Meeker
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Meeker clear sky chart from 2005-11-06 to 2024-01-15.

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
51%
24558
23%
74513
18%
24509
57%
24509
31%
44298

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
43%
919
17%
2619
12%
918
48%
918
25%
1746
January11th to 20thNight
41%
736
25%
2392
20%
736
48%
736
24%
1518
January21st to endNight
40%
792
20%
2574
18%
792
45%
792
21%
1755
February1st to 10thNight
36%
720
16%
2340
13%
720
42%
720
20%
1597
February11th to 20thNight
38%
700
18%
2273
13%
700
45%
700
21%
1509
February21st to endNight
31%
592
23%
1780
12%
592
44%
592
23%
1179
March1st to 10thNight
40%
720
23%
1998
13%
720
49%
720
29%
1272
March11th to 20thNight
49%
720
25%
1980
15%
720
56%
720
33%
1231
March21st to endNight
40%
784
18%
2170
10%
784
47%
784
25%
1486
April1st to 10thNight
38%
540
18%
1800
16%
540
43%
540
22%
1119
April11th to 20thNight
39%
533
19%
1777
15%
533
47%
533
23%
1096
April21st to endNight
46%
540
21%
1767
17%
540
52%
540
25%
1086
May1st to 10thNight
43%
540
20%
1620
14%
540
49%
540
25%
1038
May11th to 20thNight
57%
531
23%
1489
18%
531
60%
531
35%
883
May21st to endNight
53%
584
23%
1552
16%
582
58%
582
36%
931
June1st to 10thNight
65%
540
27%
1440
19%
540
69%
540
47%
769
June11th to 20thNight
57%
540
28%
1440
19%
540
64%
540
45%
782
June21st to endNight
70%
540
30%
1440
25%
540
76%
540
58%
716
July1st to 10thNight
76%
525
22%
1400
19%
525
78%
525
47%
780
July11th to 20thNight
77%
522
25%
1462
22%
522
78%
522
48%
781
July21st to endNight
79%
591
24%
1674
23%
558
80%
558
43%
908
August1st to 10thNight
74%
537
25%
1602
22%
534
75%
534
41%
868
August11th to 20thNight
78%
534
33%
1620
30%
534
81%
534
48%
802
August21st to endNight
76%
594
32%
1980
35%
594
78%
594
44%
977
September1st to 10thNight
74%
540
34%
1800
34%
540
80%
540
47%
854
September11th to 20thNight
70%
554
34%
1814
33%
554
76%
554
46%
876
September21st to endNight
63%
720
36%
2056
25%
720
70%
720
50%
1039
October1st to 10thNight
58%
720
29%
2160
20%
720
65%
720
40%
1171
October11th to 20thNight
58%
720
34%
2160
22%
720
66%
720
43%
1126
October21st to endNight
52%
792
30%
2376
19%
792
61%
792
39%
1305
November1st to 10thNight
48%
804
28%
2284
18%
804
55%
804
36%
1309
November11th to 20thNight
43%
950
26%
2579
15%
950
51%
950
35%
1550
November21st to endNight
46%
950
23%
2660
15%
950
52%
950
32%
1642
December1st to 10thNight
39%
950
17%
2660
10%
950
44%
950
27%
1754
December11th to 20thNight
34%
950
19%
3103
9%
948
40%
948
20%
2039
December21st to endNight
29%
1034
9%
4672
8%
1026
34%
1026
13%
2804

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%36%5%345%5%7%48%
74718
Night
6%9%36%5%3445%7%50%
75076
TransparencyDay
35%5%9%21%20%9%
74433
Night
35%410%23%20%8%
74883
SeeingDay
11%16%29%27%14%3
14332
Night
11%9%23%35%19%3
24576

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
6%16%46%6%3345%7%39%
1560
11th to 20thDay
414%6%9%5%35%45%7%40%
1656
21st to endDay
5%15%7%9%5%33247%39%
1782
February1st to 10thDay
6%15%5%8%6%44446%37%
1620
11th to 20thDay
6%17%6%8%5%34447%36%
1575
21st to endDay
414%6%9%6%5%5%45%6%36%
1475
March1st to 10thDay
6%15%47%6%2435%7%42%
1960
11th to 20thDay
411%47%5%45%6%5%6%44%
1980
21st to endDay
5%13%6%8%7%35%5%5%7%35%
2186
April1st to 10thDay
6%13%37%6%35%5%5%6%41%
2160
11th to 20thDay
7%13%46%7%35%6%6%6%38%
2131
21st to endDay
6%9%36%6%35%5%6%6%43%
2190
May1st to 10thDay
9%9%26%7%46%6%7%8%38%
2340
11th to 20thDay
6%6%26%5%37%6%7%9%44%
2406
21st to endDay
5%5%26%7%46%6%6%9%45%
2724
June1st to 10thDay
43233345%7%9%56%
2520
11th to 20thDay
33144245%5%7%62%
2520
21st to endDay
221333346%6%67%
2520
July1st to 10thDay
42245%345%6%7%57%
2520
11th to 20thDay
34245%36%7%8%10%49%
2446
21st to endDay
4325%6%46%7%8%11%44%
2545
August1st to 10thDay
4425%6%5%6%6%7%9%46%
2328
11th to 20thDay
3324435%46%9%58%
2281
21st to endDay
3325%436%5%6%9%54%
2376
September1st to 10thDay
5%22343446%6%61%
2160
11th to 20thDay
43245%3445%6%60%
2142
21st to endDay
6%413324336%66%
1904
October1st to 10thDay
8%6%245%3445%7%54%
1800
11th to 20thDay
7%5%23423347%61%
1800
21st to endDay
7%8%3443345%6%55%
1980
November1st to 10thDay
6%7%35%42435%6%55%
1774
11th to 20thDay
7%11%344345%46%51%
1597
21st to endDay
411%5%6%42345%6%50%
1520
December1st to 10thDay
7%13%6%9%6%43346%40%
1520
11th to 20thDay
7%11%48%5%335%5%7%42%
1926
21st to endDay
5%15%5%9%5%3445%7%39%
2794
January1st to 10thNight
7%13%47%5%3445%6%44%
2619
11th to 20thNight
6%13%5%7%5%24347%44%
2392
21st to endNight
6%18%5%8%5%24345%39%
2574
February1st to 10thNight
5%13%5%8%7%35%45%6%39%
2340
11th to 20thNight
6%12%5%8%6%345%5%7%39%
2272
21st to endNight
5%12%5%10%5%34447%41%
1780
March1st to 10thNight
5%11%46%5%3445%7%45%
1998
11th to 20thNight
410%46%5%3445%6%49%
1980
21st to endNight
6%12%47%6%45%5%6%7%38%
2170
April1st to 10thNight
8%12%37%5%345%47%43%
1800
11th to 20thNight
7%12%35%5%35%5%6%6%42%
1777
21st to endNight
8%10%46%5%35%46%6%44%
1767
May1st to 10thNight
9%8%35%6%36%5%6%8%42%
1620
11th to 20thNight
6%7%25%445%5%7%7%49%
1488
21st to endNight
7%5%25%5%35%46%8%51%
1552
June1st to 10thNight
43134246%7%8%58%
1440
11th to 20thNight
5%42332445%7%60%
1440
21st to endNight
31122245%5%8%66%
1440
July1st to 10thNight
42135%45%7%7%10%56%
1440
11th to 20thNight
23245%35%5%7%10%55%
1510
21st to endNight
22145%45%6%8%10%52%
1773
August1st to 10thNight
4425%425%5%6%9%56%
1611
11th to 20thNight
3223425%5%5%10%59%
1620
21st to endNight
33143245%6%9%58%
1980
September1st to 10thNight
5%31233445%7%64%
1800
11th to 20thNight
431333445%8%62%
1814
21st to endNight
5%323323345%67%
2056
October1st to 10thNight
6%5%24424446%59%
2160
11th to 20thNight
5%6%23323347%62%
2160
21st to endNight
7%9%33314346%57%
2376
November1st to 10thNight
7%6%24423447%56%
2284
11th to 20thNight
6%10%3433445%7%51%
2579
21st to endNight
7%11%45%423446%51%
2660
December1st to 10thNight
7%12%48%6%33445%46%
2660
11th to 20thNight
7%12%48%6%35%5%5%7%39%
3271
21st to endNight
5%13%5%9%6%34447%41%
4873

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
47%415%24%8%2
1561
11th to 20thDay
46%5%13%23%13%1
1656
21st to endDay
48%5%15%21%8%3
1782
February1st to 10thDay
49%6%14%18%11%2
1620
11th to 20thDay
51%5%9%21%13%2
1584
21st to endDay
48%5%10%21%13%2
1475
March1st to 10thDay
43%410%26%15%2
1960
11th to 20thDay
40%5%12%25%14%3
1980
21st to endDay
48%6%9%23%10%3
2186
April1st to 10thDay
41%6%11%18%18%5%
2160
11th to 20thDay
44%6%8%21%18%3
2134
21st to endDay
40%7%7%25%19%2
2190
May1st to 10thDay
41%7%7%22%20%2
2340
11th to 20thDay
36%7%9%27%18%4
2410
21st to endDay
35%6%8%22%24%5%
2724
June1st to 10thDay
24%5%8%23%28%13%
2520
11th to 20thDay
21%5%6%15%29%24%
2520
21st to endDay
17%4414%32%29%
2520
July1st to 10thDay
25%6%7%13%23%27%
2451
11th to 20thDay
27%7%9%19%19%19%
2371
21st to endDay
31%7%11%20%19%13%
2404
August1st to 10thDay
32%8%11%18%18%13%
2313
11th to 20thDay
23%5%8%19%29%16%
2281
21st to endDay
26%5%7%20%26%16%
2376
September1st to 10thDay
22%6%6%14%27%26%
2160
11th to 20thDay
25%47%19%28%16%
2142
21st to endDay
22%3424%37%10%
1904
October1st to 10thDay
32%48%25%25%7%
1800
11th to 20thDay
25%47%30%29%6%
1800
21st to endDay
30%412%29%20%5%
1980
November1st to 10thDay
32%311%26%26%3
1774
11th to 20thDay
35%313%27%20%2
1597
21st to endDay
36%413%28%16%3
1520
December1st to 10thDay
47%415%22%9%3
1520
11th to 20thDay
42%412%27%14%1
1924
21st to endDay
47%410%16%20%2
2794
January1st to 10thNight
44%415%24%11%2
2619
11th to 20thNight
43%411%27%13%1
2392
21st to endNight
49%5%13%22%8%4
2574
February1st to 10thNight
48%5%12%21%12%1
2340
11th to 20thNight
46%5%8%24%15%2
2273
21st to endNight
43%5%11%23%15%3
1780
March1st to 10thNight
39%410%28%19%1
1998
11th to 20thNight
37%310%27%18%5%
1980
21st to endNight
45%5%11%24%13%2
2170
April1st to 10thNight
42%5%10%20%18%6%
1800
11th to 20thNight
40%6%10%24%17%3
1777
21st to endNight
41%38%25%21%2
1767
May1st to 10thNight
41%6%10%21%19%3
1620
11th to 20thNight
32%6%12%28%19%4
1489
21st to endNight
32%48%25%24%6%
1552
June1st to 10thNight
22%411%24%25%15%
1440
11th to 20thNight
24%47%14%23%28%
1440
21st to endNight
16%3415%29%31%
1440
July1st to 10thNight
22%6%9%15%22%25%
1400
11th to 20thNight
23%410%23%19%21%
1462
21st to endNight
25%6%15%23%17%14%
1674
August1st to 10thNight
25%6%11%23%21%14%
1602
11th to 20thNight
22%410%20%25%19%
1620
21st to endNight
22%5%7%21%26%19%
1980
September1st to 10thNight
20%5%7%16%23%29%
1800
11th to 20thNight
21%410%22%24%19%
1814
21st to endNight
20%35%21%39%12%
2056
October1st to 10thNight
27%48%25%25%12%
2160
11th to 20thNight
24%36%29%29%9%
2160
21st to endNight
28%312%29%22%5%
2376
November1st to 10thNight
30%49%28%26%4
2284
11th to 20thNight
33%412%29%19%3
2579
21st to endNight
37%49%28%19%4
2660
December1st to 10thNight
43%415%21%15%2
2660
11th to 20thNight
45%411%24%15%1
3272
21st to endNight
46%411%17%21%2
4873

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
23%13%25%25%13%2
270
11th to 20thDay
17%15%35%26%6%1
252
21st to endDay
15%14%36%27%7%1
264
February1st to 10thDay
17%28%35%17%31
240
11th to 20thDay
19%25%30%22%31
240
21st to endDay
21%26%33%14%7%
198
March1st to 10thDay
20%31%28%17%4
400
11th to 20thDay
12%28%35%19%6%
420
21st to endDay
18%30%36%13%3
462
April1st to 10thDay
17%27%30%19%6%1
420
11th to 20thDay
21%30%29%16%4
412
21st to endDay
17%24%33%18%7%1
420
May1st to 10thDay
15%24%34%19%8%
423
11th to 20thDay
12%17%26%26%16%2
553
21st to endDay
9%16%28%27%15%3
679
June1st to 10thDay
5%14%25%31%19%6%
630
11th to 20thDay
7%14%34%28%15%3
630
21st to endDay
311%28%34%19%5%
630
July1st to 10thDay
45%24%35%26%7%
621
11th to 20thDay
36%24%37%24%6%
544
21st to endDay
45%22%39%24%6%
487
August1st to 10thDay
6%7%27%37%19%4
447
11th to 20thDay
5%429%36%20%6%
437
21st to endDay
37%29%37%20%4
495
September1st to 10thDay
5%9%28%34%18%6%
450
11th to 20thDay
412%37%27%16%4
450
21st to endDay
10%19%20%30%18%4
374
October1st to 10thDay
15%15%21%24%21%5%
270
11th to 20thDay
10%16%27%27%20%1
270
21st to endDay
12%23%30%23%11%1
297
November1st to 10thDay
20%19%29%21%10%1
270
11th to 20thDay
10%21%35%19%11%3
270
21st to endDay
14%18%30%28%9%1
270
December1st to 10thDay
19%18%30%23%9%2
270
11th to 20thDay
15%18%38%22%7%
270
21st to endDay
20%20%33%22%5%1
297
January1st to 10thNight
15%11%24%36%13%2
922
11th to 20thNight
13%13%25%35%12%2
736
21st to endNight
14%9%29%38%9%2
792
February1st to 10thNight
13%10%32%34%9%1
720
11th to 20thNight
11%13%29%37%10%
704
21st to endNight
13%14%33%34%6%
592
March1st to 10thNight
12%13%28%33%12%1
720
11th to 20thNight
8%8%27%39%16%1
720
21st to endNight
13%12%28%35%11%1
784
April1st to 10thNight
14%15%27%36%8%
540
11th to 20thNight
14%13%27%33%10%2
533
21st to endNight
13%13%22%32%16%3
540
May1st to 10thNight
12%11%27%32%16%1
540
11th to 20thNight
9%7%21%36%23%5%
531
21st to endNight
11%10%19%35%22%3
584
June1st to 10thNight
5%9%17%36%30%3
540
11th to 20thNight
7%10%23%40%18%2
540
21st to endNight
4418%39%33%2
540
July1st to 10thNight
4311%36%41%5%
525
11th to 20thNight
2211%40%38%7%
522
21st to endNight
317%37%47%5%
591
August1st to 10thNight
5%29%41%39%4
537
11th to 20thNight
3210%43%38%3
534
21st to endNight
4212%38%36%8%
594
September1st to 10thNight
6%313%39%35%4
540
11th to 20thNight
5%416%42%28%5%
554
21st to endNight
7%7%19%31%28%8%
720
October1st to 10thNight
9%7%22%37%21%4
720
11th to 20thNight
9%6%23%38%20%4
720
21st to endNight
11%9%23%33%19%4
792
November1st to 10thNight
11%12%25%31%19%2
804
11th to 20thNight
12%12%30%31%13%2
950
21st to endNight
14%11%24%36%13%1
950
December1st to 10thNight
15%10%29%34%11%1
950
11th to 20thNight
18%11%28%31%11%1
950
21st to endNight
18%12%33%30%6%1
1045
Page generated at 2024-01-11 20:33:51. Version ac07

Copyright 2024 Attilla Danko


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