West Carry Pond
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the West Carry Pond 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
27%
14749
15%
46882
7%
14717
36%
14717
15%
32457

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
18%
720
15%
2506
5%
716
30%
716
12%
1732
January16th to endNight
13%
768
14%
2688
3%
768
27%
768
9%
1871
February1st to 15thNight
16%
704
12%
2296
4%
701
26%
701
10%
1649
February16th to endNight
13%
631
16%
1893
3%
631
29%
631
12%
1332
March1st to 15thNight
17%
720
15%
2130
5%
720
28%
720
11%
1549
March16th to endNight
24%
768
19%
2070
6%
768
34%
768
17%
1428
April1st to 15thNight
23%
703
16%
1781
3%
703
30%
703
17%
1290
April16th to endNight
25%
540
15%
1620
5%
540
34%
540
16%
1141
May1st to 15thNight
25%
540
13%
1620
7%
540
33%
540
15%
1179
May16th to endNight
28%
383
11%
1505
10%
382
37%
382
12%
1077
June1st to 15thNight
29%
360
9%
1269
6%
360
36%
360
12%
928
June16th to endNight
42%
360
10%
1273
10%
360
47%
360
19%
841
July1st to 15thNight
46%
340
10%
1360
14%
340
51%
340
19%
863
July16th to endNight
47%
376
11%
1418
12%
354
52%
354
18%
896
August1st to 15thNight
41%
487
11%
1558
8%
485
45%
485
20%
1031
August16th to endNight
47%
623
20%
1769
12%
623
51%
623
30%
1089
September1st to 15thNight
44%
720
16%
1882
7%
720
49%
720
31%
1211
September16th to endNight
44%
669
23%
1847
13%
669
51%
669
31%
1140
October1st to 15thNight
30%
660
18%
1873
8%
660
40%
660
20%
1282
October16th to endNight
21%
704
12%
2288
5%
704
30%
704
12%
1627
November1st to 15thNight
29%
700
17%
2277
10%
700
39%
700
15%
1609
November16th to endNight
26%
734
18%
2445
9%
734
38%
734
14%
1653
December1st to 15thNight
16%
750
11%
2700
3%
750
28%
750
10%
1960
December16th to endNight
12%
789
12%
2814
2%
789
24%
789
7%
2079

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
17%9%36%6%35%45%6%30%
47906
Night
16%8%36%5%3445%7%33%
47052
TransparencyDay
52%5%11%19%10%1
47594
Night
49%5%12%21%10%1
46882
SeeingDay
25%17%26%17%9%2
6145
Night
24%16%25%23%8%
14749

By Month

Percentage Cloud Cover NE (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
13%9%48%8%45%5%7%7%26%
1432
16th to endDay
12%10%37%7%46%47%6%30%
1536
February1st to 15thDay
12%14%48%8%36%45%6%25%
1562
16th to endDay
10%13%5%8%6%5%6%6%5%6%25%
1580
March1st to 15thDay
16%11%5%8%5%3445%6%28%
1820
16th to endDay
14%10%47%6%34345%36%
2153
April1st to 15thDay
15%11%47%6%34346%31%
2167
16th to endDay
19%10%36%5%23345%34%
2340
May1st to 15thDay
24%10%35%5%34446%27%
2333
16th to endDay
20%7%36%6%46%6%5%6%25%
2618
June1st to 15thDay
27%7%35%6%34447%24%
2688
16th to endDay
21%6%36%6%35%45%7%28%
2682
July1st to 15thDay
13%5%36%6%45%5%6%8%32%
2520
16th to endDay
16%6%37%6%47%6%6%8%27%
2654
August1st to 15thDay
17%6%25%6%47%5%6%7%29%
2379
16th to endDay
11%5%26%6%45%45%7%40%
2432
September1st to 15thDay
14%6%26%423445%43%
2077
16th to endDay
13%6%34423447%45%
1838
October1st to 15thDay
18%9%35%5%3345%6%34%
1754
16th to endDay
19%13%46%6%3345%6%25%
1584
November1st to 15thDay
18%8%47%5%35%5%5%6%29%
1581
16th to endDay
18%8%37%7%2435%7%31%
1509
December1st to 15thDay
17%14%6%7%6%34445%24%
1260
16th to endDay
21%13%46%7%345%5%5%23%
1407
January1st to 15thNight
13%11%37%7%2445%8%30%
2506
16th to endNight
11%10%47%6%36%6%5%6%29%
2688
February1st to 15thNight
10%10%5%9%8%46%46%7%26%
2295
16th to endNight
15%11%46%5%245%46%32%
1893
March1st to 15thNight
16%12%46%5%3445%5%31%
2117
16th to endNight
13%8%36%435%5%5%6%37%
2070
April1st to 15thNight
17%9%25%5%35%5%6%6%31%
1781
16th to endNight
21%7%25%5%245%45%34%
1620
May1st to 15thNight
20%7%45%6%35%446%31%
1620
16th to endNight
20%8%35%6%245%5%8%28%
1503
June1st to 15thNight
25%8%26%6%34337%27%
1269
16th to endNight
19%6%25%5%235%5%7%36%
1273
July1st to 15thNight
14%6%26%5%2446%9%36%
1440
16th to endNight
13%5%246%25%5%6%9%38%
1514
August1st to 15thNight
14%7%36%42445%7%38%
1568
16th to endNight
12%41432445%6%48%
1769
September1st to 15thNight
14%5%2341445%6%47%
1882
16th to endNight
13%5%24424447%48%
1847
October1st to 15thNight
17%8%36%42445%6%36%
1873
16th to endNight
21%9%36%5%25%5%47%29%
2288
November1st to 15thNight
17%8%35%7%35%5%5%6%31%
2277
16th to endNight
15%8%45%5%3445%6%34%
2445
December1st to 15thNight
19%11%5%7%5%34447%25%
2700
16th to endNight
19%13%5%8%5%2445%6%24%
2814

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
54%5%13%14%9%2
1433
16th to endDay
52%411%19%12%
1536
February1st to 15thDay
59%311%15%9%
1565
16th to endDay
57%411%13%10%2
1580
March1st to 15thDay
55%411%14%11%2
1830
16th to endDay
50%38%19%14%3
2153
April1st to 15thDay
53%47%18%13%3
2167
16th to endDay
52%39%18%11%3
2340
May1st to 15thDay
57%49%17%10%1
2333
16th to endDay
57%6%9%16%8%
2622
June1st to 15thDay
59%5%12%15%6%
2688
16th to endDay
54%6%10%19%8%
2682
July1st to 15thDay
45%7%16%22%7%
2371
16th to endDay
51%7%13%20%6%
2487
August1st to 15thDay
51%8%14%19%5%
2365
16th to endDay
41%5%15%23%13%
2432
September1st to 15thDay
41%5%12%27%12%
2077
16th to endDay
39%412%28%14%
1838
October1st to 15thDay
49%411%23%10%
1754
16th to endDay
57%411%17%8%
1584
November1st to 15thDay
52%413%16%11%1
1581
16th to endDay
52%414%18%9%1
1509
December1st to 15thDay
60%410%16%7%
1260
16th to endDay
61%39%14%10%
1407
January1st to 15thNight
51%413%19%9%
2506
16th to endNight
52%5%10%19%10%1
2688
February1st to 15thNight
54%411%18%8%1
2296
16th to endNight
51%411%18%12%1
1893
March1st to 15thNight
53%49%18%11%2
2130
16th to endNight
44%5%11%19%15%3
2070
April1st to 15thNight
50%410%18%15%1
1781
16th to endNight
50%5%10%17%13%3
1620
May1st to 15thNight
52%6%7%19%12%1
1620
16th to endNight
53%7%11%19%6%
1505
June1st to 15thNight
57%5%11%16%7%
1269
16th to endNight
45%5%14%23%9%
1273
July1st to 15thNight
42%7%15%23%10%
1360
16th to endNight
42%8%16%22%9%
1418
August1st to 15thNight
43%7%16%25%6%
1558
16th to endNight
34%6%16%28%13%
1769
September1st to 15thNight
36%5%13%31%12%
1882
16th to endNight
35%412%32%14%
1847
October1st to 15thNight
46%412%23%12%
1873
16th to endNight
53%5%12%21%7%
2288
November1st to 15thNight
51%5%12%18%10%1
2277
16th to endNight
48%5%11%23%10%1
2445
December1st to 15thNight
57%411%19%6%
2700
16th to endNight
58%5%11%14%10%
2814

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
21%26%36%13%1
60
16th to endDay
26%25%29%12%6%
64
February1st to 15thDay
29%22%26%17%3
193
16th to endDay
23%29%21%20%4
239
March1st to 15thDay
30%17%30%19%2
270
16th to endDay
25%26%24%12%7%3
288
April1st to 15thDay
33%18%27%11%7%2
270
16th to endDay
32%18%25%12%5%4
270
May1st to 15thDay
38%15%27%9%6%2
288
16th to endDay
24%19%35%14%6%
331
June1st to 15thDay
28%17%25%18%8%
483
16th to endDay
24%11%27%22%11%1
477
July1st to 15thDay
18%13%35%17%14%1
305
16th to endDay
18%8%38%24%7%2
326
August1st to 15thDay
18%8%32%22%15%3
313
16th to endDay
17%13%24%20%16%6%
332
September1st to 15thDay
17%12%24%24%13%6%
315
16th to endDay
17%12%22%19%15%12%
262
October1st to 15thDay
27%18%18%14%15%4
244
16th to endDay
32%23%17%20%5%
240
November1st to 15thDay
26%18%20%20%11%2
235
16th to endDay
32%20%19%17%7%2
216
December1st to 15thDay
26%31%28%6%6%
60
16th to endDay
42%21%29%41
64
January1st to 15thNight
23%20%30%20%4
720
16th to endNight
25%21%30%17%3
768
February1st to 15thNight
21%20%31%23%3
704
16th to endNight
26%22%31%16%3
631
March1st to 15thNight
28%19%28%20%2
720
16th to endNight
21%24%23%22%7%
768
April1st to 15thNight
26%19%27%20%5%
703
16th to endNight
27%16%27%20%8%
540
May1st to 15thNight
26%15%25%22%8%
540
16th to endNight
23%11%29%25%10%
383
June1st to 15thNight
29%10%23%25%10%
360
16th to endNight
21%9%21%34%13%
360
July1st to 15thNight
18%5%22%35%16%
340
16th to endNight
16%422%36%19%
376
August1st to 15thNight
18%425%31%18%1
487
16th to endNight
14%7%23%33%18%2
623
September1st to 15thNight
18%8%23%31%15%2
720
16th to endNight
17%11%22%28%18%2
669
October1st to 15thNight
25%15%21%22%12%2
660
16th to endNight
33%17%23%19%5%
704
November1st to 15thNight
24%17%22%25%9%1
700
16th to endNight
27%17%23%20%8%2
734
December1st to 15thNight
30%19%28%17%4
750
16th to endNight
32%21%26%15%3
789
Page generated at 2017-09-19 07:32:33. Version ac04

Copyright 2017 A. Danko


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