Wapiticrossing Ranch
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wapiticrossing Ranch clear sky chart from 2005-11-06 to 2024-11-12.

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
42%
24082
7%
98536
5%
23908
43%
23908
5%
77423

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
22%
827
2%
4524
2%
810
23%
810
2%
4094
January11th to 20thNight
27%
754
10%
4339
4%
740
29%
740
2%
3539
January21st to endNight
28%
827
2%
4859
3%
814
29%
814
2%
4246
February1st to 10thNight
21%
760
3%
2632
2%
760
23%
760
2%
2471
February11th to 20thNight
26%
744
4%
2300
3%
740
27%
740
4%
2114
February21st to endNight
28%
628
4%
1884
3%
628
30%
628
4%
1711
March1st to 10thNight
34%
754
16%
3524
5%
744
35%
744
4%
2636
March11th to 20thNight
39%
749
6%
3455
5%
740
40%
740
5%
2335
March21st to endNight
33%
826
3%
3649
1%
814
34%
814
3%
3146
April1st to 10thNight
39%
760
4%
1900
2%
760
40%
760
8%
1667
April11th to 20thNight
32%
612
3%
1740
2%
612
32%
612
6%
1535
April21st to endNight
39%
570
4%
1710
4%
570
39%
570
6%
1508
May1st to 10thNight
46%
549
7%
2747
4%
544
48%
544
4%
2200
May11th to 20thNight
54%
368
6%
2439
4%
364
56%
364
3%
1619
May21st to endNight
48%
406
4%
2470
4%
399
50%
399
4%
1850
June1st to 10thNight
50%
380
4%
1330
5%
380
51%
380
8%
1102
June11th to 20thNight
46%
380
3%
1330
1%
380
48%
380
6%
1125
June21st to endNight
66%
380
3%
1330
3%
380
67%
380
9%
1074
July1st to 10thNight
75%
361
13%
1863
8%
360
77%
360
12%
974
July11th to 20thNight
76%
360
12%
2032
14%
359
77%
359
11%
1134
July21st to endNight
81%
408
10%
2328
17%
383
83%
383
10%
1292
August1st to 10thNight
78%
386
21%
2247
14%
383
80%
383
9%
1360
August11th to 20thNight
76%
551
11%
2460
11%
543
78%
543
10%
1623
August21st to endNight
67%
662
15%
2755
9%
654
69%
654
10%
1706
September1st to 10thNight
67%
760
11%
1900
7%
760
68%
760
14%
1561
September11th to 20thNight
64%
760
8%
2080
6%
760
65%
760
11%
1727
September21st to endNight
59%
760
7%
2090
5%
760
61%
760
10%
1759
October1st to 10thNight
52%
748
23%
3184
6%
740
54%
740
7%
2080
October11th to 20thNight
51%
747
8%
3740
8%
740
52%
740
6%
2530
October21st to endNight
37%
826
11%
4329
5%
813
40%
813
4%
3176
November1st to 10thNight
32%
780
3%
2535
3%
780
33%
780
5%
2280
November11th to 20thNight
29%
819
5%
2538
4%
819
30%
819
6%
2244
November21st to endNight
33%
950
4%
2826
3%
950
35%
950
7%
2452
December1st to 10thNight
30%
950
4%
2850
3%
950
31%
950
4%
2583
December11th to 20thNight
23%
950
5%
3459
3%
949
24%
949
3%
3024
December21st to endNight
19%
1030
1%
5158
1%
1026
20%
1026
2%
3946

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
8%14%48%5%4435%6%38%
105341
Night
7%14%5%9%5%5%5%45%6%36%
102448
TransparencyDay
24%46%7%13%8%4
105102
Night
25%46%7%12%7%3
102332
SeeingDay
19%17%27%22%12%4
15076
Night
15%11%22%31%18%2
24259

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
430%15%16%6%5%434410%
2443
11th to 20thDay
8%22%7%15%6%7%4336%19%
2516
21st to endDay
10%27%7%11%5%5%5%45%6%17%
2794
February1st to 10thDay
8%28%10%14%5%4434416%
1547
11th to 20thDay
7%29%7%13%6%44345%16%
1766
21st to endDay
7%28%10%16%7%4333417%
1570
March1st to 10thDay
6%18%6%15%8%5%435%7%22%
3138
11th to 20thDay
5%19%5%7%5%5%333440%
3388
21st to endDay
9%28%7%13%8%6%5%44411%
3965
April1st to 10thDay
11%25%6%11%6%5%5%45%5%17%
2280
11th to 20thDay
11%22%5%10%6%5%5%345%25%
2389
21st to endDay
14%19%39%6%6%6%35%6%24%
2470
May1st to 10thDay
13%19%410%6%5%5%445%27%
4135
11th to 20thDay
8%11%36%5%45%5%7%10%36%
4377
21st to endDay
14%13%39%7%6%7%5%6%7%23%
5089
June1st to 10thDay
19%10%48%6%6%5%45%7%27%
2850
11th to 20thDay
18%10%39%6%5%5%47%5%27%
2850
21st to endDay
8%5%26%45%45%6%7%49%
2850
July1st to 10thDay
221222335%5%72%
4718
11th to 20thDay
2212222235%78%
4420
21st to endDay
2212223247%74%
4790
August1st to 10thDay
331433445%8%62%
4371
11th to 20thDay
442433435%7%60%
4028
21st to endDay
4314345%35%8%60%
4433
September1st to 10thDay
6%5%15%33445%7%58%
2280
11th to 20thDay
9%8%36%5%5%5%36%7%44%
2100
21st to endDay
10%7%37%44445%9%43%
2090
October1st to 10thDay
7%7%26%432347%55%
3490
11th to 20thDay
8%11%37%5%45%447%40%
2892
21st to endDay
12%17%6%11%5%5%5%345%27%
3101
November1st to 10thDay
15%26%5%8%5%4335%6%19%
1764
11th to 20thDay
9%26%8%10%6%4425%5%19%
1643
21st to endDay
6%23%9%11%6%6%5%35%6%20%
1350
December1st to 10thDay
7%22%9%13%6%5%45%5%6%19%
1330
11th to 20thDay
9%23%10%15%8%5%4346%13%
1682
21st to endDay
5%19%9%16%7%5%5%45%7%20%
2442
January1st to 10thNight
428%13%15%7%6%5%35%410%
4532
11th to 20thNight
7%18%8%15%7%5%435%6%21%
4382
21st to endNight
9%27%6%13%7%6%4346%15%
4862
February1st to 10thNight
8%26%8%13%6%44345%19%
2632
11th to 20thNight
7%23%8%13%6%5%4345%22%
2299
21st to endNight
5%20%8%14%9%6%5%44421%
1884
March1st to 10thNight
414%5%12%6%5%5%45%7%32%
3736
11th to 20thNight
5%14%49%6%4434444%
3590
21st to endNight
9%18%6%13%8%7%6%5%5%5%17%
3688
April1st to 10thNight
8%14%5%9%6%5%6%5%7%8%28%
1900
11th to 20thNight
8%15%39%7%7%5%35%6%31%
1740
21st to endNight
8%12%38%5%5%6%5%6%7%35%
1710
May1st to 10thNight
10%17%37%5%5%6%46%7%31%
2831
11th to 20thNight
7%6%36%5%5%5%5%8%8%44%
2516
21st to endNight
16%11%38%5%5%6%5%6%7%28%
2486
June1st to 10thNight
14%10%38%45%447%6%35%
1330
11th to 20thNight
13%8%26%5%4446%7%40%
1330
21st to endNight
6%5%25%445%46%6%54%
1330
July1st to 10thNight
1112112246%79%
2238
11th to 20thNight
211221223480%
2540
21st to endNight
2213222335%75%
2762
August1st to 10thNight
331423335%6%67%
2560
11th to 20thNight
431433446%8%62%
2811
21st to endNight
3313234346%66%
3234
September1st to 10thNight
5%31433435%7%62%
1900
11th to 20thNight
7%6%24445%45%7%51%
2080
21st to endNight
9%7%25%43335%7%51%
2090
October1st to 10thNight
5%7%26%445%46%6%52%
3490
11th to 20thNight
8%9%36%45%5%46%7%44%
4035
21st to endNight
8%14%410%6%5%5%35%6%35%
4457
November1st to 10thNight
12%18%5%10%6%5%4447%23%
2535
11th to 20thNight
9%21%6%11%6%5%435%6%24%
2538
21st to endNight
6%18%7%10%7%7%6%35%6%24%
2826
December1st to 10thNight
6%19%7%13%8%5%5%5%5%7%21%
2850
11th to 20thNight
7%21%8%15%8%6%5%45%6%16%
3510
21st to endNight
418%8%15%7%6%6%46%6%19%
5214

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
53%37%5%41
2443
11th to 20thDay
45%36%6%11%3
2540
21st to endDay
42%39%14%5%1
2794
February1st to 10thDay
29%65%322
1547
11th to 20thDay
26%64%342
1775
21st to endDay
25%64%16%31
1570
March1st to 10thDay
32%43%313%9%
3138
11th to 20thDay
24%39%14%22%1
3389
21st to endDay
46%40%6%5%3
3965
April1st to 10thDay
24%65%6%41
2280
11th to 20thDay
21%65%38%2
2389
21st to endDay
23%64%37%3
2470
May1st to 10thDay
37%41%7%12%3
4135
11th to 20thDay
21%41%12%22%4
4380
21st to endDay
32%41%12%14%1
5090
June1st to 10thDay
14%65%7%12%3
2850
11th to 20thDay
18%65%38%41
2850
21st to endDay
14%63%411%8%1
2850
July1st to 10thDay
8%35%310%28%16%
4644
11th to 20thDay
6%35%26%14%37%
4345
21st to endDay
8%34%314%25%16%
4639
August1st to 10thDay
13%37%318%22%8%
4354
11th to 20thDay
16%37%6%29%11%
4067
21st to endDay
14%37%8%25%15%2
4432
September1st to 10thDay
12%59%5%15%7%2
2280
11th to 20thDay
18%59%6%10%5%1
2100
21st to endDay
19%61%6%10%41
2090
October1st to 10thDay
15%36%9%26%14%
3490
11th to 20thDay
25%36%15%16%7%
2892
21st to endDay
40%36%7%13%31
3101
November1st to 10thDay
31%56%5%7%1
1764
11th to 20thDay
25%59%7%5%3
1643
21st to endDay
23%59%7%7%3
1350
December1st to 10thDay
29%60%5%5%1
1330
11th to 20thDay
37%48%7%7%1
1684
21st to endDay
37%36%14%9%4
2442
January1st to 10thNight
52%36%6%41
4532
11th to 20thNight
41%37%6%12%4
4420
21st to endNight
46%39%10%41
4862
February1st to 10thNight
27%64%342
2632
11th to 20thNight
24%64%46%2
2300
21st to endNight
21%65%27%31
1884
March1st to 10thNight
24%43%5%17%10%
3736
11th to 20thNight
22%40%13%24%2
3590
21st to endNight
41%41%8%8%2
3688
April1st to 10thNight
14%65%9%9%3
1900
11th to 20thNight
17%65%6%9%31
1740
21st to endNight
16%66%410%4
1710
May1st to 10thNight
34%40%8%14%3
2831
11th to 20thNight
21%41%8%20%9%
2516
21st to endNight
30%41%11%14%4
2486
June1st to 10thNight
11%65%5%14%5%
1330
11th to 20thNight
13%65%410%5%2
1330
21st to endNight
10%63%6%12%8%2
1330
July1st to 10thNight
435%315%26%17%
2203
11th to 20thNight
6%34%27%11%40%
2492
21st to endNight
9%34%213%20%21%
2674
August1st to 10thNight
12%36%316%23%11%
2552
11th to 20thNight
14%36%7%29%12%1
2838
21st to endNight
11%36%7%28%14%4
3234
September1st to 10thNight
11%60%5%13%8%3
1900
11th to 20thNight
14%60%6%13%7%1
2080
21st to endNight
15%60%8%11%5%1
2090
October1st to 10thNight
19%36%7%24%14%
3490
11th to 20thNight
21%37%14%15%12%
4035
21st to endNight
31%37%9%17%5%1
4457
November1st to 10thNight
29%56%7%6%1
2535
11th to 20thNight
22%60%7%7%31
2538
21st to endNight
20%60%6%9%5%
2826
December1st to 10thNight
26%60%6%7%2
2850
11th to 20thNight
34%49%8%7%2
3507
21st to endNight
37%36%15%7%4
5214

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
19%21%26%21%11%2
180
11th to 20thDay
24%17%28%13%13%3
180
21st to endDay
24%23%24%21%6%3
198
February1st to 10thDay
28%30%25%12%41
193
11th to 20thDay
26%22%30%16%6%
371
21st to endDay
30%18%30%16%5%1
382
March1st to 10thDay
26%24%25%17%7%1
460
11th to 20thDay
24%18%26%18%12%2
460
21st to endDay
32%22%26%15%41
506
April1st to 10thDay
28%23%27%15%6%1
460
11th to 20thDay
28%23%29%13%5%2
452
21st to endDay
26%22%27%18%5%3
460
May1st to 10thDay
19%20%27%24%9%2
463
11th to 20thDay
25%13%29%19%11%4
488
21st to endDay
22%13%23%21%14%5%
688
June1st to 10thDay
21%13%25%21%15%5%
680
11th to 20thDay
22%19%26%18%12%3
680
21st to endDay
9%12%25%28%21%4
680
July1st to 10thDay
5%11%28%29%21%6%
662
11th to 20thDay
8%13%35%28%11%5%
484
21st to endDay
5%12%36%29%13%5%
531
August1st to 10thDay
8%11%30%30%15%5%
487
11th to 20thDay
6%8%29%32%19%7%
477
21st to endDay
9%15%28%26%16%6%
539
September1st to 10thDay
8%13%32%24%17%6%
490
11th to 20thDay
16%16%28%24%12%5%
490
21st to endDay
18%18%25%22%12%4
490
October1st to 10thDay
18%11%31%26%10%4
490
11th to 20thDay
22%15%22%22%13%5%
305
21st to endDay
29%15%28%18%6%3
330
November1st to 10thDay
31%17%19%25%8%
300
11th to 20thDay
23%21%26%16%12%3
273
21st to endDay
15%21%24%29%10%1
189
December1st to 10thDay
23%21%23%18%12%3
180
11th to 20thDay
23%23%26%20%8%1
180
21st to endDay
22%21%26%21%8%2
198
January1st to 10thNight
20%18%26%25%10%1
834
11th to 20thNight
18%14%29%26%11%2
760
21st to endNight
16%13%30%29%10%1
836
February1st to 10thNight
20%18%29%22%9%1
760
11th to 20thNight
21%15%27%27%9%1
744
21st to endNight
20%15%26%25%13%2
628
March1st to 10thNight
15%13%27%29%14%1
760
11th to 20thNight
16%15%21%31%16%1
760
21st to endNight
18%12%26%32%11%1
836
April1st to 10thNight
17%13%22%30%15%2
760
11th to 20thNight
16%15%28%27%13%1
612
21st to endNight
15%14%26%30%15%2
570
May1st to 10thNight
15%8%23%33%19%2
554
11th to 20thNight
13%5%20%30%27%5%
374
21st to endNight
19%9%13%27%28%4
411
June1st to 10thNight
17%7%17%30%24%5%
380
11th to 20thNight
19%9%19%34%17%3
380
21st to endNight
8%5%13%40%33%2
380
July1st to 10thNight
1315%40%40%2
370
11th to 20thNight
4413%49%28%2
368
21st to endNight
3211%45%38%2
416
August1st to 10thNight
4410%38%40%4
396
11th to 20thNight
4212%39%35%7%
564
21st to endNight
6%417%38%32%3
676
September1st to 10thNight
6%316%37%31%7%
760
11th to 20thNight
11%5%14%33%31%7%
760
21st to endNight
14%7%15%37%23%5%
760
October1st to 10thNight
12%8%18%40%21%1
760
11th to 20thNight
18%7%16%33%22%4
760
21st to endNight
20%14%20%28%14%3
836
November1st to 10thNight
23%12%25%28%12%
780
11th to 20thNight
22%17%26%24%11%1
819
21st to endNight
15%16%27%27%14%1
950
December1st to 10thNight
17%17%25%29%11%1
950
11th to 20thNight
19%15%31%26%8%
950
21st to endNight
20%18%30%23%8%
1045
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