Palgrave Conservation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Palgrave Conservation Area clear sky chart from 2005-11-05 to

2017-09-12
.

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%
14791
14%
46577
7%
14753
35%
14753
16%
32878

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
9%
719
8%
2465
1%
716
17%
716
5%
1998
January16th to endNight
15%
768
10%
2496
4%
768
22%
768
8%
1984
February1st to 15thNight
10%
701
10%
2287
1%
701
21%
701
8%
1782
February16th to endNight
15%
631
12%
2015
3%
631
26%
631
10%
1514
March1st to 15thNight
16%
720
13%
1980
5%
720
23%
720
13%
1492
March16th to endNight
23%
768
20%
2112
8%
768
34%
768
21%
1443
April1st to 15thNight
19%
718
14%
1828
4%
718
25%
718
19%
1330
April16th to endNight
29%
545
19%
1625
8%
545
38%
545
23%
1071
May1st to 15thNight
38%
501
17%
1581
10%
501
46%
501
24%
1045
May16th to endNight
38%
374
17%
1497
12%
374
52%
374
26%
831
June1st to 15thNight
38%
360
13%
1440
9%
360
50%
360
19%
864
June16th to endNight
45%
360
15%
1266
13%
360
53%
360
27%
730
July1st to 15thNight
54%
340
17%
1267
19%
340
62%
340
32%
659
July16th to endNight
50%
499
16%
1531
12%
467
56%
467
31%
890
August1st to 15thNight
53%
539
16%
1609
9%
536
58%
536
34%
931
August16th to endNight
50%
612
23%
1758
12%
612
57%
612
33%
1054
September1st to 15thNight
46%
707
20%
1790
8%
707
52%
707
34%
1143
September16th to endNight
47%
657
20%
1829
13%
657
52%
657
32%
1143
October1st to 15thNight
30%
660
16%
1980
11%
660
37%
660
20%
1371
October16th to endNight
17%
704
10%
2112
3%
704
25%
704
11%
1633
November1st to 15thNight
26%
700
17%
2381
14%
700
33%
700
16%
1655
November16th to endNight
20%
720
10%
2520
5%
720
28%
720
9%
1945
December1st to 15thNight
12%
720
5%
2520
2%
720
16%
720
6%
2069
December16th to endNight
8%
768
5%
2688
1%
768
13%
768
4%
2301

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
15%9%47%6%35%45%7%30%
48073
Night
14%8%47%6%35%45%6%34%
46755
Cloud CoverDay
14%9%47%6%35%45%7%30%
48083
Night
14%8%46%6%35%45%6%34%
46759
TransparencyDay
52%6%12%18%9%
47769
Night
49%7%12%19%10%1
46577
SeeingDay
18%16%30%20%10%4
5557
Night
18%16%31%22%9%1
14796

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
14%17%6%11%8%45%45%417%
1471
16th to endDay
11%17%7%13%9%45%45%6%14%
1728
February1st to 15thDay
12%16%7%11%9%47%44416%
1575
16th to endDay
17%14%5%9%6%3445%423%
1458
March1st to 15thDay
13%12%6%8%8%35%345%27%
1967
16th to endDay
13%12%5%6%5%4444434%
2112
April1st to 15thDay
18%12%45%5%2335%7%30%
2125
16th to endDay
18%9%36%422346%38%
2340
May1st to 15thDay
16%7%26%5%35%447%35%
2370
16th to endDay
12%5%26%5%35%5%6%7%39%
2618
June1st to 15thDay
16%6%344245%6%9%35%
2520
16th to endDay
13%425%5%35%5%6%9%36%
2690
July1st to 15thDay
9%425%6%36%6%5%9%39%
2610
16th to endDay
11%6%35%6%36%6%6%9%34%
2530
August1st to 15thDay
9%6%26%7%35%5%7%8%36%
2340
16th to endDay
12%5%25%6%36%5%6%8%35%
2432
September1st to 15thDay
15%6%35%6%34437%37%
2087
16th to endDay
15%5%36%6%3435%8%35%
1801
October1st to 15thDay
19%8%47%6%35%345%31%
1650
16th to endDay
27%13%5%7%6%33345%20%
1760
November1st to 15thDay
12%11%48%6%25%5%5%8%28%
1473
16th to endDay
16%14%7%9%7%346%5%6%18%
1440
December1st to 15thDay
16%16%8%11%8%45%346%14%
1440
16th to endDay
19%16%8%9%6%45%5%5%5%13%
1536
January1st to 15thNight
17%15%6%10%6%45%5%4419%
2465
16th to endNight
11%11%6%10%9%47%5%5%6%19%
2496
February1st to 15thNight
13%12%5%8%9%45%45%7%23%
2285
16th to endNight
10%12%5%9%8%46%45%6%26%
2015
March1st to 15thNight
16%9%5%9%6%34435%30%
1968
16th to endNight
12%8%46%6%24435%42%
2112
April1st to 15thNight
17%8%35%5%25%446%34%
1828
16th to endNight
12%9%35%5%2435%5%41%
1625
May1st to 15thNight
15%425%5%3445%8%39%
1581
16th to endNight
11%424424346%50%
1495
June1st to 15thNight
12%4245%36%5%5%8%41%
1440
16th to endNight
10%325%4245%5%8%47%
1266
July1st to 15thNight
6%223434445%57%
1344
16th to endNight
7%423435%5%6%7%48%
1637
August1st to 15thNight
5%4144245%7%8%49%
1620
16th to endNight
8%5%1442445%6%51%
1758
September1st to 15thNight
12%41432446%6%49%
1790
16th to endNight
13%42441345%7%48%
1829
October1st to 15thNight
18%6%36%5%3345%6%37%
1980
16th to endNight
20%9%47%6%35%5%5%6%24%
2112
November1st to 15thNight
15%8%36%6%25%45%6%33%
2381
16th to endNight
17%11%48%6%35%5%5%6%23%
2520
December1st to 15thNight
19%14%5%8%6%35%6%5%6%17%
2520
16th to endNight
19%14%8%12%8%35%44413%
2688

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%16%5%10%9%35%45%5%17%
1471
16th to endDay
11%16%8%11%9%45%45%6%15%
1728
February1st to 15thDay
13%15%7%10%9%47%44417%
1575
16th to endDay
17%14%5%9%5%35%45%423%
1458
March1st to 15thDay
14%11%5%8%8%45%35%5%27%
1978
16th to endDay
13%12%47%6%34345%34%
2111
April1st to 15thDay
18%12%46%5%2435%7%29%
2125
16th to endDay
18%8%35%423345%38%
2340
May1st to 15thDay
16%6%36%5%35%447%35%
2370
16th to endDay
11%5%35%6%445%5%8%39%
2618
June1st to 15thDay
15%6%245%2447%9%35%
2520
16th to endDay
13%425%5%35%5%6%10%35%
2690
July1st to 15thDay
9%435%6%36%6%5%9%39%
2610
16th to endDay
10%6%36%6%46%6%7%8%33%
2530
August1st to 15thDay
8%6%26%7%45%6%6%9%36%
2340
16th to endDay
12%5%25%6%46%6%7%9%34%
2432
September1st to 15thDay
15%6%26%5%35%45%7%37%
2087
16th to endDay
14%7%35%6%34448%36%
1801
October1st to 15thDay
19%8%37%6%34445%31%
1650
16th to endDay
27%12%37%6%34445%20%
1760
November1st to 15thDay
13%11%5%7%6%26%45%8%28%
1473
16th to endDay
16%14%7%9%6%45%5%5%7%18%
1440
December1st to 15thDay
16%17%7%13%8%45%335%15%
1440
16th to endDay
19%15%7%10%6%35%5%5%5%13%
1536
January1st to 15thNight
18%14%5%10%6%46%44419%
2465
16th to endNight
11%12%6%10%9%46%5%5%6%19%
2496
February1st to 15thNight
13%12%5%8%9%36%45%6%24%
2278
16th to endNight
11%13%49%8%45%5%5%6%25%
2015
March1st to 15thNight
17%9%48%7%34445%30%
1980
16th to endNight
13%8%35%5%24345%41%
2112
April1st to 15thNight
18%9%35%5%34446%34%
1828
16th to endNight
12%8%45%5%24346%41%
1625
May1st to 15thNight
14%4345%345%5%8%39%
1580
16th to endNight
11%325%32435%7%49%
1495
June1st to 15thNight
11%425%5%46%5%5%8%41%
1440
16th to endNight
9%425%4246%5%8%47%
1266
July1st to 15thNight
5%324424447%56%
1344
16th to endNight
7%423435%5%5%8%49%
1637
August1st to 15thNight
6%4144345%7%8%50%
1620
16th to endNight
8%4245%2445%6%52%
1758
September1st to 15thNight
12%4144235%5%6%48%
1790
16th to endNight
12%5%2442335%8%47%
1829
October1st to 15thNight
17%6%35%5%3335%6%37%
1980
16th to endNight
20%10%46%6%35%5%6%6%25%
2112
November1st to 15thNight
15%8%27%5%46%45%6%33%
2381
16th to endNight
18%10%48%6%35%5%5%7%24%
2520
December1st to 15thNight
19%14%5%8%7%36%5%5%6%18%
2520
16th to endNight
20%14%8%11%8%45%435%13%
2688

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
68%6%9%10%4
1472
16th to endDay
69%7%8%9%3
1728
February1st to 15thDay
68%7%7%12%2
1577
16th to endDay
62%6%9%13%7%1
1458
March1st to 15thDay
59%6%10%15%8%
1978
16th to endDay
52%5%8%17%13%1
2112
April1st to 15thDay
54%410%19%11%
2125
16th to endDay
46%411%20%14%1
2340
May1st to 15thDay
48%6%9%21%12%
2370
16th to endDay
41%6%14%21%13%1
2622
June1st to 15thDay
43%7%14%22%12%
2520
16th to endDay
42%7%15%22%12%
2690
July1st to 15thDay
39%7%12%22%15%1
2458
16th to endDay
45%7%13%21%10%1
2373
August1st to 15thDay
43%6%16%19%12%1
2327
16th to endDay
43%6%15%23%9%1
2432
September1st to 15thDay
46%6%13%22%9%1
2087
16th to endDay
46%5%12%25%9%
1801
October1st to 15thDay
54%5%10%19%9%
1650
16th to endDay
65%6%13%10%4
1760
November1st to 15thDay
52%8%13%17%8%
1473
16th to endDay
63%8%12%10%4
1440
December1st to 15thDay
72%6%11%7%2
1440
16th to endDay
70%7%10%8%2
1536
January1st to 15thNight
66%6%9%10%6%
2465
16th to endNight
61%9%11%12%3
2496
February1st to 15thNight
59%8%9%16%5%
2287
16th to endNight
56%7%12%15%7%
2015
March1st to 15thNight
56%5%11%18%7%
1980
16th to endNight
45%410%21%15%2
2112
April1st to 15thNight
50%411%18%14%
1828
16th to endNight
43%5%10%20%17%2
1625
May1st to 15thNight
42%6%10%23%15%1
1581
16th to endNight
34%5%14%27%14%2
1497
June1st to 15thNight
39%6%11%23%16%1
1440
16th to endNight
33%7%13%28%16%
1266
July1st to 15thNight
27%6%10%29%22%2
1267
16th to endNight
32%7%14%27%15%2
1531
August1st to 15thNight
29%7%19%28%14%1
1609
16th to endNight
32%6%11%30%17%1
1758
September1st to 15thNight
33%7%14%29%13%
1790
16th to endNight
35%5%14%32%11%
1829
October1st to 15thNight
46%6%10%22%12%1
1980
16th to endNight
56%9%12%14%6%
2112
November1st to 15thNight
49%7%12%19%10%1
2381
16th to endNight
59%8%13%14%3
2520
December1st to 15thNight
63%10%12%9%2
2520
16th to endNight
72%7%9%8%2
2688

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
16%40%28%10%4
67
16th to endDay
30%31%27%10%1
96
February1st to 15thDay
26%40%25%6%1
90
16th to endDay
29%38%28%3
81
March1st to 15thDay
20%27%29%16%5%
268
16th to endDay
23%17%33%15%8%1
288
April1st to 15thDay
24%22%29%14%8%1
270
16th to endDay
22%21%27%14%9%4
270
May1st to 15thDay
22%13%30%18%9%5%
288
16th to endDay
14%17%31%22%11%2
331
June1st to 15thDay
20%13%31%21%11%
315
16th to endDay
14%14%36%24%8%2
485
July1st to 15thDay
11%9%31%28%11%6%
392
16th to endDay
10%8%32%28%13%6%
326
August1st to 15thDay
9%6%29%27%16%10%
313
16th to endDay
15%8%22%25%17%12%
332
September1st to 15thDay
11%8%30%24%12%12%
299
16th to endDay
17%7%22%25%17%8%
254
October1st to 15thDay
18%15%31%18%11%4
255
16th to endDay
30%23%27%16%2
272
November1st to 15thDay
12%19%37%25%22
81
16th to endDay
21%25%40%10%3
60
December1st to 15thDay
23%36%26%11%1
60
16th to endDay
32%43%21%1
64
January1st to 15thNight
26%28%31%10%3
720
16th to endNight
17%21%36%20%4
768
February1st to 15thNight
20%27%35%14%2
704
16th to endNight
19%22%37%16%3
631
March1st to 15thNight
23%24%32%17%2
720
16th to endNight
18%19%35%18%8%
768
April1st to 15thNight
23%19%34%18%3
718
16th to endNight
16%14%34%24%8%
545
May1st to 15thNight
16%9%28%30%12%2
501
16th to endNight
11%8%37%27%14%
375
June1st to 15thNight
13%10%31%33%10%
360
16th to endNight
11%433%34%15%
360
July1st to 15thNight
5%5%29%40%17%1
340
16th to endNight
9%5%30%35%16%1
499
August1st to 15thNight
7%327%37%21%2
539
16th to endNight
11%427%29%23%2
612
September1st to 15thNight
13%9%26%25%18%6%
707
16th to endNight
15%7%24%30%17%3
657
October1st to 15thNight
21%12%30%21%12%1
660
16th to endNight
25%21%31%17%4
704
November1st to 15thNight
20%17%30%21%8%1
700
16th to endNight
23%22%28%19%5%
720
December1st to 15thNight
27%26%29%14%2
720
16th to endNight
27%22%32%13%2
768
Page generated at 2017-09-13 07:39:06. Version ac04

Copyright 2017 A. Danko


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