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 2025-10-19.

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% 3 9% 6% 5% 5% 4 6% 8% 36%	130338
	Night	7% 9% 4 10% 6% 6% 6% 4 6% 8% 34%	128010
Transparency	Day	45% 6% 16% 24% 8% 1	130036
	Night	47% 6% 15% 22% 8% 1	127892
Seeing	Day	13% 8% 25% 31% 18% 5%	17009
	Night	12% 6% 27% 37% 15% 2	26085

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	5% 13% 5% 16% 9% 8% 6% 4 5% 6% 23%	3179
	11th to 20th	Day	4 7% 4 12% 7% 8% 9% 5% 10% 12% 22%	3159
	21st to end	Day	7% 13% 5% 15% 7% 5% 4 4 6% 7% 27%	3498
February	1st to 10th	Day	7% 14% 6% 12% 8% 8% 7% 5% 6% 7% 21%	1717
	11th to 20th	Day	6% 13% 5% 11% 9% 7% 6% 4 7% 7% 26%	1755
	21st to end	Day	5% 11% 5% 14% 9% 7% 6% 5% 7% 7% 24%	1485
March	1st to 10th	Day	4 10% 4 12% 8% 7% 6% 6% 7% 10% 25%	4536
	11th to 20th	Day	5% 11% 5% 16% 8% 5% 5% 4 6% 8% 28%	4999
	21st to end	Day	9% 13% 5% 13% 7% 6% 5% 3 5% 7% 28%	5651
April	1st to 10th	Day	7% 11% 3 9% 6% 5% 6% 4 6% 8% 35%	2400
	11th to 20th	Day	10% 11% 4 10% 6% 5% 5% 4 7% 8% 30%	2560
	21st to end	Day	12% 9% 4 8% 5% 5% 5% 4 6% 8% 33%	2740
May	1st to 10th	Day	11% 9% 3 6% 5% 4 5% 4 5% 7% 41%	6340
	11th to 20th	Day	14% 9% 3 9% 6% 6% 6% 4 7% 7% 29%	6488
	21st to end	Day	11% 8% 3 7% 5% 5% 5% 4 6% 8% 39%	7405
June	1st to 10th	Day	13% 8% 3 7% 6% 5% 5% 5% 7% 8% 34%	3195
	11th to 20th	Day	20% 9% 3 8% 6% 5% 5% 4 7% 7% 27%	3200
	21st to end	Day	12% 7% 3 7% 5% 6% 5% 5% 7% 8% 37%	3200
July	1st to 10th	Day	7% 4 2 5% 3 4 4 4 8% 9% 50%	6885
	11th to 20th	Day	10% 5% 2 7% 5% 5% 5% 5% 7% 9% 40%	6780
	21st to end	Day	6% 4 2 5% 4 4 5% 5% 7% 10% 49%	7376
August	1st to 10th	Day	12% 5% 2 5% 4 4 4 4 5% 8% 47%	4618
	11th to 20th	Day	7% 5% 2 6% 4 5% 5% 4 7% 10% 44%	4301
	21st to end	Day	10% 6% 2 5% 4 4 4 4 6% 9% 47%	4664
September	1st to 10th	Day	10% 5% 2 5% 4 4 5% 4 6% 9% 45%	2405
	11th to 20th	Day	14% 9% 2 7% 4 4 4 3 5% 6% 41%	2392
	21st to end	Day	8% 6% 2 5% 4 4 5% 5% 5% 8% 49%	2110
October	1st to 10th	Day	8% 10% 3 6% 4 4 4 4 6% 8% 44%	3270
	11th to 20th	Day	6% 7% 3 7% 5% 5% 4 3 7% 11% 41%	3230
	21st to end	Day	7% 8% 4 9% 5% 5% 6% 5% 6% 7% 37%	2868
November	1st to 10th	Day	12% 16% 5% 11% 6% 5% 4 4 5% 4 28%	1568
	11th to 20th	Day	9% 16% 7% 15% 6% 4 5% 3 5% 6% 24%	1600
	21st to end	Day	6% 13% 5% 14% 7% 7% 6% 5% 6% 8% 24%	1433
December	1st to 10th	Day	7% 14% 4 12% 7% 7% 6% 6% 6% 7% 23%	1960
	11th to 20th	Day	6% 12% 6% 16% 9% 10% 8% 5% 4 5% 18%	2259
	21st to end	Day	3 7% 4 12% 10% 6% 5% 4 6% 6% 35%	3112
January	1st to 10th	Night	4 10% 5% 15% 10% 10% 7% 5% 8% 7% 19%	6766
	11th to 20th	Night	4 9% 4 13% 9% 9% 10% 5% 8% 9% 21%	6739
	21st to end	Night	5% 11% 4 13% 8% 6% 5% 3 6% 8% 29%	7458
February	1st to 10th	Night	6% 13% 5% 13% 8% 6% 7% 4 7% 9% 22%	2699
	11th to 20th	Night	5% 11% 4 10% 8% 7% 6% 5% 7% 7% 30%	2532
	21st to end	Night	3 8% 4 11% 10% 6% 7% 4 7% 8% 32%	2145
March	1st to 10th	Night	5% 10% 4 11% 7% 7% 7% 6% 8% 10% 25%	5341
	11th to 20th	Night	6% 11% 6% 14% 7% 5% 5% 5% 7% 9% 25%	5000
	21st to end	Night	9% 11% 5% 11% 6% 5% 6% 5% 7% 9% 27%	5316
April	1st to 10th	Night	5% 9% 4 7% 6% 5% 5% 4 7% 9% 39%	2000
	11th to 20th	Night	9% 11% 3 9% 5% 6% 6% 4 7% 8% 32%	1791
	21st to end	Night	13% 9% 3 9% 5% 4 5% 4 5% 6% 36%	1660
May	1st to 10th	Night	12% 10% 3 7% 4 4 4 3 5% 7% 41%	3640
	11th to 20th	Night	13% 8% 3 7% 5% 5% 6% 6% 7% 9% 32%	3401
	21st to end	Night	13% 8% 3 6% 5% 5% 5% 4 6% 6% 40%	3470
June	1st to 10th	Night	10% 7% 3 7% 5% 5% 6% 5% 7% 9% 35%	1200
	11th to 20th	Night	18% 8% 3 7% 5% 5% 6% 5% 7% 7% 30%	1200
	21st to end	Night	10% 4 2 6% 5% 5% 6% 4 7% 10% 41%	1200
July	1st to 10th	Night	6% 3 2 5% 5% 5% 4 4 7% 10% 49%	3058
	11th to 20th	Night	8% 3 1 6% 5% 5% 5% 4 6% 9% 47%	3180
	21st to end	Night	5% 4 2 5% 4 4 5% 5% 6% 8% 51%	3467
August	1st to 10th	Night	8% 5% 2 6% 4 4 4 4 6% 8% 48%	2539
	11th to 20th	Night	7% 5% 2 5% 4 5% 5% 5% 9% 9% 45%	2755
	21st to end	Night	10% 4 2 5% 3 3 4 3 6% 8% 51%	3245
September	1st to 10th	Night	9% 6% 2 5% 4 4 4 4 6% 7% 49%	1995
	11th to 20th	Night	11% 6% 3 5% 4 3 4 5% 5% 8% 45%	2005
	21st to end	Night	7% 6% 2 6% 3 3 4 4 6% 8% 51%	2290
October	1st to 10th	Night	9% 8% 2 6% 4 4 4 4 5% 7% 47%	3920
	11th to 20th	Night	6% 6% 2 7% 4 4 5% 4 5% 9% 50%	3874
	21st to end	Night	8% 10% 4 9% 4 4 4 4 6% 7% 39%	4655
November	1st to 10th	Night	15% 15% 4 8% 7% 5% 4 4 5% 6% 26%	2730
	11th to 20th	Night	8% 13% 5% 15% 7% 5% 5% 4 5% 6% 26%	2800
	21st to end	Night	5% 13% 6% 14% 7% 5% 5% 4 6% 8% 27%	2960
December	1st to 10th	Night	8% 14% 6% 13% 7% 7% 6% 4 6% 7% 21%	5220
	11th to 20th	Night	5% 14% 5% 16% 9% 8% 8% 4 6% 7% 17%	5933
	21st to end	Night	3 7% 4 13% 10% 6% 5% 4 5% 6% 39%	7826

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	62% 5% 9% 20% 4	3179
	11th to 20th	Day	52% 8% 12% 16% 11% 1	3180
	21st to end	Day	56% 6% 19% 15% 4	3498
February	1st to 10th	Day	61% 5% 12% 14% 8%	1717
	11th to 20th	Day	55% 6% 13% 17% 9% 1	1764
	21st to end	Day	55% 8% 12% 17% 8%	1485
March	1st to 10th	Day	52% 6% 21% 16% 5%	4536
	11th to 20th	Day	54% 8% 15% 18% 5%	5000
	21st to end	Day	55% 5% 10% 19% 11%	5651
April	1st to 10th	Day	44% 8% 16% 21% 11%	2400
	11th to 20th	Day	51% 6% 12% 20% 10% 1	2560
	21st to end	Day	46% 7% 13% 23% 9% 1	2740
May	1st to 10th	Day	42% 4 12% 25% 13% 4	6340
	11th to 20th	Day	51% 6% 12% 23% 9%	6492
	21st to end	Day	41% 8% 14% 24% 12% 2	7406
June	1st to 10th	Day	47% 7% 14% 21% 10% 1	3195
	11th to 20th	Day	54% 7% 13% 18% 7% 1	3200
	21st to end	Day	42% 9% 19% 24% 6%	3200
July	1st to 10th	Day	28% 7% 28% 31% 7%	6811
	11th to 20th	Day	38% 7% 16% 35% 4	6699
	21st to end	Day	29% 8% 21% 35% 7%	7169
August	1st to 10th	Day	36% 6% 21% 31% 5%	4600
	11th to 20th	Day	33% 8% 21% 33% 6%	4343
	21st to end	Day	34% 5% 23% 32% 6%	4663
September	1st to 10th	Day	35% 6% 18% 27% 11% 3	2405
	11th to 20th	Day	43% 5% 18% 27% 7%	2392
	21st to end	Day	32% 6% 19% 29% 12% 2	2110
October	1st to 10th	Day	38% 5% 24% 24% 8%	3270
	11th to 20th	Day	38% 4 17% 35% 7%	3230
	21st to end	Day	45% 6% 20% 25% 4	2868
November	1st to 10th	Day	59% 6% 14% 16% 6%	1568
	11th to 20th	Day	61% 7% 14% 14% 4	1600
	21st to end	Day	57% 7% 17% 17% 3	1433
December	1st to 10th	Day	58% 9% 14% 13% 5% 1	1960
	11th to 20th	Day	68% 7% 12% 11% 3	2260
	21st to end	Day	48% 5% 11% 22% 13% 1	3112
January	1st to 10th	Night	59% 8% 13% 15% 5%	6766
	11th to 20th	Night	58% 5% 12% 15% 10%	6780
	21st to end	Night	52% 7% 20% 17% 4	7458
February	1st to 10th	Night	56% 6% 12% 17% 8%	2699
	11th to 20th	Night	51% 6% 14% 19% 11%	2533
	21st to end	Night	46% 6% 14% 24% 10%	2145
March	1st to 10th	Night	51% 7% 17% 18% 7%	5341
	11th to 20th	Night	52% 8% 13% 20% 6%	5000
	21st to end	Night	52% 6% 11% 20% 11%	5316
April	1st to 10th	Night	40% 7% 13% 23% 16% 1	2000
	11th to 20th	Night	48% 5% 12% 22% 12% 2	1791
	21st to end	Night	48% 6% 11% 22% 12% 2	1660
May	1st to 10th	Night	41% 5% 9% 25% 18% 2	3640
	11th to 20th	Night	45% 7% 11% 24% 12% 1	3401
	21st to end	Night	42% 8% 12% 24% 13% 1	3470
June	1st to 10th	Night	42% 7% 15% 24% 10% 2	1200
	11th to 20th	Night	50% 7% 14% 19% 9% 1	1200
	21st to end	Night	36% 8% 22% 25% 8% 1	1200
July	1st to 10th	Night	29% 8% 26% 30% 7%	3023
	11th to 20th	Night	33% 6% 15% 39% 8%	3138
	21st to end	Night	29% 7% 22% 32% 9% 1	3369
August	1st to 10th	Night	34% 7% 22% 30% 6%	2532
	11th to 20th	Night	31% 8% 23% 29% 9% 1	2779
	21st to end	Night	30% 5% 20% 36% 8%	3245
September	1st to 10th	Night	33% 6% 16% 29% 12% 4	1995
	11th to 20th	Night	36% 7% 15% 30% 10% 1	2005
	21st to end	Night	30% 7% 16% 32% 13% 2	2290
October	1st to 10th	Night	37% 5% 20% 31% 7%	3920
	11th to 20th	Night	33% 5% 13% 36% 13%	3874
	21st to end	Night	44% 5% 20% 26% 5%	4655
November	1st to 10th	Night	58% 7% 12% 17% 6% 1	2730
	11th to 20th	Night	60% 7% 14% 15% 4	2800
	21st to end	Night	55% 7% 18% 17% 4	2960
December	1st to 10th	Night	61% 7% 17% 11% 4 1	5220
	11th to 20th	Night	65% 6% 15% 11% 3	5931
	21st to end	Night	46% 5% 11% 25% 12% 1	7826

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	15% 6% 25% 32% 16% 7%	200
	11th to 20th	Day	12% 7% 25% 32% 21% 5%	200
	21st to end	Day	13% 10% 26% 30% 16% 5%	220
February	1st to 10th	Day	11% 6% 34% 33% 14% 3	295
	11th to 20th	Day	12% 4 23% 34% 24% 4	300
	21st to end	Day	4 7% 28% 31% 25% 5%	249
March	1st to 10th	Day	7% 10% 28% 34% 19% 3	344
	11th to 20th	Day	10% 9% 32% 31% 12% 6%	500
	21st to end	Day	15% 6% 27% 32% 18% 2	550
April	1st to 10th	Day	10% 11% 33% 31% 12% 4	500
	11th to 20th	Day	14% 13% 28% 29% 12% 3	492
	21st to end	Day	14% 8% 31% 29% 14% 3	640
May	1st to 10th	Day	12% 10% 28% 29% 17% 5%	703
	11th to 20th	Day	10% 11% 23% 32% 19% 6%	725
	21st to end	Day	14% 8% 22% 29% 17% 9%	789
June	1st to 10th	Day	15% 11% 27% 30% 14% 3	730
	11th to 20th	Day	22% 12% 22% 23% 17% 5%	730
	21st to end	Day	13% 7% 17% 32% 24% 7%	730
July	1st to 10th	Day	11% 6% 17% 36% 23% 7%	721
	11th to 20th	Day	12% 7% 21% 30% 21% 9%	718
	21st to end	Day	9% 4 21% 31% 27% 8%	794
August	1st to 10th	Day	12% 6% 19% 28% 26% 10%	726
	11th to 20th	Day	10% 7% 21% 31% 25% 6%	611
	21st to end	Day	12% 6% 23% 30% 22% 8%	583
September	1st to 10th	Day	13% 8% 27% 29% 18% 5%	530
	11th to 20th	Day	20% 6% 24% 32% 16% 3	530
	21st to end	Day	12% 13% 28% 27% 18% 3	440
October	1st to 10th	Day	15% 5% 26% 35% 13% 5%	330
	11th to 20th	Day	13% 8% 31% 31% 12% 4	324
	21st to end	Day	14% 11% 30% 28% 14% 3	330
November	1st to 10th	Day	19% 6% 28% 32% 14% 1	300
	11th to 20th	Day	17% 10% 31% 31% 10% 1	300
	21st to end	Day	9% 9% 33% 31% 15% 4	255
December	1st to 10th	Day	11% 5% 19% 39% 21% 6%	200
	11th to 20th	Day	9% 10% 34% 34% 13% 2	200
	21st to end	Day	11% 2 26% 31% 22% 8%	220
January	1st to 10th	Night	10% 9% 30% 36% 15% 2	1000
	11th to 20th	Night	11% 7% 33% 37% 11% 2	1000
	21st to end	Night	13% 9% 34% 34% 10% 1	1100
February	1st to 10th	Night	10% 7% 28% 36% 18% 2	890
	11th to 20th	Night	10% 5% 29% 38% 15% 3	784
	21st to end	Night	6% 5% 20% 41% 26% 3	660
March	1st to 10th	Night	11% 4 30% 41% 13% 2	800
	11th to 20th	Night	10% 6% 33% 37% 13% 1	800
	21st to end	Night	12% 5% 26% 38% 17% 2	810
April	1st to 10th	Night	9% 7% 27% 40% 16% 2	600
	11th to 20th	Night	15% 8% 32% 30% 15% 1	593
	21st to end	Night	19% 6% 24% 36% 14% 1	600
May	1st to 10th	Night	14% 7% 25% 38% 15% 3	600
	11th to 20th	Night	12% 7% 25% 36% 18% 2	506
	21st to end	Night	17% 4 22% 38% 18% 1	433
June	1st to 10th	Night	14% 9% 26% 35% 16% 1	400
	11th to 20th	Night	23% 4 23% 28% 21% 3	400
	21st to end	Night	14% 4 18% 40% 24% 2	400
July	1st to 10th	Night	8% 4 17% 45% 23% 2	390
	11th to 20th	Night	12% 3 21% 43% 20% 2	388
	21st to end	Night	6% 3 24% 38% 24% 4	438
August	1st to 10th	Night	8% 3 20% 36% 29% 3	553
	11th to 20th	Night	9% 3 19% 42% 25% 2	594
	21st to end	Night	10% 5% 23% 38% 22% 2	660
September	1st to 10th	Night	11% 5% 22% 43% 17% 2	600
	11th to 20th	Night	14% 5% 21% 42% 17% 1	605
	21st to end	Night	10% 6% 30% 39% 14% 1	800
October	1st to 10th	Night	17% 6% 28% 36% 12% 1	800
	11th to 20th	Night	13% 6% 28% 38% 13% 2	792
	21st to end	Night	16% 8% 33% 33% 9% 1	1014
November	1st to 10th	Night	22% 6% 26% 35% 10% 1	975
	11th to 20th	Night	16% 8% 30% 33% 12% 2	1000
	21st to end	Night	10% 9% 31% 38% 10% 1	1000
December	1st to 10th	Night	11% 8% 28% 34% 16% 3	1000
	11th to 20th	Night	12% 8% 30% 37% 12% 1	1000
	21st to end	Night	9% 5% 27% 40% 17% 3	1100

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