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 2024-11-05.

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% 9% 3 9% 6% 5% 5% 4 6% 8% 36%	105462
	Night	8% 9% 3 9% 6% 5% 6% 4 6% 8% 35%	102124
Transparency	Day	44% 7% 17% 24% 7%	105205
	Night	45% 7% 16% 23% 8% 1	102027
Seeing	Day	13% 8% 25% 31% 18% 5%	15717
	Night	12% 6% 27% 37% 16% 2	24862

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% 15% 6% 16% 10% 8% 5% 4 4 5% 22%	2219
	11th to 20th	Day	5% 8% 4 11% 8% 10% 11% 6% 11% 10% 17%	2199
	21st to end	Day	6% 12% 5% 16% 7% 5% 4 4 6% 7% 28%	2442
February	1st to 10th	Day	8% 14% 6% 11% 8% 8% 7% 5% 6% 7% 20%	1630
	11th to 20th	Day	6% 13% 5% 12% 9% 7% 5% 3 6% 7% 26%	1665
	21st to end	Day	5% 11% 5% 14% 9% 7% 7% 5% 7% 7% 24%	1413
March	1st to 10th	Day	4 12% 4 10% 7% 7% 7% 6% 7% 8% 27%	3164
	11th to 20th	Day	5% 11% 5% 12% 6% 4 5% 4 6% 9% 34%	3489
	21st to end	Day	6% 10% 5% 13% 7% 6% 5% 4 5% 8% 31%	3938
April	1st to 10th	Day	7% 11% 3 9% 7% 5% 6% 4 6% 8% 35%	2280
	11th to 20th	Day	10% 11% 4 10% 6% 5% 5% 4 7% 8% 29%	2430
	21st to end	Day	13% 9% 4 8% 5% 5% 5% 4 6% 8% 33%	2603
May	1st to 10th	Day	15% 11% 3 8% 6% 5% 5% 4 5% 7% 30%	4430
	11th to 20th	Day	12% 9% 3 9% 6% 5% 6% 4 6% 7% 33%	4526
	21st to end	Day	14% 9% 4 9% 6% 6% 6% 4 6% 7% 30%	5161
June	1st to 10th	Day	14% 8% 3 8% 6% 5% 5% 5% 6% 8% 33%	3035
	11th to 20th	Day	21% 9% 3 7% 5% 5% 4 4 7% 7% 27%	3040
	21st to end	Day	11% 7% 3 7% 5% 6% 5% 5% 7% 8% 37%	3040
July	1st to 10th	Day	8% 4 2 5% 3 4 4 4 8% 9% 49%	4817
	11th to 20th	Day	8% 4 2 7% 5% 5% 6% 5% 7% 10% 42%	4740
	21st to end	Day	6% 4 2 5% 4 4 5% 4 6% 10% 51%	5138
August	1st to 10th	Day	12% 5% 2 5% 4 4 4 4 5% 8% 47%	4476
	11th to 20th	Day	7% 5% 2 6% 4 5% 5% 4 7% 11% 45%	4166
	21st to end	Day	10% 6% 2 5% 4 4 4 4 6% 9% 47%	4521
September	1st to 10th	Day	11% 5% 2 5% 4 4 5% 4 6% 9% 45%	2285
	11th to 20th	Day	15% 9% 2 7% 4 4 4 3 5% 6% 41%	2273
	21st to end	Day	9% 6% 2 5% 4 4 5% 5% 6% 8% 47%	2005
October	1st to 10th	Day	9% 10% 3 6% 4 4 4 4 6% 8% 43%	3170
	11th to 20th	Day	6% 7% 3 7% 5% 5% 4 3 7% 11% 41%	3150
	21st to end	Day	7% 8% 4 9% 5% 5% 6% 5% 6% 7% 37%	2868
November	1st to 10th	Day	12% 17% 5% 11% 6% 5% 4 4 5% 5% 27%	1520
	11th to 20th	Day	9% 16% 6% 15% 6% 4 5% 3 5% 5% 24%	1520
	21st to end	Day	6% 12% 5% 14% 8% 7% 6% 4 6% 8% 24%	1362
December	1st to 10th	Day	7% 13% 5% 14% 8% 7% 5% 5% 6% 6% 25%	1140
	11th to 20th	Day	6% 11% 6% 15% 6% 7% 7% 5% 4 7% 25%	1439
	21st to end	Day	3 9% 4 9% 6% 5% 5% 5% 7% 7% 41%	2168
January	1st to 10th	Night	5% 12% 6% 15% 9% 8% 7% 6% 6% 8% 19%	4726
	11th to 20th	Night	3 8% 3 14% 10% 11% 12% 6% 8% 8% 18%	4699
	21st to end	Night	6% 13% 4 13% 8% 6% 5% 3 6% 8% 28%	5214
February	1st to 10th	Night	6% 13% 5% 13% 8% 6% 6% 4 7% 9% 23%	2565
	11th to 20th	Night	5% 11% 4 10% 8% 6% 6% 5% 7% 7% 29%	2402
	21st to end	Night	3 9% 4 11% 10% 6% 7% 4 7% 8% 32%	2041
March	1st to 10th	Night	6% 12% 4 12% 8% 7% 6% 6% 8% 9% 23%	3701
	11th to 20th	Night	6% 10% 4 11% 6% 5% 6% 6% 8% 10% 29%	3490
	21st to end	Night	7% 8% 4 10% 6% 6% 6% 5% 8% 10% 31%	3711
April	1st to 10th	Night	5% 9% 4 7% 6% 4 5% 4 7% 9% 40%	1900
	11th to 20th	Night	9% 12% 3 10% 5% 6% 6% 4 7% 8% 32%	1701
	21st to end	Night	14% 9% 3 9% 5% 4 6% 3 6% 6% 35%	1577
May	1st to 10th	Night	16% 12% 3 7% 5% 5% 4 4 6% 8% 30%	2540
	11th to 20th	Night	13% 7% 2 5% 4 4 5% 5% 7% 8% 38%	2371
	21st to end	Night	18% 9% 3 7% 6% 5% 5% 4 6% 7% 30%	2414
June	1st to 10th	Night	10% 7% 3 8% 5% 5% 6% 5% 7% 9% 34%	1140
	11th to 20th	Night	19% 8% 3 7% 5% 4 6% 5% 7% 7% 30%	1140
	21st to end	Night	9% 4 2 6% 5% 6% 5% 4 7% 10% 42%	1140
July	1st to 10th	Night	7% 3 2 6% 5% 5% 5% 4 8% 9% 46%	2140
	11th to 20th	Night	5% 3 1 5% 4 4 4 4 6% 9% 54%	2220
	21st to end	Night	4 3 1 4 4 3 4 4 5% 9% 59%	2414
August	1st to 10th	Night	8% 4 2 7% 4 4 4 4 6% 8% 49%	2461
	11th to 20th	Night	6% 5% 2 5% 4 5% 5% 5% 9% 10% 45%	2670
	21st to end	Night	10% 4 2 5% 3 3 4 3 6% 8% 51%	3146
September	1st to 10th	Night	9% 6% 2 5% 4 4 4 4 6% 7% 48%	1895
	11th to 20th	Night	12% 6% 3 5% 4 3 4 5% 5% 8% 44%	1905
	21st to end	Night	7% 6% 2 6% 4 4 4 5% 6% 8% 49%	2175
October	1st to 10th	Night	9% 9% 2 6% 4 4 4 4 5% 7% 47%	3800
	11th to 20th	Night	5% 6% 2 7% 4 4 5% 4 5% 9% 49%	3778
	21st to end	Night	8% 10% 4 9% 4 4 4 4 6% 7% 39%	4655
November	1st to 10th	Night	15% 15% 5% 8% 8% 5% 4 4 5% 6% 26%	2659
	11th to 20th	Night	8% 12% 5% 15% 8% 6% 5% 4 5% 6% 26%	2660
	21st to end	Night	5% 13% 6% 14% 7% 5% 5% 3 6% 8% 28%	2811
December	1st to 10th	Night	7% 12% 5% 11% 8% 8% 6% 5% 6% 8% 25%	3040
	11th to 20th	Night	7% 14% 5% 17% 8% 7% 7% 4 5% 7% 20%	3753
	21st to end	Night	3 6% 3 9% 6% 5% 6% 4 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%	2280
	11th to 20th	Day	51% 6% 13% 20% 10% 1	2430
	21st to end	Day	47% 7% 13% 23% 9% 1	2603
May	1st to 10th	Day	52% 6% 13% 21% 8% 1	4430
	11th to 20th	Day	47% 7% 12% 23% 10% 1	4530
	21st to end	Day	48% 10% 14% 19% 9%	5162
June	1st to 10th	Day	48% 7% 14% 20% 9% 1	3035
	11th to 20th	Day	54% 7% 13% 19% 7% 1	3040
	21st to end	Day	42% 9% 18% 24% 6%	3040
July	1st to 10th	Day	29% 7% 27% 28% 8%	4743
	11th to 20th	Day	34% 8% 18% 35% 5%	4659
	21st to end	Day	28% 8% 19% 38% 7%	4976
August	1st to 10th	Day	35% 6% 22% 31% 5%	4458
	11th to 20th	Day	32% 7% 22% 33% 6%	4208
	21st to end	Day	34% 5% 23% 32% 5%	4520
September	1st to 10th	Day	35% 6% 18% 26% 11% 3	2285
	11th to 20th	Day	44% 5% 17% 27% 7%	2273
	21st to end	Day	33% 7% 19% 28% 11% 2	2005
October	1st to 10th	Day	39% 5% 24% 24% 8%	3170
	11th to 20th	Day	38% 4 17% 35% 6%	3150
	21st to end	Day	45% 6% 20% 25% 4	2868
November	1st to 10th	Day	58% 6% 14% 16% 6%	1520
	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	40% 7% 13% 23% 16%	1900
	11th to 20th	Night	48% 5% 12% 22% 11% 2	1701
	21st to end	Night	49% 6% 11% 21% 11% 2	1577
May	1st to 10th	Night	49% 7% 12% 22% 10%	2540
	11th to 20th	Night	39% 9% 11% 25% 15% 2	2371
	21st to end	Night	48% 9% 13% 21% 7% 1	2414
June	1st to 10th	Night	44% 8% 15% 23% 9% 2	1140
	11th to 20th	Night	51% 7% 13% 19% 10% 1	1140
	21st to end	Night	35% 8% 23% 25% 9% 1	1140
July	1st to 10th	Night	31% 9% 24% 27% 8% 1	2105
	11th to 20th	Night	26% 6% 16% 42% 10%	2178
	21st to end	Night	23% 6% 23% 35% 12% 1	2337
August	1st to 10th	Night	33% 7% 22% 31% 6%	2454
	11th to 20th	Night	31% 8% 23% 29% 9% 1	2694
	21st to end	Night	31% 5% 21% 36% 8%	3146
September	1st to 10th	Night	33% 6% 17% 27% 13% 4	1895
	11th to 20th	Night	37% 7% 15% 30% 10% 1	1905
	21st to end	Night	31% 7% 16% 30% 13% 2	2175
October	1st to 10th	Night	37% 5% 20% 31% 7%	3800
	11th to 20th	Night	33% 5% 14% 36% 12%	3778
	21st to end	Night	44% 5% 20% 26% 5%	4655
November	1st to 10th	Night	58% 7% 12% 16% 6% 1	2659
	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	10% 12% 33% 30% 12% 4	460
	11th to 20th	Day	15% 12% 27% 29% 13% 3	452
	21st to end	Day	15% 9% 32% 28% 13% 3	593
May	1st to 10th	Day	12% 10% 27% 29% 17% 5%	653
	11th to 20th	Day	9% 9% 22% 33% 20% 6%	675
	21st to end	Day	14% 8% 22% 29% 18% 9%	734
June	1st to 10th	Day	14% 10% 27% 31% 15% 4	680
	11th to 20th	Day	23% 12% 22% 24% 15% 5%	680
	21st to end	Day	13% 8% 17% 32% 24% 7%	680
July	1st to 10th	Day	11% 5% 17% 37% 23% 7%	671
	11th to 20th	Day	12% 6% 21% 31% 21% 9%	668
	21st to end	Day	9% 5% 22% 30% 27% 8%	739
August	1st to 10th	Day	11% 6% 18% 29% 27% 9%	676
	11th to 20th	Day	10% 7% 21% 31% 26% 6%	566
	21st to end	Day	13% 6% 24% 29% 22% 6%	539
September	1st to 10th	Day	13% 9% 28% 28% 17% 5%	490
	11th to 20th	Day	21% 6% 24% 32% 15% 2	490
	21st to end	Day	13% 13% 27% 27% 18% 3	405
October	1st to 10th	Day	17% 6% 26% 34% 13% 5%	300
	11th to 20th	Day	13% 7% 31% 33% 13% 4	300
	21st to end	Day	14% 11% 30% 28% 14% 3	330
November	1st to 10th	Day	20% 6% 27% 32% 15% 1	282
	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% 27% 39% 15% 2	570
	11th to 20th	Night	15% 7% 31% 30% 15% 1	563
	21st to end	Night	20% 6% 25% 36% 13% 1	570
May	1st to 10th	Night	14% 7% 25% 37% 15% 3	570
	11th to 20th	Night	11% 6% 25% 37% 18% 2	481
	21st to end	Night	18% 4 21% 38% 18% 1	411
June	1st to 10th	Night	14% 8% 25% 36% 16% 1	380
	11th to 20th	Night	24% 4 22% 28% 20% 3	380
	21st to end	Night	13% 4 18% 40% 24% 2	380
July	1st to 10th	Night	8% 4 18% 46% 23% 2	370
	11th to 20th	Night	11% 3 22% 43% 20% 2	368
	21st to end	Night	6% 3 25% 37% 24% 4	416
August	1st to 10th	Night	8% 3 21% 36% 29% 3	525
	11th to 20th	Night	9% 3 19% 42% 26% 2	564
	21st to end	Night	10% 4 24% 38% 22% 1	627
September	1st to 10th	Night	11% 5% 23% 43% 16% 2	570
	11th to 20th	Night	15% 5% 22% 41% 16% 1	575
	21st to end	Night	11% 6% 30% 38% 15% 1	760
October	1st to 10th	Night	18% 6% 27% 36% 12% 1	760
	11th to 20th	Night	14% 6% 28% 38% 13% 2	760
	21st to end	Night	16% 8% 33% 33% 9% 1	1014
November	1st to 10th	Night	22% 6% 26% 35% 10% 1	950
	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 2024-11-03 00:11:09. Version ac07

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