%4
495
July1st to 15thDay
12%218%33%26%6%
475
16th to endDay
7%425%34%21%5%
488
August1st to 15thDay
13%315%31%26%8%
315
16th to endDay
8%7%20%32%23%8%
332
September1st to 15thDay
23%5%20%24%19%6%
315
16th to endDay
12%9%23%28%18%7%
315
October1st to 15thDay
22%8%20%28%14%5%
196
16th to endDay
13%6%27%33%17%2
144
November1st to 15thDay
20%6%28%27%11%6%
135
16th to endDay
9%7%34%25%12%10%
94
December1st to 15thDay
7%5%34%26%21%4
90
16th to endDay
13%331%26%19%6%
96
January1st to 15thNight
11%7%31%33%13%1
975
16th to endNight
10%6%34%35%11%1
903
February1st to 15thNight
10%7%25%35%16%3
764
16th to endNight
8%329%38%17%3
684
March1st to 15thNight
8%433%33%16%2
780
16th to endNight
13%431%35%12%1
832
April1st to 15thNight
14%5%31%33%13%1
669
16th to endNight
17%5%28%35%13%
558
May1st to 15thNight
14%5%27%34%16%
429
16th to endNight
21%421%30%20%1
375
June1st to 15thNight
18%6%25%31%15%2
360
16th to endNight
15%223%36%18%1
360
July1st to 15thNight
10%217%39%29%2
340
16th to endNight
5%218%47%23%1
376
August1st to 15thNight
12%210%40%31%2
407
16th to endNight
9%219%40%28%
573
September1st to 15thNight
14%222%32%25%3
650
16th to endNight
10%226%37%20%2
716
October1st to 15thNight
16%325%34%16%3
720
16th to endNight
11%331%39%12%1
768
November1st to 15thNight
10%8%35%33%11%2
906
16th to endNight
11%5%37%33%9%1
975
December1st to 15thNight
9%5%31%37%14%1
975
16th to endNight
10%429%39%12%3
1040
Page generated at 2018-04-24 08:03:00. Version ac04

Copyright 2018 A. Danko


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