Campement Péribonka
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Campement Péribonka clear sky chart from 2005-11-06 to 2024-12-09.

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	17% 13% 4 10% 6% 5% 5% 4 5% 6% 24%	102061
	Night	15% 14% 5% 11% 7% 6% 5% 4 5% 5% 23%	97775
Transparency	Day	60% 6% 11% 16% 7% 1	105473
	Night	62% 6% 11% 15% 6%	102453
Seeing	Day	25% 15% 30% 19% 9% 2	15550
	Night	24% 13% 29% 25% 9% 1	23768

By Month

Percentage Cloud Cover NE (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	10% 17% 8% 22% 7% 5% 5% 4 4 4 15%	2252
	11th to 20th	Day	9% 14% 6% 18% 14% 14% 6% 3 4 3 9%	2520
	21st to end	Day	6% 13% 5% 17% 7% 6% 6% 4 5% 5% 26%	2772
February	1st to 10th	Day	6% 14% 5% 12% 9% 11% 8% 4 6% 5% 20%	1520
	11th to 20th	Day	9% 18% 5% 15% 10% 7% 5% 5% 5% 4 16%	1701
	21st to end	Day	9% 16% 5% 12% 9% 6% 8% 5% 5% 6% 19%	1570
March	1st to 10th	Day	12% 16% 4 11% 6% 5% 6% 5% 5% 4 26%	3116
	11th to 20th	Day	13% 21% 8% 13% 7% 7% 5% 3 4 4 16%	3315
	21st to end	Day	12% 18% 7% 13% 5% 6% 3 3 4 5% 24%	4062
April	1st to 10th	Day	16% 19% 5% 11% 6% 4 4 3 4 5% 21%	2280
	11th to 20th	Day	15% 15% 4 9% 5% 4 5% 4 5% 6% 28%	2392
	21st to end	Day	20% 14% 4 8% 5% 4 4 3 4 5% 29%	2470
May	1st to 10th	Day	16% 14% 4 9% 6% 5% 5% 4 6% 6% 26%	4379
	11th to 20th	Day	17% 9% 3 9% 6% 5% 5% 5% 6% 7% 29%	4459
	21st to end	Day	18% 11% 3 7% 5% 5% 5% 4 6% 8% 28%	5185
June	1st to 10th	Day	22% 9% 3 8% 6% 5% 4 4 5% 6% 29%	2850
	11th to 20th	Day	17% 8% 3 8% 6% 6% 5% 5% 6% 8% 29%	2850
	21st to end	Day	24% 9% 3 8% 5% 5% 5% 3 6% 7% 26%	2850
July	1st to 10th	Day	21% 9% 3 7% 5% 5% 5% 4 6% 7% 29%	4760
	11th to 20th	Day	17% 8% 3 7% 6% 5% 5% 4 6% 9% 30%	4610
	21st to end	Day	16% 8% 3 8% 5% 5% 5% 4 7% 8% 31%	4814
August	1st to 10th	Day	17% 9% 3 8% 5% 5% 6% 5% 8% 9% 24%	4423
	11th to 20th	Day	19% 10% 3 8% 5% 5% 6% 5% 7% 7% 25%	4139
	21st to end	Day	18% 8% 3 8% 5% 5% 5% 4 5% 6% 32%	4447
September	1st to 10th	Day	23% 10% 3 9% 4 4 4 3 5% 6% 29%	2280
	11th to 20th	Day	24% 10% 3 8% 5% 4 3 3 5% 6% 30%	2123
	21st to end	Day	26% 12% 3 8% 5% 5% 4 3 3 4 26%	2090
October	1st to 10th	Day	22% 14% 4 7% 5% 4 5% 4 5% 6% 25%	2052
	11th to 20th	Day	30% 19% 5% 8% 5% 4 4 3 4 4 14%	1710
	21st to end	Day	27% 20% 5% 9% 5% 3 2 3 4 4 16%	1881
November	1st to 10th	Day	23% 20% 7% 13% 5% 4 4 2 2 3 16%	1761
	11th to 20th	Day	21% 21% 8% 13% 6% 4 4 2 3 5% 12%	1543
	21st to end	Day	20% 25% 9% 13% 6% 4 3 2 3 4 11%	1400
December	1st to 10th	Day	16% 20% 7% 17% 9% 7% 5% 3 2 2 11%	1386
	11th to 20th	Day	15% 19% 5% 16% 7% 6% 5% 3 4 3 16%	1668
	21st to end	Day	12% 18% 7% 13% 8% 7% 5% 3 5% 6% 15%	2431
January	1st to 10th	Night	9% 19% 8% 17% 8% 9% 6% 3 4 4 13%	4684
	11th to 20th	Night	11% 16% 6% 18% 10% 10% 6% 3 5% 4 12%	4440
	21st to end	Night	6% 14% 6% 14% 8% 9% 6% 5% 5% 5% 22%	4884
February	1st to 10th	Night	8% 11% 5% 14% 9% 6% 8% 5% 6% 5% 22%	2660
	11th to 20th	Night	8% 17% 7% 14% 8% 6% 7% 6% 6% 4 17%	2362
	21st to end	Night	8% 14% 7% 14% 9% 7% 6% 5% 5% 5% 21%	1884
March	1st to 10th	Night	13% 15% 4 11% 6% 6% 6% 6% 5% 5% 24%	3724
	11th to 20th	Night	15% 21% 6% 12% 7% 5% 5% 4 5% 5% 15%	3644
	21st to end	Night	10% 18% 6% 15% 6% 5% 4 3 4 5% 26%	3567
April	1st to 10th	Night	18% 16% 5% 9% 7% 5% 5% 3 2 5% 25%	1900
	11th to 20th	Night	17% 13% 4 8% 5% 4 4 3 5% 6% 30%	1736
	21st to end	Night	19% 12% 4 8% 5% 5% 4 4 4 6% 30%	1710
May	1st to 10th	Night	16% 12% 5% 10% 5% 4 5% 3 4 6% 30%	2592
	11th to 20th	Night	18% 9% 3 7% 5% 4 5% 3 4 7% 35%	2434
	21st to end	Night	21% 9% 2 7% 5% 4 5% 3 5% 7% 30%	2401
June	1st to 10th	Night	19% 9% 4 6% 6% 5% 4 5% 7% 6% 30%	1330
	11th to 20th	Night	16% 10% 3 8% 6% 5% 4 5% 5% 7% 32%	1330
	21st to end	Night	18% 11% 3 7% 5% 4 5% 4 5% 6% 30%	1330
July	1st to 10th	Night	16% 7% 3 8% 6% 6% 5% 4 7% 7% 29%	2210
	11th to 20th	Night	13% 8% 3 9% 6% 6% 5% 5% 8% 9% 29%	2351
	21st to end	Night	13% 6% 3 6% 3 5% 5% 4 7% 10% 38%	2739
August	1st to 10th	Night	16% 8% 3 8% 5% 5% 6% 4 6% 8% 30%	2506
	11th to 20th	Night	17% 8% 4 7% 6% 5% 5% 5% 6% 9% 29%	2657
	21st to end	Night	14% 6% 3 7% 6% 4 5% 4 6% 7% 38%	3206
September	1st to 10th	Night	20% 8% 3 8% 5% 4 4 3 5% 6% 36%	1900
	11th to 20th	Night	22% 9% 3 6% 5% 4 5% 4 5% 6% 32%	2057
	21st to end	Night	22% 9% 3 7% 5% 4 4 3 4 6% 34%	2090
October	1st to 10th	Night	20% 11% 3 7% 5% 4 4 3 5% 6% 32%	2125
	11th to 20th	Night	28% 15% 5% 8% 6% 4 4 3 4 4 21%	2470
	21st to end	Night	27% 16% 4 10% 5% 4 4 3 5% 4 17%	2717
November	1st to 10th	Night	24% 19% 7% 11% 6% 4 3 3 4 4 15%	2537
	11th to 20th	Night	18% 19% 7% 14% 6% 4 4 3 4 4 16%	2854
	21st to end	Night	19% 22% 8% 16% 6% 5% 4 3 3 3 11%	3000
December	1st to 10th	Night	16% 18% 7% 14% 9% 6% 4 3 4 4 12%	2977
	11th to 20th	Night	17% 18% 5% 15% 8% 6% 5% 4 4 4 13%	3531
	21st to end	Night	13% 21% 8% 14% 7% 5% 4 3 4 5% 16%	5236

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	73% 5% 9% 11% 3	2253
	11th to 20th	Day	80% 4 6% 6% 4	2520
	21st to end	Day	59% 5% 6% 18% 11% 1	2772
February	1st to 10th	Day	63% 5% 7% 13% 10% 1	1520
	11th to 20th	Day	69% 6% 8% 11% 6%	1709
	21st to end	Day	63% 5% 9% 15% 8% 1	1570
March	1st to 10th	Day	60% 5% 9% 17% 9%	3119
	11th to 20th	Day	72% 6% 6% 10% 6%	3315
	21st to end	Day	64% 3 9% 13% 9% 2	4062
April	1st to 10th	Day	67% 5% 7% 12% 9% 1	2280
	11th to 20th	Day	56% 6% 10% 19% 9% 1	2392
	21st to end	Day	58% 5% 8% 16% 12% 1	2470
May	1st to 10th	Day	54% 11% 11% 14% 10% 1	4393
	11th to 20th	Day	50% 10% 10% 20% 9% 1	4463
	21st to end	Day	52% 7% 11% 19% 10% 1	5185
June	1st to 10th	Day	55% 6% 9% 16% 13% 1	2850
	11th to 20th	Day	52% 6% 12% 18% 10% 2	2850
	21st to end	Day	57% 7% 11% 16% 9%	2850
July	1st to 10th	Day	51% 7% 12% 26% 4	4685
	11th to 20th	Day	49% 8% 18% 19% 6%	4529
	21st to end	Day	49% 8% 18% 21% 5%	4661
August	1st to 10th	Day	52% 8% 18% 19% 3	4409
	11th to 20th	Day	56% 8% 18% 15% 3	4181
	21st to end	Day	52% 7% 13% 20% 8%	4447
September	1st to 10th	Day	55% 7% 14% 19% 6%	2280
	11th to 20th	Day	55% 7% 15% 18% 4	2123
	21st to end	Day	61% 7% 11% 16% 5%	2090
October	1st to 10th	Day	60% 6% 12% 18% 4 1	3403
	11th to 20th	Day	73% 5% 10% 11% 1	2822
	21st to end	Day	70% 6% 13% 8% 3	3081
November	1st to 10th	Day	75% 4 10% 7% 3	1761
	11th to 20th	Day	77% 5% 8% 8% 2	1543
	21st to end	Day	79% 5% 8% 7% 1	1400
December	1st to 10th	Day	81% 4 7% 6% 1	1386
	11th to 20th	Day	72% 5% 7% 12% 4	1668
	21st to end	Day	68% 7% 7% 9% 7% 1	2431
January	1st to 10th	Night	74% 4 8% 11% 3	4684
	11th to 20th	Night	76% 3 8% 9% 3	4440
	21st to end	Night	61% 6% 8% 17% 7%	4884
February	1st to 10th	Night	62% 4 10% 15% 9%	2660
	11th to 20th	Night	66% 6% 10% 13% 5%	2365
	21st to end	Night	63% 6% 9% 16% 6%	1884
March	1st to 10th	Night	61% 5% 11% 16% 7% 1	3734
	11th to 20th	Night	71% 6% 7% 9% 6% 1	3645
	21st to end	Night	61% 5% 7% 17% 9% 1	3567
April	1st to 10th	Night	64% 4 7% 14% 8% 2	1900
	11th to 20th	Night	54% 5% 10% 18% 12% 1	1736
	21st to end	Night	55% 6% 8% 18% 10% 2	1710
May	1st to 10th	Night	52% 9% 12% 15% 12%	2598
	11th to 20th	Night	46% 9% 10% 24% 11% 1	2435
	21st to end	Night	52% 6% 9% 22% 11%	2402
June	1st to 10th	Night	51% 7% 12% 18% 11% 2	1330
	11th to 20th	Night	52% 8% 11% 16% 12% 2	1330
	21st to end	Night	52% 9% 10% 19% 10%	1330
July	1st to 10th	Night	52% 8% 11% 24% 5%	2175
	11th to 20th	Night	47% 10% 17% 20% 6%	2309
	21st to end	Night	40% 9% 20% 25% 6%	2651
August	1st to 10th	Night	50% 9% 20% 19% 2	2496
	11th to 20th	Night	51% 9% 23% 15% 2	2681
	21st to end	Night	44% 8% 16% 25% 7%	3206
September	1st to 10th	Night	49% 8% 16% 20% 7%	1900
	11th to 20th	Night	53% 7% 17% 16% 5%	2057
	21st to end	Night	52% 7% 13% 22% 6%	2090
October	1st to 10th	Night	56% 5% 13% 21% 4 1	3554
	11th to 20th	Night	65% 6% 10% 17% 2	4097
	21st to end	Night	71% 7% 11% 9% 2 1	4467
November	1st to 10th	Night	73% 5% 10% 8% 3	2537
	11th to 20th	Night	73% 5% 9% 9% 3	2854
	21st to end	Night	80% 5% 7% 6% 1	3000
December	1st to 10th	Night	76% 5% 9% 9% 1	2977
	11th to 20th	Night	74% 5% 7% 10% 4	3532
	21st to end	Night	71% 5% 8% 10% 5% 1	5236

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	17% 12% 40% 23% 7% 1	180
	11th to 20th	Day	17% 16% 36% 19% 9% 3	180
	21st to end	Day	16% 14% 32% 24% 12% 3	198
February	1st to 10th	Day	13% 18% 38% 23% 6% 2	180
	11th to 20th	Day	18% 20% 34% 19% 8%	350
	21st to end	Day	21% 20% 36% 15% 7% 1	382
March	1st to 10th	Day	21% 16% 33% 19% 10% 1	460
	11th to 20th	Day	22% 16% 32% 19% 9% 2	460
	21st to end	Day	24% 18% 32% 20% 6% 2	506
April	1st to 10th	Day	25% 18% 30% 18% 7% 2	460
	11th to 20th	Day	24% 17% 29% 20% 7% 3	452
	21st to end	Day	25% 18% 34% 14% 7% 2	460
May	1st to 10th	Day	28% 14% 27% 21% 9% 1	463
	11th to 20th	Day	18% 17% 32% 22% 11% 2	522
	21st to end	Day	28% 19% 29% 17% 6%	735
June	1st to 10th	Day	28% 12% 30% 22% 7% 1	680
	11th to 20th	Day	20% 17% 28% 23% 11% 2	680
	21st to end	Day	26% 10% 30% 21% 11% 1	680
July	1st to 10th	Day	23% 11% 31% 24% 10% 1	670
	11th to 20th	Day	24% 8% 28% 26% 11% 2	583
	21st to end	Day	23% 14% 25% 26% 11% 2	532
August	1st to 10th	Day	27% 9% 29% 22% 10% 3	486
	11th to 20th	Day	21% 11% 27% 23% 15% 4	479
	21st to end	Day	25% 12% 28% 17% 12% 5%	539
September	1st to 10th	Day	27% 15% 30% 16% 9% 3	490
	11th to 20th	Day	27% 13% 27% 20% 10% 3	490
	21st to end	Day	26% 17% 25% 19% 10% 3	490
October	1st to 10th	Day	26% 17% 28% 17% 8% 4	487
	11th to 20th	Day	39% 20% 22% 11% 6% 2	390
	21st to end	Day	38% 18% 23% 14% 7% 1	429
November	1st to 10th	Day	34% 20% 32% 9% 4 1	395
	11th to 20th	Day	30% 19% 27% 17% 6% 1	288
	21st to end	Day	33% 20% 34% 10% 3 1	200
December	1st to 10th	Day	23% 11% 28% 23% 10% 5%	196
	11th to 20th	Day	25% 20% 31% 14% 7% 2	180
	21st to end	Day	20% 22% 30% 20% 7% 1	198
January	1st to 10th	Night	18% 15% 36% 25% 6%	832
	11th to 20th	Night	20% 16% 32% 23% 9% 1	760
	21st to end	Night	14% 10% 33% 32% 11% 1	836
February	1st to 10th	Night	11% 14% 35% 29% 10% 1	760
	11th to 20th	Night	16% 15% 33% 26% 8% 1	743
	21st to end	Night	14% 18% 31% 27% 8% 1	628
March	1st to 10th	Night	15% 14% 36% 26% 8% 1	760
	11th to 20th	Night	21% 17% 28% 24% 9% 1	760
	21st to end	Night	20% 16% 31% 26% 6% 1	836
April	1st to 10th	Night	26% 13% 28% 26% 7%	760
	11th to 20th	Night	24% 12% 30% 25% 7% 1	612
	21st to end	Night	23% 13% 33% 24% 7% 1	570
May	1st to 10th	Night	26% 10% 28% 27% 9%	432
	11th to 20th	Night	23% 9% 32% 26% 9% 1	374
	21st to end	Night	27% 14% 29% 25% 6%	411
June	1st to 10th	Night	22% 8% 32% 28% 9% 1	380
	11th to 20th	Night	19% 11% 29% 29% 12% 1	380
	21st to end	Night	21% 9% 25% 35% 9% 1	380
July	1st to 10th	Night	23% 5% 29% 32% 10%	370
	11th to 20th	Night	18% 7% 28% 31% 16%	368
	21st to end	Night	21% 7% 23% 35% 13% 1	416
August	1st to 10th	Night	26% 5% 20% 33% 15% 1	378
	11th to 20th	Night	23% 5% 26% 29% 16% 1	485
	21st to end	Night	24% 7% 23% 28% 15% 2	670
September	1st to 10th	Night	24% 11% 27% 25% 12% 1	760
	11th to 20th	Night	29% 11% 24% 25% 9% 2	760
	21st to end	Night	28% 11% 26% 25% 9% 1	760
October	1st to 10th	Night	29% 12% 30% 20% 8% 1	760
	11th to 20th	Night	38% 13% 21% 20% 7% 1	760
	21st to end	Night	37% 14% 23% 19% 7%	836
November	1st to 10th	Night	37% 16% 27% 16% 4 1	780
	11th to 20th	Night	27% 19% 26% 21% 7% 1	873
	21st to end	Night	31% 17% 30% 17% 6%	900
December	1st to 10th	Night	25% 16% 27% 22% 9% 2	893
	11th to 20th	Night	25% 18% 28% 20% 8% 1	850
	21st to end	Night	25% 17% 25% 23% 8% 2	935

Page generated at 2024-12-06 03:54:51. Version ac07

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