Monte Cristo's Castle
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Monte Cristo's Castle 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
70%
15316
32%
46860
27%
15290
75%
15290
50%
22623

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
74%
716
26%
2506
26%
716
80%
716
45%
1189
January16th to endNight
69%
768
27%
2577
28%
768
73%
768
38%
1348
February1st to 15thNight
69%
699
29%
2112
28%
699
74%
699
47%
1051
February16th to endNight
64%
632
30%
1895
30%
632
71%
632
45%
982
March1st to 15thNight
68%
720
31%
2160
27%
720
75%
720
50%
1050
March16th to endNight
58%
768
32%
2015
19%
768
67%
768
52%
1052
April1st to 15thNight
57%
719
29%
1799
14%
719
64%
719
48%
993
April16th to endNight
55%
703
31%
1783
15%
703
61%
703
50%
960
May1st to 15thNight
52%
539
32%
1619
21%
539
58%
539
46%
771
May16th to endNight
54%
495
26%
1619
19%
495
62%
495
37%
822
June1st to 15thNight
65%
360
30%
1440
31%
360
76%
360
43%
604
June16th to endNight
78%
360
35%
1440
42%
360
85%
360
61%
503
July1st to 15thNight
82%
340
26%
1360
32%
340
85%
340
42%
586
July16th to endNight
77%
397
30%
1436
34%
374
79%
374
38%
684
August1st to 15thNight
76%
673
34%
1747
23%
670
78%
670
60%
874
August16th to endNight
82%
764
40%
1910
25%
764
82%
764
65%
955
September1st to 15thNight
82%
720
39%
1827
27%
720
86%
720
65%
916
September16th to endNight
78%
671
42%
1856
36%
671
84%
671
66%
840
October1st to 15thNight
74%
660
37%
1853
31%
660
80%
660
57%
899
October16th to endNight
77%
704
41%
2200
39%
704
84%
704
61%
939
November1st to 15thNight
79%
700
37%
2275
38%
700
84%
700
61%
958
November16th to endNight
76%
720
35%
2340
34%
720
82%
720
53%
1060
December1st to 15thNight
70%
720
27%
2403
24%
720
76%
720
43%
1194
December16th to endNight
62%
768
26%
2688
26%
768
68%
768
37%
1393

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
1213323347%66%
47974
Night
2313323347%64%
47034
TransparencyDay
17%37%20%25%24%
47647
Night
18%49%23%25%18%
46861
SeeingDay
5%11%22%28%22%9%
5696
Night
3415%42%30%3
15328

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
132442445%12%54%
1432
16th to endDay
1424425%5%7%10%50%
1643
February1st to 15thDay
142441345%10%56%
1751
16th to endDay
25%2331235%9%58%
1579
March1st to 15thDay
121331346%10%61%
1800
16th to endDay
131332446%9%58%
2208
April1st to 15thDay
3324324346%60%
2149
16th to endDay
1212223346%67%
2175
May1st to 15thDay
2213323345%67%
2331
16th to endDay
24135%2445%7%58%
2492
June1st to 15thDay
3213312246%66%
2520
16th to endDay
111221122379%
2520
July1st to 15thDay
231231345%5%65%
2520
16th to endDay
2212323346%65%
2636
August1st to 15thDay
11121123479%
2202
16th to endDay
111212335%76%
2292
September1st to 15thDay
11221233476%
2133
16th to endDay
1111112483%
1849
October1st to 15thDay
223212346%70%
1776
16th to endDay
2212212335%72%
1672
November1st to 15thDay
2313213348%67%
1584
16th to endDay
1112323348%66%
1620
December1st to 15thDay
121332445%8%61%
1554
16th to endDay
1334436%5%6%10%49%
1536
January1st to 15thNight
132322445%10%58%
2506
16th to endNight
141442445%9%54%
2577
February1st to 15thNight
1324323249%62%
2101
16th to endNight
241432436%8%58%
1895
March1st to 15thNight
122332345%8%63%
2160
16th to endNight
231221335%8%63%
2015
April1st to 15thNight
341322436%6%62%
1799
16th to endNight
3312322346%66%
1783
May1st to 15thNight
2213412446%66%
1619
16th to endNight
3414424435%60%
1618
June1st to 15thNight
22232345%6%63%
1440
16th to endNight
1221213478%
1440
July1st to 15thNight
21144245%5%7%61%
1440
16th to endNight
4313434446%59%
1533
August1st to 15thNight
231222243471%
1756
16th to endNight
112223246%71%
1910
September1st to 15thNight
113213346%71%
1827
16th to endNight
112212335%76%
1856
October1st to 15thNight
3212222346%68%
1853
16th to endNight
111121334474%
2200
November1st to 15thNight
1212112336%74%
2275
16th to endNight
1212313346%67%
2340
December1st to 15thNight
131432345%7%60%
2403
16th to endNight
25%35%42346%10%52%
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
21%6%17%33%19%2
1432
16th to endDay
26%7%15%25%19%5%
1643
February1st to 15thDay
21%415%29%21%6%
1751
16th to endDay
22%410%34%24%4
1579
March1st to 15thDay
16%412%32%27%7%
1800
16th to endDay
20%5%14%26%24%7%
2208
April1st to 15thDay
23%48%25%24%13%
2149
16th to endDay
16%48%25%32%13%
2175
May1st to 15thDay
18%3423%34%16%
2331
16th to endDay
23%45%21%28%16%
2495
June1st to 15thDay
18%2414%28%30%
2520
16th to endDay
12%116%21%56%
2520
July1st to 15thDay
19%329%15%49%
2371
16th to endDay
17%3212%19%44%
2470
August1st to 15thDay
10%129%18%57%
2187
16th to endDay
11%227%23%52%
2292
September1st to 15thDay
11%2310%22%49%
2133
16th to endDay
8%1214%39%34%
1849
October1st to 15thDay
14%3421%39%17%
1776
16th to endDay
13%3424%37%15%
1672
November1st to 15thDay
16%410%33%27%8%
1584
16th to endDay
15%412%31%31%4
1620
December1st to 15thDay
19%6%16%34%21%2
1554
16th to endDay
27%8%19%25%15%2
1536
January1st to 15thNight
19%5%17%30%21%4
2506
16th to endNight
23%7%13%25%21%7%
2577
February1st to 15thNight
21%313%31%22%8%
2112
16th to endNight
22%5%12%32%23%4
1895
March1st to 15thNight
18%410%31%24%10%
2160
16th to endNight
18%411%33%23%8%
2015
April1st to 15thNight
21%410%27%28%8%
1799
16th to endNight
19%48%26%29%11%
1783
May1st to 15thNight
18%45%23%32%15%
1620
16th to endNight
25%46%16%30%17%
1619
June1st to 15thNight
19%35%15%27%28%
1440
16th to endNight
11%127%25%51%
1440
July1st to 15thNight
20%45%11%12%46%
1360
16th to endNight
24%5%49%14%42%
1436
August1st to 15thNight
15%348%19%48%
1747
16th to endNight
13%3310%23%45%
1910
September1st to 15thNight
14%3313%19%45%
1827
16th to endNight
11%3312%32%37%
1856
October1st to 15thNight
16%3422%38%15%
1853
16th to endNight
12%3425%36%17%
2200
November1st to 15thNight
13%210%32%31%10%
2275
16th to endNight
17%310%27%32%8%
2340
December1st to 15thNight
21%6%15%32%22%2
2403
16th to endNight
26%5%17%29%17%3
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
5%325%46%11%8%
60
16th to endDay
6%6%16%32%22%15%
163
February1st to 15thDay
312%18%29%25%10%
266
16th to endDay
8%16%24%26%17%5%
238
March1st to 15thDay
417%25%25%18%8%
270
16th to endDay
9%21%26%22%17%3
288
April1st to 15thDay
11%24%22%20%15%5%
269
16th to endDay
10%28%25%21%10%3
270
May1st to 15thDay
8%15%31%21%16%6%
288
16th to endDay
6%14%21%27%20%9%
330
June1st to 15thDay
10%12%21%27%18%7%
315
16th to endDay
49%21%26%26%11%
315
July1st to 15thDay
5%5%19%32%25%11%
305
16th to endDay
2423%29%26%12%
327
August1st to 15thDay
3429%33%20%9%
315
16th to endDay
3321%29%25%17%
332
September1st to 15thDay
3420%28%27%15%
315
16th to endDay
48%18%27%28%12%
268
October1st to 15thDay
411%26%26%21%9%
255
16th to endDay
5%11%15%31%25%9%
184
November1st to 15thDay
136%21%45%22%
90
16th to endDay
28%8%51%22%6%
90
December1st to 15thDay
16%16%53%21%1
79
16th to endDay
1410%40%37%4
64
January1st to 15thNight
3113%45%29%6%
720
16th to endNight
3215%48%26%4
768
February1st to 15thNight
3314%46%28%3
704
16th to endNight
45%18%49%19%2
632
March1st to 15thNight
2417%46%25%3
720
16th to endNight
48%24%39%22%1
768
April1st to 15thNight
5%9%22%40%21%1
719
16th to endNight
5%10%23%35%20%3
703
May1st to 15thNight
413%23%35%22%
540
16th to endNight
5%9%22%35%25%2
497
June1st to 15thNight
35%20%43%26%1
360
16th to endNight
1112%55%28%
360
July1st to 15thNight
16%48%42%
340
16th to endNight
5%6%42%44%1
397
August1st to 15thNight
3212%42%38%1
673
16th to endNight
119%35%46%4
764
September1st to 15thNight
317%38%44%5%
720
16th to endNight
1312%33%42%6%
671
October1st to 15thNight
3214%42%31%5%
660
16th to endNight
3213%39%35%5%
704
November1st to 15thNight
3111%42%35%5%
700
16th to endNight
3112%47%30%4
720
December1st to 15thNight
3314%54%19%5%
720
16th to endNight
3218%48%23%2
768
Page generated at 2017-09-20 01:49:44. Version ac04

Copyright 2017 A. Danko


Monte Cristo's Castle Clear Sky Chart | Charts Home