Big Lazer Creek WMA
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Big Lazer Creek WMA 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
49%
15515
23%
46982
16%
15471
58%
15471
29%
28780

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
27%
720
24%
2327
10%
716
45%
716
23%
1413
January16th to endNight
28%
768
24%
2412
11%
768
43%
768
24%
1504
February1st to 15thNight
33%
704
26%
2109
11%
700
48%
700
28%
1283
February16th to endNight
28%
631
25%
1893
10%
631
43%
631
28%
1156
March1st to 15thNight
32%
720
25%
2064
12%
720
44%
720
30%
1259
March16th to endNight
40%
768
23%
2112
12%
768
49%
768
32%
1293
April1st to 15thNight
45%
641
25%
1899
18%
641
53%
641
33%
1100
April16th to endNight
50%
540
28%
1725
20%
540
59%
540
36%
936
May1st to 15thNight
54%
539
24%
1620
15%
539
61%
539
33%
965
May16th to endNight
62%
561
22%
1682
16%
561
66%
561
33%
1014
June1st to 15thNight
69%
540
16%
1620
14%
540
71%
540
29%
1037
June16th to endNight
76%
540
17%
1620
16%
540
76%
540
32%
1002
July1st to 15thNight
77%
510
12%
1530
12%
510
77%
510
27%
1009
July16th to endNight
74%
564
14%
1595
12%
531
74%
531
28%
1045
August1st to 15thNight
75%
539
16%
1684
18%
536
75%
536
26%
1107
August16th to endNight
63%
573
17%
1910
19%
573
65%
573
21%
1306
September1st to 15thNight
65%
708
19%
1968
18%
708
67%
708
28%
1304
September16th to endNight
59%
677
23%
1870
17%
677
63%
677
27%
1231
October1st to 15thNight
53%
660
32%
1815
23%
660
62%
660
38%
1071
October16th to endNight
53%
704
34%
2103
27%
704
64%
704
39%
1145
November1st to 15thNight
51%
700
31%
2248
24%
700
61%
700
37%
1194
November16th to endNight
39%
720
28%
2340
18%
720
53%
720
30%
1332
December1st to 15thNight
36%
720
25%
2340
16%
720
48%
720
26%
1425
December16th to endNight
34%
768
21%
2496
15%
768
44%
768
20%
1649

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%5%25%5%35%5%5%7%41%
47848
Night
11%42442445%7%46%
47184
TransparencyDay
39%7%11%18%17%6%
47549
Night
35%6%11%18%19%8%
46987
SeeingDay
14%6%19%23%22%12%
5400
Night
13%7%23%29%22%4
15518

By Month

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
15%6%2432444446%
1611
16th to endDay
17%5%243235%46%43%
1811
February1st to 15thDay
13%5%25%32445%6%44%
1750
16th to endDay
15%6%25%315%437%44%
1580
March1st to 15thDay
14%6%245%335%45%45%
1895
16th to endDay
14%5%25%425%45%7%44%
2111
April1st to 15thDay
12%5%24434446%47%
2058
16th to endDay
9%424424347%51%
2232
May1st to 15thDay
10%4245%4445%8%44%
2331
16th to endDay
8%425%6%36%5%6%8%43%
2431
June1st to 15thDay
9%5%26%8%46%7%7%10%31%
2340
16th to endDay
5%3245%48%8%8%11%37%
2340
July1st to 15thDay
10%5%36%6%5%8%7%7%12%26%
2340
16th to endDay
7%5%26%8%49%9%9%11%25%
2465
August1st to 15thDay
9%5%35%8%5%8%7%8%11%26%
2262
16th to endDay
14%5%36%7%47%7%7%7%28%
2292
September1st to 15thDay
13%6%25%6%45%5%6%8%35%
1980
16th to endDay
16%5%26%5%3445%7%39%
1859
October1st to 15thDay
14%413423345%52%
1815
16th to endDay
11%31232333459%
1768
November1st to 15thDay
11%423423335%55%
1609
16th to endDay
13%424323346%51%
1620
December1st to 15thDay
15%6%2333345%5%45%
1620
16th to endDay
22%8%35%423335%36%
1728
January1st to 15thNight
15%6%24423345%47%
2327
16th to endNight
17%5%34423345%45%
2412
February1st to 15thNight
15%424424346%48%
2103
16th to endNight
14%5%2432445%5%47%
1893
March1st to 15thNight
11%425%424247%50%
2064
16th to endNight
11%42431335%7%49%
2112
April1st to 15thNight
10%5%2432335%8%50%
1899
16th to endNight
8%22342445%7%53%
1725
May1st to 15thNight
7%3146%235%5%8%50%
1619
16th to endNight
7%424436%5%6%8%47%
1682
June1st to 15thNight
7%325%5%45%5%6%11%40%
1620
16th to endNight
4314437%7%9%13%39%
1620
July1st to 15thNight
5%3246%47%8%8%12%35%
1620
16th to endNight
6%3245%36%8%10%12%35%
1703
August1st to 15thNight
6%415%5%47%6%9%12%36%
1695
16th to endNight
12%426%6%35%6%7%9%34%
1910
September1st to 15thNight
9%4246%35%6%6%9%40%
1968
16th to endNight
11%6%25%4345%5%7%42%
1870
October1st to 15thNight
12%5%14323435%54%
1815
16th to endNight
10%313312335%59%
2103
November1st to 15thNight
10%41331334458%
2248
16th to endNight
12%423423336%51%
2340
December1st to 15thNight
12%6%34424445%47%
2340
16th to endNight
19%6%35%42435%6%38%
2496

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
41%36%15%26%6%
1612
16th to endDay
41%46%15%23%8%
1811
February1st to 15thDay
39%5%6%18%22%7%
1752
16th to endDay
39%45%18%24%7%
1580
March1st to 15thDay
39%48%17%20%8%
1895
16th to endDay
38%5%10%20%19%5%
2112
April1st to 15thDay
36%49%20%20%8%
2058
16th to endDay
31%5%10%21%23%7%
2232
May1st to 15thDay
36%7%11%18%21%5%
2331
16th to endDay
36%8%13%24%14%3
2435
June1st to 15thDay
43%9%14%21%9%1
2340
16th to endDay
34%11%17%19%14%1
2340
July1st to 15thDay
44%12%21%13%6%1
2201
16th to endDay
44%11%19%16%6%
2310
August1st to 15thDay
44%12%17%17%7%
2249
16th to endDay
48%11%14%14%9%
2292
September1st to 15thDay
44%9%13%15%12%4
1980
16th to endDay
44%5%9%20%15%4
1859
October1st to 15thDay
34%49%20%23%8%
1815
16th to endDay
29%35%16%29%15%
1768
November1st to 15thDay
32%35%16%25%16%
1609
16th to endDay
34%46%17%24%12%
1620
December1st to 15thDay
39%49%18%19%8%
1620
16th to endDay
50%37%16%14%7%
1728
January1st to 15thNight
39%36%17%25%7%
2327
16th to endNight
41%36%14%23%10%
2412
February1st to 15thNight
37%35%19%21%13%
2112
16th to endNight
37%47%16%23%11%
1893
March1st to 15thNight
35%48%19%22%9%
2064
16th to endNight
32%5%10%19%22%8%
2112
April1st to 15thNight
31%48%22%21%10%
1899
16th to endNight
29%411%23%21%10%
1725
May1st to 15thNight
30%7%12%18%24%5%
1620
16th to endNight
31%7%14%24%15%5%
1684
June1st to 15thNight
34%10%17%25%11%
1620
16th to endNight
31%10%21%19%13%3
1620
July1st to 15thNight
33%13%23%18%7%2
1530
16th to endNight
34%12%25%18%8%1
1595
August1st to 15thNight
35%12%20%20%9%1
1684
16th to endNight
41%11%16%16%12%1
1910
September1st to 15thNight
36%10%14%18%15%4
1968
16th to endNight
39%8%11%18%17%5%
1870
October1st to 15thNight
32%39%20%20%12%
1815
16th to endNight
28%35%15%30%16%
2103
November1st to 15thNight
28%36%15%29%15%
2248
16th to endNight
34%36%15%25%14%
2340
December1st to 15thNight
38%47%19%21%8%
2340
16th to endNight
45%46%18%17%7%
2496

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
20%21%34%12%7%4
90
16th to endDay
17%26%42%7%6%
96
February1st to 15thDay
10%33%36%16%3
90
16th to endDay
18%18%43%19%
81
March1st to 15thDay
16%19%34%18%10%1
185
16th to endDay
13%11%32%28%13%
288
April1st to 15thDay
17%14%25%21%18%2
270
16th to endDay
10%431%26%20%5%
270
May1st to 15thDay
14%9%26%20%16%13%
288
16th to endDay
12%316%25%25%16%
331
June1st to 15thDay
11%114%26%24%21%
315
16th to endDay
8%19%26%27%25%
315
July1st to 15thDay
10%7%20%35%25%
305
16th to endDay
5%17%20%37%27%
326
August1st to 15thDay
13%7%24%34%19%
313
16th to endDay
15%18%23%31%19%
332
September1st to 15thDay
18%19%22%28%18%
315
16th to endDay
19%311%33%22%9%
270
October1st to 15thDay
20%317%29%21%8%
255
16th to endDay
12%7%20%27%23%8%
272
November1st to 15thDay
23%9%27%27%11%1
117
16th to endDay
10%12%36%23%14%3
90
December1st to 15thDay
20%18%34%16%10%
90
16th to endDay
34%16%23%20%4
96
January1st to 15thNight
18%16%32%24%8%
720
16th to endNight
19%14%33%28%4
768
February1st to 15thNight
16%13%32%30%7%
704
16th to endNight
15%15%37%27%4
631
March1st to 15thNight
13%14%36%27%8%
720
16th to endNight
15%11%28%27%16%
768
April1st to 15thNight
13%9%29%31%15%
641
16th to endNight
9%6%28%32%20%1
540
May1st to 15thNight
7%6%25%31%23%5%
540
16th to endNight
9%117%34%31%5%
563
June1st to 15thNight
9%110%33%34%10%
540
16th to endNight
319%30%42%12%
540
July1st to 15thNight
7%1429%42%15%
510
16th to endNight
8%6%22%48%13%
564
August1st to 15thNight
7%428%43%14%
539
16th to endNight
13%8%25%39%12%
573
September1st to 15thNight
11%110%27%37%10%
708
16th to endNight
14%214%37%29%3
677
October1st to 15thNight
16%222%28%26%4
660
16th to endNight
11%7%24%29%24%2
704
November1st to 15thNight
12%7%25%32%21%2
700
16th to endNight
12%11%30%29%14%1
720
December1st to 15thNight
16%9%32%26%13%1
720
16th to endNight
22%10%28%29%7%1
768
Page generated at 2017-09-21 07:18:20. Version ac04

Copyright 2017 A. Danko


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