North Battleford
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the North Battleford clear sky chart from 2005-11-06 to 2024-04-10.

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 Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(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

By Month

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 Forecast	Data Points
Cloud Cover	Day	9% 8% 4 8% 7% 4 5% 6% 6% 8% 34%	82304
	Night	7% 9% 4 9% 8% 4 6% 6% 6% 8% 33%	86445
Transparency	Day	46% 7% 16% 22% 8% 1	82005
	Night	47% 7% 15% 22% 9% 1	86324
Seeing	Day	13% 8% 25% 31% 18% 5%	14809
	Night	12% 6% 27% 37% 16% 2	24252

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	6% 14% 6% 14% 11% 6% 6% 5% 4 5% 23%	2219
	11th to 20th	Day	5% 7% 4 10% 10% 7% 11% 8% 11% 10% 17%	2199
	21st to end	Day	6% 11% 5% 14% 9% 3 5% 5% 6% 7% 28%	2442
February	1st to 10th	Day	8% 12% 7% 10% 9% 5% 8% 6% 6% 7% 21%	1630
	11th to 20th	Day	7% 12% 6% 10% 10% 5% 6% 5% 6% 7% 26%	1665
	21st to end	Day	5% 10% 5% 12% 10% 5% 7% 7% 7% 7% 24%	1413
March	1st to 10th	Day	5% 11% 4 9% 8% 6% 6% 8% 6% 8% 27%	3164
	11th to 20th	Day	5% 10% 5% 10% 7% 4 5% 5% 6% 9% 34%	3489
	21st to end	Day	6% 9% 5% 11% 9% 5% 5% 5% 5% 8% 31%	3938
April	1st to 10th	Day	8% 10% 4 8% 8% 4 6% 6% 6% 8% 35%	2269
	11th to 20th	Day	10% 10% 4 9% 8% 4 6% 6% 7% 8% 29%	2300
	21st to end	Day	13% 9% 4 7% 6% 4 6% 5% 6% 8% 33%	2466
May	1st to 10th	Day	11% 7% 4 7% 8% 4 5% 6% 6% 8% 34%	2520
	11th to 20th	Day	8% 6% 3 7% 6% 3 7% 5% 6% 8% 40%	2551
	21st to end	Day	15% 6% 4 7% 6% 3 5% 6% 6% 7% 35%	2917
June	1st to 10th	Day	14% 7% 3 7% 7% 4 5% 6% 6% 8% 33%	2875
	11th to 20th	Day	21% 9% 4 7% 6% 3 5% 5% 6% 7% 27%	2880
	21st to end	Day	11% 6% 4 6% 5% 4 6% 5% 6% 9% 38%	2880
July	1st to 10th	Day	9% 4 3 5% 6% 3 5% 5% 8% 9% 44%	2749
	11th to 20th	Day	10% 4 2 5% 6% 4 6% 6% 7% 11% 40%	2700
	21st to end	Day	8% 3 2 4 4 4 5% 6% 6% 10% 48%	2938
August	1st to 10th	Day	9% 5% 2 6% 6% 3 5% 6% 7% 9% 42%	2546
	11th to 20th	Day	9% 5% 2 5% 6% 3 5% 5% 7% 9% 44%	2384
	21st to end	Day	12% 6% 2 4 4 3 4 5% 6% 9% 45%	2574
September	1st to 10th	Day	12% 5% 2 4 5% 4 5% 5% 6% 9% 44%	2165
	11th to 20th	Day	14% 8% 2 6% 5% 3 4 4 5% 6% 41%	2154
	21st to end	Day	9% 6% 2 5% 5% 3 5% 6% 6% 8% 47%	1900
October	1st to 10th	Day	14% 11% 4 6% 5% 3 4 4 6% 6% 38%	1800
	11th to 20th	Day	10% 8% 3 7% 5% 4 4 5% 5% 7% 42%	1800
	21st to end	Day	10% 11% 5% 10% 7% 4 5% 6% 5% 7% 31%	1660
November	1st to 10th	Day	13% 16% 5% 10% 7% 4 4 5% 5% 4 27%	1488
	11th to 20th	Day	9% 15% 7% 12% 9% 4 5% 4 5% 6% 25%	1520
	21st to end	Day	7% 11% 6% 12% 9% 5% 7% 6% 5% 8% 24%	1362
December	1st to 10th	Day	7% 12% 6% 13% 9% 5% 5% 6% 6% 6% 25%	1140
	11th to 20th	Day	7% 10% 6% 15% 7% 4 8% 6% 4 7% 25%	1439
	21st to end	Day	3 8% 5% 8% 7% 4 5% 6% 7% 7% 41%	2168
January	1st to 10th	Night	6% 11% 6% 13% 11% 6% 7% 7% 6% 8% 19%	4726
	11th to 20th	Night	3 8% 4 12% 11% 8% 12% 8% 8% 8% 18%	4699
	21st to end	Night	6% 13% 5% 11% 10% 4 5% 4 6% 8% 28%	5214
February	1st to 10th	Night	6% 11% 6% 11% 10% 5% 6% 6% 7% 9% 23%	2565
	11th to 20th	Night	5% 10% 4 10% 9% 4 7% 6% 7% 7% 29%	2402
	21st to end	Night	4 8% 4 10% 10% 4 7% 6% 7% 8% 32%	2041
March	1st to 10th	Night	6% 11% 4 10% 10% 5% 6% 7% 8% 9% 23%	3701
	11th to 20th	Night	6% 10% 4 9% 7% 4 6% 7% 8% 10% 29%	3490
	21st to end	Night	7% 7% 4 8% 7% 4 6% 7% 7% 10% 31%	3711
April	1st to 10th	Night	6% 8% 4 7% 7% 3 6% 5% 7% 8% 40%	1900
	11th to 20th	Night	9% 10% 3 8% 6% 4 7% 5% 7% 8% 33%	1611
	21st to end	Night	13% 8% 4 7% 6% 4 5% 5% 5% 6% 35%	1494
May	1st to 10th	Night	11% 7% 2 5% 5% 3 5% 7% 7% 10% 39%	1440
	11th to 20th	Night	9% 4 2 4 5% 3 5% 5% 8% 8% 46%	1341
	21st to end	Night	16% 6% 3 5% 6% 4 5% 6% 5% 7% 37%	1358
June	1st to 10th	Night	11% 7% 4 7% 6% 3 6% 7% 7% 9% 34%	1080
	11th to 20th	Night	19% 8% 3 6% 5% 3 6% 6% 6% 7% 30%	1080
	21st to end	Night	9% 3 2 5% 5% 4 5% 6% 6% 10% 43%	1080
July	1st to 10th	Night	6% 2 2 6% 5% 4 5% 5% 7% 9% 48%	1208
	11th to 20th	Night	9% 4 2 5% 6% 3 5% 6% 7% 10% 45%	1260
	21st to end	Night	6% 3 1 3 4 2 4 6% 6% 10% 55%	1379
August	1st to 10th	Night	6% 3 2 4 5% 4 4 5% 7% 9% 51%	1392
	11th to 20th	Night	8% 4 2 4 4 2 5% 5% 8% 10% 47%	1514
	21st to end	Night	8% 5% 2 4 5% 3 4 6% 6% 8% 50%	1782
September	1st to 10th	Night	9% 6% 3 4 5% 2 5% 5% 6% 7% 47%	1795
	11th to 20th	Night	11% 6% 3 4 5% 3 3 6% 5% 8% 46%	1804
	21st to end	Night	7% 6% 3 5% 4 3 4 5% 6% 8% 50%	2060
October	1st to 10th	Night	12% 9% 2 6% 5% 3 5% 5% 5% 7% 40%	2160
	11th to 20th	Night	8% 8% 3 7% 5% 3 3 5% 4 8% 45%	2160
	21st to end	Night	9% 12% 6% 9% 5% 4 4 4 5% 6% 36%	2674
November	1st to 10th	Night	16% 13% 5% 7% 8% 4 4 5% 5% 6% 26%	2590
	11th to 20th	Night	9% 11% 5% 14% 9% 4 6% 4 5% 6% 26%	2660
	21st to end	Night	6% 11% 7% 12% 9% 4 6% 4 5% 8% 28%	2811
December	1st to 10th	Night	7% 10% 6% 10% 10% 6% 7% 6% 6% 8% 25%	3040
	11th to 20th	Night	7% 13% 6% 14% 10% 5% 7% 5% 5% 7% 20%	3753
	21st to end	Night	3 6% 3 8% 7% 4 6% 6% 5% 7% 46%	5470

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	64% 6% 9% 15% 5%	2219
	11th to 20th	Day	57% 10% 11% 16% 5% 1	2220
	21st to end	Day	55% 7% 14% 19% 6%	2442
February	1st to 10th	Day	60% 5% 12% 15% 7%	1630
	11th to 20th	Day	57% 6% 13% 16% 8% 1	1674
	21st to end	Day	56% 8% 12% 17% 8%	1413
March	1st to 10th	Day	51% 7% 19% 16% 6%	3164
	11th to 20th	Day	46% 10% 20% 18% 5%	3490
	21st to end	Day	50% 6% 12% 19% 13%	3938
April	1st to 10th	Day	46% 8% 15% 21% 10%	2269
	11th to 20th	Day	51% 6% 13% 19% 10% 1	2300
	21st to end	Day	47% 7% 13% 22% 9% 1	2466
May	1st to 10th	Day	46% 6% 12% 24% 11% 1	2520
	11th to 20th	Day	40% 7% 13% 27% 12% 1	2555
	21st to end	Day	47% 7% 13% 22% 11% 1	2918
June	1st to 10th	Day	47% 8% 15% 20% 9% 1	2875
	11th to 20th	Day	54% 7% 13% 18% 7% 1	2880
	21st to end	Day	42% 9% 19% 24% 6%	2880
July	1st to 10th	Day	34% 8% 23% 27% 8%	2675
	11th to 20th	Day	37% 10% 23% 26% 4	2619
	21st to end	Day	30% 10% 23% 31% 6%	2775
August	1st to 10th	Day	37% 9% 23% 25% 6%	2528
	11th to 20th	Day	35% 8% 24% 27% 6%	2384
	21st to end	Day	35% 6% 21% 32% 6% 1	2574
September	1st to 10th	Day	36% 7% 19% 25% 10% 3	2165
	11th to 20th	Day	43% 5% 18% 27% 7%	2154
	21st to end	Day	33% 7% 20% 27% 11% 1	1900
October	1st to 10th	Day	46% 7% 16% 25% 7%	1800
	11th to 20th	Day	42% 6% 16% 29% 8%	1800
	21st to end	Day	52% 7% 15% 20% 6%	1660
November	1st to 10th	Day	59% 6% 13% 15% 6%	1488
	11th to 20th	Day	61% 7% 14% 15% 4	1520
	21st to end	Day	57% 7% 17% 16% 3	1362
December	1st to 10th	Day	58% 7% 12% 16% 6% 1	1140
	11th to 20th	Day	58% 7% 16% 14% 5%	1440
	21st to end	Day	41% 6% 14% 21% 17% 2	2168
January	1st to 10th	Night	59% 9% 14% 14% 4	4726
	11th to 20th	Night	60% 6% 13% 15% 6%	4740
	21st to end	Night	54% 7% 15% 19% 5%	5214
February	1st to 10th	Night	56% 6% 13% 18% 7%	2565
	11th to 20th	Night	51% 6% 14% 18% 10%	2403
	21st to end	Night	47% 6% 13% 24% 10%	2041
March	1st to 10th	Night	53% 7% 16% 19% 6%	3701
	11th to 20th	Night	46% 9% 17% 21% 7%	3490
	21st to end	Night	44% 7% 13% 23% 12%	3711
April	1st to 10th	Night	41% 7% 13% 23% 16%	1900
	11th to 20th	Night	47% 5% 12% 22% 11% 2	1611
	21st to end	Night	49% 6% 11% 21% 11% 2	1494
May	1st to 10th	Night	37% 6% 13% 27% 17% 1	1440
	11th to 20th	Night	32% 8% 11% 30% 16% 3	1341
	21st to end	Night	44% 7% 13% 23% 11% 1	1358
June	1st to 10th	Night	44% 8% 15% 23% 9% 1	1080
	11th to 20th	Night	51% 7% 14% 18% 9% 1	1080
	21st to end	Night	35% 8% 23% 25% 9% 1	1080
July	1st to 10th	Night	30% 9% 23% 31% 6% 1	1173
	11th to 20th	Night	34% 8% 22% 29% 6%	1218
	21st to end	Night	24% 7% 26% 34% 7% 1	1302
August	1st to 10th	Night	29% 9% 23% 31% 8% 1	1385
	11th to 20th	Night	29% 9% 24% 28% 8% 1	1514
	21st to end	Night	31% 6% 16% 36% 11% 1	1782
September	1st to 10th	Night	34% 6% 17% 27% 11% 5%	1795
	11th to 20th	Night	36% 7% 15% 31% 11% 1	1804
	21st to end	Night	31% 7% 17% 30% 13% 2	2060
October	1st to 10th	Night	44% 7% 14% 26% 9% 1	2160
	11th to 20th	Night	38% 6% 15% 29% 12%	2160
	21st to end	Night	49% 6% 13% 23% 8% 1	2674
November	1st to 10th	Night	58% 7% 12% 16% 6% 1	2590
	11th to 20th	Night	60% 7% 14% 15% 4	2660
	21st to end	Night	55% 7% 18% 16% 4	2811
December	1st to 10th	Night	56% 6% 15% 16% 5% 1	3040
	11th to 20th	Night	63% 7% 14% 12% 4	3751
	21st to end	Night	37% 6% 13% 26% 16% 2	5470

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	16% 5% 24% 33% 14% 7%	180
	11th to 20th	Day	13% 7% 22% 31% 22% 6%	180
	21st to end	Day	12% 8% 23% 32% 18% 6%	198
February	1st to 10th	Day	11% 6% 33% 34% 14% 2	265
	11th to 20th	Day	13% 4 25% 32% 22% 4	270
	21st to end	Day	4 6% 27% 32% 27% 5%	225
March	1st to 10th	Day	8% 11% 27% 33% 18% 3	312
	11th to 20th	Day	10% 8% 32% 31% 12% 6%	460
	21st to end	Day	13% 6% 26% 33% 19% 2	506
April	1st to 10th	Day	9% 12% 33% 30% 11% 4	457
	11th to 20th	Day	13% 12% 28% 31% 13% 4	412
	21st to end	Day	16% 9% 33% 28% 13% 2	546
May	1st to 10th	Day	12% 9% 28% 29% 16% 6%	603
	11th to 20th	Day	9% 9% 22% 33% 20% 6%	625
	21st to end	Day	14% 8% 23% 29% 17% 9%	679
June	1st to 10th	Day	13% 8% 27% 33% 15% 4	630
	11th to 20th	Day	23% 12% 21% 24% 16% 4	630
	21st to end	Day	12% 7% 17% 32% 25% 7%	630
July	1st to 10th	Day	11% 5% 18% 38% 22% 6%	621
	11th to 20th	Day	12% 7% 22% 32% 19% 8%	618
	21st to end	Day	9% 4 22% 30% 28% 7%	684
August	1st to 10th	Day	11% 6% 18% 28% 27% 9%	626
	11th to 20th	Day	10% 7% 21% 31% 25% 7%	522
	21st to end	Day	13% 5% 23% 29% 23% 7%	495
September	1st to 10th	Day	14% 9% 29% 28% 16% 4	450
	11th to 20th	Day	21% 6% 24% 32% 15% 2	450
	21st to end	Day	13% 12% 25% 27% 20% 3	370
October	1st to 10th	Day	18% 4 25% 33% 14% 6%	270
	11th to 20th	Day	14% 7% 29% 34% 11% 4	270
	21st to end	Day	14% 10% 29% 29% 14% 3	297
November	1st to 10th	Day	20% 6% 26% 31% 15% 1	270
	11th to 20th	Day	16% 9% 31% 32% 10% 1	270
	21st to end	Day	7% 10% 33% 31% 15% 3	230
December	1st to 10th	Day	11% 5% 18% 38% 22% 6%	180
	11th to 20th	Day	8% 9% 33% 34% 14% 2	180
	21st to end	Day	12% 2 26% 30% 23% 8%	198
January	1st to 10th	Night	10% 9% 29% 35% 15% 2	950
	11th to 20th	Night	11% 7% 32% 37% 11% 2	950
	21st to end	Night	13% 8% 32% 35% 10% 1	1045
February	1st to 10th	Night	10% 7% 27% 36% 18% 2	846
	11th to 20th	Night	11% 5% 29% 37% 15% 3	744
	21st to end	Night	6% 4 20% 40% 27% 3	628
March	1st to 10th	Night	11% 4 31% 40% 13% 2	760
	11th to 20th	Night	10% 6% 33% 37% 13% 1	760
	21st to end	Night	12% 5% 26% 38% 16% 2	770
April	1st to 10th	Night	9% 7% 28% 39% 15% 2	570
	11th to 20th	Night	14% 8% 32% 30% 16% 1	533
	21st to end	Night	20% 6% 25% 35% 13% 1	540
May	1st to 10th	Night	14% 6% 24% 37% 16% 3	540
	11th to 20th	Night	11% 6% 25% 37% 19% 2	456
	21st to end	Night	17% 3 21% 39% 19% 2	389
June	1st to 10th	Night	15% 8% 24% 36% 17% 1	360
	11th to 20th	Night	24% 4 21% 27% 21% 3	360
	21st to end	Night	12% 3 19% 40% 24% 2	360
July	1st to 10th	Night	7% 4 19% 47% 21% 2	350
	11th to 20th	Night	11% 3 23% 43% 19% 1	348
	21st to end	Night	6% 3 25% 38% 24% 4	394
August	1st to 10th	Night	8% 3 21% 36% 29% 3	497
	11th to 20th	Night	9% 3 19% 42% 26% 2	534
	21st to end	Night	10% 4 24% 39% 22% 2	594
September	1st to 10th	Night	12% 5% 24% 41% 16% 2	540
	11th to 20th	Night	14% 4 22% 42% 17% 1	544
	21st to end	Night	10% 6% 29% 38% 15% 1	720
October	1st to 10th	Night	18% 5% 27% 36% 13% 1	720
	11th to 20th	Night	14% 5% 27% 38% 13% 2	720
	21st to end	Night	16% 8% 32% 34% 9% 1	960
November	1st to 10th	Night	22% 6% 26% 34% 10% 1	925
	11th to 20th	Night	15% 7% 30% 33% 12% 2	950
	21st to end	Night	10% 9% 32% 37% 10% 1	950
December	1st to 10th	Night	11% 7% 28% 35% 16% 4	950
	11th to 20th	Night	12% 8% 30% 36% 13% 1	950
	21st to end	Night	9% 5% 27% 39% 17% 3	1045

Page generated at 2024-04-07 07:28:16. Version ac07

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