Mew Lake Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mew Lake Campground clear sky chart from 2005-11-06 to 2024-01-10.

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
24%
22570
12%
74323
7%
22527
31%
22527
14%
55193

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
9%
760
6%
2647
2%
757
14%
757
5%
2230
January11th to 20thNight
13%
720
8%
2516
3%
720
18%
720
6%
2084
January21st to endNight
19%
792
12%
2574
7%
792
25%
792
11%
1993
February1st to 10thNight
9%
720
7%
2340
2%
720
14%
720
7%
1921
February11th to 20thNight
13%
703
13%
2275
4%
700
24%
700
10%
1734
February21st to endNight
14%
592
12%
1888
4%
592
23%
592
10%
1479
March1st to 10thNight
16%
720
15%
2017
7%
720
24%
720
14%
1523
March11th to 20thNight
17%
720
14%
1980
5%
720
26%
720
15%
1481
March21st to endNight
23%
792
18%
2164
7%
792
32%
792
20%
1513
April1st to 10thNight
17%
720
14%
1800
4%
720
23%
720
17%
1380
April11th to 20thNight
25%
673
18%
1737
7%
673
31%
673
20%
1258
April21st to endNight
28%
540
15%
1620
8%
540
34%
540
17%
1186
May1st to 10thNight
35%
437
18%
1517
14%
437
43%
437
19%
984
May11th to 20thNight
30%
354
20%
1416
14%
354
46%
354
19%
872
May21st to endNight
33%
388
13%
1551
9%
388
46%
388
21%
926
June1st to 10thNight
28%
360
9%
1440
9%
360
37%
360
16%
935
June11th to 20thNight
40%
360
15%
1324
15%
360
48%
360
24%
794
June21st to endNight
37%
360
11%
1260
9%
360
45%
360
19%
837
July1st to 10thNight
43%
350
16%
1241
17%
350
51%
350
29%
710
July11th to 20thNight
44%
348
15%
1392
19%
348
53%
348
23%
826
July21st to endNight
43%
407
15%
1499
14%
385
50%
385
24%
872
August1st to 10thNight
48%
537
15%
1600
11%
534
53%
534
28%
993
August11th to 20thNight
52%
534
16%
1598
10%
534
58%
534
28%
1020
August21st to endNight
38%
683
15%
1871
7%
683
44%
683
28%
1241
September1st to 10thNight
43%
720
16%
1800
7%
720
46%
720
32%
1192
September11th to 20thNight
40%
720
20%
1836
11%
720
44%
720
30%
1224
September21st to endNight
39%
720
18%
2056
13%
720
43%
720
23%
1409
October1st to 10thNight
29%
720
16%
2160
10%
720
37%
720
18%
1537
October11th to 20thNight
18%
720
10%
2160
4%
720
26%
720
12%
1684
October21st to endNight
14%
792
11%
2398
4%
792
22%
792
9%
1933
November1st to 10thNight
21%
740
13%
2546
9%
740
29%
740
12%
1878
November11th to 20thNight
16%
760
11%
2660
7%
760
23%
760
9%
2060
November21st to endNight
13%
760
6%
2660
3%
760
18%
760
6%
2232
December1st to 10thNight
8%
760
6%
2660
1%
760
13%
760
4%
2336
December11th to 20thNight
11%
760
8%
3268
3%
759
19%
759
5%
2696
December21st to endNight
8%
828
4%
4852
1%
817
12%
817
2%
4220

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
17%12%5%8%6%35%45%6%29%
75115
Night
15%14%5%9%6%34446%28%
74542
TransparencyDay
56%5%10%18%9%1
74818
Night
57%5%10%17%9%1
74375
SeeingDay
24%18%31%18%7%2
13651
Night
23%16%31%21%8%1
22579

By Month

Percentage Cloud Cover NE (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
12%19%9%14%10%35%35%5%15%
1509
11th to 20thDay
16%17%7%13%8%35%5%45%18%
1440
21st to endDay
12%15%7%14%8%47%5%46%20%
1782
February1st to 10thDay
11%17%9%13%12%46%44416%
1620
11th to 20thDay
11%15%7%11%10%46%45%6%22%
1573
21st to endDay
15%17%7%10%10%45%5%45%19%
1368
March1st to 10thDay
13%14%5%12%7%45%445%26%
1936
11th to 20thDay
12%15%7%10%8%5%444426%
1980
21st to endDay
16%13%5%8%5%34345%35%
2191
April1st to 10thDay
20%16%6%8%5%33446%26%
2160
11th to 20thDay
20%11%5%7%5%34345%34%
2188
21st to endDay
20%14%47%5%23336%32%
2340
May1st to 10thDay
19%11%37%5%34447%33%
2443
11th to 20thDay
19%9%46%6%34436%35%
2478
21st to endDay
15%7%46%6%35%45%7%39%
2725
June1st to 10thDay
21%9%46%5%35%46%7%30%
2520
11th to 20thDay
16%7%35%5%35%6%5%8%37%
2631
21st to endDay
18%8%36%6%46%5%5%8%32%
2700
July1st to 10thDay
14%5%25%6%46%5%7%8%38%
2679
11th to 20thDay
13%6%46%6%5%5%5%6%8%36%
2520
21st to endDay
14%7%37%7%36%6%5%9%33%
2728
August1st to 10thDay
15%7%36%7%46%6%5%8%33%
2327
11th to 20thDay
16%7%35%7%45%6%7%7%34%
2303
21st to endDay
15%7%37%6%5%5%5%6%8%32%
2466
September1st to 10thDay
16%8%35%5%35%5%6%7%38%
2160
11th to 20thDay
17%6%45%5%3445%6%41%
2122
21st to endDay
20%9%37%6%35%5%46%33%
1904
October1st to 10thDay
21%10%46%5%35%446%32%
1800
11th to 20thDay
25%16%5%7%7%44345%20%
1800
21st to endDay
29%16%6%8%6%3334418%
1956
November1st to 10thDay
16%16%5%8%6%34447%26%
1528
11th to 20thDay
17%18%7%13%6%34345%20%
1520
21st to endDay
20%20%9%12%6%4444313%
1520
December1st to 10thDay
18%23%9%12%7%34345%13%
1520
11th to 20thDay
15%21%11%11%8%4433416%
1906
21st to endDay
21%22%9%13%9%2222314%
2772
January1st to 10thNight
15%20%8%14%9%46%5%4412%
2647
11th to 20thNight
14%18%8%13%10%5%5%335%16%
2516
21st to endNight
12%14%7%11%9%46%5%45%23%
2574
February1st to 10thNight
11%16%8%12%10%6%5%5%5%6%16%
2340
11th to 20thNight
10%15%8%12%8%45%45%5%25%
2273
21st to endNight
12%16%7%13%8%5%5%445%21%
1888
March1st to 10thNight
12%13%6%11%8%35%43431%
2007
11th to 20thNight
12%14%6%9%7%45%445%30%
1979
21st to endNight
12%13%5%8%5%3445%6%36%
2164
April1st to 10thNight
19%15%6%7%434347%29%
1800
11th to 20thNight
17%11%5%6%433445%37%
1737
21st to endNight
20%10%48%6%35%445%31%
1620
May1st to 10thNight
18%8%37%5%245%6%8%36%
1517
11th to 20thNight
17%8%2443445%8%40%
1415
21st to endNight
12%7%36%4345%5%8%44%
1550
June1st to 10thNight
17%8%46%5%35%5%5%6%35%
1440
11th to 20thNight
15%6%25%5%25%5%48%44%
1324
21st to endNight
15%9%46%5%25%5%6%8%36%
1260
July1st to 10thNight
10%6%25%5%3345%8%47%
1276
11th to 20thNight
12%7%36%434448%45%
1440
21st to endNight
11%6%245%36%5%6%8%44%
1587
August1st to 10thNight
12%5%35%4245%6%8%45%
1611
11th to 20thNight
10%6%25%5%46%6%6%7%44%
1598
21st to endNight
13%6%35%5%35%47%9%40%
1871
September1st to 10thNight
12%6%25%3345%5%7%46%
1800
11th to 20thNight
15%9%35%42335%7%45%
1836
21st to endNight
18%8%37%434447%39%
2056
October1st to 10thNight
20%10%35%4345%46%35%
2160
11th to 20thNight
23%14%37%5%3445%5%25%
2160
21st to endNight
25%17%5%8%5%34345%21%
2398
November1st to 10thNight
17%15%5%7%5%35%445%29%
2546
11th to 20thNight
17%15%6%9%7%35%45%6%23%
2660
21st to endNight
17%21%7%10%8%45%435%16%
2660
December1st to 10thNight
17%23%10%14%8%3334312%
2660
11th to 20thNight
14%21%10%12%8%3433417%
3288
21st to endNight
21%22%8%14%9%3433311%
4884

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
72%47%12%5%
1510
11th to 20thDay
69%46%10%9%2
1440
21st to endDay
66%46%10%11%2
1782
February1st to 10thDay
71%45%12%6%1
1620
11th to 20thDay
64%410%12%9%1
1582
21st to endDay
68%47%12%9%
1368
March1st to 10thDay
62%411%13%9%2
1939
11th to 20thDay
62%48%14%10%2
1980
21st to endDay
53%48%17%14%5%
2191
April1st to 10thDay
60%49%16%9%2
2160
11th to 20thDay
54%47%22%11%2
2188
21st to endDay
56%47%17%12%3
2340
May1st to 10thDay
51%49%19%12%3
2443
11th to 20thDay
51%5%7%22%13%2
2482
21st to endDay
45%7%11%20%13%3
2725
June1st to 10thDay
53%6%10%20%11%1
2520
11th to 20thDay
45%6%10%23%14%2
2631
21st to endDay
51%6%12%20%10%1
2700
July1st to 10thDay
41%6%12%27%12%1
2606
11th to 20thDay
44%7%12%26%10%1
2445
21st to endDay
46%7%12%25%9%
2575
August1st to 10thDay
47%8%14%21%9%1
2314
11th to 20thDay
46%8%15%23%8%1
2303
21st to endDay
48%7%13%21%10%1
2466
September1st to 10thDay
44%6%12%25%12%1
2160
11th to 20thDay
44%6%12%27%11%
2122
21st to endDay
53%6%10%24%7%
1904
October1st to 10thDay
54%6%11%18%10%1
1800
11th to 20thDay
68%5%10%12%5%1
1800
21st to endDay
70%48%11%6%1
1956
November1st to 10thDay
58%5%13%17%5%1
1528
11th to 20thDay
67%5%9%12%6%1
1520
21st to endDay
76%5%8%8%41
1520
December1st to 10thDay
75%46%9%41
1520
11th to 20thDay
74%36%8%7%1
1906
21st to endDay
77%3412%4
2772
January1st to 10thNight
75%49%8%5%
2647
11th to 20thNight
73%46%9%7%2
2516
21st to endNight
62%5%7%14%11%1
2574
February1st to 10thNight
68%6%8%10%7%1
2340
11th to 20thNight
62%49%16%8%1
2275
21st to endNight
64%47%16%8%1
1888
March1st to 10thNight
58%49%15%12%2
2017
11th to 20thNight
56%5%11%16%11%1
1980
21st to endNight
48%5%9%20%14%4
2164
April1st to 10thNight
57%47%18%12%2
1800
11th to 20thNight
51%46%23%15%1
1737
21st to endNight
55%5%7%16%15%2
1620
May1st to 10thNight
45%6%11%20%15%3
1517
11th to 20thNight
43%6%8%24%17%2
1416
21st to endNight
39%7%15%20%16%3
1551
June1st to 10thNight
48%5%11%21%12%1
1440
11th to 20thNight
39%6%13%26%16%1
1324
21st to endNight
46%6%15%21%11%1
1260
July1st to 10thNight
32%7%14%26%19%1
1241
11th to 20thNight
39%6%13%29%12%1
1392
21st to endNight
35%8%17%28%11%1
1499
August1st to 10thNight
36%8%17%26%12%1
1600
11th to 20thNight
36%9%19%26%9%1
1598
21st to endNight
40%7%17%26%10%1
1871
September1st to 10thNight
36%8%16%27%12%1
1800
11th to 20thNight
40%5%13%30%11%
1836
21st to endNight
46%6%12%28%8%
2056
October1st to 10thNight
50%6%11%19%14%
2160
11th to 20thNight
60%7%12%16%6%
2160
21st to endNight
67%48%12%8%1
2398
November1st to 10thNight
58%5%12%18%7%
2546
11th to 20thNight
63%6%12%12%6%1
2660
21st to endNight
72%5%10%9%4
2660
December1st to 10thNight
78%5%6%8%3
2660
11th to 20thNight
72%46%12%7%
3288
21st to endNight
80%35%7%4
4884

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
26%25%33%12%41
178
11th to 20thDay
31%16%36%12%41
160
21st to endDay
25%20%36%14%5%
264
February1st to 10thDay
30%31%32%5%2
240
11th to 20thDay
27%32%35%5%
240
21st to endDay
37%23%31%8%1
234
March1st to 10thDay
26%24%35%13%2
420
11th to 20thDay
25%24%33%12%41
420
21st to endDay
27%24%29%15%4
462
April1st to 10thDay
25%23%34%12%41
420
11th to 20thDay
31%21%23%14%8%3
412
21st to endDay
29%18%32%13%6%1
420
May1st to 10thDay
27%16%29%20%6%2
423
11th to 20thDay
24%19%30%17%8%2
447
21st to endDay
20%19%29%21%8%3
485
June1st to 10thDay
25%13%36%21%5%1
450
11th to 20thDay
18%14%35%21%10%2
561
21st to endDay
21%14%34%22%8%1
630
July1st to 10thDay
13%12%34%30%9%1
601
11th to 20thDay
17%13%32%24%11%3
444
21st to endDay
13%13%34%29%8%2
488
August1st to 10thDay
17%9%33%27%9%6%
446
11th to 20thDay
16%8%28%30%12%6%
439
21st to endDay
18%13%32%21%11%5%
495
September1st to 10thDay
18%12%34%19%12%5%
450
11th to 20thDay
21%10%27%23%14%6%
450
21st to endDay
22%17%26%20%11%3
450
October1st to 10thDay
26%19%24%16%11%2
450
11th to 20thDay
32%22%30%12%31
450
21st to endDay
39%18%27%14%2
482
November1st to 10thDay
30%23%32%12%3
222
11th to 20thDay
34%19%31%11%4
180
21st to endDay
34%20%35%9%11
180
December1st to 10thDay
31%21%33%14%1
180
11th to 20thDay
34%27%29%8%11
180
21st to endDay
29%29%25%14%31
198
January1st to 10thNight
25%22%36%14%3
760
11th to 20thNight
27%20%31%17%41
720
21st to endNight
18%19%34%21%7%1
792
February1st to 10thNight
21%25%39%13%3
720
11th to 20thNight
20%22%39%17%3
703
21st to endNight
24%23%32%19%3
592
March1st to 10thNight
22%25%32%19%3
720
11th to 20thNight
23%19%37%15%5%1
720
21st to endNight
19%20%33%22%6%1
792
April1st to 10thNight
28%16%33%19%4
720
11th to 20thNight
26%17%28%20%9%1
673
21st to endNight
25%12%29%23%11%
540
May1st to 10thNight
24%9%27%29%10%1
437
11th to 20thNight
22%11%34%26%8%
354
21st to endNight
16%10%37%27%11%
389
June1st to 10thNight
19%13%32%28%6%1
360
11th to 20thNight
18%7%30%33%11%1
360
21st to endNight
19%9%27%32%13%1
360
July1st to 10thNight
13%7%31%32%16%1
350
11th to 20thNight
15%6%28%35%15%1
348
21st to endNight
12%5%34%34%13%1
407
August1st to 10thNight
14%426%36%18%2
537
11th to 20thNight
11%6%23%34%22%3
534
21st to endNight
16%8%31%26%17%2
683
September1st to 10thNight
14%8%31%28%16%2
720
11th to 20thNight
21%8%27%26%15%3
720
21st to endNight
23%11%23%27%14%2
720
October1st to 10thNight
27%15%25%21%10%2
720
11th to 20thNight
29%18%30%15%7%1
720
21st to endNight
34%17%30%16%4
792
November1st to 10thNight
29%17%29%19%5%1
740
11th to 20thNight
26%24%28%16%6%
760
21st to endNight
31%20%28%17%4
760
December1st to 10thNight
33%20%34%10%3
760
11th to 20thNight
27%23%33%14%21
760
21st to endNight
33%19%30%14%3
836
Page generated at 2024-01-07 10:06:50. Version ac07

Copyright 2024 Attilla Danko


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