Gates of Lodore
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Gates of Lodore clear sky chart from 2005-11-05 to 2017-09-20.

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
60%
15959
22%
46946
18%
15917
63%
15917
34%
27594

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
52%
799
18%
2407
15%
796
55%
796
28%
1498
January16th to endNight
53%
768
21%
2496
19%
768
59%
768
27%
1522
February1st to 15thNight
54%
697
16%
2288
15%
696
58%
696
27%
1388
February16th to endNight
49%
632
19%
1972
14%
632
56%
632
27%
1238
March1st to 15thNight
59%
720
20%
1980
16%
720
62%
720
35%
1203
March16th to endNight
52%
768
19%
2112
12%
768
57%
768
32%
1350
April1st to 15thNight
43%
558
16%
1817
11%
558
49%
558
24%
1122
April16th to endNight
47%
540
19%
1718
14%
540
52%
540
26%
1048
May1st to 15thNight
52%
540
20%
1620
16%
540
55%
540
28%
996
May16th to endNight
59%
563
21%
1511
16%
561
62%
561
33%
933
June1st to 15thNight
62%
540
22%
1440
17%
540
65%
540
44%
800
June16th to endNight
73%
540
30%
1440
25%
540
77%
540
59%
712
July1st to 15thNight
77%
510
19%
1376
17%
510
79%
510
45%
784
July16th to endNight
84%
564
24%
1593
24%
531
83%
531
47%
811
August1st to 15thNight
77%
539
23%
1611
22%
536
78%
536
45%
836
August16th to endNight
80%
573
34%
1821
34%
573
82%
573
48%
885
September1st to 15thNight
75%
540
30%
1800
30%
540
80%
540
44%
890
September16th to endNight
72%
672
34%
1888
26%
672
77%
672
51%
977
October1st to 15thNight
63%
660
27%
1980
22%
660
67%
660
41%
1092
October16th to endNight
61%
704
29%
2112
20%
704
68%
704
38%
1177
November1st to 15thNight
60%
772
26%
2236
19%
772
64%
772
35%
1306
November16th to endNight
57%
900
24%
2520
18%
900
61%
900
39%
1429
December1st to 15thNight
54%
900
14%
2520
11%
900
57%
900
28%
1653
December16th to endNight
43%
960
12%
2688
8%
960
47%
960
20%
1944

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
35%24435%5%6%8%50%
47895
Night
34244245%6%8%52%
47131
TransparencyDay
29%8%13%22%17%8%
47581
Night
29%8%14%24%16%6%
46946
SeeingDay
7%14%28%29%16%3
5803
Night
6%6%20%41%21%3
15968

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
16%26%5%45%7%8%12%39%
1542
16th to endDay
27%36%5%35%5%6%9%43%
1728
February1st to 15thDay
17%46%5%35%6%6%11%41%
1575
16th to endDay
26%48%6%36%6%5%8%42%
1497
March1st to 15thDay
27%345%2446%10%47%
1980
16th to endDay
28%26%5%35%6%7%9%41%
2112
April1st to 15thDay
38%15%6%35%5%48%45%
2129
16th to endDay
6%8%27%6%35%5%6%8%39%
2240
May1st to 15thDay
7%5%245%345%6%8%44%
2331
16th to endDay
6%5%245%346%6%8%45%
2601
June1st to 15thDay
43133245%6%9%55%
2520
16th to endDay
112323345%69%
2520
July1st to 15thDay
32145%35%6%7%9%50%
2501
16th to endDay
3214435%5%7%8%51%
2467
August1st to 15thDay
3213435%7%8%8%51%
2340
16th to endDay
22133245%6%7%59%
2380
September1st to 15thDay
331332446%7%60%
2160
16th to endDay
423212345%68%
1838
October1st to 15thDay
6%41322435%8%56%
1650
16th to endDay
45%1331446%7%56%
1760
November1st to 15thDay
3413424448%58%
1608
16th to endDay
1425%435%5%6%9%53%
1440
December1st to 15thDay
36%36%6%37%6%6%11%38%
1440
16th to endDay
48%48%7%45%6%7%10%33%
1536
January1st to 15thNight
37%25%6%246%6%9%46%
2407
16th to endNight
27%36%6%3335%8%48%
2496
February1st to 15thNight
15%36%436%5%6%10%46%
2277
16th to endNight
26%46%5%3446%7%47%
1972
March1st to 15thNight
25%35%4245%5%10%49%
1980
16th to endNight
45%35%6%25%46%9%46%
2112
April1st to 15thNight
47%25%435%5%6%8%45%
1817
16th to endNight
6%7%235%45%5%6%8%45%
1718
May1st to 15thNight
7%5%145%3445%7%49%
1619
16th to endNight
6%324435%6%6%9%47%
1510
June1st to 15thNight
313325%5%7%9%56%
1440
16th to endNight
221213346%69%
1440
July1st to 15thNight
214426%6%7%9%54%
1457
16th to endNight
1113325%5%8%10%56%
1701
August1st to 15thNight
233425%46%8%57%
1620
16th to endNight
1224245%5%7%62%
1821
September1st to 15thNight
421432345%6%61%
1800
16th to endNight
4213213335%67%
1888
October1st to 15thNight
43144235%6%7%57%
1980
16th to endNight
342442335%7%57%
2112
November1st to 15thNight
341432445%9%54%
2236
16th to endNight
24243245%5%7%56%
2520
December1st to 15thNight
36%35%4335%7%10%45%
2520
16th to endNight
49%49%7%45%5%6%8%33%
2688

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
33%13%26%20%6%
1543
16th to endDay
37%9%18%21%11%2
1728
February1st to 15thDay
36%14%18%21%7%
1575
16th to endDay
38%10%16%25%7%1
1497
March1st to 15thDay
32%8%18%26%12%1
1980
16th to endDay
37%10%13%27%8%2
2112
April1st to 15thDay
36%8%13%22%14%3
2129
16th to endDay
40%9%11%22%14%2
2240
May1st to 15thDay
35%7%11%22%20%1
2331
16th to endDay
31%10%11%26%17%2
2604
June1st to 15thDay
23%6%11%20%26%10%
2520
16th to endDay
14%36%12%31%31%
2520
July1st to 15thDay
26%7%10%17%15%22%
2353
16th to endDay
26%7%10%18%19%18%
2312
August1st to 15thDay
24%8%12%19%15%18%
2325
16th to endDay
20%6%10%22%26%13%
2380
September1st to 15thDay
22%5%9%18%25%17%
2160
16th to endDay
18%46%28%32%9%
1838
October1st to 15thDay
27%6%12%29%21%3
1650
16th to endDay
25%7%12%32%20%1
1760
November1st to 15thDay
25%7%13%32%18%3
1608
16th to endDay
27%9%20%28%13%
1440
December1st to 15thDay
39%12%25%18%3
1440
16th to endDay
45%11%17%20%41
1536
January1st to 15thNight
33%10%20%26%7%1
2407
16th to endNight
35%7%18%23%12%2
2496
February1st to 15thNight
33%9%20%24%10%
2288
16th to endNight
34%9%16%27%10%
1972
March1st to 15thNight
30%7%19%29%11%1
1980
16th to endNight
34%8%15%29%9%2
2112
April1st to 15thNight
35%9%12%22%17%2
1817
16th to endNight
34%8%15%23%15%1
1718
May1st to 15thNight
32%9%10%24%20%2
1620
16th to endNight
30%9%12%26%18%2
1511
June1st to 15thNight
22%7%11%19%26%13%
1440
16th to endNight
14%46%10%30%33%
1440
July1st to 15thNight
23%7%9%18%17%23%
1376
16th to endNight
19%6%12%21%18%21%
1593
August1st to 15thNight
22%5%13%21%19%17%
1611
16th to endNight
18%6%10%20%30%14%
1821
September1st to 15thNight
21%5%9%18%26%17%
1800
16th to endNight
19%5%8%24%31%10%
1888
October1st to 15thNight
25%6%12%29%21%4
1980
16th to endNight
25%7%12%28%23%2
2112
November1st to 15thNight
27%9%13%27%19%3
2236
16th to endNight
24%7%18%31%15%2
2520
December1st to 15thNight
33%12%20%24%8%
2520
16th to endNight
48%8%16%19%5%
2688

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
211%27%35%22%1
90
16th to endDay
6%10%19%42%18%2
96
February1st to 15thDay
7%10%27%38%14%1
90
16th to endDay
5%17%27%37%11%
102
March1st to 15thDay
8%18%34%30%7%
270
16th to endDay
13%31%37%14%3
288
April1st to 15thDay
15%25%32%18%5%1
269
16th to endDay
18%33%23%18%6%
270
May1st to 15thDay
12%23%31%20%9%2
288
16th to endDay
10%14%24%26%18%6%
502
June1st to 15thDay
8%11%26%25%23%3
495
16th to endDay
212%25%30%25%4
495
July1st to 15thDay
37%22%30%26%9%
457
16th to endDay
5%6%29%39%16%2
327
August1st to 15thDay
5%9%35%36%10%3
315
16th to endDay
17%26%37%21%5%
332
September1st to 15thDay
214%35%25%16%5%
315
16th to endDay
9%14%25%26%19%5%
250
October1st to 15thDay
210%24%33%25%4
90
16th to endDay
11%13%22%32%16%3
96
November1st to 15thDay
310%18%30%27%10%
90
16th to endDay
12%14%30%38%4
90
December1st to 15thDay
5%5%38%44%41
90
16th to endDay
9%428%46%10%1
96
January1st to 15thNight
7%6%23%43%15%3
801
16th to endNight
5%7%23%44%16%2
768
February1st to 15thNight
45%25%49%13%1
704
16th to endNight
410%26%45%11%1
632
March1st to 15thNight
5%5%22%48%15%2
720
16th to endNight
6%9%25%42%15%1
768
April1st to 15thNight
10%12%27%36%11%1
558
16th to endNight
10%12%26%32%15%3
540
May1st to 15thNight
10%8%23%34%18%4
540
16th to endNight
6%6%20%36%25%3
563
June1st to 15thNight
5%6%22%37%25%2
540
16th to endNight
4316%44%28%2
540
July1st to 15thNight
318%39%41%4
510
16th to endNight
17%38%45%5%
564
August1st to 15thNight
317%42%40%3
539
16th to endNight
219%35%42%9%
573
September1st to 15thNight
5%211%43%29%6%
540
16th to endNight
5%214%34%29%12%
672
October1st to 15thNight
6%320%41%24%3
660
16th to endNight
6%5%21%36%24%5%
704
November1st to 15thNight
6%6%21%41%21%2
772
16th to endNight
411%22%44%14%3
900
December1st to 15thNight
7%6%25%49%11%
900
16th to endNight
9%8%25%42%11%2
960
Page generated at 2017-09-21 05:18:21. Version ac04

Copyright 2017 A. Danko


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