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 2017-09-16.

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
42%
15187
12%
46770
9%
15159
47%
15159
21%
32176

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
31%
896
11%
2685
7%
895
34%
895
14%
2047
January16th to endNight
36%
834
17%
2754
11%
834
44%
834
19%
1862
February1st to 15thNight
43%
698
12%
2408
11%
696
48%
696
17%
1647
February16th to endNight
41%
632
13%
1989
12%
632
46%
632
18%
1430
March1st to 15thNight
36%
720
12%
2109
8%
720
41%
720
19%
1535
March16th to endNight
34%
768
10%
2097
3%
767
38%
767
17%
1596
April1st to 15thNight
34%
617
10%
1697
5%
617
38%
617
18%
1284
April16th to endNight
39%
540
12%
1620
9%
540
43%
540
20%
1142
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
54%
656
19%
1816
13%
656
60%
656
37%
1098
October1st to 15thNight
45%
660
16%
1943
10%
660
51%
660
22%
1315
October16th to endNight
44%
704
17%
2288
12%
704
52%
704
23%
1490
November1st to 15thNight
37%
834
17%
2409
11%
834
43%
834
23%
1642
November16th to endNight
34%
900
14%
2679
8%
900
39%
900
20%
1894
December1st to 15thNight
36%
900
11%
2700
8%
900
39%
900
16%
2036
December16th to endNight
39%
960
15%
2880
9%
960
44%
960
18%
2106

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%
48011
Night
8%9%47%6%35%5%6%8%34%
46921
TransparencyDay
45%8%16%20%7%1
47664
Night
45%7%15%20%8%1
46772
SeeingDay
14%6%25%29%18%4
6028
Night
12%428%35%16%2
15199

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%11%5%7%7%25%6%5%8%32%
1253
16th to endDay
8%10%5%7%6%46%5%6%7%31%
1479
February1st to 15thDay
7%11%5%7%8%25%46%7%31%
1455
16th to endDay
5%12%6%10%7%46%5%5%7%27%
1484
March1st to 15thDay
5%11%5%9%8%46%5%6%7%29%
1851
16th to endDay
10%14%5%7%7%35%46%7%25%
2123
April1st to 15thDay
11%14%5%8%5%36%6%5%7%25%
2251
16th to endDay
14%10%47%5%45%45%7%29%
2340
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
9%7%25%434448%44%
1816
October1st to 15thDay
15%7%37%5%25%46%6%35%
1684
16th to endDay
7%9%36%5%45%5%6%8%37%
1584
November1st to 15thDay
8%11%5%6%8%45%45%7%33%
1436
16th to endDay
6%12%5%7%5%335%7%8%33%
1281
December1st to 15thDay
6%13%6%12%6%47%6%5%6%24%
1260
16th to endDay
411%410%7%37%6%6%9%27%
1344
January1st to 15thNight
5%12%5%9%9%46%6%6%7%24%
2685
16th to endNight
5%11%48%6%35%5%6%9%32%
2754
February1st to 15thNight
6%10%5%8%6%45%5%5%7%33%
2397
16th to endNight
5%10%6%9%8%5%5%5%5%9%27%
1989
March1st to 15thNight
410%6%8%7%46%5%7%9%28%
2109
16th to endNight
7%13%7%8%6%46%6%6%7%25%
2096
April1st to 15thNight
11%11%47%7%47%5%7%8%24%
1697
16th to endNight
12%10%45%5%445%6%8%32%
1620
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%1333446%8%49%
1816
October1st to 15thNight
11%8%37%5%345%6%8%36%
1943
16th to endNight
8%8%35%5%345%6%9%38%
2288
November1st to 15thNight
7%9%46%6%36%45%8%37%
2409
16th to endNight
5%12%5%8%7%3445%8%32%
2679
December1st to 15thNight
5%11%6%11%8%45%6%6%7%27%
2700
16th to endNight
411%5%10%9%46%5%5%7%29%
2880

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%7%14%22%5%1
1253
16th to endDay
49%6%15%15%9%3
1479
February1st to 15thDay
49%7%16%17%7%1
1455
16th to endDay
53%6%14%17%7%
1484
March1st to 15thDay
50%8%18%15%6%
1851
16th to endDay
55%8%14%17%4
2124
April1st to 15thDay
56%7%14%13%6%1
2251
16th to endDay
52%7%13%17%8%1
2340
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%28%10%3
1816
October1st to 15thDay
46%6%16%21%7%
1684
16th to endDay
42%8%14%24%8%
1584
November1st to 15thDay
49%7%13%20%7%1
1436
16th to endDay
46%7%16%20%7%1
1281
December1st to 15thDay
57%7%13%14%5%
1260
16th to endDay
48%9%15%15%9%1
1344
January1st to 15thNight
55%8%11%15%5%2
2685
16th to endNight
46%7%14%18%10%3
2754
February1st to 15thNight
48%7%14%19%8%1
2408
16th to endNight
51%6%12%17%11%
1989
March1st to 15thNight
49%8%16%18%5%
2109
16th to endNight
54%7%14%16%6%
2099
April1st to 15thNight
54%6%14%14%8%
1697
16th to endNight
48%6%14%21%7%1
1620
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
31%6%17%25%14%4
1816
October1st to 15thNight
44%7%14%22%8%1
1943
16th to endNight
39%9%17%23%8%
2288
November1st to 15thNight
43%7%14%21%11%1
2409
16th to endNight
48%7%16%16%8%2
2679
December1st to 15thNight
54%8%13%17%4
2700
16th to endNight
52%6%12%20%6%
2880

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
16%5%15%28%15%20%
60
16th to endDay
10%6%25%21%23%12%
64
February1st to 15thDay
14%11%21%34%17%1
70
16th to endDay
11%5%34%34%13%
143
March1st to 15thDay
10%11%41%31%4
270
16th to endDay
12%13%40%21%10%2
288
April1st to 15thDay
18%12%31%23%12%
269
16th to endDay
20%10%25%28%13%2
270
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%10%25%32%15%4
256
October1st to 15thDay
21%9%19%30%15%4
146
16th to endDay
13%318%37%23%3
96
November1st to 15thDay
23%330%28%10%4
90
16th to endDay
9%7%25%22%19%15%
63
December1st to 15thDay
8%5%36%30%20%
60
16th to endDay
10%326%26%23%9%
64
January1st to 15thNight
11%8%33%32%13%1
900
16th to endNight
10%5%34%35%12%1
834
February1st to 15thNight
10%7%24%35%17%3
704
16th to endNight
8%329%37%16%3
632
March1st to 15thNight
8%5%35%34%14%1
720
16th to endNight
13%431%36%11%1
768
April1st to 15thNight
14%5%32%31%13%1
617
16th to endNight
17%428%35%12%
540
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%227%38%18%2
656
October1st to 15thNight
16%325%35%16%3
660
16th to endNight
12%329%40%13%1
704
November1st to 15thNight
10%7%36%32%10%2
834
16th to endNight
11%5%37%33%10%2
900
December1st to 15thNight
9%5%32%36%13%2
900
16th to endNight
10%429%38%13%3
960
Page generated at 2017-09-16 15:07:01. Version ac04

Copyright 2017 A. Danko


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