Meeker
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Meeker clear sky chart from 2005-11-05 to 2017-09-24.

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
55%
15955
23%
46980
19%
15915
59%
15915
32%
28422

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
48%
819
19%
2428
16%
817
52%
817
26%
1571
January16th to endNight
46%
768
23%
2496
22%
768
50%
768
24%
1619
February1st to 15thNight
45%
700
13%
2288
14%
700
47%
700
20%
1587
February16th to endNight
40%
632
20%
1956
15%
632
48%
632
24%
1283
March1st to 15thNight
52%
720
23%
1992
17%
720
58%
720
33%
1237
March16th to endNight
47%
762
21%
2106
13%
762
53%
762
29%
1371
April1st to 15thNight
44%
539
16%
1798
16%
539
47%
539
26%
1080
April16th to endNight
46%
540
21%
1777
18%
540
51%
540
23%
1119
May1st to 15thNight
51%
540
20%
1606
16%
540
54%
540
28%
1004
May16th to endNight
54%
563
22%
1498
17%
561
57%
561
34%
927
June1st to 15thNight
64%
540
25%
1440
18%
540
68%
540
48%
762
June16th to endNight
72%
540
31%
1440
26%
540
77%
540
59%
718
July1st to 15thNight
77%
510
20%
1360
18%
510
78%
510
47%
760
July16th to endNight
82%
564
25%
1581
24%
531
83%
531
46%
834
August1st to 15thNight
76%
539
25%
1611
24%
536
77%
536
41%
865
August16th to endNight
82%
573
34%
1863
35%
573
83%
573
45%
917
September1st to 15thNight
73%
540
30%
1800
30%
540
78%
540
43%
892
September16th to endNight
69%
642
36%
1911
30%
642
74%
642
49%
948
October1st to 15thNight
60%
660
29%
1980
22%
660
65%
660
37%
1112
October16th to endNight
60%
704
30%
2112
23%
704
64%
704
39%
1174
November1st to 15thNight
53%
800
26%
2209
18%
800
57%
800
35%
1333
November16th to endNight
48%
900
23%
2520
17%
900
52%
900
33%
1521
December1st to 15thNight
38%
900
12%
2520
8%
900
41%
900
23%
1756
December16th to endNight
34%
960
12%
2688
9%
960
36%
960
17%
2032

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
5%8%35%5%3445%7%47%
47954
Night
6%8%35%42445%6%49%
47163
TransparencyDay
36%5%10%21%18%8%
47639
Night
35%411%23%17%7%
46980
SeeingDay
9%15%28%27%15%3
5813
Night
10%8%19%34%23%3
15962

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
7%14%5%6%6%33346%38%
1519
16th to endDay
5%14%7%7%423236%41%
1728
February1st to 15thDay
7%17%5%8%5%34436%33%
1575
16th to endDay
415%6%8%6%34446%35%
1517
March1st to 15thDay
412%46%5%1335%6%44%
1966
16th to endDay
412%47%5%35%5%5%7%39%
2118
April1st to 15thDay
6%13%46%6%245%5%5%39%
2150
16th to endDay
7%10%26%6%25%5%6%6%38%
2181
May1st to 15thDay
8%7%25%6%36%5%6%7%39%
2343
16th to endDay
6%5%16%5%35%5%5%8%44%
2616
June1st to 15thDay
432332446%7%56%
2520
16th to endDay
212222345%70%
2520
July1st to 15thDay
42145%35%6%5%8%51%
2520
16th to endDay
4325%5%36%6%7%8%44%
2477
August1st to 15thDay
5%415%5%45%5%7%8%46%
2340
16th to endDay
3214435%45%9%54%
2339
September1st to 15thDay
5%2144345%6%6%54%
2160
16th to endDay
6%313324235%62%
1905
October1st to 15thDay
8%5%14424446%52%
1650
16th to endDay
7%6%2442245%6%54%
1760
November1st to 15thDay
8%9%3432434452%
1634
16th to endDay
410%3432445%6%49%
1440
December1st to 15thDay
9%13%5%9%6%33335%36%
1440
16th to endDay
9%16%5%9%6%33336%31%
1536
January1st to 15thNight
7%12%35%423345%45%
2428
16th to endNight
7%14%5%7%413235%43%
2496
February1st to 15thNight
6%12%48%7%35%445%37%
2277
16th to endNight
5%12%5%7%5%23447%40%
1956
March1st to 15thNight
49%45%424446%49%
1992
16th to endNight
5%10%45%5%3345%7%43%
2106
April1st to 15thNight
7%10%25%42445%6%44%
1798
16th to endNight
8%11%45%43435%5%43%
1777
May1st to 15thNight
9%7%25%425%45%7%45%
1605
16th to endNight
6%5%25%5%4436%7%48%
1497
June1st to 15thNight
42123245%6%7%60%
1440
16th to endNight
221221335%8%67%
1440
July1st to 15thNight
3234245%7%9%55%
1440
16th to endNight
12135%25%5%6%9%55%
1688
August1st to 15thNight
431432445%9%55%
1620
16th to endNight
321332445%11%57%
1863
September1st to 15thNight
431233346%8%59%
1800
16th to endNight
4312223345%65%
1911
October1st to 15thNight
5%5%14324445%56%
1980
16th to endNight
8%7%22213347%55%
2112
November1st to 15thNight
8%9%24323345%52%
2209
16th to endNight
6%10%3432335%6%50%
2520
December1st to 15thNight
9%13%48%5%23345%38%
2520
16th to endNight
8%16%7%11%6%23435%30%
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
47%419%20%7%
1520
16th to endDay
46%314%22%10%1
1728
February1st to 15thDay
54%413%18%7%1
1575
16th to endDay
50%412%21%9%1
1517
March1st to 15thDay
40%314%24%14%2
1966
16th to endDay
44%49%28%10%2
2118
April1st to 15thDay
44%410%20%15%3
2150
16th to endDay
43%6%9%22%16%2
2181
May1st to 15thDay
40%6%8%21%20%2
2343
16th to endDay
36%5%8%23%21%2
2620
June1st to 15thDay
25%47%17%28%16%
2520
16th to endDay
15%3212%34%31%
2520
July1st to 15thDay
29%6%8%13%17%24%
2371
16th to endDay
32%6%9%18%18%14%
2321
August1st to 15thDay
33%6%10%17%17%14%
2325
16th to endDay
25%5%7%24%25%11%
2339
September1st to 15thDay
26%6%8%14%25%18%
2160
16th to endDay
25%35%25%34%6%
1905
October1st to 15thDay
31%410%26%22%3
1650
16th to endDay
30%311%33%19%2
1760
November1st to 15thDay
35%211%22%22%4
1634
16th to endDay
34%416%29%13%1
1440
December1st to 15thDay
51%316%22%6%
1440
16th to endDay
55%6%14%16%6%
1536
January1st to 15thNight
41%417%25%9%1
2428
16th to endNight
45%313%24%11%2
2496
February1st to 15thNight
49%5%12%21%10%
2288
16th to endNight
43%412%26%12%1
1956
March1st to 15thNight
36%313%28%15%2
1992
16th to endNight
40%410%28%12%3
2106
April1st to 15thNight
38%313%22%16%5%
1798
16th to endNight
42%39%22%19%2
1777
May1st to 15thNight
38%5%10%22%19%2
1606
16th to endNight
34%49%27%20%4
1498
June1st to 15thNight
21%39%20%28%16%
1440
16th to endNight
16%3312%28%35%
1440
July1st to 15thNight
23%5%11%17%16%25%
1360
16th to endNight
22%5%14%22%15%19%
1581
August1st to 15thNight
24%6%10%22%18%16%
1611
16th to endNight
21%5%7%23%27%15%
1863
September1st to 15thNight
22%49%19%21%22%
1800
16th to endNight
20%37%26%32%10%
1911
October1st to 15thNight
29%47%28%23%6%
1980
16th to endNight
29%310%30%23%3
2112
November1st to 15thNight
34%39%27%20%4
2209
16th to endNight
34%312%29%15%3
2520
December1st to 15thNight
47%416%19%10%
2520
16th to endNight
56%413%17%7%
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
26%418%21%24%4
90
16th to endDay
18%6%26%33%14%1
96
February1st to 15thDay
21%13%33%23%8%
90
16th to endDay
17%23%24%19%13%1
81
March1st to 15thDay
11%33%30%19%5%
256
16th to endDay
15%29%37%12%5%
288
April1st to 15thDay
13%32%25%18%7%2
269
16th to endDay
19%27%34%14%4
270
May1st to 15thDay
13%21%34%19%10%1
300
16th to endDay
11%13%26%25%17%4
517
June1st to 15thDay
5%15%26%28%19%5%
495
16th to endDay
28%27%34%21%5%
495
July1st to 15thDay
5%5%20%32%28%8%
475
16th to endDay
5%5%28%38%18%2
336
August1st to 15thDay
8%7%32%35%12%3
315
16th to endDay
4325%40%21%3
332
September1st to 15thDay
5%11%37%28%11%6%
315
16th to endDay
11%14%27%26%12%6%
241
October1st to 15thDay
5%10%24%32%23%4
90
16th to endDay
14%17%21%25%17%3
96
November1st to 15thDay
5%12%32%22%20%7%
90
16th to endDay
18%21%33%21%5%
90
December1st to 15thDay
18%24%27%25%3
90
16th to endDay
12%20%32%30%4
96
January1st to 15thNight
14%8%20%38%14%3
822
16th to endNight
14%10%19%38%14%2
768
February1st to 15thNight
12%5%24%41%13%1
704
16th to endNight
12%12%26%38%9%
632
March1st to 15thNight
9%10%21%38%19%1
720
16th to endNight
11%9%26%36%15%1
762
April1st to 15thNight
12%13%26%35%11%
539
16th to endNight
14%14%18%31%16%4
540
May1st to 15thNight
13%6%22%34%19%2
540
16th to endNight
10%8%19%30%25%5%
563
June1st to 15thNight
6%8%17%37%26%3
540
16th to endNight
3416%39%33%3
540
July1st to 15thNight
5%29%31%44%7%
510
16th to endNight
115%28%54%7%
564
August1st to 15thNight
5%27%36%44%4
539
16th to endNight
327%31%45%9%
573
September1st to 15thNight
6%211%34%37%6%
540
16th to endNight
6%5%13%29%32%11%
642
October1st to 15thNight
8%6%19%33%25%5%
660
16th to endNight
11%6%17%31%25%6%
704
November1st to 15thNight
12%9%20%31%23%2
800
16th to endNight
12%10%23%34%15%2
900
December1st to 15thNight
16%10%27%33%11%1
900
16th to endNight
17%12%27%30%10%1
960
Page generated at 2017-09-25 07:02:30. Version ac04

Copyright 2017 A. Danko


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