Camrose
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camrose clear sky chart from 2005-11-06 to 2026-08-30.

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 8% 5% 5% 5% 4 7% 8% 36%	148942
	Night	7% 9% 4 10% 6% 5% 5% 4 6% 8% 34%	142006
Transparency	Day	43% 8% 17% 23% 8% 1	148640
	Night	45% 8% 16% 21% 9% 1	141893
Seeing	Day	13% 8% 25% 30% 19% 6%	17896
	Night	12% 6% 28% 36% 16% 2	26780

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	7% 13% 5% 12% 7% 6% 6% 4 6% 7% 26%	4125
	11th to 20th	Day	2 8% 3 10% 7% 7% 7% 5% 9% 9% 33%	4119
	21st to end	Day	5% 10% 4 10% 6% 5% 5% 4 7% 8% 35%	4861
February	1st to 10th	Day	7% 14% 6% 10% 9% 5% 4 4 6% 9% 26%	1680
	11th to 20th	Day	6% 11% 5% 12% 7% 6% 7% 6% 7% 6% 28%	1827
	21st to end	Day	4 12% 5% 12% 8% 5% 7% 6% 7% 8% 27%	1594
March	1st to 10th	Day	3 9% 4 12% 8% 6% 5% 4 7% 9% 32%	4634
	11th to 20th	Day	7% 11% 5% 11% 6% 5% 4 3 5% 8% 34%	5109
	21st to end	Day	9% 14% 6% 15% 5% 5% 4 4 5% 7% 25%	5607
April	1st to 10th	Day	8% 13% 4 9% 7% 5% 5% 4 6% 7% 31%	2642
	11th to 20th	Day	12% 12% 4 8% 6% 4 5% 4 7% 8% 30%	2700
	21st to end	Day	12% 9% 3 9% 5% 5% 5% 4 7% 8% 32%	2730
May	1st to 10th	Day	10% 7% 2 7% 5% 5% 5% 4 7% 8% 41%	8477
	11th to 20th	Day	14% 11% 4 8% 6% 6% 6% 5% 7% 8% 26%	8755
	21st to end	Day	11% 7% 3 8% 6% 5% 6% 4 6% 7% 37%	9649
June	1st to 10th	Day	16% 7% 3 8% 5% 5% 6% 4 7% 8% 32%	3150
	11th to 20th	Day	18% 9% 2 8% 7% 6% 5% 5% 6% 9% 24%	3150
	21st to end	Day	11% 6% 2 6% 6% 5% 5% 5% 7% 9% 38%	3150
July	1st to 10th	Day	7% 5% 2 6% 4 4 5% 4 7% 9% 47%	8820
	11th to 20th	Day	10% 6% 2 7% 5% 5% 5% 4 7% 9% 41%	8820
	21st to end	Day	8% 5% 2 6% 4 5% 5% 4 6% 8% 46%	9569
August	1st to 10th	Day	11% 5% 2 6% 5% 5% 5% 4 8% 8% 41%	4824
	11th to 20th	Day	7% 5% 2 6% 5% 5% 5% 4 8% 11% 42%	4355
	21st to end	Day	9% 5% 2 6% 4 4 5% 4 6% 9% 46%	4782
September	1st to 10th	Day	10% 5% 2 6% 4 4 5% 4 6% 7% 46%	2541
	11th to 20th	Day	15% 7% 2 5% 4 4 3 3 6% 7% 44%	2200
	21st to end	Day	8% 6% 2 6% 5% 4 4 4 7% 8% 46%	2200
October	1st to 10th	Day	7% 9% 3 8% 5% 5% 5% 3 6% 7% 42%	3369
	11th to 20th	Day	8% 8% 4 7% 4 5% 6% 5% 6% 10% 39%	3038
	21st to end	Day	7% 9% 3 8% 5% 5% 5% 4 6% 8% 39%	3136
November	1st to 10th	Day	9% 15% 5% 10% 6% 5% 6% 4 6% 7% 27%	1648
	11th to 20th	Day	5% 12% 5% 13% 7% 5% 6% 4 5% 7% 32%	1564
	21st to end	Day	6% 11% 5% 14% 6% 6% 5% 4 5% 8% 30%	1470
December	1st to 10th	Day	10% 15% 5% 11% 7% 7% 5% 4 6% 8% 22%	2360
	11th to 20th	Day	8% 12% 4 13% 8% 6% 7% 5% 7% 7% 21%	2712
	21st to end	Day	4 7% 3 9% 7% 6% 5% 4 6% 6% 44%	3575
January	1st to 10th	Night	7% 11% 5% 13% 8% 8% 7% 5% 7% 7% 22%	8768
	11th to 20th	Night	2 8% 3 10% 8% 6% 5% 5% 6% 8% 40%	8779
	21st to end	Night	6% 10% 4 11% 6% 5% 5% 4 7% 9% 33%	9375
February	1st to 10th	Night	5% 10% 5% 13% 8% 7% 6% 5% 6% 7% 28%	2940
	11th to 20th	Night	6% 12% 5% 9% 6% 7% 6% 6% 6% 8% 30%	2679
	21st to end	Night	4 12% 4 10% 7% 6% 6% 5% 6% 8% 31%	2212
March	1st to 10th	Night	4 9% 5% 12% 6% 5% 6% 6% 8% 10% 28%	5480
	11th to 20th	Night	4 10% 5% 11% 8% 6% 6% 5% 8% 8% 30%	5110
	21st to end	Night	10% 14% 6% 15% 7% 5% 5% 4 6% 6% 22%	5610
April	1st to 10th	Night	6% 10% 3 10% 6% 5% 6% 4 6% 8% 34%	1975
	11th to 20th	Night	10% 12% 4 9% 6% 7% 6% 4 7% 7% 27%	1871
	21st to end	Night	11% 10% 3 8% 6% 5% 5% 4 5% 8% 34%	1890
May	1st to 10th	Night	13% 7% 3 6% 4 4 4 4 6% 7% 42%	4450
	11th to 20th	Night	12% 10% 4 10% 6% 6% 6% 5% 7% 8% 26%	4105
	21st to end	Night	11% 7% 3 8% 5% 5% 6% 5% 7% 9% 33%	4522
June	1st to 10th	Night	14% 9% 3 9% 6% 4 5% 5% 6% 8% 30%	1470
	11th to 20th	Night	15% 9% 4 10% 7% 6% 7% 6% 7% 6% 22%	1470
	21st to end	Night	9% 5% 3 6% 6% 7% 6% 6% 7% 9% 37%	1470
July	1st to 10th	Night	6% 4 2 5% 4 4 5% 4 8% 10% 47%	4140
	11th to 20th	Night	10% 6% 2 6% 4 5% 4 4 7% 9% 43%	4140
	21st to end	Night	8% 5% 2 6% 5% 4 5% 4 7% 10% 45%	4499
August	1st to 10th	Night	14% 6% 2 6% 4 4 5% 4 5% 8% 41%	2543
	11th to 20th	Night	8% 7% 3 7% 5% 5% 5% 3 8% 10% 40%	2922
	21st to end	Night	9% 5% 2 6% 4 5% 5% 5% 6% 9% 44%	3326
September	1st to 10th	Night	11% 4 2 6% 5% 4 4 4 6% 7% 46%	1857
	11th to 20th	Night	14% 6% 2 5% 3 4 4 3 5% 7% 47%	2200
	21st to end	Night	9% 8% 2 6% 4 4 5% 3 6% 8% 45%	2200
October	1st to 10th	Night	8% 7% 3 7% 5% 5% 5% 4 6% 9% 41%	3824
	11th to 20th	Night	7% 8% 3 6% 4 4 5% 4 6% 9% 42%	4110
	21st to end	Night	6% 9% 3 9% 6% 5% 5% 5% 7% 8% 37%	4631
November	1st to 10th	Night	11% 15% 5% 9% 6% 5% 5% 3 6% 6% 29%	2870
	11th to 20th	Night	6% 13% 5% 11% 7% 6% 6% 5% 6% 7% 28%	3055
	21st to end	Night	5% 11% 5% 13% 8% 5% 6% 4 6% 8% 29%	3150
December	1st to 10th	Night	10% 16% 5% 13% 7% 5% 5% 4 5% 7% 22%	5040
	11th to 20th	Night	6% 14% 6% 14% 8% 7% 6% 5% 7% 8% 20%	5700
	21st to end	Night	3 6% 4 9% 6% 6% 5% 4 6% 8% 42%	7623

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	56% 6% 10% 17% 11%	4125
	11th to 20th	Day	44% 6% 15% 15% 19% 1	4140
	21st to end	Day	45% 7% 20% 23% 5%	4862
February	1st to 10th	Day	53% 6% 15% 16% 9% 1	1680
	11th to 20th	Day	52% 8% 13% 17% 10%	1836
	21st to end	Day	52% 8% 12% 20% 8% 1	1594
March	1st to 10th	Day	46% 7% 19% 19% 8%	4634
	11th to 20th	Day	47% 7% 15% 20% 10%	5110
	21st to end	Day	57% 7% 9% 21% 6%	5607
April	1st to 10th	Day	49% 8% 16% 18% 8% 1	2642
	11th to 20th	Day	49% 7% 15% 19% 8% 1	2700
	21st to end	Day	47% 8% 14% 22% 7% 2	2730
May	1st to 10th	Day	38% 7% 12% 29% 13% 1	8477
	11th to 20th	Day	51% 8% 11% 23% 7%	8759
	21st to end	Day	41% 10% 18% 21% 9% 1	9650
June	1st to 10th	Day	46% 10% 13% 21% 10% 1	3150
	11th to 20th	Day	55% 10% 14% 17% 4 1	3150
	21st to end	Day	39% 11% 22% 21% 6% 1	3150
July	1st to 10th	Day	31% 8% 23% 29% 9% 1	8746
	11th to 20th	Day	36% 9% 18% 25% 11% 1	8739
	21st to end	Day	32% 8% 22% 28% 9%	9362
August	1st to 10th	Day	36% 10% 19% 31% 4	4806
	11th to 20th	Day	33% 10% 24% 28% 5%	4395
	21st to end	Day	32% 8% 26% 28% 6% 1	4781
September	1st to 10th	Day	35% 8% 20% 26% 9% 2	2541
	11th to 20th	Day	38% 6% 18% 30% 8% 1	2200
	21st to end	Day	34% 8% 19% 28% 8% 2	2200
October	1st to 10th	Day	39% 7% 21% 26% 6%	3369
	11th to 20th	Day	39% 7% 16% 27% 10%	3038
	21st to end	Day	41% 7% 17% 29% 5%	3136
November	1st to 10th	Day	54% 8% 15% 16% 7% 1	1648
	11th to 20th	Day	50% 8% 16% 19% 6%	1564
	21st to end	Day	51% 7% 15% 20% 6% 1	1470
December	1st to 10th	Day	60% 7% 17% 11% 4 1	2360
	11th to 20th	Day	57% 9% 17% 13% 4	2714
	21st to end	Day	38% 6% 12% 27% 15% 2	3575
January	1st to 10th	Night	57% 7% 13% 13% 10% 1	8769
	11th to 20th	Night	42% 6% 17% 18% 16% 1	8820
	21st to end	Night	46% 7% 19% 21% 7%	9375
February	1st to 10th	Night	52% 6% 14% 18% 9% 1	2940
	11th to 20th	Night	50% 7% 13% 17% 12% 1	2680
	21st to end	Night	47% 8% 12% 22% 10% 1	2212
March	1st to 10th	Night	45% 9% 18% 21% 7%	5480
	11th to 20th	Night	46% 8% 16% 20% 9% 1	5110
	21st to end	Night	58% 9% 10% 16% 7%	5610
April	1st to 10th	Night	45% 10% 13% 19% 13% 1	1975
	11th to 20th	Night	52% 8% 11% 19% 8% 2	1871
	21st to end	Night	46% 8% 11% 21% 12% 1	1890
May	1st to 10th	Night	40% 5% 9% 28% 15% 2	4449
	11th to 20th	Night	50% 10% 13% 20% 7% 1	4105
	21st to end	Night	42% 10% 17% 22% 8% 1	4526
June	1st to 10th	Night	49% 9% 13% 20% 8% 1	1470
	11th to 20th	Night	55% 11% 13% 16% 5%	1470
	21st to end	Night	39% 11% 21% 24% 5% 1	1470
July	1st to 10th	Night	28% 10% 26% 25% 10%	4105
	11th to 20th	Night	35% 9% 17% 29% 9% 2	4098
	21st to end	Night	31% 9% 23% 28% 9%	4401
August	1st to 10th	Night	39% 10% 19% 29% 3	2536
	11th to 20th	Night	36% 9% 24% 23% 7%	2948
	21st to end	Night	34% 9% 20% 30% 7%	3326
September	1st to 10th	Night	34% 8% 18% 26% 11% 3	1857
	11th to 20th	Night	36% 6% 16% 31% 9% 3	2200
	21st to end	Night	36% 8% 15% 25% 14% 2	2200
October	1st to 10th	Night	38% 6% 21% 27% 8% 1	3824
	11th to 20th	Night	37% 6% 14% 33% 9% 1	4110
	21st to end	Night	41% 8% 20% 25% 6%	4631
November	1st to 10th	Night	53% 8% 11% 20% 6% 1	2870
	11th to 20th	Night	52% 8% 14% 18% 7% 1	3055
	21st to end	Night	51% 8% 16% 17% 6% 1	3150
December	1st to 10th	Night	62% 7% 14% 12% 5% 1	5040
	11th to 20th	Night	59% 9% 16% 11% 5%	5697
	21st to end	Night	38% 6% 15% 23% 16% 2	7623

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	11% 5% 30% 31% 18% 5%	220
	11th to 20th	Day	10% 10% 33% 32% 14% 2	220
	21st to end	Day	8% 11% 29% 32% 17% 4	242
February	1st to 10th	Day	13% 9% 28% 34% 12% 4	220
	11th to 20th	Day	11% 8% 30% 31% 17% 3	322
	21st to end	Day	6% 8% 28% 35% 17% 5%	310
March	1st to 10th	Day	10% 7% 29% 33% 17% 4	540
	11th to 20th	Day	11% 5% 31% 31% 15% 6%	540
	21st to end	Day	14% 5% 28% 30% 20% 4	594
April	1st to 10th	Day	9% 12% 28% 32% 16% 4	540
	11th to 20th	Day	15% 11% 26% 27% 18% 4	532
	21st to end	Day	17% 10% 23% 31% 15% 4	540
May	1st to 10th	Day	13% 9% 26% 32% 15% 5%	720
	11th to 20th	Day	12% 7% 25% 32% 17% 7%	775
	21st to end	Day	16% 5% 23% 28% 20% 8%	844
June	1st to 10th	Day	18% 11% 23% 31% 13% 4	780
	11th to 20th	Day	18% 9% 24% 24% 18% 7%	780
	21st to end	Day	13% 5% 21% 28% 24% 9%	780
July	1st to 10th	Day	11% 5% 17% 33% 26% 9%	771
	11th to 20th	Day	12% 5% 20% 29% 26% 8%	768
	21st to end	Day	10% 5% 16% 33% 26% 10%	849
August	1st to 10th	Day	11% 5% 18% 30% 23% 12%	658
	11th to 20th	Day	9% 6% 22% 33% 24% 7%	557
	21st to end	Day	11% 6% 18% 32% 23% 10%	620
September	1st to 10th	Day	13% 6% 28% 27% 18% 8%	530
	11th to 20th	Day	18% 5% 22% 31% 19% 5%	530
	21st to end	Day	12% 14% 30% 27% 12% 5%	530
October	1st to 10th	Day	16% 8% 28% 28% 16% 4	390
	11th to 20th	Day	11% 8% 33% 30% 15% 2	330
	21st to end	Day	13% 14% 34% 24% 12% 2	363
November	1st to 10th	Day	18% 8% 30% 28% 13% 2	330
	11th to 20th	Day	9% 8% 39% 32% 12% 1	269
	21st to end	Day	6% 7% 31% 37% 11% 7%	220
December	1st to 10th	Day	10% 8% 31% 31% 14% 5%	220
	11th to 20th	Day	10% 11% 27% 36% 14% 2	220
	21st to end	Day	11% 5% 24% 38% 19% 3	242
January	1st to 10th	Night	10% 8% 31% 35% 13% 2	1050
	11th to 20th	Night	10% 10% 34% 36% 9% 2	1050
	21st to end	Night	13% 11% 33% 30% 11% 2	1060
February	1st to 10th	Night	9% 7% 26% 38% 17% 2	840
	11th to 20th	Night	9% 6% 31% 37% 15% 1	824
	21st to end	Night	8% 5% 27% 37% 19% 4	692
March	1st to 10th	Night	10% 6% 27% 39% 16% 2	840
	11th to 20th	Night	10% 4 32% 36% 15% 3	840
	21st to end	Night	14% 6% 27% 36% 15% 3	924
April	1st to 10th	Night	10% 7% 28% 35% 18% 2	715
	11th to 20th	Night	13% 7% 30% 36% 12% 1	623
	21st to end	Night	16% 8% 23% 36% 16% 1	630
May	1st to 10th	Night	16% 7% 24% 34% 17% 2	504
	11th to 20th	Night	13% 4 23% 40% 19% 1	414
	21st to end	Night	18% 6% 23% 33% 18% 3	455
June	1st to 10th	Night	19% 7% 26% 30% 15% 3	420
	11th to 20th	Night	19% 6% 25% 31% 16% 2	420
	21st to end	Night	12% 3 20% 38% 23% 4	420
July	1st to 10th	Night	12% 4 17% 42% 24% 1	410
	11th to 20th	Night	11% 5% 19% 46% 18% 1	408
	21st to end	Night	10% 3 16% 43% 25% 3	460
August	1st to 10th	Night	13% 4 16% 35% 28% 4	418
	11th to 20th	Night	11% 4 18% 38% 27% 2	579
	21st to end	Night	10% 4 20% 42% 24% 1	687
September	1st to 10th	Night	13% 2 20% 42% 21% 2	618
	11th to 20th	Night	16% 4 20% 41% 18% 2	800
	21st to end	Night	13% 5% 30% 37% 14% 2	800
October	1st to 10th	Night	14% 5% 27% 38% 15% 1	800
	11th to 20th	Night	13% 5% 34% 34% 14% 1	800
	21st to end	Night	12% 8% 33% 36% 11%	899
November	1st to 10th	Night	18% 7% 31% 32% 10% 1	1025
	11th to 20th	Night	12% 8% 35% 31% 12% 3	1050
	21st to end	Night	9% 6% 38% 34% 11% 2	1050
December	1st to 10th	Night	13% 8% 35% 29% 12% 3	1050
	11th to 20th	Night	11% 7% 34% 34% 11% 2	1050
	21st to end	Night	9% 4 31% 37% 16% 2	1155

Page generated at 2026-08-27 02:07:14. Version ac07

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