Brooks Camp Developed Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Brooks Camp Developed Area clear sky chart from 2005-11-06 to 2024-01-12.

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
30%
22008
5%
74915
4%
21968
32%
21968
9%
59731

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
40%
936
11%
3217
7%
936
43%
936
15%
2343
January11th to 20thNight
29%
878
9%
2985
5%
878
31%
878
10%
2314
January21st to endNight
30%
880
8%
2970
5%
880
32%
880
11%
2346
February1st to 10thNight
34%
792
10%
2692
8%
792
36%
792
13%
1994
February11th to 20thNight
23%
607
6%
2360
5%
605
26%
605
6%
1920
February21st to endNight
26%
510
12%
1924
8%
510
33%
510
10%
1449
March1st to 10thNight
28%
620
9%
2241
7%
620
32%
620
11%
1700
March11th to 20thNight
38%
620
12%
1978
9%
620
41%
620
16%
1450
March21st to endNight
36%
668
8%
2150
6%
668
38%
668
11%
1690
April1st to 10thNight
26%
540
5%
1638
3%
540
27%
540
10%
1350
April11th to 20thNight
39%
533
4%
1598
3%
533
39%
533
14%
1228
April21st to endNight
36%
493
5%
1393
3%
493
38%
493
14%
1087
May1st to 10thNight
40%
360
0%
1260
0%
360
40%
360
10%
994
May11th to 20thNight
37%
354
0%
1146
0%
354
37%
354
13%
869
May21st to endNight
42%
389
0%
1069
0%
388
42%
388
15%
837
June1st to 10thNight
35%
360
0%
900
0%
360
35%
360
12%
752
June11th to 20thNight
39%
360
0%
900
0%
360
39%
360
11%
764
June21st to endNight
38%
360
0%
900
0%
360
38%
360
9%
796
July1st to 10thNight
36%
350
0%
875
0%
350
36%
350
9%
772
July11th to 20thNight
32%
348
0%
870
0%
348
32%
348
9%
759
July21st to endNight
31%
394
0%
1237
0%
372
31%
372
5%
1097
August1st to 10thNight
26%
358
0%
1246
0%
356
26%
356
5%
1085
August11th to 20thNight
22%
411
1%
1313
0%
411
22%
411
6%
1151
August21st to endNight
24%
594
2%
1782
2%
594
25%
594
5%
1586
September1st to 10thNight
25%
540
2%
1663
1%
540
25%
540
6%
1463
September11th to 20thNight
31%
578
3%
1876
3%
578
31%
578
7%
1608
September21st to endNight
25%
630
4%
2007
4%
630
26%
630
8%
1659
October1st to 10thNight
25%
630
5%
2160
4%
630
26%
630
7%
1786
October11th to 20thNight
32%
634
4%
2298
4%
634
33%
634
7%
1889
October21st to endNight
28%
891
6%
2772
4%
891
30%
891
10%
2248
November1st to 10thNight
24%
830
6%
2656
4%
830
26%
830
8%
2223
November11th to 20thNight
28%
850
6%
2976
5%
850
30%
850
8%
2417
November21st to endNight
28%
850
7%
3040
4%
850
31%
850
8%
2474
December1st to 10thNight
28%
904
8%
3154
5%
904
32%
904
10%
2515
December11th to 20thNight
28%
940
6%
3964
4%
939
29%
939
7%
3159
December21st to endNight
28%
1016
4%
5705
3%
1004
30%
1004
6%
3957

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
20%14%5%9%7%46%5%5%6%19%
74453
Night
17%14%5%9%8%46%5%5%6%21%
75314
TransparencyDay
65%10%12%9%31
74105
Night
61%10%12%10%5%1
75184
SeeingDay
25%13%23%22%13%4
17837
Night
23%12%22%25%16%3
22031

By Month

Percentage Cloud Cover NW (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
9%11%5%8%7%5%8%10%9%7%21%
949
11th to 20thDay
11%13%5%10%7%6%7%6%7%7%20%
1012
21st to endDay
11%13%5%9%8%6%8%9%7%5%19%
1386
February1st to 10thDay
10%14%5%8%9%5%7%5%7%8%21%
1265
11th to 20thDay
12%19%6%11%8%49%6%6%5%13%
1491
21st to endDay
13%14%5%10%9%46%5%6%5%23%
1332
March1st to 10thDay
11%15%48%7%45%5%47%30%
1719
11th to 20thDay
8%9%412%7%6%9%5%45%30%
1980
21st to endDay
11%18%7%10%8%5%6%44423%
2206
April1st to 10thDay
12%18%7%10%7%5%6%45%5%22%
2320
11th to 20thDay
13%14%5%9%9%45%45%5%28%
2311
21st to endDay
10%15%6%10%6%35%6%6%7%26%
2564
May1st to 10thDay
16%18%6%9%7%45%45%420%
2700
11th to 20thDay
15%15%5%8%6%3445%6%30%
2749
21st to endDay
18%11%5%8%7%45%47%7%24%
3205
June1st to 10thDay
18%13%5%9%7%45%5%5%7%22%
3060
11th to 20thDay
22%13%48%6%46%5%5%5%22%
3060
21st to endDay
27%12%5%8%7%45%6%5%6%16%
3060
July1st to 10thDay
30%12%48%6%45%446%16%
3060
11th to 20thDay
33%11%47%6%35%5%5%5%16%
3060
21st to endDay
35%12%5%7%7%45%445%12%
3007
August1st to 10thDay
35%13%49%6%45%45%5%11%
2686
11th to 20thDay
31%15%48%6%4444414%
2586
21st to endDay
31%13%49%8%46%5%45%12%
2574
September1st to 10thDay
32%13%5%10%6%45%44413%
2297
11th to 20thDay
29%13%5%8%7%36%5%45%15%
2081
21st to endDay
26%15%47%7%3445%5%21%
1952
October1st to 10thDay
27%17%5%8%6%35%45%416%
1800
11th to 20thDay
16%16%7%9%6%5%6%45%6%21%
1662
21st to endDay
15%15%8%12%7%35%445%21%
1584
November1st to 10thDay
16%18%6%12%9%45%446%17%
1420
11th to 20thDay
12%13%6%9%8%7%10%6%6%6%18%
1204
21st to endDay
16%15%6%11%10%6%8%7%45%12%
1140
December1st to 10thDay
15%11%6%8%8%7%8%6%5%6%21%
1025
11th to 20thDay
12%17%5%8%9%5%8%7%5%8%17%
1197
21st to endDay
9%15%5%10%9%48%6%5%6%23%
1749
January1st to 10thNight
7%13%5%9%9%5%8%8%7%8%22%
3217
11th to 20thNight
11%16%5%11%9%47%7%5%5%20%
2985
21st to endNight
13%15%5%9%8%6%8%7%6%6%16%
2970
February1st to 10thNight
10%15%5%8%7%46%6%5%6%27%
2692
11th to 20thNight
14%20%6%9%8%5%8%6%45%16%
2355
21st to endNight
12%14%5%9%8%36%45%5%28%
1924
March1st to 10thNight
12%16%7%10%6%46%5%45%27%
2241
11th to 20thNight
7%11%6%10%6%6%6%45%6%32%
1978
21st to endNight
10%17%7%11%7%5%5%445%24%
2150
April1st to 10thNight
16%17%6%12%7%4345%5%21%
1638
11th to 20thNight
11%15%6%9%8%36%5%5%6%26%
1598
21st to endNight
12%14%5%8%8%446%47%27%
1393
May1st to 10thNight
19%16%48%6%45%45%7%23%
1260
11th to 20thNight
20%13%38%6%35%446%28%
1145
21st to endNight
16%12%46%8%36%6%7%8%24%
1069
June1st to 10thNight
22%11%410%7%46%5%45%23%
900
11th to 20thNight
25%10%5%8%7%35%6%6%421%
900
21st to endNight
25%11%5%8%6%46%5%6%7%17%
900
July1st to 10thNight
25%13%5%8%6%35%6%6%7%16%
900
11th to 20thNight
32%9%48%5%345%45%21%
900
21st to endNight
36%12%47%6%3445%5%14%
1309
August1st to 10thNight
38%11%46%5%3444416%
1253
11th to 20thNight
37%12%5%9%6%4434313%
1313
21st to endNight
35%12%48%7%34435%15%
1782
September1st to 10thNight
32%14%5%10%7%3434414%
1663
11th to 20thNight
28%12%5%8%6%45%5%5%5%17%
1876
21st to endNight
30%12%47%7%3433423%
2007
October1st to 10thNight
26%15%5%7%6%3444420%
2160
11th to 20thNight
19%16%5%8%7%35%5%6%6%21%
2298
21st to endNight
18%15%6%8%7%35%5%5%5%23%
2772
November1st to 10thNight
18%16%412%9%4444420%
2656
11th to 20thNight
12%13%5%8%8%6%10%6%6%6%20%
2976
21st to endNight
14%14%6%10%8%6%8%7%5%6%14%
3040
December1st to 10thNight
14%15%5%9%8%6%6%6%6%5%19%
3154
11th to 20thNight
11%16%5%12%10%6%7%6%6%7%14%
4011
21st to endNight
8%14%6%10%9%5%7%7%6%8%21%
5929

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
49%11%13%12%12%3
949
11th to 20thDay
57%11%11%11%8%2
1012
21st to endDay
57%12%12%10%7%3
1386
February1st to 10thDay
54%11%12%10%8%5%
1265
11th to 20thDay
71%8%9%8%31
1497
21st to endDay
62%11%10%12%6%
1332
March1st to 10thDay
55%9%10%16%9%2
1719
11th to 20thDay
55%8%9%16%10%2
1980
21st to endDay
64%9%7%12%5%2
2206
April1st to 10thDay
64%8%13%10%41
2320
11th to 20thDay
58%9%14%13%6%
2311
21st to endDay
57%11%14%14%41
2564
May1st to 10thDay
66%8%13%11%2
2700
11th to 20thDay
56%10%15%16%4
2752
21st to endDay
57%12%17%12%2
3206
June1st to 10thDay
62%12%15%10%1
3060
11th to 20thDay
64%11%13%9%2
3060
21st to endDay
69%13%16%2
3060
July1st to 10thDay
73%10%13%5%
2976
11th to 20thDay
70%11%13%6%
2967
21st to endDay
74%11%10%5%
2840
August1st to 10thDay
74%11%10%4
2668
11th to 20thDay
73%9%11%6%
2586
21st to endDay
75%10%9%41
2574
September1st to 10thDay
75%11%7%7%1
2297
11th to 20thDay
71%11%9%8%1
2081
21st to endDay
68%8%12%11%1
1952
October1st to 10thDay
70%9%8%9%3
1800
11th to 20thDay
64%12%14%8%3
1662
21st to endDay
64%9%13%8%5%
1584
November1st to 10thDay
68%11%10%8%21
1420
11th to 20thDay
64%13%11%9%4
1204
21st to endDay
67%8%13%7%4
1140
December1st to 10thDay
59%10%12%13%5%1
1025
11th to 20thDay
61%8%13%9%8%2
1201
21st to endDay
53%10%13%11%10%3
1749
January1st to 10thNight
51%10%13%14%11%2
3217
11th to 20thNight
59%9%10%10%9%2
2985
21st to endNight
60%9%12%9%6%3
2970
February1st to 10thNight
55%8%11%12%11%3
2692
11th to 20thNight
66%10%11%9%41
2360
21st to endNight
56%10%12%14%7%
1924
March1st to 10thNight
59%8%10%13%9%1
2241
11th to 20thNight
52%9%11%15%12%1
1980
21st to endNight
61%8%12%10%6%2
2150
April1st to 10thNight
65%8%12%9%41
1638
11th to 20thNight
56%9%14%15%6%
1598
21st to endNight
54%12%14%12%7%1
1393
May1st to 10thNight
61%10%15%12%2
1260
11th to 20thNight
56%9%16%14%4
1146
21st to endNight
52%13%20%12%2
1069
June1st to 10thNight
61%12%16%11%1
900
11th to 20thNight
62%13%13%10%2
900
21st to endNight
67%14%16%4
900
July1st to 10thNight
66%14%13%7%
875
11th to 20thNight
66%13%14%7%
870
21st to endNight
72%12%11%5%
1237
August1st to 10thNight
71%10%13%5%1
1246
11th to 20thNight
76%6%12%6%
1313
21st to endNight
74%9%10%6%1
1782
September1st to 10thNight
73%9%11%7%1
1663
11th to 20thNight
68%11%13%7%1
1876
21st to endNight
64%11%12%10%3
2007
October1st to 10thNight
67%9%11%10%3
2160
11th to 20thNight
63%13%13%10%2
2298
21st to endNight
62%10%14%9%5%1
2772
November1st to 10thNight
66%10%10%11%3
2656
11th to 20thNight
60%13%11%11%5%1
2976
21st to endNight
64%10%12%8%5%
3040
December1st to 10thNight
61%10%13%9%7%1
3154
11th to 20thNight
64%8%13%9%5%1
4007
21st to endNight
52%10%13%12%11%3
5929

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
15%10%17%26%21%10%
280
11th to 20thDay
16%11%19%27%19%8%
263
21st to endDay
13%19%27%29%7%5%
286
February1st to 10thDay
18%11%25%27%11%8%
260
11th to 20thDay
22%18%30%18%10%2
297
21st to endDay
23%18%28%21%8%2
280
March1st to 10thDay
21%16%29%22%12%1
412
11th to 20thDay
9%14%32%29%13%3
520
21st to endDay
19%12%27%26%14%2
572
April1st to 10thDay
19%16%28%21%13%4
520
11th to 20thDay
16%11%25%27%17%4
514
21st to endDay
13%15%28%26%15%5%
600
May1st to 10thDay
20%14%24%23%16%3
603
11th to 20thDay
21%13%23%25%14%4
625
21st to endDay
21%11%24%25%14%5%
774
June1st to 10thDay
22%9%21%23%20%5%
810
11th to 20thDay
21%11%20%26%17%5%
810
21st to endDay
27%8%20%25%15%4
810
July1st to 10thDay
34%11%19%19%13%3
796
11th to 20thDay
32%11%18%21%14%4
792
21st to endDay
36%9%19%18%14%3
715
August1st to 10thDay
39%11%19%18%12%1
626
11th to 20thDay
32%14%24%19%9%3
608
21st to endDay
35%15%19%20%8%3
594
September1st to 10thDay
38%11%22%18%8%3
540
11th to 20thDay
34%14%21%18%10%3
540
21st to endDay
36%11%22%16%10%5%
512
October1st to 10thDay
36%15%24%15%7%2
360
11th to 20thDay
19%13%26%19%19%4
360
21st to endDay
24%16%24%20%14%3
396
November1st to 10thDay
24%15%24%21%12%4
334
11th to 20thDay
20%18%29%14%12%7%
280
21st to endDay
22%18%23%21%12%5%
280
December1st to 10thDay
18%13%28%18%16%6%
280
11th to 20thDay
21%15%25%22%13%4
280
21st to endDay
20%16%22%21%14%6%
308
January1st to 10thNight
14%8%21%33%20%4
940
11th to 20thNight
14%14%24%27%18%3
878
21st to endNight
17%13%26%31%10%3
880
February1st to 10thNight
15%13%24%29%15%4
792
11th to 20thNight
25%15%25%24%9%2
608
21st to endNight
18%17%26%25%12%1
510
March1st to 10thNight
15%15%28%28%13%1
620
11th to 20thNight
11%7%27%33%18%4
620
21st to endNight
17%8%20%34%17%4
668
April1st to 10thNight
19%13%24%24%16%4
540
11th to 20thNight
16%10%21%28%21%4
533
21st to endNight
17%10%24%28%17%5%
493
May1st to 10thNight
21%7%19%23%27%3
360
11th to 20thNight
22%9%19%29%19%3
354
21st to endNight
18%6%22%28%23%3
389
June1st to 10thNight
25%7%18%23%23%4
360
11th to 20thNight
28%415%28%23%3
360
21st to endNight
28%416%18%30%3
360
July1st to 10thNight
31%8%15%21%21%4
350
11th to 20thNight
35%7%16%22%15%5%
348
21st to endNight
40%7%14%19%16%4
394
August1st to 10thNight
39%9%16%19%16%1
358
11th to 20thNight
37%14%16%19%11%3
411
21st to endNight
39%10%15%19%15%2
594
September1st to 10thNight
38%11%16%20%13%2
540
11th to 20thNight
32%14%15%19%17%4
578
21st to endNight
36%10%20%17%15%3
630
October1st to 10thNight
33%16%21%17%12%1
630
11th to 20thNight
25%13%19%23%15%5%
634
21st to endNight
24%15%22%23%13%3
891
November1st to 10thNight
26%12%23%19%16%4
830
11th to 20thNight
18%17%27%23%12%3
850
21st to endNight
20%10%29%24%14%2
850
December1st to 10thNight
19%14%28%23%12%4
904
11th to 20thNight
19%14%26%28%10%3
940
21st to endNight
20%15%23%22%16%4
1034
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