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 2018-01-20.

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%
16507
22%
48534
18%
16465
64%
16465
35%
28398

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
54%
866
18%
2609
15%
863
57%
863
29%
1598
January16th to endNight
54%
788
22%
2561
19%
788
59%
788
28%
1548
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%
713
35%
2001
27%
713
77%
713
51%
1033
October1st to 15thNight
63%
720
27%
2160
21%
720
68%
720
42%
1175
October16th to endNight
62%
768
31%
2304
22%
768
69%
768
40%
1254
November1st to 15thNight
60%
838
26%
2428
19%
838
65%
838
35%
1421
November16th to endNight
58%
975
25%
2730
19%
975
62%
975
39%
1542
December1st to 15thNight
55%
975
15%
2730
12%
975
58%
975
30%
1760
December16th to endNight
45%
1040
14%
2912
9%
1040
48%
1040
21%
2071

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%244345%6%8%50%
48995
Night
34244245%6%8%52%
48719
TransparencyDay
29%8%13%22%17%8%
48681
Night
28%8%14%24%17%6%
48534
SeeingDay
7%14%28%29%16%3
6178
Night
6%6%20%42%21%3
16516

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
15%26%6%45%7%8%11%39%
1671
16th to endDay
27%36%5%35%5%6%9%44%
1766
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
4313312345%67%
1956
October1st to 15thDay
7%41222435%8%57%
1800
16th to endDay
441331446%7%58%
1920
November1st to 15thDay
241342445%8%58%
1745
16th to endDay
1424325%45%10%54%
1560
December1st to 15thDay
26%36%6%37%5%6%10%40%
1560
16th to endDay
47%47%6%45%6%7%10%35%
1664
January1st to 15thNight
36%245%246%6%9%47%
2609
16th to endNight
27%36%5%3335%8%48%
2561
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
4213213336%67%
2001
October1st to 15thNight
5%31342345%7%58%
2160
16th to endNight
341442335%8%59%
2304
November1st to 15thNight
341432445%9%54%
2428
16th to endNight
23143245%5%8%56%
2730
December1st to 15thNight
36%35%4335%7%9%47%
2730
16th to endNight
49%49%6%45%5%6%8%35%
2912

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%25%20%6%
1672
16th to endDay
36%10%18%21%10%2
1766
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
19%46%28%32%8%
1956
October1st to 15thDay
26%6%11%28%22%4
1800
16th to endDay
24%7%13%32%20%2
1920
November1st to 15thDay
24%8%13%32%17%2
1745
16th to endDay
25%8%21%30%12%
1560
December1st to 15thDay
37%12%24%19%6%
1560
16th to endDay
42%11%17%21%6%
1664
January1st to 15thNight
31%10%20%27%8%1
2609
16th to endNight
35%7%19%23%12%2
2561
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%48%26%30%10%
2001
October1st to 15thNight
25%5%12%28%22%6%
2160
16th to endNight
24%7%13%28%24%2
2304
November1st to 15thNight
27%9%13%27%19%3
2428
16th to endNight
23%8%18%32%15%2
2730
December1st to 15thNight
32%11%19%24%10%
2730
16th to endNight
46%8%16%20%6%
2912

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%26%40%18%
135
16th to endDay
5%10%19%42%21%1
109
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%15%25%25%18%4
291
October1st to 15thDay
8%13%25%29%20%2
135
16th to endDay
8%13%25%32%18%2
144
November1st to 15thDay
414%21%33%18%7%
135
16th to endDay
9%14%28%42%5%
135
December1st to 15thDay
5%6%32%45%8%1
135
16th to endDay
6%5%27%49%10%
144
January1st to 15thNight
6%6%23%45%15%2
868
16th to endNight
5%7%23%44%16%2
788
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%35%29%11%
713
October1st to 15thNight
6%320%42%22%3
720
16th to endNight
6%5%20%37%23%5%
768
November1st to 15thNight
6%6%21%43%19%2
838
16th to endNight
410%22%46%13%2
975
December1st to 15thNight
7%5%24%50%11%
975
16th to endNight
9%7%25%44%10%2
1040
Page generated at 2018-01-21 10:19:26. Version ac04

Copyright 2018 A. Danko


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