Peddler Hill
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Peddler Hill clear sky chart from 2005-11-06 to 2024-01-13.

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
54%
23470
29%
74657
21%
23423
64%
23423
37%
40258

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 10thNight
38%
758
21%
2646
14%
756
50%
756
23%
1592
January11th to 20thNight
40%
732
24%
2466
16%
732
53%
732
25%
1457
January21st to endNight
38%
792
27%
2574
16%
792
53%
792
23%
1588
February1st to 10thNight
38%
720
25%
2340
17%
720
52%
720
25%
1381
February11th to 20thNight
43%
700
27%
2100
20%
700
54%
700
27%
1267
February21st to endNight
39%
592
25%
1776
16%
592
51%
592
26%
1117
March1st to 10thNight
34%
720
17%
2160
10%
720
44%
720
21%
1466
March11th to 20thNight
41%
720
21%
1980
13%
720
50%
720
27%
1285
March21st to endNight
37%
792
18%
2054
8%
792
45%
792
26%
1384
April1st to 10thNight
43%
720
22%
1800
8%
720
51%
720
31%
1179
April11th to 20thNight
44%
711
26%
1779
10%
711
52%
711
35%
1128
April21st to endNight
51%
720
26%
1800
11%
720
58%
720
42%
1059
May1st to 10thNight
52%
658
26%
1738
13%
658
59%
658
43%
967
May11th to 20thNight
62%
395
32%
1457
28%
395
70%
395
41%
667
May21st to endNight
63%
388
24%
1552
24%
388
70%
388
37%
716
June1st to 10thNight
66%
360
27%
1440
29%
360
74%
360
41%
639
June11th to 20thNight
70%
360
37%
1440
38%
360
83%
360
61%
502
June21st to endNight
72%
360
35%
1440
38%
360
84%
360
59%
504
July1st to 10thNight
84%
350
37%
1400
45%
350
90%
350
74%
431
July11th to 20thNight
79%
348
37%
1392
44%
348
84%
348
62%
486
July21st to endNight
80%
512
39%
1600
35%
484
84%
484
60%
670
August1st to 10thNight
78%
556
36%
1621
27%
553
81%
553
63%
733
August11th to 20thNight
78%
712
36%
1780
21%
712
81%
712
71%
864
August21st to endNight
81%
792
42%
1980
25%
792
84%
792
78%
911
September1st to 10thNight
81%
720
46%
1800
28%
720
86%
720
82%
804
September11th to 20thNight
75%
720
45%
1813
31%
720
82%
720
71%
861
September21st to endNight
67%
720
42%
1980
29%
720
79%
720
63%
917
October1st to 10thNight
61%
720
33%
2147
27%
720
72%
720
50%
1052
October11th to 20thNight
63%
720
39%
2160
32%
720
75%
720
52%
1008
October21st to endNight
60%
792
40%
2384
32%
792
74%
792
53%
1101
November1st to 10thNight
58%
740
30%
2405
26%
740
67%
740
37%
1292
November11th to 20thNight
49%
760
32%
2470
23%
760
64%
760
36%
1300
November21st to endNight
43%
760
30%
2522
22%
760
56%
760
32%
1378
December1st to 10thNight
40%
760
25%
2660
16%
760
54%
760
26%
1527
December11th to 20thNight
38%
760
21%
3219
16%
759
50%
759
15%
2189
December21st to endNight
30%
830
15%
4782
14%
817
45%
817
11%
2836

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
7%7%23323345%60%
74763
Night
8%7%23323346%58%
74985
TransparencyDay
27%48%19%25%18%
74474
Night
28%47%19%25%18%
74795
SeeingDay
14%17%33%23%10%3
13999
Night
13%8%20%33%21%5%
23483

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 10thDay
14%12%24435%35%6%42%
1519
11th to 20thDay
11%10%34323347%50%
1546
21st to endDay
12%15%4432345%8%42%
1782
February1st to 10thDay
14%10%34314336%48%
1620
11th to 20thDay
8%12%5%5%424347%47%
1746
21st to endDay
13%15%5%6%41333443%
1480
March1st to 10thDay
10%17%6%7%43445%5%34%
1800
11th to 20thDay
12%16%5%5%32445%7%38%
1975
21st to endDay
12%17%45%423347%38%
2301
April1st to 10thDay
12%12%35%32345%7%44%
2160
11th to 20thDay
10%12%44314346%49%
2129
21st to endDay
11%7%23213448%55%
2160
May1st to 10thDay
8%8%3332235%7%57%
2221
11th to 20thDay
8%8%24323446%56%
2431
21st to endDay
11%8%24424445%52%
2723
June1st to 10thDay
7%433323346%61%
2520
11th to 20thDay
3212222335%76%
2520
21st to endDay
321221233378%
2520
July1st to 10thDay
11121222386%
2520
11th to 20thDay
111121223481%
2520
21st to endDay
221221223478%
2620
August1st to 10thDay
221221233478%
2307
11th to 20thDay
111121223481%
2122
21st to endDay
111211212385%
2376
September1st to 10thDay
21121123384%
2160
11th to 20thDay
431231333473%
2145
21st to endDay
5%41211223474%
1980
October1st to 10thDay
8%413323336%64%
1810
11th to 20thDay
6%31332234469%
1800
21st to endDay
7%5%12323346%65%
1970
November1st to 10thDay
11%7%3333445%6%52%
1674
11th to 20thDay
9%6%2333445%6%56%
1710
21st to endDay
9%9%2432345%7%54%
1654
December1st to 10thDay
12%7%34425%447%49%
1520
11th to 20thDay
18%12%6%7%5%3435%5%33%
1928
21st to endDay
9%10%35%4346%6%10%40%
2794
January1st to 10thNight
13%11%25%42445%7%43%
2646
11th to 20thNight
9%10%34435%5%5%7%46%
2466
21st to endNight
11%12%345%3435%6%46%
2574
February1st to 10thNight
12%9%35%424346%50%
2340
11th to 20thNight
8%11%45%32345%7%46%
2100
21st to endNight
11%11%5%6%32234448%
1776
March1st to 10thNight
11%15%6%6%423445%41%
2160
11th to 20thNight
11%12%4432346%7%43%
1980
21st to endNight
11%13%3442345%7%43%
2054
April1st to 10thNight
11%9%4443345%7%47%
1800
11th to 20thNight
9%9%3442335%6%52%
1779
21st to endNight
8%7%1332345%6%58%
1800
May1st to 10thNight
6%5%24323446%61%
1738
11th to 20thNight
5%5%32323348%61%
1457
21st to endNight
7%6%2331335%7%60%
1552
June1st to 10thNight
6%5%13323345%66%
1440
11th to 20thNight
211111232482%
1440
21st to endNight
321122222380%
1440
July1st to 10thNight
1111222287%
1440
11th to 20thNight
221222223381%
1440
21st to endNight
321222333475%
1694
August1st to 10thNight
331221333376%
1630
11th to 20thNight
121221234378%
1780
21st to endNight
211121122384%
1980
September1st to 10thNight
21111112486%
1800
11th to 20thNight
321212225%79%
1813
21st to endNight
3212312335%76%
1980
October1st to 10thNight
6%5%1221233471%
2147
11th to 20thNight
5%313212345%71%
2160
21st to endNight
6%212113246%71%
2384
November1st to 10thNight
9%8%23313347%57%
2405
11th to 20thNight
7%5%13424448%57%
2470
21st to endNight
9%7%34323345%56%
2522
December1st to 10thNight
14%8%24323347%49%
2660
11th to 20thNight
18%13%46%5%3445%7%33%
3276
21st to endNight
10%11%46%6%35%5%5%7%37%
4862

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 10thDay
42%5%10%21%16%6%
1519
11th to 20thDay
36%29%19%21%14%
1546
21st to endDay
43%47%16%21%10%
1782
February1st to 10thDay
39%38%20%17%13%
1620
11th to 20thDay
38%47%19%23%9%
1756
21st to endDay
47%36%19%17%7%
1480
March1st to 10thDay
52%49%16%13%5%
1800
11th to 20thDay
46%49%18%17%6%
1975
21st to endDay
46%6%13%19%12%3
2301
April1st to 10thDay
40%414%20%18%4
2160
11th to 20thDay
36%6%11%23%18%6%
2132
21st to endDay
29%415%29%20%4
2160
May1st to 10thDay
27%412%29%22%5%
2221
11th to 20thDay
29%410%29%22%5%
2434
21st to endDay
33%7%11%28%17%5%
2724
June1st to 10thDay
25%5%10%25%27%8%
2520
11th to 20thDay
13%38%25%34%17%
2520
21st to endDay
11%3416%35%31%
2520
July1st to 10thDay
6%2212%29%48%
2451
11th to 20thDay
9%2416%28%42%
2445
21st to endDay
11%3412%28%42%
2474
August1st to 10thDay
11%3314%29%39%
2291
11th to 20thDay
8%3312%39%35%
2122
21st to endDay
8%1214%39%37%
2376
September1st to 10thDay
8%2210%37%41%
2160
11th to 20thDay
15%3422%38%18%
2145
21st to endDay
15%3422%35%21%
1980
October1st to 10thDay
22%36%16%30%22%
1810
11th to 20thDay
19%37%21%28%22%
1800
21st to endDay
21%37%20%28%21%
1970
November1st to 10thDay
32%47%22%22%13%
1674
11th to 20thDay
29%410%18%26%13%
1710
21st to endDay
31%47%20%27%12%
1654
December1st to 10thDay
36%48%18%21%12%
1520
11th to 20thDay
54%5%6%13%14%9%
1928
21st to endDay
38%5%13%19%16%8%
2794
January1st to 10thNight
40%49%22%18%7%
2646
11th to 20thNight
37%5%8%17%19%15%
2466
21st to endNight
41%46%14%20%15%
2574
February1st to 10thNight
37%36%18%20%15%
2340
11th to 20thNight
37%47%19%21%11%
2101
21st to endNight
40%46%22%20%8%
1776
March1st to 10thNight
48%49%14%19%6%
2160
11th to 20thNight
41%49%19%19%8%
1980
21st to endNight
41%6%11%20%16%5%
2054
April1st to 10thNight
37%6%12%20%18%7%
1800
11th to 20thNight
33%6%11%23%18%8%
1779
21st to endNight
26%6%11%35%19%5%
1800
May1st to 10thNight
23%6%11%28%26%6%
1738
11th to 20thNight
21%410%32%26%6%
1457
21st to endNight
23%6%15%31%21%5%
1552
June1st to 10thNight
21%411%24%29%11%
1440
11th to 20thNight
9%37%27%34%20%
1440
21st to endNight
11%2415%34%33%
1440
July1st to 10thNight
7%1211%32%48%
1400
11th to 20thNight
11%2412%26%45%
1392
21st to endNight
14%3412%24%44%
1600
August1st to 10thNight
13%3313%29%38%
1621
11th to 20thNight
9%4313%32%38%
1780
21st to endNight
8%2211%35%42%
1980
September1st to 10thNight
6%1210%36%45%
1800
11th to 20thNight
11%2423%38%22%
1813
21st to endNight
12%3323%35%24%
1980
October1st to 10thNight
19%35%18%31%23%
2147
11th to 20thNight
17%35%19%33%24%
2160
21st to endNight
16%37%20%34%20%
2384
November1st to 10thNight
29%47%20%23%17%
2405
11th to 20thNight
26%5%7%20%28%13%
2470
21st to endNight
31%35%20%24%16%
2522
December1st to 10thNight
37%37%17%21%15%
2660
11th to 20thNight
51%45%12%19%8%
3276
21st to endNight
44%5%10%14%17%9%
4862

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 10thDay
36%18%22%16%7%1
180
11th to 20thDay
24%14%25%21%12%3
254
21st to endDay
22%16%26%21%13%3
374
February1st to 10thDay
27%16%25%19%10%3
340
11th to 20thDay
21%23%30%18%8%1
413
21st to endDay
25%21%32%15%5%1
346
March1st to 10thDay
32%25%24%14%5%1
420
11th to 20thDay
28%22%22%16%10%1
420
21st to endDay
29%22%28%16%5%
462
April1st to 10thDay
22%23%30%17%7%1
420
11th to 20thDay
26%23%25%18%6%1
412
21st to endDay
16%20%29%22%10%4
420
May1st to 10thDay
17%22%29%20%8%4
423
11th to 20thDay
19%20%27%19%12%3
448
21st to endDay
19%16%25%22%15%4
485
June1st to 10thDay
11%17%34%21%11%6%
450
11th to 20thDay
8%23%36%21%9%4
450
21st to endDay
416%37%27%10%6%
450
July1st to 10thDay
29%52%20%11%5%
446
11th to 20thDay
19%44%30%11%6%
444
21st to endDay
38%43%27%13%7%
487
August1st to 10thDay
414%43%23%11%4
447
11th to 20thDay
211%41%29%11%6%
437
21st to endDay
38%46%28%12%3
495
September1st to 10thDay
310%46%26%14%2
450
11th to 20thDay
6%17%35%31%8%2
450
21st to endDay
8%14%36%34%6%1
450
October1st to 10thDay
8%20%29%32%9%2
450
11th to 20thDay
9%14%32%29%13%4
450
21st to endDay
11%17%29%26%13%4
485
November1st to 10thDay
20%14%20%24%17%5%
270
11th to 20thDay
14%13%26%28%11%7%
270
21st to endDay
14%16%28%23%14%4
243
December1st to 10thDay
21%16%24%18%14%7%
180
11th to 20thDay
17%21%27%18%14%3
180
21st to endDay
25%13%26%21%12%3
198
January1st to 10thNight
22%12%23%23%15%6%
760
11th to 20thNight
17%13%26%30%11%4
732
21st to endNight
21%12%24%23%16%4
792
February1st to 10thNight
20%12%22%28%15%3
720
11th to 20thNight
19%12%20%28%15%5%
704
21st to endNight
22%10%23%31%11%2
592
March1st to 10thNight
24%13%23%26%12%2
720
11th to 20thNight
20%10%23%24%19%4
720
21st to endNight
20%11%27%29%12%2
792
April1st to 10thNight
17%8%24%34%15%2
720
11th to 20thNight
15%12%23%31%15%4
711
21st to endNight
12%9%23%32%19%5%
720
May1st to 10thNight
10%10%24%32%21%4
658
11th to 20thNight
7%8%17%39%25%4
395
21st to endNight
10%5%17%35%29%4
389
June1st to 10thNight
7%417%40%28%4
360
11th to 20thNight
25%21%41%29%3
360
21st to endNight
3415%42%32%3
360
July1st to 10thNight
111%42%44%3
350
11th to 20thNight
2114%43%36%5%
348
21st to endNight
3110%31%44%11%
512
August1st to 10thNight
4112%44%34%5%
556
11th to 20thNight
2114%46%31%6%
712
21st to endNight
2111%48%35%3
792
September1st to 10thNight
2213%45%33%5%
720
11th to 20thNight
4316%38%31%8%
720
21st to endNight
45%21%36%26%8%
720
October1st to 10thNight
8%8%19%39%21%7%
720
11th to 20thNight
8%8%18%36%24%5%
720
21st to endNight
9%9%20%31%21%10%
792
November1st to 10thNight
14%7%17%36%21%6%
740
11th to 20thNight
13%9%25%33%16%5%
760
21st to endNight
15%12%25%29%15%4
760
December1st to 10thNight
20%10%23%30%12%4
760
11th to 20thNight
24%11%21%29%13%3
760
21st to endNight
25%14%23%25%11%2
836
Page generated at 2024-01-10 07:16:11. Version ac07

Copyright 2024 Attilla Danko


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