Martis Creek Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Martis Creek Campground 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
46%
15146
25%
46815
18%
15117
55%
15117
31%
25980

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
43%
717
18%
2506
14%
716
50%
716
21%
1520
January16th to endNight
37%
768
21%
2523
16%
768
47%
768
21%
1545
February1st to 15thNight
35%
700
19%
2241
16%
700
42%
700
19%
1418
February16th to endNight
37%
632
22%
1895
15%
632
46%
632
22%
1222
March1st to 15thNight
36%
720
15%
2112
9%
720
44%
720
21%
1370
March16th to endNight
31%
768
17%
2023
9%
768
38%
768
22%
1322
April1st to 15thNight
35%
719
18%
1799
7%
719
40%
719
24%
1235
April16th to endNight
38%
720
20%
1800
7%
720
43%
720
30%
1107
May1st to 15thNight
40%
545
25%
1625
12%
545
51%
545
33%
857
May16th to endNight
47%
374
21%
1496
18%
374
55%
374
24%
766
June1st to 15thNight
50%
360
26%
1440
24%
360
63%
360
32%
653
June16th to endNight
56%
360
32%
1440
29%
360
74%
360
46%
524
July1st to 15thNight
72%
340
33%
1360
37%
340
80%
340
55%
461
July16th to endNight
69%
421
38%
1458
36%
396
81%
396
55%
552
August1st to 15thNight
65%
604
33%
1677
21%
601
71%
601
53%
820
August16th to endNight
67%
764
42%
1910
21%
764
73%
764
65%
890
September1st to 15thNight
70%
706
40%
1765
24%
706
75%
706
67%
829
September16th to endNight
59%
656
40%
1771
25%
656
71%
656
52%
853
October1st to 15thNight
53%
660
29%
1969
23%
660
63%
660
40%
1009
October16th to endNight
53%
704
31%
2134
23%
704
66%
704
39%
1071
November1st to 15thNight
51%
700
25%
2275
23%
700
57%
700
31%
1253
November16th to endNight
37%
720
24%
2388
17%
720
47%
720
24%
1348
December1st to 15thNight
34%
720
17%
2520
12%
720
43%
720
17%
1588
December16th to endNight
28%
768
20%
2688
14%
768
38%
768
15%
1767

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
36%24323346%58%
47853
Night
25%2442445%6%56%
46992
TransparencyDay
26%5%10%19%22%15%
47529
Night
27%6%11%20%21%12%
46816
SeeingDay
14%25%28%19%9%2
5749
Night
9%24%16%23%20%5%
15155

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
37%37%5%3446%6%46%
1432
16th to endDay
412%5%6%4245%46%42%
1700
February1st to 15thDay
38%46%5%3445%6%46%
1622
16th to endDay
212%6%7%5%2436%7%41%
1579
March1st to 15thDay
211%6%7%5%35%447%40%
1847
16th to endDay
211%45%5%345%5%8%41%
2199
April1st to 15thDay
411%46%5%25%45%7%41%
2149
16th to endDay
49%4441325%6%53%
2160
May1st to 15thDay
45%1332235%7%59%
2320
16th to endDay
7%7%35%5%24346%49%
2615
June1st to 15thDay
5%424324346%58%
2520
16th to endDay
11111222478%
2520
July1st to 15thDay
1121223478%
2520
16th to endDay
211111223477%
2609
August1st to 15thDay
11221223476%
2274
16th to endDay
11111223381%
2292
September1st to 15thDay
111211235%77%
2114
16th to endDay
32122235%74%
1857
October1st to 15thDay
45%2421345%461%
1658
16th to endDay
35%13422346%60%
1737
November1st to 15thDay
45%24325%5%5%7%52%
1584
16th to endDay
27%45%42346%9%49%
1569
December1st to 15thDay
29%5%7%6%35%47%7%39%
1440
16th to endDay
410%5%7%6%35%446%40%
1536
January1st to 15thNight
26%46%5%35%6%6%9%44%
2506
16th to endNight
29%45%5%35%5%6%6%45%
2523
February1st to 15thNight
17%37%5%46%5%7%9%40%
2230
16th to endNight
210%5%6%5%245%5%8%43%
1895
March1st to 15thNight
19%46%5%35%5%6%8%41%
2112
16th to endNight
28%35%5%3446%7%47%
2023
April1st to 15thNight
38%45%5%36%6%7%8%41%
1799
16th to endNight
47%34323436%55%
1800
May1st to 15thNight
3413324346%62%
1625
16th to endNight
47%33333348%53%
1496
June1st to 15thNight
3314313336%65%
1440
16th to endNight
111221222378%
1440
July1st to 15thNight
11111222478%
1440
16th to endNight
21112222378%
1557
August1st to 15thNight
221231233373%
1686
16th to endNight
11111124479%
1910
September1st to 15thNight
111111125%80%
1765
16th to endNight
221221223375%
1771
October1st to 15thNight
4314322336%64%
1969
16th to endNight
3413223348%63%
2134
November1st to 15thNight
441333446%8%54%
2275
16th to endNight
16%35%42345%8%52%
2388
December1st to 15thNight
35%46%6%36%5%6%8%43%
2520
16th to endNight
210%5%7%6%45%447%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%9%14%24%13%2
1432
16th to endDay
41%6%11%16%15%8%
1700
February1st to 15thDay
37%6%15%21%14%4
1622
16th to endDay
41%5%14%24%11%2
1579
March1st to 15thDay
43%8%14%15%14%3
1847
16th to endDay
38%9%19%18%10%3
2199
April1st to 15thDay
41%6%15%20%13%2
2149
16th to endDay
32%5%14%26%19%2
2160
May1st to 15thDay
23%413%32%22%3
2320
16th to endDay
36%5%11%22%20%4
2619
June1st to 15thDay
25%5%8%20%25%13%
2520
16th to endDay
11%25%17%37%26%
2520
July1st to 15thDay
10%2410%25%47%
2371
16th to endDay
12%2310%22%47%
2446
August1st to 15thDay
13%2410%24%43%
2258
16th to endDay
9%2310%37%36%
2292
September1st to 15thDay
12%1412%35%33%
2114
16th to endDay
14%26%24%33%18%
1857
October1st to 15thDay
23%49%25%27%9%
1658
16th to endDay
24%5%12%25%23%9%
1737
November1st to 15thDay
30%7%13%23%17%7%
1584
16th to endDay
29%8%13%25%20%2
1569
December1st to 15thDay
40%9%13%21%14%
1440
16th to endDay
44%8%11%14%18%2
1536
January1st to 15thNight
34%10%13%21%16%3
2506
16th to endNight
37%6%13%15%16%10%
2523
February1st to 15thNight
38%8%13%21%13%5%
2241
16th to endNight
37%8%13%24%12%3
1895
March1st to 15thNight
37%9%14%18%13%6%
2112
16th to endNight
33%10%18%21%12%3
2023
April1st to 15thNight
38%9%16%22%11%1
1799
16th to endNight
29%6%18%25%16%2
1800
May1st to 15thNight
22%5%12%30%23%4
1626
16th to endNight
28%6%14%28%16%4
1496
June1st to 15thNight
22%5%8%25%25%12%
1440
16th to endNight
12%26%17%35%25%
1440
July1st to 15thNight
10%249%28%44%
1360
16th to endNight
11%249%23%48%
1458
August1st to 15thNight
16%3313%24%38%
1677
16th to endNight
9%2413%37%33%
1910
September1st to 15thNight
9%25%13%38%31%
1765
16th to endNight
14%26%22%34%18%
1771
October1st to 15thNight
22%310%28%26%8%
1969
16th to endNight
20%5%11%25%30%6%
2134
November1st to 15thNight
26%8%13%25%18%7%
2275
16th to endNight
29%7%11%25%20%5%
2388
December1st to 15thNight
37%10%13%21%15%2
2520
16th to endNight
42%9%10%16%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
40%18%26%10%31
60
16th to endDay
24%28%16%17%9%2
228
February1st to 15thDay
17%31%22%19%8%
245
16th to endDay
22%28%27%15%5%
238
March1st to 15thDay
24%36%15%11%8%2
270
16th to endDay
22%36%19%16%4
288
April1st to 15thDay
24%30%25%12%6%
269
16th to endDay
17%37%27%12%41
270
May1st to 15thDay
15%34%24%19%41
288
16th to endDay
18%25%22%17%11%3
330
June1st to 15thDay
16%26%28%19%7%1
315
16th to endDay
5%23%35%22%8%4
315
July1st to 15thDay
318%37%27%11%1
305
16th to endDay
121%37%25%9%4
327
August1st to 15thDay
5%20%38%22%9%3
315
16th to endDay
215%36%24%16%5%
332
September1st to 15thDay
6%15%35%25%15%2
300
16th to endDay
9%16%32%24%15%1
255
October1st to 15thDay
11%26%26%20%12%3
255
16th to endDay
19%24%26%15%12%
249
November1st to 15thDay
12%14%18%13%35%5%
90
16th to endDay
14%34%14%27%8%
81
December1st to 15thDay
28%33%23%10%5%
60
16th to endDay
25%17%23%21%9%3
64
January1st to 15thNight
9%25%17%23%16%8%
720
16th to endNight
11%27%19%20%15%5%
768
February1st to 15thNight
13%27%19%21%14%4
704
16th to endNight
14%27%17%21%13%5%
632
March1st to 15thNight
15%29%16%18%16%4
720
16th to endNight
13%35%18%16%14%1
768
April1st to 15thNight
12%31%19%22%13%1
719
16th to endNight
11%30%17%20%14%4
720
May1st to 15thNight
7%29%20%22%15%3
546
16th to endNight
8%24%16%22%22%5%
375
June1st to 15thNight
5%23%16%27%23%3
360
16th to endNight
322%16%30%26%1
360
July1st to 15thNight
112%10%37%35%2
340
16th to endNight
217%8%31%33%5%
421
August1st to 15thNight
312%15%32%31%5%
604
16th to endNight
112%16%33%30%5%
764
September1st to 15thNight
112%14%29%34%7%
706
16th to endNight
5%17%15%24%27%10%
656
October1st to 15thNight
9%17%15%25%22%8%
660
16th to endNight
11%17%15%25%21%9%
704
November1st to 15thNight
8%22%15%22%23%7%
700
16th to endNight
12%31%16%19%16%4
720
December1st to 15thNight
16%28%18%20%13%3
720
16th to endNight
15%30%22%17%10%3
768
Page generated at 2017-09-13 04:39:16. Version ac04

Copyright 2017 A. Danko


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