Richland Creek Recreation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Richland Creek Recreation Area clear sky chart from 2005-11-06 to 2024-01-22.

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
37%
24249
24%
74777
14%
24186
48%
24186
27%
45178

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
19%
949
25%
2458
5%
946
34%
946
23%
1610
January11th to 20thNight
17%
950
25%
2470
5%
950
30%
950
22%
1607
January21st to endNight
20%
1000
27%
2600
7%
1000
34%
1000
26%
1658
February1st to 10thNight
16%
900
20%
2340
4%
900
26%
900
19%
1611
February11th to 20thNight
13%
807
19%
2202
4%
803
23%
803
20%
1436
February21st to endNight
16%
539
24%
1723
7%
539
32%
539
17%
1095
March1st to 10thNight
24%
540
23%
1980
11%
540
38%
540
18%
1208
March11th to 20thNight
24%
540
18%
1980
11%
540
35%
540
17%
1278
March21st to endNight
22%
594
16%
2178
9%
594
33%
594
16%
1425
April1st to 10thNight
26%
540
24%
1819
12%
540
43%
540
22%
1061
April11th to 20thNight
30%
533
26%
1775
16%
533
45%
533
23%
1058
April21st to endNight
25%
540
21%
1800
9%
540
43%
540
22%
1112
May1st to 10thNight
31%
540
19%
1742
11%
540
43%
540
26%
1056
May11th to 20thNight
41%
531
21%
1593
17%
531
47%
531
30%
973
May21st to endNight
46%
584
18%
1746
11%
582
54%
582
26%
1126
June1st to 10thNight
63%
540
23%
1450
18%
540
67%
540
42%
836
June11th to 20thNight
61%
540
27%
1440
19%
540
68%
540
49%
786
June21st to endNight
65%
540
27%
1550
22%
540
70%
540
47%
820
July1st to 10thNight
69%
525
19%
1575
18%
525
72%
525
38%
886
July11th to 20thNight
73%
522
22%
1566
22%
522
77%
522
45%
827
July21st to endNight
72%
591
26%
1673
25%
558
77%
558
39%
941
August1st to 10thNight
70%
537
19%
1601
20%
534
72%
534
38%
902
August11th to 20thNight
66%
534
23%
1708
24%
534
71%
534
35%
966
August21st to endNight
70%
594
24%
1980
26%
594
72%
594
36%
1077
September1st to 10thNight
69%
540
28%
1800
28%
540
74%
540
38%
964
September11th to 20thNight
62%
540
30%
1830
27%
540
69%
540
31%
1050
September21st to endNight
60%
607
30%
2047
26%
607
66%
607
38%
1068
October1st to 10thNight
53%
720
29%
2160
21%
720
60%
720
41%
1153
October11th to 20thNight
36%
720
32%
2160
15%
720
50%
720
32%
1221
October21st to endNight
31%
792
29%
2376
14%
792
44%
792
27%
1441
November1st to 10thNight
33%
740
32%
2220
15%
740
49%
740
33%
1245
November11th to 20thNight
32%
760
30%
2341
15%
760
49%
760
31%
1317
November21st to endNight
27%
878
25%
2588
11%
878
39%
878
25%
1594
December1st to 10thNight
23%
950
24%
2660
6%
950
38%
950
25%
1682
December11th to 20thNight
24%
949
23%
3128
9%
948
34%
948
19%
2020
December21st to endNight
20%
1043
15%
4518
7%
1026
34%
1026
12%
3068

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
11%7%36%5%35%5%5%7%43%
74679
Night
11%6%35%43445%7%48%
75244
TransparencyDay
40%6%11%22%17%4
74402
Night
35%5%10%24%20%5%
75041
SeeingDay
16%14%28%24%14%4
14298
Night
16%15%27%26%14%2
24253

By Month

Percentage Cloud Cover SE (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%8%46%422336%47%
1707
11th to 20thDay
12%9%36%5%34446%44%
1710
21st to endDay
13%8%35%42345%6%48%
1791
February1st to 10thDay
16%9%45%5%3324444%
1620
11th to 20thDay
13%8%48%6%3435%6%40%
1645
21st to endDay
17%11%45%5%34335%38%
1547
March1st to 10thDay
15%7%36%6%34445%44%
1980
11th to 20thDay
19%9%36%5%2344440%
1980
21st to endDay
16%10%46%6%245%46%36%
2178
April1st to 10thDay
11%8%36%6%36%5%5%5%43%
2139
11th to 20thDay
15%7%36%5%45%446%40%
2134
21st to endDay
17%7%47%6%3445%5%38%
2160
May1st to 10thDay
16%8%47%6%34446%38%
2214
11th to 20thDay
13%7%37%6%45%5%5%8%38%
2302
21st to endDay
10%7%47%7%5%6%6%6%8%34%
2531
June1st to 10thDay
8%6%346%46%7%7%9%41%
2502
11th to 20thDay
5%426%7%5%7%6%7%8%44%
2520
21st to endDay
44245%46%7%7%10%47%
2401
July1st to 10thDay
8%5%46%7%47%6%8%11%33%
2340
11th to 20thDay
5%425%7%46%6%8%9%44%
2340
21st to endDay
7%436%6%45%6%8%11%40%
2546
August1st to 10thDay
8%5%35%6%47%7%7%11%38%
2328
11th to 20thDay
10%6%35%5%45%7%6%8%41%
2190
21st to endDay
7%325%6%47%5%7%8%44%
2376
September1st to 10thDay
11%6%35%435%447%47%
2160
11th to 20thDay
12%5%24445%6%5%9%44%
2125
21st to endDay
8%5%25%425%46%7%51%
1895
October1st to 10thDay
7%5%35%435%346%54%
1800
11th to 20thDay
12%6%35%424335%56%
1800
21st to endDay
18%6%35%33334349%
1980
November1st to 10thDay
11%6%34423336%56%
1858
11th to 20thDay
8%7%35%5%34346%51%
1834
21st to endDay
14%8%35%5%3335%446%
1587
December1st to 10thDay
13%7%35%5%2445%6%47%
1520
11th to 20thDay
11%8%46%6%35%34446%
1918
21st to endDay
10%13%5%7%6%35%46%5%35%
3021
January1st to 10thNight
12%7%36%6%345%45%47%
2458
11th to 20thNight
12%7%36%5%33336%48%
2470
21st to endNight
12%7%36%424345%51%
2600
February1st to 10thNight
15%8%47%5%3435%5%40%
2340
11th to 20thNight
14%7%46%42445%6%44%
2201
21st to endNight
15%9%47%5%33445%44%
1723
March1st to 10thNight
15%7%345%34446%43%
1980
11th to 20thNight
17%9%35%434445%41%
1980
21st to endNight
14%9%46%6%34446%39%
2178
April1st to 10thNight
9%6%26%5%35%45%6%49%
1819
11th to 20thNight
11%7%37%5%2435%6%47%
1775
21st to endNight
14%7%35%43446%7%43%
1800
May1st to 10thNight
11%6%35%5%25%45%8%46%
1742
11th to 20thNight
15%6%2432345%7%48%
1593
21st to endNight
7%6%36%6%35%6%6%9%42%
1745
June1st to 10thNight
7%42443445%11%53%
1450
11th to 20thNight
5%41332347%10%57%
1440
21st to endNight
432332346%9%60%
1550
July1st to 10thNight
4425%445%5%6%11%51%
1620
11th to 20thNight
5%223435%45%11%57%
1620
21st to endNight
5%3244346%7%10%52%
1772
August1st to 10thNight
5%4245%35%7%8%11%47%
1611
11th to 20thNight
6%5%245%25%5%7%9%49%
1708
21st to endNight
6%425%4246%6%8%54%
1980
September1st to 10thNight
7%5%2443445%8%55%
1800
11th to 20thNight
10%6%25%4245%5%6%50%
1830
21st to endNight
7%5%2432345%6%58%
2047
October1st to 10thNight
7%42432345%7%59%
2160
11th to 20thNight
13%5%2442333457%
2160
21st to endNight
17%6%3431433452%
2376
November1st to 10thNight
9%6%24423345%57%
2220
11th to 20thNight
11%5%2442345%6%54%
2341
21st to endNight
13%7%35%5%33436%49%
2588
December1st to 10thNight
14%8%35%5%24345%47%
2660
11th to 20thNight
11%9%37%5%35%435%44%
3279
21st to endNight
12%11%6%7%6%34445%36%
4628

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
40%48%24%20%6%
1708
11th to 20thDay
43%47%23%20%3
1710
21st to endDay
37%39%26%20%5%
1791
February1st to 10thDay
45%310%21%17%4
1620
11th to 20thDay
46%48%21%18%4
1654
21st to endDay
49%47%16%16%8%
1547
March1st to 10thDay
43%47%18%18%10%
1980
11th to 20thDay
47%49%20%15%5%
1980
21st to endDay
49%5%10%21%13%2
2178
April1st to 10thDay
42%6%10%20%20%2
2139
11th to 20thDay
45%5%9%20%16%5%
2134
21st to endDay
47%6%8%22%15%2
2160
May1st to 10thDay
48%5%10%19%16%2
2214
11th to 20thDay
44%7%13%22%13%2
2306
21st to endDay
46%8%12%21%11%1
2531
June1st to 10thDay
37%9%14%26%13%1
2502
11th to 20thDay
35%8%15%25%15%2
2520
21st to endDay
29%9%15%27%17%4
2401
July1st to 10thDay
40%11%15%21%11%1
2276
11th to 20thDay
32%8%15%25%17%3
2271
21st to endDay
34%9%17%29%10%1
2405
August1st to 10thDay
36%9%18%26%10%
2314
11th to 20thDay
38%8%12%26%15%1
2190
21st to endDay
34%8%16%24%14%5%
2376
September1st to 10thDay
36%6%11%23%18%7%
2160
11th to 20thDay
35%6%12%20%22%4
2125
21st to endDay
32%5%8%24%27%5%
1895
October1st to 10thDay
31%5%10%24%24%7%
1800
11th to 20thDay
33%35%25%25%9%
1800
21st to endDay
40%47%23%18%8%
1980
November1st to 10thDay
32%39%25%23%9%
1858
11th to 20thDay
35%37%22%24%9%
1834
21st to endDay
42%47%19%23%5%
1587
December1st to 10thDay
39%48%25%18%6%
1520
11th to 20thDay
42%5%5%17%28%4
1915
21st to endDay
48%6%9%17%16%5%
3021
January1st to 10thNight
39%5%7%21%24%4
2458
11th to 20thNight
40%48%24%20%4
2470
21st to endNight
37%37%25%22%5%
2600
February1st to 10thNight
46%48%21%17%4
2340
11th to 20thNight
41%410%22%18%5%
2202
21st to endNight
44%46%20%18%8%
1723
March1st to 10thNight
42%47%16%20%10%
1980
11th to 20thNight
45%6%9%19%17%4
1980
21st to endNight
47%6%8%23%14%2
2178
April1st to 10thNight
35%5%11%23%21%5%
1819
11th to 20thNight
37%48%25%19%6%
1775
21st to endNight
40%6%11%26%16%2
1800
May1st to 10thNight
36%6%15%22%18%3
1742
11th to 20thNight
35%6%15%25%15%3
1594
21st to endNight
37%10%16%24%12%1
1746
June1st to 10thNight
26%6%15%33%17%2
1450
11th to 20thNight
22%6%14%38%18%3
1440
21st to endNight
21%6%16%28%22%6%
1550
July1st to 10thNight
26%9%20%25%20%1
1575
11th to 20thNight
22%7%17%30%20%4
1566
21st to endNight
24%10%16%36%14%1
1673
August1st to 10thNight
26%9%21%32%11%1
1601
11th to 20thNight
28%8%18%24%20%2
1708
21st to endNight
27%7%15%29%17%5%
1980
September1st to 10thNight
27%6%10%31%18%7%
1800
11th to 20thNight
32%7%10%21%25%4
1830
21st to endNight
26%6%9%23%30%6%
2047
October1st to 10thNight
25%5%13%25%23%9%
2160
11th to 20thNight
31%46%19%31%8%
2160
21st to endNight
37%46%22%22%9%
2376
November1st to 10thNight
30%48%25%25%8%
2220
11th to 20thNight
31%47%24%26%8%
2341
21st to endNight
38%48%20%25%5%
2588
December1st to 10thNight
40%39%21%21%6%
2660
11th to 20thNight
43%46%19%22%5%
3281
21st to endNight
49%6%8%18%15%3
4628

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
27%25%33%13%3
270
11th to 20thDay
30%32%27%10%1
270
21st to endDay
25%28%36%9%3
267
February1st to 10thDay
31%28%30%8%3
240
11th to 20thDay
29%37%25%7%1
240
21st to endDay
41%25%27%5%2
198
March1st to 10thDay
27%27%32%13%2
240
11th to 20thDay
38%21%31%10%1
240
21st to endDay
27%36%28%7%2
264
April1st to 10thDay
22%26%33%14%6%1
399
11th to 20thDay
23%25%33%14%5%1
412
21st to endDay
24%21%34%15%5%1
420
May1st to 10thDay
22%17%38%17%6%
477
11th to 20thDay
16%16%33%22%11%2
625
21st to endDay
11%13%37%24%12%4
679
June1st to 10thDay
10%7%24%34%20%6%
630
11th to 20thDay
6%5%30%37%19%3
630
21st to endDay
46%33%33%19%4
630
July1st to 10thDay
9%419%33%28%7%
621
11th to 20thDay
5%422%33%26%10%
618
21st to endDay
8%313%36%30%11%
684
August1st to 10thDay
11%216%39%27%5%
626
11th to 20thDay
14%215%35%27%7%
504
21st to endDay
10%211%34%32%11%
495
September1st to 10thDay
13%5%15%30%30%7%
450
11th to 20thDay
9%418%34%25%10%
415
21st to endDay
11%7%29%30%21%1
270
October1st to 10thDay
7%14%34%32%10%1
270
11th to 20thDay
14%18%44%17%5%1
270
21st to endDay
33%15%32%15%41
297
November1st to 10thDay
17%16%42%18%6%1
270
11th to 20thDay
18%23%40%13%42
270
21st to endDay
27%23%30%17%4
270
December1st to 10thDay
22%29%29%14%42
270
11th to 20thDay
24%29%31%12%3
270
21st to endDay
26%29%34%10%1
297
January1st to 10thNight
20%23%34%18%31
950
11th to 20thNight
22%28%30%16%3
950
21st to endNight
18%25%34%20%3
1000
February1st to 10thNight
22%25%33%18%2
900
11th to 20thNight
22%28%35%13%2
807
21st to endNight
25%27%31%17%1
539
March1st to 10thNight
22%20%31%24%4
540
11th to 20thNight
24%18%31%23%3
540
21st to endNight
21%21%33%18%6%
594
April1st to 10thNight
16%25%31%24%4
540
11th to 20thNight
17%20%29%26%8%
533
21st to endNight
17%19%37%20%7%1
540
May1st to 10thNight
13%16%37%27%8%
540
11th to 20thNight
18%11%27%26%16%1
531
21st to endNight
10%8%29%29%20%4
584
June1st to 10thNight
9%5%19%34%31%3
540
11th to 20thNight
5%425%39%24%3
540
21st to endNight
4321%39%28%4
540
July1st to 10thNight
4214%35%36%9%
525
11th to 20thNight
5%214%34%38%7%
522
21st to endNight
5%211%39%37%7%
591
August1st to 10thNight
6%112%38%36%6%
537
11th to 20thNight
9%116%37%31%6%
534
21st to endNight
8%112%38%34%7%
594
September1st to 10thNight
10%114%35%36%4
540
11th to 20thNight
13%214%36%27%7%
540
21st to endNight
10%5%20%31%31%3
607
October1st to 10thNight
9%7%25%29%26%3
720
11th to 20thNight
16%14%31%29%10%
720
21st to endNight
22%16%29%23%9%1
792
November1st to 10thNight
11%17%35%25%11%
740
11th to 20thNight
16%16%33%27%7%
760
21st to endNight
19%22%30%21%7%
878
December1st to 10thNight
22%17%35%21%6%
950
11th to 20thNight
19%21%32%23%5%
950
21st to endNight
21%24%30%21%4
1045
Page generated at 2024-01-19 08:28:33. Version ac07

Copyright 2024 Attilla Danko


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