Peddler Hill
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Peddler Hill clear sky chart from 2005-11-05 to 2017-09-19.

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
59%
15257
28%
46878
23%
15220
66%
15220
37%
25581

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
48%
718
20%
2503
17%
716
56%
716
27%
1435
January16th to endNight
43%
768
25%
2496
17%
768
55%
768
24%
1536
February1st to 15thNight
45%
700
24%
2223
18%
696
55%
696
25%
1369
February16th to endNight
47%
632
24%
1895
19%
632
55%
632
26%
1214
March1st to 15thNight
44%
720
17%
2100
13%
720
51%
720
26%
1387
March16th to endNight
45%
768
19%
2028
12%
768
51%
768
27%
1336
April1st to 15thNight
47%
719
19%
1799
9%
719
51%
719
27%
1246
April16th to endNight
53%
720
23%
1800
11%
720
58%
720
37%
1110
May1st to 15thNight
59%
584
27%
1664
17%
584
65%
584
46%
845
May16th to endNight
68%
374
23%
1496
28%
374
70%
374
35%
707
June1st to 15thNight
71%
360
27%
1440
31%
360
78%
360
43%
625
June16th to endNight
82%
360
35%
1440
45%
360
87%
360
62%
495
July1st to 15thNight
90%
340
34%
1360
44%
340
92%
340
67%
455
July16th to endNight
86%
454
38%
1488
39%
426
87%
426
62%
585
August1st to 15thNight
83%
613
35%
1686
26%
610
84%
610
66%
785
August16th to endNight
85%
764
43%
1910
27%
764
86%
764
76%
886
September1st to 15thNight
86%
720
43%
1800
29%
720
89%
720
78%
827
September16th to endNight
76%
671
42%
1805
34%
671
81%
671
65%
840
October1st to 15thNight
61%
660
31%
1972
27%
660
69%
660
43%
1018
October16th to endNight
65%
704
35%
2117
31%
704
74%
704
47%
1053
November1st to 15thNight
62%
700
30%
2275
28%
700
69%
700
37%
1217
November16th to endNight
50%
720
28%
2373
23%
720
59%
720
31%
1331
December1st to 15thNight
46%
720
22%
2520
16%
720
56%
720
22%
1542
December16th to endNight
37%
768
22%
2688
16%
768
48%
768
18%
1737

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
8%7%23212335%59%
47933
Night
8%6%23213345%58%
47069
TransparencyDay
28%37%19%24%16%
47611
Night
28%37%19%24%15%
46890
SeeingDay
14%18%34%19%8%3
5825
Night
12%7%14%32%26%6%
15265

By Month

Percentage Cloud Cover SW (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
12%9%23323346%49%
1432
16th to endDay
14%14%32223336%44%
1728
February1st to 15thDay
13%10%33314337%46%
1628
16th to endDay
13%16%5%4313336%38%
1579
March1st to 15thDay
11%16%5%5%32435%6%35%
1857
16th to endDay
12%14%44324347%38%
2194
April1st to 15thDay
12%16%34313345%40%
2149
16th to endDay
13%8%22212336%53%
2160
May1st to 15thDay
8%5%23212347%59%
2283
16th to endDay
12%8%1431334451%
2615
June1st to 15thDay
7%5%23213335%62%
2520
16th to endDay
21111122379%
2520
July1st to 15thDay
112223381%
2520
16th to endDay
21111122381%
2577
August1st to 15thDay
11211223280%
2265
16th to endDay
11111222381%
2292
September1st to 15thDay
11121222379%
2160
16th to endDay
421111223373%
1899
October1st to 15thDay
8%313312346%59%
1656
16th to endDay
8%5%1222233462%
1754
November1st to 15thDay
8%6%22323447%53%
1584
16th to endDay
9%9%23313345%51%
1585
December1st to 15thDay
15%7%45%314345%44%
1440
16th to endDay
16%12%43323236%40%
1536
January1st to 15thNight
11%8%24323447%47%
2503
16th to endNight
12%11%23323346%46%
2496
February1st to 15thNight
13%9%25%323347%43%
2223
16th to endNight
11%12%4431335%5%44%
1895
March1st to 15thNight
12%12%5%4322445%42%
2100
16th to endNight
12%12%2232335%6%44%
2028
April1st to 15thNight
11%11%44433445%42%
1799
16th to endNight
9%7%23213345%55%
1800
May1st to 15thNight
6%41223447%63%
1664
16th to endNight
7%6%2221225%6%58%
1496
June1st to 15thNight
5%41121223468%
1440
16th to endNight
2111222282%
1440
July1st to 15thNight
11111212283%
1440
16th to endNight
321111222279%
1590
August1st to 15thNight
22221223277%
1695
16th to endNight
1111122382%
1910
September1st to 15thNight
111122483%
1800
16th to endNight
31121122477%
1805
October1st to 15thNight
6%412212335%64%
1972
16th to endNight
7%22113346%64%
2117
November1st to 15thNight
8%5%12314347%57%
2275
16th to endNight
8%8%23324345%53%
2373
December1st to 15thNight
15%7%34324347%44%
2520
16th to endNight
18%11%43323345%40%
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
36%49%20%20%8%
1432
16th to endDay
42%37%16%17%11%
1728
February1st to 15thDay
40%39%19%18%8%
1628
16th to endDay
49%37%23%14%2
1579
March1st to 15thDay
48%5%10%14%15%6%
1857
16th to endDay
45%5%14%18%12%3
2194
April1st to 15thDay
44%412%19%15%3
2149
16th to endDay
32%414%25%18%4
2160
May1st to 15thDay
24%312%33%22%4
2283
16th to endDay
35%5%10%26%17%4
2619
June1st to 15thDay
25%410%22%23%13%
2520
16th to endDay
11%2317%39%26%
2520
July1st to 15thDay
8%2210%29%46%
2371
16th to endDay
10%2412%25%44%
2416
August1st to 15thDay
10%3212%32%38%
2249
16th to endDay
10%1214%41%30%
2292
September1st to 15thDay
11%1314%39%28%
2160
16th to endDay
15%3426%33%17%
1899
October1st to 15thDay
24%37%23%27%13%
1656
16th to endDay
25%38%22%26%13%
1754
November1st to 15thDay
30%410%23%20%9%
1584
16th to endDay
35%38%19%27%5%
1585
December1st to 15thDay
42%48%20%18%5%
1440
16th to endDay
46%47%14%17%9%
1536
January1st to 15thNight
35%49%20%19%10%
2503
16th to endNight
40%46%14%17%17%
2496
February1st to 15thNight
39%47%21%17%10%
2234
16th to endNight
42%38%21%19%4
1895
March1st to 15thNight
43%410%15%18%8%
2100
16th to endNight
39%6%12%19%17%5%
2028
April1st to 15thNight
42%6%10%21%14%4
1799
16th to endNight
30%6%11%28%19%4
1800
May1st to 15thNight
19%411%31%26%6%
1665
16th to endNight
25%413%29%20%6%
1496
June1st to 15thNight
20%310%22%27%15%
1440
16th to endNight
9%2418%36%29%
1440
July1st to 15thNight
9%129%29%47%
1360
16th to endNight
11%3311%23%46%
1488
August1st to 15thNight
12%3213%29%38%
1686
16th to endNight
8%2214%38%34%
1910
September1st to 15thNight
7%2314%40%31%
1800
16th to endNight
12%2327%34%19%
1805
October1st to 15thNight
23%35%25%27%13%
1972
16th to endNight
20%38%22%31%13%
2117
November1st to 15thNight
27%48%23%23%12%
2275
16th to endNight
32%46%23%24%9%
2373
December1st to 15thNight
40%5%8%18%20%7%
2520
16th to endNight
46%37%12%19%11%
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
48%11%23%8%5%3
60
16th to endDay
26%15%23%20%9%3
256
February1st to 15thDay
24%17%26%18%11%2
245
16th to endDay
28%18%29%15%5%1
238
March1st to 15thDay
28%26%18%14%10%1
270
16th to endDay
26%23%28%14%7%
288
April1st to 15thDay
28%24%24%15%6%
269
16th to endDay
22%26%30%16%31
270
May1st to 15thDay
15%26%32%15%6%3
288
16th to endDay
23%19%24%17%10%5%
330
June1st to 15thDay
13%19%39%17%6%3
315
16th to endDay
316%44%21%6%6%
315
July1st to 15thDay
29%52%20%7%7%
305
16th to endDay
211%50%22%8%5%
327
August1st to 15thDay
318%47%17%8%4
315
16th to endDay
9%48%25%9%6%
332
September1st to 15thDay
114%44%25%9%3
315
16th to endDay
8%12%40%30%6%1
268
October1st to 15thDay
9%21%35%23%6%3
255
16th to endDay
15%21%29%23%9%
266
November1st to 15thDay
10%14%13%21%33%7%
90
16th to endDay
19%25%19%25%9%2
84
December1st to 15thDay
25%23%30%11%6%3
60
16th to endDay
21%9%23%21%18%4
64
January1st to 15thNight
17%9%18%27%18%7%
720
16th to endNight
19%12%19%25%17%5%
768
February1st to 15thNight
19%9%17%31%17%5%
704
16th to endNight
22%8%17%28%18%4
632
March1st to 15thNight
21%8%19%28%19%3
720
16th to endNight
19%10%20%28%17%3
768
April1st to 15thNight
17%9%17%33%18%3
719
16th to endNight
13%10%16%30%23%5%
720
May1st to 15thNight
10%8%17%34%24%4
585
16th to endNight
9%6%8%34%35%5%
375
June1st to 15thNight
6%5%12%37%34%4
360
16th to endNight
318%44%39%3
360
July1st to 15thNight
336%54%4
340
16th to endNight
215%28%50%11%
454
August1st to 15thNight
28%40%40%6%
613
16th to endNight
27%40%42%6%
764
September1st to 15thNight
28%38%41%8%
720
16th to endNight
3313%35%32%12%
671
October1st to 15thNight
9%8%15%30%26%9%
660
16th to endNight
9%7%13%30%26%12%
704
November1st to 15thNight
11%6%14%35%25%7%
700
16th to endNight
14%11%19%28%18%7%
720
December1st to 15thNight
20%8%17%33%14%5%
720
16th to endNight
27%12%15%26%15%2
768
Page generated at 2017-09-20 01:49:45. Version ac04

Copyright 2017 A. Danko


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