The Meadow
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the The Meadow clear sky chart from 2005-11-06 to 2024-02-20.

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
36%
25001
16%
80412
9%
24908
42%
24908
21%
54600

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
27%
941
10%
4393
5%
926
34%
926
10%
3320
January11th to 20thNight
24%
947
10%
4368
5%
930
29%
930
9%
3286
January21st to endNight
22%
1029
7%
4509
3%
1023
27%
1023
9%
3422
February1st to 10thNight
25%
950
15%
2470
4%
950
32%
950
21%
1790
February11th to 20thNight
26%
927
17%
2398
5%
923
34%
923
25%
1657
February21st to endNight
26%
653
17%
1837
5%
653
36%
653
19%
1324
March1st to 10thNight
29%
639
14%
2079
9%
639
35%
639
18%
1422
March11th to 20thNight
30%
540
19%
1980
11%
540
41%
540
19%
1279
March21st to endNight
32%
594
17%
2129
13%
594
41%
594
18%
1425
April1st to 10thNight
26%
540
16%
1800
9%
540
37%
540
20%
1204
April11th to 20thNight
31%
533
16%
1775
11%
533
40%
533
17%
1248
April21st to endNight
31%
540
17%
1652
11%
540
40%
540
21%
1122
May1st to 10thNight
32%
540
14%
1490
8%
540
38%
540
23%
1033
May11th to 20thNight
40%
531
20%
1417
9%
531
47%
531
29%
945
May21st to endNight
47%
584
14%
1552
6%
582
51%
582
27%
1041
June1st to 10thNight
49%
540
16%
1440
7%
540
54%
540
36%
885
June11th to 20thNight
44%
540
15%
1440
5%
540
49%
540
33%
911
June21st to endNight
59%
540
18%
1440
9%
540
62%
540
40%
867
July1st to 10thNight
65%
525
17%
1400
9%
525
67%
525
48%
780
July11th to 20thNight
64%
522
20%
1392
10%
522
67%
522
45%
792
July21st to endNight
66%
591
23%
1487
13%
558
69%
558
51%
802
August1st to 10thNight
65%
537
21%
1588
18%
534
67%
534
35%
938
August11th to 20thNight
60%
534
24%
1600
21%
534
67%
534
36%
933
August21st to endNight
56%
594
22%
1923
22%
594
62%
594
36%
1069
September1st to 10thNight
55%
540
22%
1800
22%
540
62%
540
33%
1004
September11th to 20thNight
50%
540
26%
1800
21%
540
61%
540
34%
994
September21st to endNight
41%
634
21%
2055
13%
634
50%
634
30%
1204
October1st to 10thNight
43%
720
22%
2160
14%
720
49%
720
31%
1316
October11th to 20thNight
32%
720
21%
2160
10%
720
41%
720
24%
1397
October21st to endNight
32%
792
17%
2429
10%
792
39%
792
20%
1662
November1st to 10thNight
32%
807
21%
2473
13%
807
41%
807
25%
1601
November11th to 20thNight
27%
950
15%
2660
7%
950
34%
950
18%
1944
November21st to endNight
27%
950
17%
2660
8%
950
34%
950
22%
1850
December1st to 10thNight
26%
950
10%
2660
4%
950
31%
950
18%
1976
December11th to 20thNight
20%
949
12%
3197
4%
948
28%
948
12%
2395
December21st to endNight
18%
1038
7%
4799
3%
1026
25%
1026
7%
3762

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
13%9%47%6%35%5%5%7%36%
78325
Night
12%9%48%6%3445%6%37%
80921
TransparencyDay
48%5%13%23%10%1
78025
Night
48%412%23%11%1
80741
SeeingDay
16%10%30%26%14%4
14943
Night
16%9%31%32%11%1
25037

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%16%7%17%6%34446%21%
2527
11th to 20thDay
5%13%5%12%13%5%8%9%6%420%
2530
21st to endDay
10%19%8%12%6%4445%6%23%
3103
February1st to 10thDay
8%10%6%9%8%47%6%5%7%30%
1710
11th to 20thDay
9%10%5%10%6%46%5%5%6%34%
1655
21st to endDay
12%11%5%8%8%45%5%47%31%
1417
March1st to 10thDay
13%12%6%7%7%3445%6%33%
1898
11th to 20thDay
15%10%47%5%35%45%8%35%
1980
21st to endDay
19%11%46%6%36%447%29%
2226
April1st to 10thDay
18%9%5%7%5%3436%6%34%
2160
11th to 20thDay
20%11%5%6%6%34446%32%
2134
21st to endDay
20%11%46%5%45%5%6%6%28%
2305
May1st to 10thDay
16%9%37%5%35%5%5%7%33%
2469
11th to 20thDay
17%7%36%5%35%5%5%7%38%
2479
21st to endDay
15%7%36%7%45%45%7%37%
2725
June1st to 10thDay
12%5%25%5%35%5%5%9%46%
2520
11th to 20thDay
12%6%36%5%45%5%6%10%39%
2520
21st to endDay
10%426%6%45%6%7%9%41%
2520
July1st to 10thDay
7%4245%346%7%10%47%
2520
11th to 20thDay
8%324445%5%6%9%51%
2520
21st to endDay
7%3246%45%6%6%9%48%
2743
August1st to 10thDay
9%5%35%7%45%7%8%9%39%
2339
11th to 20thDay
14%6%35%5%345%6%6%43%
2301
21st to endDay
10%5%245%3345%8%51%
2431
September1st to 10thDay
13%6%35%5%3445%7%46%
2160
11th to 20thDay
14%6%245%335%5%8%45%
2160
21st to endDay
15%7%26%5%3446%7%41%
1885
October1st to 10thDay
16%6%25%5%3445%6%43%
1800
11th to 20thDay
16%10%36%5%35%45%6%37%
1800
21st to endDay
17%13%5%7%424446%35%
1926
November1st to 10thDay
12%10%5%8%6%345%47%36%
1601
11th to 20thDay
13%12%8%9%7%345%5%6%28%
1520
21st to endDay
13%12%48%5%3345%7%36%
1520
December1st to 10thDay
12%13%5%10%10%5%5%5%46%25%
1520
11th to 20thDay
10%11%7%11%8%45%6%5%6%27%
1918
21st to endDay
19%16%7%16%7%3343417%
2783
January1st to 10thNight
9%15%8%14%8%45%34425%
4428
11th to 20thNight
8%11%5%12%10%5%8%9%7%5%21%
4440
21st to endNight
11%19%9%12%6%3444424%
4562
February1st to 10thNight
6%11%6%10%8%5%5%45%7%33%
2470
11th to 20thNight
6%9%48%6%5%6%5%5%8%38%
2397
21st to endNight
12%10%49%8%45%5%35%35%
1837
March1st to 10thNight
12%9%5%7%7%345%46%37%
2079
11th to 20thNight
12%10%47%6%34347%39%
1980
21st to endNight
17%10%46%5%345%5%8%34%
2129
April1st to 10thNight
16%11%36%5%2445%8%36%
1800
11th to 20thNight
22%9%46%434445%33%
1775
21st to endNight
18%9%46%5%35%45%6%37%
1652
May1st to 10thNight
18%8%35%5%3445%7%38%
1490
11th to 20thNight
16%5%24436%46%7%42%
1416
21st to endNight
11%6%36%6%35%5%6%7%42%
1551
June1st to 10thNight
11%4345%35%5%7%8%47%
1440
11th to 20thNight
10%426%5%445%6%8%46%
1440
21st to endNight
7%424435%5%6%9%51%
1440
July1st to 10thNight
5%3234245%5%10%57%
1440
11th to 20thNight
5%3244345%7%10%55%
1440
21st to endNight
5%31432446%10%59%
1575
August1st to 10thNight
6%5%26%6%445%6%8%49%
1597
11th to 20thNight
12%424433448%53%
1600
21st to endNight
8%5%3442445%6%56%
1923
September1st to 10thNight
10%424434447%52%
1800
11th to 20thNight
11%4344235%48%53%
1800
21st to endNight
14%5%2443445%7%48%
2055
October1st to 10thNight
14%6%25%5%24446%49%
2160
11th to 20thNight
16%9%35%5%33447%41%
2160
21st to endNight
17%11%46%434447%37%
2429
November1st to 10thNight
12%9%45%6%3445%6%42%
2473
11th to 20thNight
13%11%5%10%6%45%45%6%32%
2660
21st to endNight
14%10%48%6%34447%37%
2660
December1st to 10thNight
11%11%5%11%8%35%45%6%30%
2660
11th to 20thNight
11%13%6%10%9%45%5%47%26%
3279
21st to endNight
22%14%6%12%7%34445%20%
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
66%410%16%3
2528
11th to 20thDay
65%49%16%6%
2530
21st to endDay
62%414%16%4
3103
February1st to 10thDay
52%414%19%10%1
1710
11th to 20thDay
50%5%12%24%9%1
1664
21st to endDay
53%5%11%19%11%
1417
March1st to 10thDay
52%5%15%19%8%1
1898
11th to 20thDay
49%413%24%9%1
1980
21st to endDay
55%411%22%8%1
2226
April1st to 10thDay
50%411%22%12%1
2160
11th to 20thDay
55%49%19%11%2
2134
21st to endDay
54%5%12%19%8%1
2305
May1st to 10thDay
49%6%12%22%9%1
2469
11th to 20thDay
46%5%13%23%11%1
2483
21st to endDay
46%6%10%23%12%2
2725
June1st to 10thDay
36%5%15%30%13%1
2520
11th to 20thDay
41%6%15%23%14%1
2520
21st to endDay
39%6%15%27%10%2
2520
July1st to 10thDay
31%7%16%31%14%1
2451
11th to 20thDay
30%6%15%28%19%3
2445
21st to endDay
31%7%16%29%16%2
2591
August1st to 10thDay
38%8%15%28%9%3
2324
11th to 20thDay
39%5%14%30%11%
2301
21st to endDay
32%5%14%31%18%1
2431
September1st to 10thDay
37%5%12%31%14%
2160
11th to 20thDay
38%416%33%9%1
2160
21st to endDay
42%5%12%33%9%
1885
October1st to 10thDay
42%412%30%12%1
1800
11th to 20thDay
48%314%23%11%1
1800
21st to endDay
51%412%23%9%1
1926
November1st to 10thDay
49%412%19%13%2
1601
11th to 20thDay
57%412%16%9%1
1520
21st to endDay
49%5%18%20%7%2
1520
December1st to 10thDay
60%5%15%14%5%
1520
11th to 20thDay
58%417%15%5%1
1915
21st to endDay
72%38%12%5%
2783
January1st to 10thNight
63%310%18%5%1
4428
11th to 20thNight
62%5%12%15%6%
4440
21st to endNight
64%39%18%5%1
4562
February1st to 10thNight
51%411%23%10%1
2470
11th to 20thNight
44%5%15%26%9%1
2398
21st to endNight
51%5%10%21%11%2
1837
March1st to 10thNight
49%5%14%23%9%1
2079
11th to 20thNight
47%411%22%15%1
1980
21st to endNight
50%411%22%12%1
2129
April1st to 10thNight
48%49%22%16%1
1800
11th to 20thNight
53%48%19%13%2
1775
21st to endNight
48%49%22%14%2
1652
May1st to 10thNight
47%5%13%21%13%1
1490
11th to 20thNight
40%6%12%24%15%2
1417
21st to endNight
42%6%12%22%17%2
1552
June1st to 10thNight
34%5%13%30%18%1
1440
11th to 20thNight
36%6%14%23%18%3
1440
21st to endNight
29%6%15%32%14%3
1440
July1st to 10thNight
23%5%15%35%20%2
1400
11th to 20thNight
24%6%16%31%19%3
1392
21st to endNight
22%418%34%18%5%
1487
August1st to 10thNight
32%5%14%29%16%4
1588
11th to 20thNight
32%5%15%31%16%1
1600
21st to endNight
30%5%14%29%17%4
1923
September1st to 10thNight
31%5%11%35%16%1
1800
11th to 20thNight
31%416%32%16%
1800
21st to endNight
35%414%32%14%1
2055
October1st to 10thNight
38%310%32%14%2
2160
11th to 20thNight
44%313%24%14%1
2160
21st to endNight
49%412%23%11%1
2429
November1st to 10thNight
44%413%24%15%1
2473
11th to 20thNight
53%5%12%17%11%1
2660
21st to endNight
49%416%23%8%1
2660
December1st to 10thNight
55%5%15%19%6%
2660
11th to 20thNight
59%413%17%6%1
3281
21st to endNight
67%311%15%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
14%16%30%28%10%2
270
11th to 20thDay
17%15%39%23%5%1
270
21st to endDay
13%10%38%25%11%2
297
February1st to 10thDay
13%15%49%16%6%1
270
11th to 20thDay
13%21%40%20%5%1
267
21st to endDay
19%18%36%26%1
198
March1st to 10thDay
16%16%43%17%7%1
240
11th to 20thDay
20%11%37%22%8%3
240
21st to endDay
25%15%27%21%9%4
312
April1st to 10thDay
26%15%31%21%7%
420
11th to 20thDay
27%15%23%26%8%1
412
21st to endDay
26%12%28%21%10%2
565
May1st to 10thDay
20%13%33%24%9%2
603
11th to 20thDay
20%12%28%23%13%3
625
21st to endDay
19%8%28%26%16%4
679
June1st to 10thDay
11%8%25%34%18%4
630
11th to 20thDay
14%9%32%31%12%2
630
21st to endDay
11%7%28%31%17%6%
630
July1st to 10thDay
8%321%31%25%11%
621
11th to 20thDay
9%6%27%31%20%8%
618
21st to endDay
7%5%24%36%21%8%
684
August1st to 10thDay
11%420%34%23%7%
626
11th to 20thDay
15%5%20%30%26%5%
615
21st to endDay
12%424%32%23%5%
550
September1st to 10thDay
15%7%26%31%16%5%
450
11th to 20thDay
14%427%31%20%3
450
21st to endDay
21%15%26%24%11%3
287
October1st to 10thDay
16%14%26%24%16%3
270
11th to 20thDay
21%17%33%22%7%
270
21st to endDay
27%15%36%15%6%2
297
November1st to 10thDay
18%14%36%20%12%1
270
11th to 20thDay
19%17%39%20%5%
270
21st to endDay
24%13%37%20%5%
270
December1st to 10thDay
14%10%44%23%7%1
270
11th to 20thDay
19%16%38%20%6%
270
21st to endDay
26%18%36%18%21
297
January1st to 10thNight
12%13%36%30%9%1
950
11th to 20thNight
16%12%35%30%6%1
950
21st to endNight
18%11%34%29%7%1
1045
February1st to 10thNight
11%13%41%27%7%1
950
11th to 20thNight
12%13%41%26%7%1
927
21st to endNight
18%13%32%29%8%
653
March1st to 10thNight
17%12%35%27%9%1
639
11th to 20thNight
17%11%35%29%6%1
540
21st to endNight
21%10%31%26%9%2
594
April1st to 10thNight
21%13%36%24%6%
540
11th to 20thNight
27%9%28%27%8%1
533
21st to endNight
21%10%32%27%10%1
540
May1st to 10thNight
21%10%30%33%5%1
540
11th to 20thNight
19%8%29%33%10%1
531
21st to endNight
12%9%25%38%15%
584
June1st to 10thNight
13%427%41%14%1
540
11th to 20thNight
12%433%41%10%1
540
21st to endNight
8%422%46%17%1
540
July1st to 10thNight
6%220%41%28%2
525
11th to 20thNight
6%421%47%20%2
522
21st to endNight
5%320%48%22%2
591
August1st to 10thNight
6%5%14%49%25%1
537
11th to 20thNight
14%218%36%27%3
534
21st to endNight
10%324%37%24%2
594
September1st to 10thNight
11%5%23%41%16%4
540
11th to 20thNight
11%7%26%36%18%2
540
21st to endNight
16%10%30%30%13%1
634
October1st to 10thNight
17%8%29%31%14%2
720
11th to 20thNight
19%11%33%29%7%1
720
21st to endNight
23%12%26%30%8%
792
November1st to 10thNight
19%9%34%29%8%1
807
11th to 20thNight
18%13%35%27%7%1
950
21st to endNight
18%14%34%26%7%1
950
December1st to 10thNight
17%9%36%30%7%1
950
11th to 20thNight
19%9%39%25%6%1
950
21st to endNight
24%11%35%25%5%
1045
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