Worth Mountain WMA
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Worth Mountain WMA clear sky chart from 2005-11-05 to 2017-09-18.

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
47%
15744
22%
46920
14%
15704
55%
15704
27%
29635

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
33%
718
24%
2327
12%
716
48%
716
22%
1406
January16th to endNight
29%
768
25%
2496
12%
768
45%
768
24%
1521
February1st to 15thNight
28%
703
23%
2217
9%
701
44%
701
25%
1336
February16th to endNight
22%
631
26%
1880
9%
631
40%
631
26%
1174
March1st to 15thNight
34%
720
26%
1980
14%
720
45%
720
30%
1240
March16th to endNight
36%
768
20%
2112
10%
768
44%
768
27%
1367
April1st to 15thNight
39%
718
24%
1940
11%
718
49%
718
34%
1191
April16th to endNight
45%
612
25%
1692
12%
612
52%
612
32%
1048
May1st to 15thNight
49%
540
17%
1620
9%
540
55%
540
26%
1046
May16th to endNight
59%
561
17%
1684
12%
561
61%
561
26%
1093
June1st to 15thNight
62%
540
13%
1620
11%
540
63%
540
23%
1119
June16th to endNight
65%
540
15%
1620
13%
540
66%
540
26%
1075
July1st to 15thNight
68%
510
10%
1530
9%
510
68%
510
24%
1033
July16th to endNight
68%
564
13%
1595
10%
531
70%
531
25%
1080
August1st to 15thNight
67%
539
13%
1609
12%
536
67%
536
23%
1117
August16th to endNight
66%
651
17%
1815
14%
651
67%
651
25%
1257
September1st to 15thNight
65%
720
19%
1980
16%
720
67%
720
31%
1286
September16th to endNight
54%
669
19%
1848
15%
669
58%
669
25%
1274
October1st to 15thNight
51%
660
30%
1919
26%
660
58%
660
32%
1167
October16th to endNight
52%
704
33%
2112
24%
704
66%
704
37%
1167
November1st to 15thNight
52%
700
30%
2148
22%
700
63%
700
36%
1195
November16th to endNight
44%
720
26%
2340
20%
720
54%
720
28%
1364
December1st to 15thNight
41%
720
23%
2340
16%
720
51%
720
24%
1445
December16th to endNight
35%
768
23%
2496
16%
768
45%
768
21%
1634

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
13%5%2442445%7%43%
47872
Night
13%42442445%7%44%
47117
TransparencyDay
38%7%11%20%17%4
47573
Night
37%6%11%18%19%5%
46920
SeeingDay
17%5%19%24%22%11%
5589
Night
16%6%22%30%21%2
15749

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
18%7%2441334444%
1611
16th to endDay
16%5%24323345%48%
1728
February1st to 15thDay
15%5%23324445%47%
1642
16th to endDay
17%414423335%48%
1592
March1st to 15thDay
14%5%23423346%49%
1980
16th to endDay
17%41432445%7%43%
2111
April1st to 15thDay
12%41442345%8%49%
2008
16th to endDay
14%414424445%47%
2277
May1st to 15thDay
11%5%25%5%25%46%7%42%
2331
16th to endDay
10%42443446%8%44%
2431
June1st to 15thDay
9%425%5%35%6%7%9%39%
2340
16th to endDay
5%3145%46%6%7%10%43%
2340
July1st to 15thDay
9%5%35%5%36%6%8%10%34%
2340
16th to endDay
7%4245%38%7%10%11%34%
2465
August1st to 15thDay
14%5%25%5%46%6%7%11%30%
2340
16th to endDay
11%6%25%7%46%6%7%11%31%
2372
September1st to 15thDay
9%425%436%6%6%9%42%
1980
16th to endDay
17%6%25%5%34445%39%
1837
October1st to 15thDay
16%41331124456%
1710
16th to endDay
13%41231222460%
1760
November1st to 15thDay
12%412323246%56%
1709
16th to endDay
17%41243335%5%49%
1620
December1st to 15thDay
15%7%25%32445%6%42%
1620
16th to endDay
22%6%25%313345%41%
1728
January1st to 15thNight
17%42342433448%
2327
16th to endNight
17%5%2432334447%
2496
February1st to 15thNight
14%414424335%50%
2208
16th to endNight
14%425%425%346%47%
1880
March1st to 15thNight
15%423324446%48%
1980
16th to endNight
14%5%2442445%7%44%
2112
April1st to 15thNight
13%5%13323348%50%
1940
16th to endNight
12%4244235%46%48%
1692
May1st to 15thNight
9%5%36%5%35%46%9%41%
1619
16th to endNight
10%425%5%36%6%7%8%40%
1682
June1st to 15thNight
10%326%6%46%6%8%10%34%
1620
16th to endNight
6%425%7%36%7%7%11%37%
1620
July1st to 15thNight
8%5%16%6%46%6%8%12%32%
1620
16th to endNight
6%335%7%37%7%8%12%32%
1703
August1st to 15thNight
11%5%25%6%46%5%8%10%32%
1620
16th to endNight
9%6%25%6%46%6%8%10%34%
1815
September1st to 15thNight
10%425%5%25%5%7%9%41%
1980
16th to endNight
18%5%24435%45%6%39%
1848
October1st to 15thNight
17%413322235%53%
1919
16th to endNight
12%313313335%57%
2112
November1st to 15thNight
13%313223336%56%
2148
16th to endNight
15%323324346%49%
2340
December1st to 15thNight
16%6%2432345%5%46%
2340
16th to endNight
22%6%23423335%41%
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
43%46%18%21%5%
1612
16th to endDay
39%36%20%21%8%
1728
February1st to 15thDay
37%5%8%20%23%4
1644
16th to endDay
38%47%23%21%4
1592
March1st to 15thDay
37%5%6%22%22%6%
1980
16th to endDay
39%6%11%19%19%3
2112
April1st to 15thDay
32%5%9%23%22%6%
2008
16th to endDay
37%6%9%19%19%7%
2277
May1st to 15thDay
39%8%14%19%16%2
2331
16th to endDay
36%9%15%23%14%2
2435
June1st to 15thDay
37%8%17%25%10%
2340
16th to endDay
32%11%17%21%14%1
2340
July1st to 15thDay
39%10%19%18%8%3
2201
16th to endDay
37%12%19%19%10%1
2310
August1st to 15thDay
44%10%15%17%10%1
2327
16th to endDay
44%11%15%17%10%1
2372
September1st to 15thDay
36%9%13%19%17%3
1980
16th to endDay
46%5%9%16%17%5%
1837
October1st to 15thDay
33%49%20%27%5%
1710
16th to endDay
30%36%20%30%10%
1760
November1st to 15thDay
30%37%18%29%9%
1709
16th to endDay
37%37%20%23%7%
1620
December1st to 15thDay
41%5%9%19%18%5%
1620
16th to endDay
45%49%16%17%5%
1728
January1st to 15thNight
39%38%16%23%7%
2327
16th to endNight
39%46%19%23%7%
2496
February1st to 15thNight
37%47%19%23%6%
2217
16th to endNight
37%49%21%22%4
1880
March1st to 15thNight
36%5%9%20%20%8%
1980
16th to endNight
39%5%11%18%20%5%
2112
April1st to 15thNight
33%48%22%23%6%
1940
16th to endNight
35%5%10%20%20%8%
1692
May1st to 15thNight
38%8%13%19%17%2
1620
16th to endNight
37%9%11%24%14%1
1684
June1st to 15thNight
40%12%15%20%9%1
1620
16th to endNight
37%10%15%20%11%4
1620
July1st to 15thNight
38%12%21%16%7%3
1530
16th to endNight
38%12%19%18%8%2
1595
August1st to 15thNight
41%12%19%16%10%
1609
16th to endNight
40%11%19%17%10%
1815
September1st to 15thNight
35%9%16%17%16%4
1980
16th to endNight
43%8%11%14%17%4
1848
October1st to 15thNight
34%5%7%20%24%6%
1919
16th to endNight
29%37%19%28%11%
2112
November1st to 15thNight
30%46%16%29%13%
2148
16th to endNight
35%45%18%26%8%
2340
December1st to 15thNight
39%5%9%19%19%7%
2340
16th to endNight
45%49%15%18%6%
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
25%15%30%23%5%
90
16th to endDay
20%22%38%13%4
96
February1st to 15thDay
20%22%50%7%
90
16th to endDay
19%16%40%17%6%
93
March1st to 15thDay
17%12%30%30%8%
270
16th to endDay
19%10%30%26%10%2
288
April1st to 15thDay
18%12%21%28%15%2
270
16th to endDay
20%221%25%21%7%
270
May1st to 15thDay
13%10%29%21%16%8%
288
16th to endDay
14%413%18%30%18%
331
June1st to 15thDay
13%310%23%28%20%
315
16th to endDay
8%16%27%26%20%
315
July1st to 15thDay
9%110%24%33%20%
305
16th to endDay
8%8%25%34%21%
326
August1st to 15thDay
23%7%17%30%20%
313
16th to endDay
13%19%25%27%22%
332
September1st to 15thDay
16%112%20%30%18%
315
16th to endDay
25%17%21%24%9%
262
October1st to 15thDay
21%319%29%17%7%
255
16th to endDay
16%414%33%25%6%
272
November1st to 15thDay
22%5%19%27%18%5%
217
16th to endDay
12%7%26%30%21%2
90
December1st to 15thDay
24%10%35%18%11%
90
16th to endDay
38%12%27%13%8%
96
January1st to 15thNight
20%14%27%30%7%
720
16th to endNight
19%13%34%30%2
768
February1st to 15thNight
19%13%37%28%2
704
16th to endNight
17%14%41%23%3
631
March1st to 15thNight
17%10%33%30%6%
720
16th to endNight
18%10%30%29%10%
768
April1st to 15thNight
16%11%30%28%12%
718
16th to endNight
14%6%26%33%17%1
612
May1st to 15thNight
12%5%26%35%18%
540
16th to endNight
12%215%31%34%2
563
June1st to 15thNight
13%112%34%32%6%
540
16th to endNight
8%11%31%38%9%
540
July1st to 15thNight
11%16%32%39%8%
510
16th to endNight
9%7%26%46%9%
564
August1st to 15thNight
14%16%27%44%5%
539
16th to endNight
11%17%26%44%6%
651
September1st to 15thNight
10%111%28%40%7%
720
16th to endNight
21%215%27%28%4
669
October1st to 15thNight
19%420%25%25%4
660
16th to endNight
14%6%23%31%20%4
704
November1st to 15thNight
13%425%34%19%3
700
16th to endNight
15%10%25%32%15%1
720
December1st to 15thNight
20%8%23%35%10%
720
16th to endNight
25%9%24%30%9%
768
Page generated at 2017-09-19 07:32:29. Version ac04

Copyright 2017 A. Danko


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