Manning Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Manning Provincial Park clear sky chart from 2005-11-06 to 2024-01-12.

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 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	10% 15% 6% 10% 7% 4 5% 5% 5% 6% 29%	74954
	Night	8% 15% 6% 11% 8% 4 5% 5% 5% 6% 28%	74744
Transparency	Day	52% 9% 13% 16% 8% 2	74648
	Night	50% 11% 15% 16% 8% 1	74568
Seeing	Day	17% 22% 31% 21% 8% 2	13778
	Night	11% 14% 32% 28% 13% 1	22341

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	8% 22% 8% 11% 7% 4 5% 5% 6% 7% 16%	1365
	11th to 20th	Day	6% 18% 7% 11% 10% 6% 6% 4 6% 7% 20%	1448
	21st to end	Day	6% 17% 6% 13% 8% 4 6% 5% 4 6% 25%	1584
February	1st to 10th	Day	6% 22% 8% 14% 9% 4 5% 4 6% 7% 16%	1549
	11th to 20th	Day	6% 17% 9% 15% 8% 4 5% 5% 5% 6% 20%	1575
	21st to end	Day	4 20% 11% 14% 11% 5% 7% 5% 5% 3 16%	1430
March	1st to 10th	Day	4 18% 9% 14% 10% 5% 6% 5% 4 6% 18%	1800
	11th to 20th	Day	5% 22% 10% 12% 8% 4 7% 5% 5% 5% 17%	1938
	21st to end	Day	7% 23% 9% 13% 9% 4 6% 5% 5% 5% 12%	2308
April	1st to 10th	Day	9% 23% 9% 14% 8% 4 5% 4 4 6% 13%	2160
	11th to 20th	Day	7% 21% 8% 12% 8% 4 5% 5% 5% 6% 19%	2132
	21st to end	Day	12% 21% 8% 10% 8% 3 5% 4 4 5% 19%	2459
May	1st to 10th	Day	11% 20% 6% 9% 7% 4 5% 4 4 5% 25%	2520
	11th to 20th	Day	14% 15% 5% 8% 6% 4 5% 6% 6% 8% 23%	2477
	21st to end	Day	23% 16% 5% 9% 7% 3 4 3 4 5% 22%	2723
June	1st to 10th	Day	20% 14% 4 8% 7% 4 5% 5% 4 6% 23%	2565
	11th to 20th	Day	22% 16% 5% 9% 6% 3 5% 5% 5% 5% 19%	2700
	21st to end	Day	14% 10% 3 7% 6% 3 5% 5% 5% 7% 35%	2700
July	1st to 10th	Day	10% 8% 3 7% 5% 3 5% 4 5% 6% 44%	2700
	11th to 20th	Day	8% 6% 2 5% 4 3 5% 4 5% 6% 53%	2579
	21st to end	Day	5% 5% 2 4 3 2 3 3 5% 6% 62%	2741
August	1st to 10th	Day	7% 6% 2 4 5% 3 4 3 5% 6% 56%	2507
	11th to 20th	Day	7% 4 2 5% 4 2 4 4 5% 6% 57%	2386
	21st to end	Day	10% 7% 3 6% 6% 4 5% 5% 6% 7% 41%	2435
September	1st to 10th	Day	10% 9% 3 6% 5% 3 4 3 3 7% 47%	2160
	11th to 20th	Day	12% 10% 4 8% 7% 3 4 4 5% 6% 38%	2160
	21st to end	Day	14% 13% 5% 6% 5% 3 4 4 4 6% 36%	1926
October	1st to 10th	Day	11% 17% 5% 8% 6% 2 4 4 5% 6% 32%	1800
	11th to 20th	Day	10% 16% 4 10% 6% 4 6% 6% 5% 6% 28%	1800
	21st to end	Day	12% 18% 6% 10% 7% 4 5% 5% 4 5% 25%	1784
November	1st to 10th	Day	10% 21% 8% 11% 8% 5% 5% 6% 4 4 17%	1556
	11th to 20th	Day	9% 22% 6% 11% 10% 3 5% 3 4 4 22%	1520
	21st to end	Day	7% 17% 9% 15% 8% 5% 5% 5% 5% 7% 19%	1520
December	1st to 10th	Day	7% 15% 8% 15% 10% 4 5% 4 4 6% 23%	1520
	11th to 20th	Day	4 15% 7% 14% 10% 5% 8% 6% 5% 6% 19%	1925
	21st to end	Day	5% 15% 8% 16% 11% 5% 8% 6% 7% 6% 14%	2502
January	1st to 10th	Night	8% 20% 10% 13% 9% 5% 5% 5% 5% 4 18%	2795
	11th to 20th	Night	7% 15% 9% 13% 9% 4 6% 6% 5% 6% 18%	2540
	21st to end	Night	6% 18% 8% 12% 9% 4 6% 5% 5% 7% 20%	2772
February	1st to 10th	Night	6% 22% 9% 15% 10% 4 5% 4 3 5% 17%	2408
	11th to 20th	Night	4 19% 10% 15% 8% 4 5% 5% 4 5% 21%	2272
	21st to end	Night	6% 16% 9% 13% 10% 6% 7% 5% 5% 6% 17%	1826
March	1st to 10th	Night	5% 16% 8% 12% 8% 5% 7% 6% 6% 7% 21%	2160
	11th to 20th	Night	4 15% 8% 12% 10% 6% 6% 6% 6% 6% 20%	2020
	21st to end	Night	6% 20% 7% 13% 10% 5% 6% 6% 6% 5% 18%	2048
April	1st to 10th	Night	6% 17% 8% 12% 10% 4 6% 5% 4 6% 22%	1800
	11th to 20th	Night	6% 18% 7% 10% 8% 4 6% 4 5% 7% 24%	1779
	21st to end	Night	7% 19% 6% 10% 8% 4 6% 5% 4 8% 23%	1499
May	1st to 10th	Night	8% 17% 7% 8% 6% 3 6% 5% 5% 5% 32%	1440
	11th to 20th	Night	11% 13% 4 7% 6% 4 5% 5% 6% 8% 30%	1416
	21st to end	Night	14% 13% 5% 7% 5% 4 5% 4 5% 7% 29%	1552
June	1st to 10th	Night	14% 12% 4 7% 6% 4 5% 4 6% 8% 30%	1390
	11th to 20th	Night	14% 12% 4 8% 7% 4 7% 5% 6% 9% 25%	1260
	21st to end	Night	11% 7% 3 7% 5% 4 5% 5% 5% 7% 43%	1260
July	1st to 10th	Night	7% 7% 3 5% 4 2 4 4 5% 8% 50%	1260
	11th to 20th	Night	4 4 2 5% 4 2 4 4 5% 7% 58%	1376
	21st to end	Night	3 3 2 3 3 1 2 3 3 7% 69%	1576
August	1st to 10th	Night	4 5% 1 3 3 3 4 4 4 7% 61%	1432
	11th to 20th	Night	4 4 1 3 3 2 3 4 5% 8% 63%	1511
	21st to end	Night	6% 7% 3 6% 4 3 5% 5% 6% 7% 49%	1921
September	1st to 10th	Night	8% 7% 3 5% 5% 3 5% 4 5% 6% 49%	1800
	11th to 20th	Night	12% 9% 4 5% 5% 4 4 4 5% 7% 41%	1800
	21st to end	Night	11% 10% 5% 8% 6% 4 5% 4 5% 6% 35%	2029
October	1st to 10th	Night	10% 14% 4 9% 7% 4 4 4 5% 6% 33%	2160
	11th to 20th	Night	13% 14% 5% 11% 6% 4 4 5% 4 5% 28%	2160
	21st to end	Night	11% 18% 6% 11% 7% 4 4 4 5% 5% 25%	2571
November	1st to 10th	Night	11% 18% 8% 13% 8% 5% 6% 5% 5% 7% 16%	2519
	11th to 20th	Night	9% 20% 8% 11% 9% 4 5% 4 4 6% 20%	2660
	21st to end	Night	7% 18% 9% 13% 10% 5% 6% 5% 5% 6% 18%	2660
December	1st to 10th	Night	7% 14% 7% 14% 9% 4 7% 5% 6% 6% 21%	2660
	11th to 20th	Night	6% 18% 8% 15% 11% 6% 6% 5% 5% 6% 15%	3280
	21st to end	Night	6% 14% 7% 14% 11% 5% 6% 6% 7% 8% 15%	5132

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% 12% 10% 11% 3 1	1365
	11th to 20th	Day	55% 12% 14% 12% 5% 2	1448
	21st to end	Day	52% 10% 14% 14% 9% 1	1584
February	1st to 10th	Day	61% 11% 14% 8% 5% 1	1549
	11th to 20th	Day	60% 10% 13% 10% 5% 1	1584
	21st to end	Day	66% 8% 10% 12% 3	1430
March	1st to 10th	Day	60% 11% 13% 11% 4 1	1800
	11th to 20th	Day	61% 12% 11% 12% 4	1938
	21st to end	Day	69% 10% 12% 8% 2	2308
April	1st to 10th	Day	69% 10% 11% 9% 1	2160
	11th to 20th	Day	61% 10% 12% 10% 6% 1	2132
	21st to end	Day	63% 8% 13% 10% 6%	2459
May	1st to 10th	Day	56% 9% 14% 14% 6% 1	2520
	11th to 20th	Day	55% 9% 18% 15% 4	2480
	21st to end	Day	64% 8% 11% 14% 3	2724
June	1st to 10th	Day	60% 7% 12% 14% 5% 2	2565
	11th to 20th	Day	63% 9% 12% 12% 4	2700
	21st to end	Day	47% 8% 15% 20% 9% 1	2700
July	1st to 10th	Day	39% 8% 12% 23% 14% 4	2626
	11th to 20th	Day	31% 8% 13% 26% 19% 3	2500
	21st to end	Day	21% 6% 11% 29% 25% 7%	2589
August	1st to 10th	Day	28% 7% 13% 24% 21% 6%	2490
	11th to 20th	Day	26% 6% 16% 29% 18% 4	2386
	21st to end	Day	38% 8% 14% 26% 11% 2	2435
September	1st to 10th	Day	37% 5% 14% 25% 15% 4	2160
	11th to 20th	Day	46% 6% 9% 18% 18% 4	2160
	21st to end	Day	46% 6% 15% 17% 12% 3	1926
October	1st to 10th	Day	51% 7% 13% 21% 8%	1800
	11th to 20th	Day	51% 10% 11% 19% 8% 2	1800
	21st to end	Day	55% 9% 12% 16% 7%	1784
November	1st to 10th	Day	63% 13% 11% 9% 4	1556
	11th to 20th	Day	61% 9% 11% 11% 6% 2	1520
	21st to end	Day	57% 11% 11% 13% 6% 3	1520
December	1st to 10th	Day	58% 12% 11% 11% 6% 2	1520
	11th to 20th	Day	53% 14% 17% 11% 4 1	1928
	21st to end	Day	60% 13% 12% 11% 3	2502
January	1st to 10th	Night	63% 11% 10% 11% 4 1	2795
	11th to 20th	Night	57% 12% 13% 12% 5% 2	2540
	21st to end	Night	56% 9% 12% 12% 8% 2	2772
February	1st to 10th	Night	64% 10% 10% 10% 5%	2408
	11th to 20th	Night	57% 12% 13% 11% 5% 2	2274
	21st to end	Night	60% 12% 10% 15% 3	1826
March	1st to 10th	Night	54% 12% 16% 12% 6%	2160
	11th to 20th	Night	52% 14% 17% 13% 5%	2021
	21st to end	Night	59% 13% 17% 10% 2	2048
April	1st to 10th	Night	55% 13% 15% 13% 3	1800
	11th to 20th	Night	53% 9% 16% 13% 8%	1779
	21st to end	Night	53% 11% 16% 14% 6%	1499
May	1st to 10th	Night	47% 13% 16% 17% 6% 1	1440
	11th to 20th	Night	45% 12% 19% 18% 6%	1416
	21st to end	Night	48% 12% 20% 18% 3	1552
June	1st to 10th	Night	48% 10% 17% 17% 6% 2	1390
	11th to 20th	Night	48% 12% 18% 16% 5%	1260
	21st to end	Night	34% 11% 23% 23% 8% 1	1260
July	1st to 10th	Night	30% 8% 16% 28% 15% 2	1225
	11th to 20th	Night	22% 8% 20% 32% 16% 2	1332
	21st to end	Night	14% 5% 17% 33% 27% 4	1488
August	1st to 10th	Night	22% 9% 17% 27% 21% 5%	1424
	11th to 20th	Night	18% 9% 21% 31% 20% 2	1511
	21st to end	Night	29% 8% 19% 28% 14% 1	1921
September	1st to 10th	Night	30% 9% 16% 28% 15% 3	1800
	11th to 20th	Night	38% 7% 13% 20% 19% 3	1800
	21st to end	Night	44% 9% 15% 20% 9% 3	2029
October	1st to 10th	Night	46% 8% 15% 22% 9%	2160
	11th to 20th	Night	51% 9% 12% 17% 9% 1	2160
	21st to end	Night	54% 10% 11% 17% 8%	2571
November	1st to 10th	Night	60% 13% 12% 10% 5% 1	2519
	11th to 20th	Night	57% 13% 14% 10% 5% 2	2660
	21st to end	Night	58% 11% 11% 10% 7% 3	2660
December	1st to 10th	Night	56% 13% 12% 12% 6% 1	2660
	11th to 20th	Night	61% 13% 13% 9% 3 1	3276
	21st to end	Night	54% 13% 16% 12% 5%	5132

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% 26% 24% 23% 8% 2	180
	11th to 20th	Day	14% 17% 35% 23% 9% 2	162
	21st to end	Day	13% 24% 31% 27% 5% 1	176
February	1st to 10th	Day	19% 28% 39% 11% 3	269
	11th to 20th	Day	19% 26% 37% 14% 3 1	335
	21st to end	Day	16% 26% 38% 14% 6% 1	324
March	1st to 10th	Day	19% 33% 28% 15% 5%	420
	11th to 20th	Day	20% 27% 25% 20% 7%	420
	21st to end	Day	21% 31% 28% 14% 6%	462
April	1st to 10th	Day	22% 27% 31% 15% 5% 1	420
	11th to 20th	Day	22% 27% 25% 18% 6% 2	412
	21st to end	Day	24% 24% 33% 13% 5% 2	420
May	1st to 10th	Day	17% 23% 32% 20% 6% 1	423
	11th to 20th	Day	22% 18% 27% 21% 10% 2	448
	21st to end	Day	25% 18% 27% 20% 7% 2	485
June	1st to 10th	Day	19% 27% 29% 19% 5% 1	495
	11th to 20th	Day	22% 26% 33% 14% 5%	630
	21st to end	Day	14% 20% 32% 22% 10% 1	630
July	1st to 10th	Day	11% 16% 38% 26% 8% 1	621
	11th to 20th	Day	10% 18% 37% 25% 8% 2	499
	21st to end	Day	6% 15% 34% 29% 11% 5%	487
August	1st to 10th	Day	10% 11% 32% 31% 13% 4	447
	11th to 20th	Day	7% 14% 28% 32% 14% 4	437
	21st to end	Day	11% 19% 32% 25% 12% 3	495
September	1st to 10th	Day	14% 21% 31% 23% 9% 2	450
	11th to 20th	Day	16% 19% 26% 26% 12% 1	450
	21st to end	Day	22% 20% 28% 18% 8% 3	450
October	1st to 10th	Day	18% 21% 28% 20% 11% 2	450
	11th to 20th	Day	21% 23% 25% 20% 9% 2	450
	21st to end	Day	25% 18% 28% 21% 6% 2	299
November	1st to 10th	Day	21% 21% 31% 21% 5% 1	214
	11th to 20th	Day	21% 21% 31% 14% 11% 3	180
	21st to end	Day	17% 17% 35% 18% 8% 6%	180
December	1st to 10th	Day	14% 18% 30% 22% 12% 4	180
	11th to 20th	Day	13% 21% 39% 19% 7% 1	180
	21st to end	Day	13% 16% 43% 21% 8%	198
January	1st to 10th	Night	16% 22% 35% 19% 7% 1	830
	11th to 20th	Night	11% 17% 41% 21% 10%	726
	21st to end	Night	11% 15% 41% 26% 6% 2	792
February	1st to 10th	Night	15% 18% 38% 23% 6% 1	720
	11th to 20th	Night	9% 15% 40% 26% 10%	704
	21st to end	Night	12% 18% 35% 23% 10% 1	592
March	1st to 10th	Night	12% 18% 34% 26% 10% 1	720
	11th to 20th	Night	9% 19% 38% 26% 8% 1	720
	21st to end	Night	10% 21% 35% 25% 8% 1	792
April	1st to 10th	Night	12% 14% 33% 29% 11% 1	720
	11th to 20th	Night	12% 16% 34% 26% 11% 1	711
	21st to end	Night	12% 14% 32% 32% 9% 1	419
May	1st to 10th	Night	9% 11% 28% 37% 14% 1	360
	11th to 20th	Night	14% 8% 15% 39% 22% 1	354
	21st to end	Night	16% 4 23% 36% 20% 1	389
June	1st to 10th	Night	13% 9% 33% 32% 14% 1	360
	11th to 20th	Night	13% 13% 27% 33% 14% 1	360
	21st to end	Night	12% 6% 21% 44% 16% 2	360
July	1st to 10th	Night	7% 6% 21% 41% 25% 1	350
	11th to 20th	Night	4 5% 24% 43% 23% 1	348
	21st to end	Night	3 3 20% 46% 27% 1	394
August	1st to 10th	Night	4 4 11% 41% 38% 1	358
	11th to 20th	Night	5% 3 14% 41% 33% 4	443
	21st to end	Night	8% 8% 23% 38% 22% 1	733
September	1st to 10th	Night	8% 9% 26% 34% 19% 4	720
	11th to 20th	Night	12% 9% 21% 28% 25% 6%	720
	21st to end	Night	13% 12% 30% 28% 15% 3	720
October	1st to 10th	Night	14% 12% 25% 32% 16% 1	720
	11th to 20th	Night	13% 17% 30% 26% 13% 1	720
	21st to end	Night	16% 19% 34% 21% 9% 1	792
November	1st to 10th	Night	14% 18% 43% 22% 3	740
	11th to 20th	Night	17% 21% 35% 19% 7% 1	760
	21st to end	Night	11% 19% 38% 20% 9% 3	760
December	1st to 10th	Night	12% 13% 38% 25% 10% 1	760
	11th to 20th	Night	11% 18% 42% 24% 4 1	760
	21st to end	Night	11% 18% 42% 23% 5%	914

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