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 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
49%
16003
24%
48498
16%
15959
58%
15959
29%
29646

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%
780
24%
2522
10%
776
44%
776
23%
1532
January16th to endNight
29%
788
25%
2476
13%
788
43%
788
24%
1533
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
61%
717
24%
1980
18%
717
65%
717
28%
1285
October1st to 15thNight
53%
720
30%
1980
22%
720
61%
720
38%
1169
October16th to endNight
52%
768
36%
2294
27%
768
64%
768
40%
1240
November1st to 15thNight
52%
760
30%
2441
24%
760
62%
760
37%
1299
November16th to endNight
41%
780
29%
2535
20%
780
55%
780
31%
1429
December1st to 15thNight
36%
780
25%
2535
16%
780
49%
780
26%
1545
December16th to endNight
34%
832
21%
2704
14%
832
43%
832
20%
1798

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%
49021
Night
11%42442445%7%46%
48700
TransparencyDay
39%7%11%18%17%6%
48722
Night
35%6%11%18%20%8%
48503
SeeingDay
14%7%19%23%22%12%
5811
Night
13%7%23%29%22%4
16006

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%7%2432344446%
1746
16th to endDay
17%5%243235%46%44%
1851
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
15%5%26%5%3445%7%41%
1980
October1st to 15thDay
14%413423345%51%
1980
16th to endDay
10%31332323460%
1929
November1st to 15thDay
11%423323335%54%
1746
16th to endDay
12%424323346%52%
1755
December1st to 15thDay
15%6%2333345%6%45%
1755
16th to endDay
22%9%35%423335%36%
1872
January1st to 15thNight
15%6%24423345%47%
2522
16th to endNight
17%5%24423345%46%
2476
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
10%6%25%4345%6%7%43%
1980
October1st to 15thNight
12%5%14323335%54%
1980
16th to endNight
9%313323345%59%
2294
November1st to 15thNight
10%413313345%58%
2441
16th to endNight
11%4245%23336%52%
2535
December1st to 15thNight
13%6%34423445%47%
2535
16th to endNight
19%6%35%42435%6%37%
2704

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
40%36%16%26%5%
1747
16th to endDay
40%46%15%23%9%
1851
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
42%5%9%21%16%4
1980
October1st to 15thDay
35%39%19%23%7%
1980
16th to endDay
28%35%16%30%16%
1929
November1st to 15thDay
32%36%17%25%14%
1746
16th to endDay
33%37%17%24%12%
1755
December1st to 15thDay
39%49%18%19%8%
1755
16th to endDay
51%36%17%13%7%
1872
January1st to 15thNight
39%36%17%25%7%
2522
16th to endNight
41%26%14%23%11%
2476
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
37%8%11%18%18%5%
1980
October1st to 15thNight
32%39%21%20%11%
1980
16th to endNight
27%35%14%32%16%
2294
November1st to 15thNight
28%38%16%28%14%
2441
16th to endNight
33%37%16%25%14%
2535
December1st to 15thNight
38%48%18%21%7%
2535
16th to endNight
46%46%18%16%6%
2704

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
19%23%37%11%5%2
135
16th to endDay
15%25%42%10%6%
109
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
17%211%32%25%11%
314
October1st to 15thDay
20%218%27%20%10%
315
16th to endDay
11%10%20%27%22%7%
336
November1st to 15thDay
20%7%25%32%12%2
164
16th to endDay
8%11%36%25%14%3
135
December1st to 15thDay
23%16%32%20%7%
135
16th to endDay
32%17%27%20%2
144
January1st to 15thNight
17%17%32%23%8%
780
16th to endNight
19%14%32%28%4
788
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
13%213%36%31%3
717
October1st to 15thNight
15%223%27%26%4
720
16th to endNight
11%7%25%28%24%2
768
November1st to 15thNight
12%6%24%33%22%1
760
16th to endNight
11%11%29%30%15%1
780
December1st to 15thNight
17%9%32%26%13%1
780
16th to endNight
21%10%29%28%7%1
832
Page generated at 2018-01-21 12:19:24. Version ac04

Copyright 2018 A. Danko


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