North Battleford
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the North Battleford clear sky chart from 2005-11-05 to

2017-09-12
.

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
41%
15440
11%
46672
7%
15414
45%
15414
20%
32864

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 15thNight
31%
895
8%
2685
4%
895
34%
895
13%
2049
January16th to endNight
27%
960
12%
2880
5%
960
34%
960
15%
2168
February1st to 15thNight
39%
752
9%
2340
8%
750
42%
750
16%
1735
February16th to endNight
45%
632
12%
2052
10%
632
49%
632
17%
1493
March1st to 15thNight
36%
720
13%
2097
8%
720
40%
720
19%
1526
March16th to endNight
37%
725
12%
2070
8%
725
40%
725
17%
1557
April1st to 15thNight
42%
539
14%
1745
11%
539
47%
539
22%
1146
April16th to endNight
40%
540
14%
1536
10%
540
44%
540
22%
1070
May1st to 15thNight
48%
539
10%
1440
6%
539
50%
539
30%
947
May16th to endNight
50%
381
3%
1316
3%
381
51%
381
21%
864
June1st to 15thNight
43%
360
0%
1080
0%
360
43%
360
18%
767
June16th to endNight
53%
360
0%
1080
0%
360
53%
360
23%
741
July1st to 15thNight
61%
340
0%
1155
0%
340
61%
340
29%
669
July16th to endNight
58%
376
6%
1239
6%
354
58%
354
31%
693
August1st to 15thNight
69%
512
11%
1406
8%
510
71%
510
36%
847
August16th to endNight
58%
573
18%
1719
14%
573
63%
573
37%
982
September1st to 15thNight
54%
530
15%
1763
14%
530
57%
530
30%
1021
September16th to endNight
52%
604
21%
1812
15%
604
60%
604
35%
1027
October1st to 15thNight
42%
660
18%
1980
11%
660
48%
660
23%
1349
October16th to endNight
37%
807
16%
2295
9%
807
43%
807
22%
1594
November1st to 15thNight
35%
875
14%
2450
9%
875
38%
875
17%
1850
November16th to endNight
30%
900
9%
2616
4%
900
34%
900
14%
2017
December1st to 15thNight
31%
900
5%
2880
3%
900
34%
900
10%
2338
December16th to endNight
32%
960
10%
3036
6%
960
37%
960
11%
2414

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%9%47%6%35%5%5%7%32%
48009
Night
9%9%48%7%35%5%5%7%32%
46826
TransparencyDay
49%7%17%20%5%
47659
Night
48%6%15%20%6%
46680
SeeingDay
15%6%24%29%18%5%
6155
Night
13%5%25%36%16%2
15454

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 15thDay
10%13%7%10%8%45%6%5%5%22%
1253
16th to endDay
7%11%5%12%8%46%46%7%24%
1344
February1st to 15thDay
8%12%6%8%9%6%7%6%5%6%21%
1524
16th to endDay
8%14%7%12%10%45%5%46%19%
1422
March1st to 15thDay
8%14%49%7%5%6%6%5%7%23%
1862
16th to endDay
10%13%6%10%8%35%45%6%24%
2153
April1st to 15thDay
10%11%48%7%35%5%5%7%28%
2203
16th to endDay
15%9%47%6%35%45%7%29%
2424
May1st to 15thDay
10%6%36%7%25%5%6%8%36%
2511
16th to endDay
15%6%36%6%35%5%6%7%31%
2794
June1st to 15thDay
17%7%37%6%35%5%6%7%29%
2877
16th to endDay
17%7%36%6%35%5%6%8%30%
2880
July1st to 15thDay
10%4246%345%7%9%42%
2732
16th to endDay
9%325%436%6%6%10%43%
2846
August1st to 15thDay
11%5%26%6%345%6%8%40%
2542
16th to endDay
9%5%144245%6%9%44%
2483
September1st to 15thDay
13%5%2442445%6%46%
2116
16th to endDay
10%5%25%4245%6%7%45%
1816
October1st to 15thDay
16%11%36%5%3335%5%34%
1650
16th to endDay
11%9%36%6%345%6%8%33%
1563
November1st to 15thDay
12%14%47%4345%5%6%31%
1408
16th to endDay
9%13%6%11%9%46%5%5%7%22%
1341
December1st to 15thDay
10%12%8%14%8%5%5%6%47%15%
1080
16th to endDay
415%7%13%8%38%7%7%6%17%
1185
January1st to 15thNight
7%12%5%11%9%5%5%6%5%7%21%
2685
16th to endNight
6%11%5%10%8%46%5%6%7%27%
2880
February1st to 15thNight
5%10%6%11%8%37%6%6%7%24%
2337
16th to endNight
6%11%5%11%9%46%5%5%6%27%
2052
March1st to 15thNight
8%10%49%7%45%5%6%7%28%
2097
16th to endNight
9%11%5%9%7%46%6%47%27%
2067
April1st to 15thNight
7%9%36%5%36%46%8%36%
1745
16th to endNight
14%9%46%5%3445%6%35%
1536
May1st to 15thNight
12%5%24435%5%7%9%39%
1439
16th to endNight
16%5%35%5%35%5%45%38%
1316
June1st to 15thNight
14%9%46%5%25%6%7%7%28%
1080
16th to endNight
13%435%5%46%6%5%9%36%
1080
July1st to 15thNight
5%225%6%35%5%7%10%44%
1225
16th to endNight
7%3125%245%5%9%50%
1323
August1st to 15thNight
7%3135%245%8%10%48%
1413
16th to endNight
6%4144245%6%8%50%
1719
September1st to 15thNight
11%6%2442345%7%47%
1763
16th to endNight
8%4232235%5%8%52%
1812
October1st to 15thNight
13%9%26%424447%38%
1980
16th to endNight
11%10%47%5%23347%37%
2295
November1st to 15thNight
15%11%5%7%7%35%445%30%
2450
16th to endNight
7%12%7%12%7%46%447%26%
2616
December1st to 15thNight
11%12%6%11%10%5%6%5%5%6%17%
2880
16th to endNight
5%10%6%13%11%47%6%6%7%19%
3036

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 15thDay
61%6%13%13%4
1253
16th to endDay
57%6%13%16%6%1
1344
February1st to 15thDay
61%6%14%12%4
1524
16th to endDay
63%6%10%11%7%
1422
March1st to 15thDay
59%7%16%13%3
1862
16th to endDay
59%6%13%16%3
2154
April1st to 15thDay
53%7%13%16%7%1
2203
16th to endDay
53%5%13%19%7%
2424
May1st to 15thDay
44%5%12%26%9%1
2511
16th to endDay
49%6%13%19%10%
2799
June1st to 15thDay
52%7%13%19%6%
2877
16th to endDay
50%9%16%19%4
2880
July1st to 15thDay
36%8%23%25%6%
2573
16th to endDay
35%10%25%26%3
2667
August1st to 15thDay
40%7%25%21%4
2524
16th to endDay
34%6%24%29%4
2483
September1st to 15thDay
36%5%19%25%9%2
2116
16th to endDay
35%6%22%27%7%
1816
October1st to 15thDay
49%6%14%24%3
1650
16th to endDay
47%7%18%22%3
1563
November1st to 15thDay
52%6%17%17%6%
1408
16th to endDay
60%8%15%13%1
1341
December1st to 15thDay
66%7%11%11%2
1080
16th to endDay
63%8%13%11%3
1185
January1st to 15thNight
58%5%17%14%3
2685
16th to endNight
55%7%13%16%7%
2880
February1st to 15thNight
54%6%15%17%5%
2348
16th to endNight
54%5%13%19%7%
2052
March1st to 15thNight
51%6%16%19%6%
2097
16th to endNight
55%6%13%18%6%
2070
April1st to 15thNight
44%5%14%21%12%
1745
16th to endNight
49%411%21%11%2
1536
May1st to 15thNight
38%6%11%27%14%1
1440
16th to endNight
44%6%12%21%11%2
1316
June1st to 15thNight
50%6%15%20%5%
1080
16th to endNight
44%8%20%20%6%
1080
July1st to 15thNight
31%8%24%28%6%
1155
16th to endNight
30%7%26%29%5%
1239
August1st to 15thNight
27%10%25%29%5%
1406
16th to endNight
29%5%19%34%9%
1719
September1st to 15thNight
35%415%29%11%3
1763
16th to endNight
28%7%16%33%11%2
1812
October1st to 15thNight
45%6%13%24%9%
1980
16th to endNight
47%5%17%23%5%
2295
November1st to 15thNight
55%6%12%19%5%1
2450
16th to endNight
58%6%17%13%3
2616
December1st to 15thNight
65%7%14%10%1
2880
16th to endNight
61%8%12%13%3
3036

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 15thDay
15%5%21%26%21%10%
60
16th to endDay
17%318%35%17%7%
64
February1st to 15thDay
17%228%30%20%1
89
16th to endDay
22%324%25%19%3
81
March1st to 15thDay
16%9%38%24%9%2
176
16th to endDay
18%8%34%24%12%2
288
April1st to 15thDay
14%13%37%23%9%2
269
16th to endDay
22%7%25%26%16%2
354
May1st to 15thDay
12%8%25%32%16%4
468
16th to endDay
14%8%23%26%17%9%
517
June1st to 15thDay
16%7%28%26%16%4
495
16th to endDay
18%7%19%27%22%5%
495
July1st to 15thDay
13%418%35%21%6%
475
16th to endDay
11%423%30%23%6%
515
August1st to 15thDay
15%415%26%27%11%
490
16th to endDay
7%5%28%30%23%4
332
September1st to 15thDay
16%6%23%32%18%3
300
16th to endDay
13%7%25%33%17%2
206
October1st to 15thDay
31%6%20%26%13%2
90
16th to endDay
16%8%30%26%17%1
96
November1st to 15thDay
18%124%40%15%
90
16th to endDay
14%8%24%28%16%7%
81
December1st to 15thDay
6%5%18%43%16%10%
60
16th to endDay
14%31%31%12%10%
64
January1st to 15thNight
13%6%28%36%13%1
900
16th to endNight
13%7%35%34%8%1
960
February1st to 15thNight
11%5%22%39%18%3
758
16th to endNight
10%322%37%22%3
632
March1st to 15thNight
11%432%37%11%2
720
16th to endNight
14%429%34%15%1
726
April1st to 15thNight
12%6%29%35%14%1
539
16th to endNight
22%425%29%17%
540
May1st to 15thNight
15%5%24%36%15%2
540
16th to endNight
17%320%38%16%3
382
June1st to 15thNight
19%422%30%21%1
360
16th to endNight
17%318%34%24%1
360
July1st to 15thNight
6%318%46%22%1
340
16th to endNight
7%224%40%22%2
376
August1st to 15thNight
8%116%34%34%3
512
16th to endNight
8%224%40%23%1
573
September1st to 15thNight
14%319%40%19%2
530
16th to endNight
10%426%38%18%
604
October1st to 15thNight
19%424%34%14%2
660
16th to endNight
17%6%27%35%11%1
807
November1st to 15thNight
20%6%26%32%12%1
875
16th to endNight
13%9%28%35%11%1
900
December1st to 15thNight
15%6%25%33%15%3
900
16th to endNight
10%426%36%18%3
960
Page generated at 2017-09-13 05:39:11. Version ac04

Copyright 2017 A. Danko


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