Lemon Lake County Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lemon Lake County Park clear sky chart from 2005-11-06 to 2024-01-13.

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
35%
24545
17%
74651
11%
24489
42%
24489
22%
50884

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
18%
950
13%
2648
4%
946
27%
946
15%
1995
January11th to 20thNight
17%
915
10%
2561
4%
915
23%
915
13%
2005
January21st to endNight
18%
990
11%
2747
3%
990
24%
990
14%
2131
February1st to 10thNight
17%
804
10%
2244
3%
804
23%
804
15%
1717
February11th to 20thNight
24%
700
18%
2099
7%
700
33%
700
18%
1467
February21st to endNight
18%
592
17%
1776
5%
592
29%
592
16%
1293
March1st to 10thNight
23%
720
13%
2160
7%
720
28%
720
17%
1565
March11th to 20thNight
28%
720
19%
2106
9%
720
37%
720
25%
1379
March21st to endNight
26%
622
15%
2008
9%
622
33%
622
16%
1471
April1st to 10thNight
27%
540
16%
1800
10%
540
38%
540
21%
1176
April11th to 20thNight
30%
533
19%
1775
13%
533
40%
533
20%
1183
April21st to endNight
30%
540
16%
1679
7%
540
39%
540
20%
1157
May1st to 10thNight
34%
540
15%
1620
8%
540
39%
540
22%
1124
May11th to 20thNight
41%
531
16%
1544
9%
531
48%
531
23%
1055
May21st to endNight
50%
583
16%
1552
9%
582
55%
582
28%
1044
June1st to 10thNight
55%
540
18%
1440
12%
540
60%
540
37%
883
June11th to 20thNight
49%
540
20%
1440
13%
540
54%
540
35%
893
June21st to endNight
49%
540
17%
1440
10%
540
54%
540
29%
964
July1st to 10thNight
64%
525
17%
1400
14%
525
66%
525
39%
848
July11th to 20thNight
65%
522
22%
1392
17%
522
68%
522
42%
818
July21st to endNight
70%
591
23%
1487
17%
558
73%
558
44%
860
August1st to 10thNight
72%
537
23%
1525
20%
534
73%
534
38%
906
August11th to 20thNight
70%
534
21%
1730
22%
534
72%
534
35%
978
August21st to endNight
65%
594
23%
1980
24%
594
68%
594
35%
1101
September1st to 10thNight
59%
540
24%
1800
23%
540
64%
540
31%
1031
September11th to 20thNight
63%
666
33%
1926
28%
666
67%
666
39%
1098
September21st to endNight
53%
720
25%
1980
17%
720
58%
720
33%
1230
October1st to 10thNight
48%
720
24%
1980
18%
720
53%
720
32%
1239
October11th to 20thNight
31%
720
21%
2188
11%
720
43%
720
24%
1399
October21st to endNight
27%
792
17%
2574
11%
792
36%
792
19%
1738
November1st to 10thNight
31%
740
24%
2406
16%
740
43%
740
25%
1475
November11th to 20thNight
25%
760
18%
2470
8%
760
36%
760
18%
1658
November21st to endNight
26%
760
19%
2470
11%
760
36%
760
18%
1700
December1st to 10thNight
19%
935
13%
2645
4%
935
27%
935
16%
1950
December11th to 20thNight
21%
950
13%
3209
5%
948
28%
948
14%
2342
December21st to endNight
14%
1039
5%
4850
3%
1026
19%
1026
6%
4011

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
14%9%47%5%35%5%5%7%36%
74820
Night
15%9%46%5%3445%7%38%
74937
TransparencyDay
46%6%12%21%12%2
74521
Night
46%6%12%21%14%2
74757
SeeingDay
16%11%30%25%14%5%
14587
Night
18%10%31%29%12%1
24555

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
15%14%7%9%6%35%5%5%6%26%
1517
11th to 20thDay
15%16%8%11%7%46%446%20%
1456
21st to endDay
14%17%7%12%434446%23%
1606
February1st to 10thDay
18%13%6%8%7%45%35%6%24%
1714
11th to 20thDay
15%11%5%8%7%35%45%7%31%
1748
21st to endDay
17%13%7%10%6%2445%6%26%
1480
March1st to 10thDay
19%12%5%7%7%445%45%29%
1800
11th to 20thDay
14%10%5%6%6%35%5%6%7%33%
1853
21st to endDay
22%11%5%8%6%345%46%26%
2362
April1st to 10thDay
16%11%46%6%35%45%7%32%
2160
11th to 20thDay
17%10%36%6%35%45%7%37%
2134
21st to endDay
21%8%37%5%45%45%7%32%
2281
May1st to 10thDay
17%9%37%6%35%5%6%8%31%
2340
11th to 20thDay
18%6%37%5%3445%8%35%
2347
21st to endDay
12%5%36%5%45%6%6%8%39%
2725
June1st to 10thDay
11%425%5%45%6%6%8%44%
2520
11th to 20thDay
9%5%25%5%35%5%6%9%46%
2520
21st to endDay
10%5%36%6%46%6%7%9%38%
2520
July1st to 10thDay
7%435%5%36%6%7%9%45%
2520
11th to 20thDay
10%425%5%45%5%6%9%45%
2520
21st to endDay
6%5%25%5%46%5%7%9%44%
2743
August1st to 10thDay
7%435%5%35%6%6%9%46%
2402
11th to 20thDay
8%5%26%6%45%6%6%8%44%
2168
21st to endDay
8%4245%45%5%6%10%48%
2376
September1st to 10thDay
11%5%245%35%46%8%46%
2160
11th to 20thDay
11%5%25%43446%8%48%
2014
21st to endDay
10%5%25%5%35%6%6%9%44%
1980
October1st to 10thDay
12%7%35%5%345%5%7%45%
1980
11th to 20thDay
20%7%26%5%336%5%7%35%
1769
21st to endDay
21%9%37%5%445%5%6%31%
1782
November1st to 10thDay
13%7%35%5%2445%8%45%
1672
11th to 20thDay
18%8%48%5%3435%7%35%
1710
21st to endDay
18%11%38%5%34445%35%
1710
December1st to 10thDay
16%14%5%8%6%45%445%28%
1530
11th to 20thDay
13%13%6%10%7%35%5%47%27%
1918
21st to endDay
22%22%7%12%6%2444313%
2783
January1st to 10thNight
16%13%5%9%7%34445%31%
2648
11th to 20thNight
17%14%6%11%6%34445%26%
2561
21st to endNight
16%14%7%9%6%45%345%26%
2747
February1st to 10thNight
18%14%5%8%7%34446%28%
2244
11th to 20thNight
15%10%5%6%5%45%447%35%
2098
21st to endNight
20%12%5%7%5%2345%5%32%
1776
March1st to 10thNight
16%12%47%7%345%45%33%
2160
11th to 20thNight
14%8%35%5%35%46%8%40%
2106
21st to endNight
20%9%5%6%5%345%5%6%31%
2008
April1st to 10thNight
15%7%36%6%35%46%8%38%
1800
11th to 20thNight
17%8%37%5%25%447%38%
1775
21st to endNight
18%7%36%6%36%45%6%36%
1679
May1st to 10thNight
18%7%36%445%5%6%8%35%
1620
11th to 20thNight
16%7%35%5%35%5%5%8%39%
1543
21st to endNight
10%5%26%6%46%6%6%9%40%
1551
June1st to 10thNight
9%425%5%345%5%10%49%
1440
11th to 20thNight
7%6%25%5%445%5%10%47%
1440
21st to endNight
11%5%35%7%35%6%6%7%42%
1440
July1st to 10thNight
6%5%25%5%245%5%9%52%
1440
11th to 20thNight
8%32443446%8%55%
1440
21st to endNight
4424435%5%7%9%53%
1575
August1st to 10thNight
7%3145%35%5%7%10%50%
1534
11th to 20thNight
6%5%245%35%5%5%9%51%
1730
21st to endNight
8%4245%2445%8%53%
1980
September1st to 10thNight
10%5%345%3345%6%51%
1800
11th to 20thNight
9%4244245%6%8%54%
1926
21st to endNight
9%6%245%45%5%5%8%48%
1980
October1st to 10thNight
12%5%25%5%3445%7%50%
1980
11th to 20thNight
17%7%35%433346%44%
2188
21st to endNight
21%8%36%5%24447%37%
2574
November1st to 10thNight
13%7%35%5%3435%7%45%
2406
11th to 20thNight
15%9%37%5%345%5%7%36%
2470
21st to endNight
19%10%46%5%34445%37%
2470
December1st to 10thNight
17%12%48%5%3445%7%31%
2645
11th to 20thNight
16%13%5%8%5%35%445%31%
3279
21st to endNight
24%18%6%10%6%34445%16%
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
58%6%12%14%10%
1518
11th to 20thDay
66%6%11%12%4
1456
21st to endDay
63%5%11%14%7%
1606
February1st to 10thDay
62%313%14%7%2
1714
11th to 20thDay
54%5%10%20%9%1
1758
21st to endDay
58%7%9%19%6%2
1480
March1st to 10thDay
56%6%10%20%7%1
1800
11th to 20thDay
50%6%12%21%10%1
1853
21st to endDay
61%5%11%18%5%1
2362
April1st to 10thDay
51%5%11%20%12%
2160
11th to 20thDay
47%6%10%21%12%3
2134
21st to endDay
51%6%14%16%11%2
2281
May1st to 10thDay
50%7%12%22%8%
2340
11th to 20thDay
48%7%13%20%12%1
2351
21st to endDay
41%8%13%20%16%2
2725
June1st to 10thDay
34%9%12%24%18%2
2520
11th to 20thDay
34%7%12%23%20%3
2520
21st to endDay
40%8%16%19%15%2
2520
July1st to 10thDay
34%8%13%24%17%4
2451
11th to 20thDay
33%8%15%26%15%2
2445
21st to endDay
34%9%16%23%16%3
2591
August1st to 10thDay
33%7%17%27%14%2
2387
11th to 20thDay
35%7%15%25%17%1
2168
21st to endDay
31%7%14%25%18%5%
2376
September1st to 10thDay
36%7%13%24%15%4
2160
11th to 20thDay
33%7%12%25%19%4
2014
21st to endDay
35%6%12%26%20%2
1980
October1st to 10thDay
39%6%12%24%17%2
1980
11th to 20thDay
46%6%11%21%14%1
1769
21st to endDay
53%5%12%20%9%1
1782
November1st to 10thDay
38%6%16%23%16%2
1672
11th to 20thDay
49%5%12%21%11%1
1710
21st to endDay
52%6%10%21%10%
1710
December1st to 10thDay
58%5%12%17%7%
1530
11th to 20thDay
58%6%11%19%6%
1915
21st to endDay
76%5%8%8%3
2783
January1st to 10thNight
57%5%9%18%10%1
2648
11th to 20thNight
61%5%14%12%7%
2561
21st to endNight
60%411%16%8%1
2747
February1st to 10thNight
59%411%16%8%2
2244
11th to 20thNight
50%5%12%19%12%2
2099
21st to endNight
54%5%10%18%10%3
1776
March1st to 10thNight
53%5%11%20%10%1
2160
11th to 20thNight
42%5%14%20%15%3
2106
21st to endNight
53%7%11%19%9%1
2008
April1st to 10thNight
45%5%13%22%13%1
1800
11th to 20thNight
46%6%8%20%16%4
1775
21st to endNight
47%7%10%19%14%3
1679
May1st to 10thNight
47%7%12%22%11%
1620
11th to 20thNight
43%9%12%20%16%1
1544
21st to endNight
40%8%14%18%16%4
1552
June1st to 10thNight
32%7%12%26%21%3
1440
11th to 20thNight
33%7%11%23%23%3
1440
21st to endNight
39%9%14%22%14%3
1440
July1st to 10thNight
30%7%15%27%17%4
1400
11th to 20thNight
28%6%14%26%23%3
1392
21st to endNight
25%7%19%26%17%5%
1487
August1st to 10thNight
28%9%15%30%17%1
1525
11th to 20thNight
29%7%16%25%20%2
1730
21st to endNight
29%7%11%27%21%5%
1980
September1st to 10thNight
32%7%12%24%19%6%
1800
11th to 20thNight
28%6%10%27%25%4
1926
21st to endNight
36%5%11%27%19%3
1980
October1st to 10thNight
36%6%10%25%22%2
1980
11th to 20thNight
41%6%10%24%19%2
2188
21st to endNight
49%411%21%13%2
2574
November1st to 10thNight
39%5%10%25%18%3
2406
11th to 20thNight
47%6%12%21%13%2
2470
21st to endNight
50%5%11%24%11%
2470
December1st to 10thNight
53%6%11%20%9%1
2645
11th to 20thNight
55%5%13%17%10%1
3281
21st to endNight
72%5%10%10%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
21%14%34%24%6%1
270
11th to 20thDay
25%13%38%17%5%1
246
21st to endDay
18%20%35%20%7%
264
February1st to 10thDay
25%20%38%16%1
240
11th to 20thDay
27%15%38%15%5%1
240
21st to endDay
24%20%43%11%2
198
March1st to 10thDay
24%20%36%19%2
240
11th to 20thDay
24%13%37%20%6%
293
21st to endDay
28%18%27%19%6%
462
April1st to 10thDay
21%15%34%21%7%1
420
11th to 20thDay
22%16%31%16%13%2
412
21st to endDay
25%14%37%15%8%2
420
May1st to 10thDay
23%14%31%20%10%3
423
11th to 20thDay
22%8%32%21%15%3
493
21st to endDay
14%8%29%26%15%7%
679
June1st to 10thDay
10%8%30%30%16%6%
630
11th to 20thDay
13%6%32%28%18%4
630
21st to endDay
12%8%32%30%12%5%
630
July1st to 10thDay
8%5%22%30%20%15%
621
11th to 20thDay
10%6%24%31%20%10%
618
21st to endDay
8%427%32%22%7%
684
August1st to 10thDay
7%317%32%27%13%
521
11th to 20thDay
8%5%21%28%26%13%
439
21st to endDay
8%318%35%25%11%
495
September1st to 10thDay
12%6%20%33%20%9%
450
11th to 20thDay
11%6%16%28%26%13%
450
21st to endDay
11%9%25%28%18%8%
450
October1st to 10thDay
14%7%30%29%16%4
450
11th to 20thDay
19%24%27%24%6%
275
21st to endDay
33%12%36%15%31
297
November1st to 10thDay
14%13%38%22%10%3
270
11th to 20thDay
22%16%37%16%8%1
270
21st to endDay
25%12%37%21%4
270
December1st to 10thDay
19%20%37%17%7%
270
11th to 20thDay
19%21%37%17%6%
270
21st to endDay
26%21%36%15%2
297
January1st to 10thNight
21%16%36%23%4
950
11th to 20thNight
22%15%38%20%41
915
21st to endNight
21%14%36%24%4
990
February1st to 10thNight
25%12%40%20%3
804
11th to 20thNight
21%16%35%25%4
703
21st to endNight
26%14%38%20%3
592
March1st to 10thNight
22%14%36%23%5%
720
11th to 20thNight
18%11%39%24%7%
720
21st to endNight
23%12%35%23%7%
622
April1st to 10thNight
18%13%39%24%6%1
540
11th to 20thNight
20%12%35%25%8%1
533
21st to endNight
22%8%34%28%7%1
540
May1st to 10thNight
20%7%35%27%10%1
540
11th to 20thNight
19%5%28%34%14%1
531
21st to endNight
12%327%38%19%1
584
June1st to 10thNight
10%323%47%16%
540
11th to 20thNight
10%331%39%15%1
540
21st to endNight
10%5%27%38%18%1
540
July1st to 10thNight
7%217%43%26%4
525
11th to 20thNight
7%318%41%28%4
522
21st to endNight
5%217%48%27%1
591
August1st to 10thNight
6%211%47%30%4
537
11th to 20thNight
7%114%43%31%5%
534
21st to endNight
8%218%39%30%3
594
September1st to 10thNight
12%418%37%24%4
540
11th to 20thNight
8%419%38%28%4
666
21st to endNight
10%7%24%32%24%3
720
October1st to 10thNight
13%6%27%35%18%2
720
11th to 20thNight
20%14%31%26%8%
720
21st to endNight
25%14%31%23%6%
792
November1st to 10thNight
17%11%37%24%10%1
740
11th to 20thNight
18%17%36%24%5%
760
21st to endNight
22%14%34%24%6%
760
December1st to 10thNight
23%14%37%21%4
935
11th to 20thNight
23%11%37%24%4
950
21st to endNight
28%15%34%21%2
1045
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