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 2005-11-06 to 2024-01-11.

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
50%
23335
27%
74637
20%
23296
59%
23296
35%
40479

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
39%
757
17%
2646
14%
756
47%
756
21%
1615
January11th to 20thNight
45%
724
21%
2482
16%
724
55%
724
25%
1457
January21st to endNight
41%
792
24%
2574
19%
792
50%
792
25%
1591
February1st to 10thNight
42%
720
22%
2340
17%
720
51%
720
27%
1379
February11th to 20thNight
41%
700
24%
2112
18%
700
52%
700
28%
1263
February21st to endNight
41%
592
22%
1776
17%
592
49%
592
24%
1113
March1st to 10thNight
34%
720
17%
2160
9%
720
44%
720
20%
1407
March11th to 20thNight
41%
720
20%
1998
15%
720
47%
720
27%
1281
March21st to endNight
33%
792
14%
2047
7%
792
39%
792
24%
1358
April1st to 10thNight
36%
720
20%
1800
8%
720
43%
720
27%
1196
April11th to 20thNight
40%
711
25%
1779
10%
711
47%
711
34%
1090
April21st to endNight
45%
720
21%
1800
8%
720
50%
720
40%
1061
May1st to 10thNight
43%
622
26%
1702
13%
622
51%
622
37%
964
May11th to 20thNight
52%
372
27%
1434
23%
372
61%
372
33%
702
May21st to endNight
56%
388
21%
1552
23%
388
63%
388
29%
793
June1st to 10thNight
58%
360
26%
1440
26%
360
67%
360
34%
674
June11th to 20thNight
59%
360
33%
1440
33%
360
74%
360
50%
522
June21st to endNight
67%
360
33%
1440
36%
360
79%
360
54%
528
July1st to 10thNight
72%
350
35%
1400
38%
350
84%
350
64%
462
July11th to 20thNight
68%
348
37%
1392
39%
348
78%
348
62%
466
July21st to endNight
75%
461
39%
1552
36%
436
83%
436
59%
613
August1st to 10thNight
72%
544
34%
1609
23%
541
78%
541
56%
761
August11th to 20thNight
69%
712
36%
1780
19%
712
74%
712
67%
862
August21st to endNight
64%
792
42%
1980
22%
792
69%
792
73%
911
September1st to 10thNight
69%
720
44%
1800
23%
720
77%
720
75%
826
September11th to 20thNight
65%
720
43%
1818
26%
720
74%
720
65%
869
September21st to endNight
61%
720
40%
1980
28%
720
73%
720
57%
940
October1st to 10thNight
59%
720
31%
2142
24%
720
70%
720
46%
1061
October11th to 20thNight
63%
720
37%
2160
33%
720
73%
720
53%
996
October21st to endNight
60%
792
36%
2412
32%
792
69%
792
49%
1131
November1st to 10thNight
54%
740
27%
2405
25%
740
60%
740
32%
1312
November11th to 20thNight
49%
760
27%
2470
20%
760
60%
760
35%
1288
November21st to endNight
47%
760
27%
2547
22%
760
57%
760
31%
1382
December1st to 10thNight
44%
760
21%
2660
16%
760
54%
760
25%
1536
December11th to 20thNight
37%
760
19%
3217
16%
759
46%
759
16%
2152
December21st to endNight
31%
826
12%
4791
13%
817
40%
817
11%
2917

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%3442345%6%60%
74757
Night
26%35%43445%7%57%
74954
TransparencyDay
25%6%10%19%24%17%
74466
Night
26%7%11%20%23%14%
74767
SeeingDay
14%20%30%22%11%2
13912
Night
11%13%22%30%20%4
23353

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
38%47%6%45%5%7%9%43%
1519
11th to 20thDay
28%35%6%35%5%5%7%52%
1489
21st to endDay
311%5%7%5%25%6%5%7%42%
1782
February1st to 10thDay
38%46%5%35%5%6%6%50%
1620
11th to 20thDay
28%6%7%5%335%6%7%49%
1736
21st to endDay
110%5%8%5%2446%7%46%
1480
March1st to 10thDay
212%7%10%6%45%45%6%37%
1800
11th to 20thDay
312%6%7%6%446%5%7%41%
1961
21st to endDay
212%5%6%5%446%6%8%43%
2308
April1st to 10thDay
410%46%5%25%46%8%46%
2160
11th to 20thDay
39%46%425%45%7%51%
2129
21st to endDay
49%35%42336%7%56%
2160
May1st to 10thDay
5%7%2442345%8%58%
2255
11th to 20thDay
47%25%424446%57%
2454
21st to endDay
7%8%36%6%34447%48%
2723
June1st to 10thDay
442443445%8%58%
2520
11th to 20thDay
2313223335%75%
2520
21st to endDay
2312212335%76%
2520
July1st to 10thDay
11121223482%
2520
11th to 20thDay
1112212235%80%
2520
21st to endDay
211322335%473%
2669
August1st to 10thDay
321322234475%
2320
11th to 20thDay
112223335%79%
2122
21st to endDay
11111222385%
2376
September1st to 10thDay
21121223481%
2160
11th to 20thDay
2313313245%73%
2141
21st to endDay
3412212245%74%
1980
October1st to 10thDay
5%5%2432344466%
1814
11th to 20thDay
3424313345%68%
1800
21st to endDay
3413322347%66%
1943
November1st to 10thDay
47%344245%47%55%
1674
11th to 20thDay
26%23425%6%6%10%54%
1710
21st to endDay
26%35%5%235%6%8%54%
1630
December1st to 10thDay
39%46%6%3446%8%47%
1520
11th to 20thDay
6%14%6%8%6%36%6%6%7%33%
1928
21st to endDay
38%37%6%35%5%8%11%41%
2794
January1st to 10thNight
38%47%5%35%6%7%10%42%
2646
11th to 20thNight
26%46%5%36%6%6%8%47%
2482
21st to endNight
310%5%6%6%45%5%6%6%45%
2574
February1st to 10thNight
27%37%6%45%5%6%7%48%
2340
11th to 20thNight
17%46%5%45%6%6%9%47%
2111
21st to endNight
28%5%8%5%35%5%5%9%47%
1776
March1st to 10thNight
29%5%9%6%46%5%6%8%41%
2160
11th to 20thNight
110%5%6%5%45%5%8%8%44%
1998
21st to endNight
27%46%6%45%5%6%8%47%
2047
April1st to 10thNight
37%46%6%36%6%7%8%46%
1800
11th to 20thNight
38%345%245%5%7%54%
1779
21st to endNight
46%33433446%59%
1800
May1st to 10thNight
46%2432445%5%61%
1702
11th to 20thNight
26%2444435%8%58%
1434
21st to endNight
5%7%34424448%54%
1552
June1st to 10thNight
4415%324448%61%
1440
11th to 20thNight
1211222345%78%
1440
21st to endNight
221321333476%
1440
July1st to 10thNight
111222222482%
1440
11th to 20thNight
211221223480%
1440
21st to endNight
421231333474%
1643
August1st to 10thNight
321242334472%
1618
11th to 20thNight
221221233477%
1780
21st to endNight
11221123382%
1980
September1st to 10thNight
211111222484%
1800
11th to 20thNight
2212212235%78%
1818
21st to endNight
221322234475%
1980
October1st to 10thNight
442332233470%
2142
11th to 20thNight
3213322247%71%
2160
21st to endNight
2413222447%68%
2412
November1st to 10thNight
36%3443445%7%56%
2405
11th to 20thNight
26%244335%6%9%57%
2470
21st to endNight
25%35%6%35%5%5%8%54%
2547
December1st to 10thNight
36%45%5%35%5%6%8%49%
2660
11th to 20thNight
415%5%8%6%36%5%6%9%34%
3276
21st to endNight
29%5%8%8%5%7%6%6%8%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
35%11%15%23%14%2
1519
11th to 20thDay
33%7%15%20%16%9%
1489
21st to endDay
40%6%11%19%20%5%
1782
February1st to 10thDay
34%6%13%22%17%8%
1620
11th to 20thDay
34%7%14%24%17%5%
1746
21st to endDay
37%7%14%22%15%5%
1480
March1st to 10thDay
45%8%12%19%13%2
1800
11th to 20thDay
39%8%13%17%18%5%
1961
21st to endDay
36%10%19%20%11%3
2308
April1st to 10thDay
35%10%16%20%16%4
2160
11th to 20thDay
31%8%12%25%19%5%
2132
21st to endDay
28%6%15%27%21%3
2160
May1st to 10thDay
25%5%11%31%24%4
2255
11th to 20thDay
28%5%12%26%24%6%
2457
21st to endDay
35%7%12%24%19%4
2724
June1st to 10thDay
25%5%10%22%30%8%
2520
11th to 20thDay
13%48%23%34%18%
2520
21st to endDay
11%35%16%35%31%
2520
July1st to 10thDay
8%2411%27%48%
2451
11th to 20thDay
9%2413%26%46%
2445
21st to endDay
13%36%10%23%45%
2521
August1st to 10thDay
14%35%12%24%42%
2304
11th to 20thDay
10%3410%31%43%
2122
21st to endDay
7%2310%36%42%
2376
September1st to 10thDay
9%2311%33%43%
2160
11th to 20thDay
15%46%18%34%23%
2141
21st to endDay
15%25%23%34%21%
1980
October1st to 10thDay
22%47%18%32%17%
1814
11th to 20thDay
17%49%23%29%18%
1800
21st to endDay
19%5%10%25%25%16%
1943
November1st to 10thDay
29%6%11%21%22%11%
1674
11th to 20thDay
25%10%13%22%24%6%
1710
21st to endDay
28%7%10%25%22%8%
1630
December1st to 10thDay
34%8%13%21%18%5%
1520
11th to 20thDay
47%11%8%16%12%5%
1928
21st to endDay
35%9%17%19%18%3
2794
January1st to 10thNight
34%12%15%22%15%2
2646
11th to 20thNight
32%9%14%21%16%8%
2482
21st to endNight
38%6%12%17%20%7%
2574
February1st to 10thNight
34%7%12%21%18%7%
2340
11th to 20thNight
31%9%13%24%19%5%
2112
21st to endNight
34%10%14%22%16%5%
1776
March1st to 10thNight
38%10%13%22%12%5%
2160
11th to 20thNight
33%11%12%19%20%5%
1998
21st to endNight
32%13%20%20%12%3
2047
April1st to 10thNight
33%10%16%22%15%4
1800
11th to 20thNight
28%7%17%25%17%5%
1779
21st to endNight
25%7%18%30%17%3
1800
May1st to 10thNight
23%8%11%28%26%4
1702
11th to 20thNight
25%5%15%29%20%6%
1434
21st to endNight
27%7%15%30%17%3
1552
June1st to 10thNight
23%6%10%25%28%8%
1440
11th to 20thNight
11%49%24%34%18%
1440
21st to endNight
12%36%15%34%29%
1440
July1st to 10thNight
9%248%32%45%
1400
11th to 20thNight
9%3412%26%47%
1392
21st to endNight
13%35%8%25%45%
1552
August1st to 10thNight
16%4414%24%37%
1609
11th to 20thNight
11%3412%31%40%
1780
21st to endNight
8%2312%34%40%
1980
September1st to 10thNight
7%2310%35%43%
1800
11th to 20thNight
11%37%21%38%21%
1818
21st to endNight
14%36%21%35%21%
1980
October1st to 10thNight
20%48%20%30%18%
2142
11th to 20thNight
15%48%22%32%18%
2160
21st to endNight
16%5%10%25%31%13%
2412
November1st to 10thNight
26%8%12%21%22%11%
2405
11th to 20thNight
23%7%13%25%25%7%
2470
21st to endNight
29%6%10%24%21%10%
2547
December1st to 10thNight
31%10%12%19%21%7%
2660
11th to 20thNight
42%12%9%16%17%5%
3276
21st to endNight
39%13%14%15%16%3
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
33%22%23%13%9%1
180
11th to 20thDay
26%19%22%21%11%1
209
21st to endDay
16%24%29%20%8%3
374
February1st to 10thDay
23%23%27%18%9%1
340
11th to 20thDay
23%23%28%21%5%
409
21st to endDay
24%23%32%17%41
346
March1st to 10thDay
29%29%25%11%5%1
420
11th to 20thDay
24%26%24%16%8%1
420
21st to endDay
23%30%26%17%4
462
April1st to 10thDay
21%29%27%16%6%1
420
11th to 20thDay
25%28%26%14%5%1
412
21st to endDay
18%25%27%19%9%2
420
May1st to 10thDay
19%26%26%21%6%2
423
11th to 20thDay
19%24%26%19%8%3
448
21st to endDay
18%19%25%21%13%4
485
June1st to 10thDay
13%20%32%21%11%4
450
11th to 20thDay
13%21%36%18%11%2
450
21st to endDay
416%35%27%15%4
450
July1st to 10thDay
314%42%27%13%2
446
11th to 20thDay
211%41%30%14%3
444
21st to endDay
210%36%32%16%5%
487
August1st to 10thDay
413%34%30%15%4
447
11th to 20thDay
312%35%26%19%5%
437
21st to endDay
312%42%27%14%2
495
September1st to 10thDay
411%38%29%16%2
450
11th to 20thDay
8%17%29%30%15%2
450
21st to endDay
8%17%36%27%11%1
450
October1st to 10thDay
9%21%26%26%15%2
450
11th to 20thDay
11%17%23%30%14%4
450
21st to endDay
12%20%28%22%17%2
458
November1st to 10thDay
20%16%22%19%20%4
270
11th to 20thDay
12%18%26%22%16%6%
270
21st to endDay
13%22%24%23%15%3
232
December1st to 10thDay
24%19%21%18%14%3
180
11th to 20thDay
20%27%21%16%11%5%
180
21st to endDay
27%21%25%17%9%2
198
January1st to 10thNight
15%16%24%23%14%7%
760
11th to 20thNight
14%13%23%33%12%4
724
21st to endNight
11%16%28%24%17%4
792
February1st to 10thNight
15%14%26%28%15%3
720
11th to 20thNight
13%15%25%26%14%5%
704
21st to endNight
19%15%21%31%11%3
592
March1st to 10thNight
18%20%26%21%13%3
720
11th to 20thNight
14%22%20%21%20%4
720
21st to endNight
14%26%22%24%12%1
792
April1st to 10thNight
10%22%28%25%14%1
720
11th to 20thNight
14%20%23%25%13%4
711
21st to endNight
10%17%25%26%18%4
720
May1st to 10thNight
12%16%26%26%17%3
622
11th to 20thNight
9%12%22%34%20%2
372
21st to endNight
11%10%18%34%25%3
389
June1st to 10thNight
6%11%21%36%23%3
360
11th to 20thNight
411%23%36%26%1
360
21st to endNight
36%21%41%26%3
360
July1st to 10thNight
2320%45%28%2
350
11th to 20thNight
25%23%39%31%
348
21st to endNight
2316%39%34%6%
461
August1st to 10thNight
3217%40%33%4
544
11th to 20thNight
2420%41%29%4
712
21st to endNight
25%26%41%24%3
792
September1st to 10thNight
26%21%38%30%4
720
11th to 20thNight
410%19%29%31%7%
720
21st to endNight
5%10%21%31%23%10%
720
October1st to 10thNight
8%10%19%35%22%6%
720
11th to 20thNight
10%6%17%37%24%6%
720
21st to endNight
10%11%17%27%24%11%
792
November1st to 10thNight
14%13%17%25%24%7%
740
11th to 20thNight
11%15%23%29%17%5%
760
21st to endNight
12%14%21%28%19%5%
760
December1st to 10thNight
17%13%21%29%15%4
760
11th to 20thNight
17%17%24%25%12%5%
760
21st to endNight
18%18%27%24%11%2
836
Page generated at 2024-01-08 08:14:18. Version ac07

Copyright 2024 Attilla Danko


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