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 2024-11-05.

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	8% 16% 5% 11% 6% 5% 4 3 5% 6% 32%	105693
	Night	7% 15% 5% 12% 6% 5% 5% 4 5% 6% 29%	101921
Transparency	Day	24% 49% 7% 10% 7% 2	105453
	Night	23% 51% 9% 10% 6% 1	101807
Seeing	Day	17% 22% 31% 21% 8% 2	14923
	Night	11% 14% 32% 28% 12% 1	23295

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% 28% 11% 13% 6% 5% 4 3 4 6% 15%	2281
	11th to 20th	Day	3 17% 6% 16% 9% 7% 3 3 4 6% 26%	2516
	21st to end	Day	6% 19% 7% 18% 9% 7% 6% 4 5% 5% 15%	2794
February	1st to 10th	Day	5% 24% 7% 16% 7% 6% 4 3 6% 6% 15%	1635
	11th to 20th	Day	5% 19% 8% 15% 7% 5% 5% 4 5% 5% 21%	1665
	21st to end	Day	4 24% 9% 14% 9% 6% 7% 4 4 3 16%	1517
March	1st to 10th	Day	2 17% 7% 16% 9% 7% 6% 5% 5% 5% 20%	3138
	11th to 20th	Day	3 20% 7% 11% 5% 5% 4 3 4 5% 35%	3422
	21st to end	Day	7% 25% 7% 14% 7% 6% 5% 4 4 4 16%	4058
April	1st to 10th	Day	8% 25% 8% 15% 7% 5% 5% 3 4 6% 13%	2280
	11th to 20th	Day	6% 22% 7% 12% 7% 5% 5% 4 5% 6% 20%	2252
	21st to end	Day	11% 24% 7% 11% 7% 5% 4 3 4 5% 18%	2596
May	1st to 10th	Day	9% 20% 4 10% 5% 5% 4 3 4 5% 32%	4420
	11th to 20th	Day	12% 16% 4 8% 4 5% 4 4 5% 10% 28%	4377
	21st to end	Day	19% 26% 6% 12% 6% 4 4 2 3 4 14%	4813
June	1st to 10th	Day	19% 15% 3 9% 6% 4 5% 4 4 6% 23%	2708
	11th to 20th	Day	20% 19% 4 10% 6% 5% 4 4 5% 5% 19%	2850
	21st to end	Day	13% 11% 3 8% 5% 4 6% 4 5% 7% 34%	2850
July	1st to 10th	Day	6% 5% 2 5% 3 3 3 3 4 5% 62%	4740
	11th to 20th	Day	5% 4 1 3 3 3 3 3 4 5% 68%	4521
	21st to end	Day	5% 6% 2 5% 3 3 3 3 5% 6% 58%	4790
August	1st to 10th	Day	4 4 1 5% 4 4 4 3 5% 7% 59%	4401
	11th to 20th	Day	6% 6% 2 8% 5% 5% 5% 4 6% 7% 43%	4176
	21st to end	Day	10% 9% 3 10% 5% 5% 4 3 5% 5% 40%	4278
September	1st to 10th	Day	9% 8% 3 7% 4 4 4 3 3 7% 48%	2280
	11th to 20th	Day	11% 11% 4 10% 5% 5% 4 3 5% 6% 37%	2280
	21st to end	Day	13% 14% 5% 8% 4 4 4 3 5% 6% 35%	2033
October	1st to 10th	Day	7% 14% 4 9% 5% 4 5% 5% 7% 8% 33%	3180
	11th to 20th	Day	13% 19% 6% 11% 4 4 4 4 4 5% 26%	3161
	21st to end	Day	8% 21% 8% 14% 7% 6% 4 3 3 5% 20%	3103
November	1st to 10th	Day	10% 24% 7% 13% 7% 5% 6% 4 4 4 16%	1591
	11th to 20th	Day	9% 23% 6% 13% 9% 5% 3 3 4 3 22%	1520
	21st to end	Day	7% 18% 7% 16% 7% 6% 5% 4 5% 6% 19%	1520
December	1st to 10th	Day	6% 17% 7% 16% 8% 6% 3 3 4 6% 23%	1520
	11th to 20th	Day	4 17% 7% 16% 8% 7% 6% 5% 6% 6% 18%	1925
	21st to end	Day	4 16% 7% 18% 9% 7% 7% 5% 7% 6% 14%	2502
January	1st to 10th	Night	5% 23% 10% 18% 9% 6% 5% 3 4 4 13%	4659
	11th to 20th	Night	6% 15% 6% 15% 8% 5% 6% 4 5% 7% 23%	4382
	21st to end	Night	7% 19% 7% 15% 9% 7% 7% 4 5% 6% 13%	4862
February	1st to 10th	Night	6% 23% 8% 17% 8% 5% 5% 3 4 5% 16%	2542
	11th to 20th	Night	4 20% 8% 16% 6% 5% 5% 4 4 5% 22%	2402
	21st to end	Night	5% 20% 7% 16% 9% 7% 6% 4 5% 5% 16%	1937
March	1st to 10th	Night	3 13% 6% 15% 8% 8% 7% 6% 7% 8% 20%	3736
	11th to 20th	Night	2 17% 7% 11% 5% 5% 4 3 5% 6% 35%	3556
	21st to end	Night	4 21% 6% 15% 9% 7% 6% 4 5% 5% 18%	3595
April	1st to 10th	Night	5% 20% 7% 13% 8% 7% 4 5% 4 6% 21%	1900
	11th to 20th	Night	6% 19% 6% 11% 8% 6% 6% 3 5% 7% 25%	1879
	21st to end	Night	6% 21% 6% 11% 7% 5% 6% 4 5% 7% 22%	1581
May	1st to 10th	Night	6% 18% 5% 9% 5% 4 3 3 4 5% 38%	2540
	11th to 20th	Night	7% 15% 4 8% 5% 4 4 4 6% 7% 37%	2516
	21st to end	Night	12% 18% 5% 12% 6% 6% 6% 4 5% 6% 20%	2762
June	1st to 10th	Night	13% 13% 4 8% 5% 5% 5% 3 6% 8% 30%	1467
	11th to 20th	Night	13% 13% 3 9% 6% 5% 5% 4 7% 9% 25%	1330
	21st to end	Night	11% 8% 3 8% 4 5% 4 3 5% 7% 42%	1330
July	1st to 10th	Night	4 4 2 4 3 2 3 3 4 8% 64%	2220
	11th to 20th	Night	2 3 1 3 2 2 2 2 3 5% 74%	2434
	21st to end	Night	3 4 2 5% 3 2 3 3 3 8% 64%	2762
August	1st to 10th	Night	3 3 1 3 3 4 3 3 5% 6% 65%	2529
	11th to 20th	Night	4 6% 2 7% 4 4 5% 4 7% 11% 47%	2654
	21st to end	Night	9% 9% 3 7% 4 4 4 3 5% 7% 44%	3397
September	1st to 10th	Night	8% 7% 3 6% 4 4 4 4 5% 6% 49%	1900
	11th to 20th	Night	11% 10% 4 6% 4 5% 4 4 5% 7% 40%	1900
	21st to end	Night	11% 11% 5% 9% 5% 5% 5% 3 5% 6% 35%	2142
October	1st to 10th	Night	7% 12% 4 10% 5% 5% 5% 3 6% 9% 35%	3800
	11th to 20th	Night	14% 15% 4 10% 6% 4 4 4 5% 6% 28%	3777
	21st to end	Night	8% 17% 7% 15% 7% 5% 4 3 5% 5% 25%	4454
November	1st to 10th	Night	10% 20% 7% 15% 7% 6% 5% 4 5% 6% 16%	2584
	11th to 20th	Night	9% 21% 7% 13% 7% 6% 5% 3 4 5% 20%	2660
	21st to end	Night	7% 20% 7% 14% 8% 6% 5% 4 5% 6% 18%	2660
December	1st to 10th	Night	7% 16% 6% 15% 9% 6% 6% 5% 6% 5% 21%	2660
	11th to 20th	Night	6% 19% 7% 16% 10% 8% 5% 4 5% 6% 15%	3280
	21st to end	Night	5% 16% 7% 16% 9% 6% 6% 5% 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	40% 44% 5% 7% 3 1	2281
	11th to 20th	Day	36% 37% 10% 8% 6% 3	2540
	21st to end	Day	38% 48% 9% 4 1	2794
February	1st to 10th	Day	23% 68% 4 3 2 1	1635
	11th to 20th	Day	24% 65% 5% 4 2 1	1674
	21st to end	Day	22% 66% 4 5% 2	1517
March	1st to 10th	Day	31% 46% 5% 10% 7% 1	3138
	11th to 20th	Day	20% 44% 13% 19% 4	3422
	21st to end	Day	40% 43% 7% 3 7%	4058
April	1st to 10th	Day	24% 66% 4 5%	2280
	11th to 20th	Day	18% 68% 5% 7% 2	2252
	21st to end	Day	22% 66% 4 5% 3	2596
May	1st to 10th	Day	25% 45% 6% 17% 7%	4420
	11th to 20th	Day	27% 45% 15% 12% 1	4380
	21st to end	Day	44% 45% 7% 4	4814
June	1st to 10th	Day	18% 66% 5% 8% 3	2708
	11th to 20th	Day	19% 66% 5% 6% 3	2850
	21st to end	Day	17% 65% 5% 9% 4	2850
July	1st to 10th	Day	9% 37% 4 8% 27% 15%	4666
	11th to 20th	Day	10% 36% 4 10% 24% 18%	4442
	21st to end	Day	14% 39% 9% 18% 16% 5%	4639
August	1st to 10th	Day	10% 38% 5% 13% 27% 6%	4384
	11th to 20th	Day	21% 44% 14% 15% 4 2	4218
	21st to end	Day	23% 42% 8% 18% 9% 1	4277
September	1st to 10th	Day	17% 60% 6% 10% 7% 1	2280
	11th to 20th	Day	21% 61% 4 7% 6% 1	2280
	21st to end	Day	20% 61% 7% 8% 4	2033
October	1st to 10th	Day	19% 44% 13% 17% 6%	3180
	11th to 20th	Day	32% 43% 8% 12% 5%	3161
	21st to end	Day	29% 44% 13% 8% 7%	3103
November	1st to 10th	Day	25% 63% 5% 5% 1	1591
	11th to 20th	Day	22% 61% 6% 6% 4 1	1520
	21st to end	Day	20% 63% 5% 7% 3 2	1520
December	1st to 10th	Day	23% 63% 3 6% 4 1	1520
	11th to 20th	Day	24% 54% 13% 7% 2	1928
	21st to end	Day	37% 44% 9% 8% 2	2502
January	1st to 10th	Night	39% 46% 7% 6% 2 1	4659
	11th to 20th	Night	33% 41% 8% 9% 6% 3	4420
	21st to end	Night	35% 51% 9% 4 1	4862
February	1st to 10th	Night	24% 67% 4 3 2 1	2542
	11th to 20th	Night	22% 66% 4 5% 2 1	2404
	21st to end	Night	21% 66% 4 9% 1	1937
March	1st to 10th	Night	20% 50% 8% 12% 8% 1	3736
	11th to 20th	Night	18% 46% 12% 20% 4	3557
	21st to end	Night	34% 48% 9% 7% 3	3595
April	1st to 10th	Night	17% 68% 5% 8% 2	1900
	11th to 20th	Night	18% 66% 7% 7% 2	1879
	21st to end	Night	19% 67% 6% 4 4	1581
May	1st to 10th	Night	24% 44% 6% 19% 7%	2540
	11th to 20th	Night	22% 44% 14% 17% 2	2516
	21st to end	Night	33% 51% 10% 5%	2762
June	1st to 10th	Night	13% 67% 9% 9% 3	1467
	11th to 20th	Night	13% 66% 6% 10% 5%	1330
	21st to end	Night	13% 65% 8% 12% 2 1	1330
July	1st to 10th	Night	7% 36% 4 15% 26% 13%	2185
	11th to 20th	Night	7% 35% 5% 11% 28% 14%	2390
	21st to end	Night	11% 37% 12% 17% 14% 8%	2674
August	1st to 10th	Night	8% 38% 6% 21% 26% 2	2521
	11th to 20th	Night	13% 46% 18% 18% 5% 1	2678
	21st to end	Night	20% 41% 13% 16% 10%	3397
September	1st to 10th	Night	14% 61% 8% 11% 6% 1	1900
	11th to 20th	Night	17% 62% 5% 10% 5% 1	1900
	21st to end	Night	19% 62% 7% 8% 3	2142
October	1st to 10th	Night	20% 43% 15% 18% 5%	3800
	11th to 20th	Night	28% 42% 11% 12% 7%	3777
	21st to end	Night	27% 44% 13% 11% 5% 1	4454
November	1st to 10th	Night	27% 61% 6% 4 2	2584
	11th to 20th	Night	20% 64% 6% 6% 3 1	2660
	21st to end	Night	21% 63% 5% 5% 4 2	2660
December	1st to 10th	Night	22% 63% 6% 5% 3 1	2660
	11th to 20th	Night	30% 54% 7% 6% 2	3276
	21st to end	Night	31% 44% 12% 9% 4	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	13% 18% 34% 24% 9% 2	180
	21st to end	Day	12% 25% 32% 25% 5% 1	198
February	1st to 10th	Day	18% 28% 38% 13% 3	295
	11th to 20th	Day	18% 25% 38% 15% 4 1	365
	21st to end	Day	19% 25% 36% 13% 5% 1	357
March	1st to 10th	Day	18% 32% 29% 16% 5%	460
	11th to 20th	Day	19% 27% 25% 20% 9% 1	460
	21st to end	Day	21% 30% 28% 15% 6%	506
April	1st to 10th	Day	22% 27% 30% 15% 5% 1	460
	11th to 20th	Day	21% 27% 26% 18% 6% 2	452
	21st to end	Day	24% 25% 31% 13% 6% 2	460
May	1st to 10th	Day	18% 22% 31% 21% 6% 1	463
	11th to 20th	Day	23% 18% 27% 20% 10% 2	488
	21st to end	Day	26% 19% 27% 19% 7% 2	529
June	1st to 10th	Day	20% 26% 28% 20% 5% 1	538
	11th to 20th	Day	23% 26% 32% 13% 5% 1	680
	21st to end	Day	15% 20% 32% 22% 10% 1	680
July	1st to 10th	Day	11% 17% 38% 26% 8% 1	671
	11th to 20th	Day	9% 17% 36% 27% 9% 2	542
	21st to end	Day	7% 15% 34% 30% 10% 4	531
August	1st to 10th	Day	9% 10% 32% 31% 13% 4	487
	11th to 20th	Day	6% 14% 28% 33% 14% 4	477
	21st to end	Day	11% 19% 31% 25% 12% 3	539
September	1st to 10th	Day	13% 20% 30% 24% 11% 3	490
	11th to 20th	Day	16% 20% 26% 27% 11% 1	490
	21st to end	Day	23% 22% 27% 18% 8% 2	490
October	1st to 10th	Day	18% 22% 28% 19% 10% 2	490
	11th to 20th	Day	22% 22% 24% 20% 9% 2	490
	21st to end	Day	25% 18% 30% 20% 5% 2	332
November	1st to 10th	Day	22% 21% 32% 20% 4 1	225
	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	15% 22% 35% 20% 7% 1	830
	11th to 20th	Night	10% 17% 41% 21% 10%	760
	21st to end	Night	10% 15% 41% 25% 6% 2	836
February	1st to 10th	Night	14% 18% 38% 23% 7% 1	760
	11th to 20th	Night	9% 15% 40% 27% 9%	744
	21st to end	Night	14% 18% 34% 23% 9% 1	628
March	1st to 10th	Night	11% 17% 34% 26% 10% 1	760
	11th to 20th	Night	9% 19% 37% 27% 8% 1	760
	21st to end	Night	10% 21% 36% 26% 8% 1	836
April	1st to 10th	Night	13% 15% 33% 28% 10% 1	760
	11th to 20th	Night	12% 16% 35% 26% 11% 1	751
	21st to end	Night	12% 14% 32% 32% 8% 1	441
May	1st to 10th	Night	9% 11% 27% 37% 14% 1	380
	11th to 20th	Night	14% 9% 16% 39% 21% 1	374
	21st to end	Night	16% 6% 24% 35% 19% 1	411
June	1st to 10th	Night	13% 9% 33% 32% 13% 1	380
	11th to 20th	Night	13% 14% 27% 32% 14% 1	380
	21st to end	Night	12% 6% 21% 43% 16% 2	380
July	1st to 10th	Night	6% 6% 22% 40% 24% 1	370
	11th to 20th	Night	4 5% 26% 42% 23% 1	368
	21st to end	Night	4 4 20% 46% 25% 1	416
August	1st to 10th	Night	4 4 13% 42% 37% 1	378
	11th to 20th	Night	5% 3 15% 40% 33% 4	468
	21st to end	Night	9% 8% 23% 38% 21% 1	774
September	1st to 10th	Night	8% 8% 25% 35% 20% 5%	760
	11th to 20th	Night	12% 9% 22% 28% 24% 6%	760
	21st to end	Night	14% 12% 30% 27% 14% 3	760
October	1st to 10th	Night	13% 13% 26% 31% 16% 1	760
	11th to 20th	Night	13% 17% 30% 26% 13% 1	760
	21st to end	Night	16% 19% 34% 22% 8% 1	836
November	1st to 10th	Night	14% 18% 43% 22% 3	760
	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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