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 2025-04-26.

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% 35%	117058
	Night	7% 10% 4 10% 6% 5% 5% 4 6% 8% 33%	120272
Transparency	Day	44% 8% 16% 23% 8% 1	116800
	Night	46% 8% 16% 21% 9% 1	120176
Seeing	Day	13% 7% 25% 31% 19% 6%	15978
	Night	12% 6% 28% 36% 16% 2	25214

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% 11% 5% 12% 8% 6% 6% 4 7% 8% 27%	3179
	11th to 20th	Day	3 10% 4 9% 7% 7% 8% 5% 9% 9% 29%	3159
	21st to end	Day	7% 11% 4 9% 6% 5% 4 4 6% 9% 36%	3747
February	1st to 10th	Day	7% 14% 6% 11% 9% 6% 4 4 6% 8% 25%	1600
	11th to 20th	Day	6% 11% 5% 12% 7% 6% 7% 6% 6% 6% 28%	1738
	21st to end	Day	4 12% 4 12% 8% 5% 7% 6% 7% 8% 28%	1520
March	1st to 10th	Day	3 9% 4 12% 8% 6% 6% 4 7% 9% 32%	4534
	11th to 20th	Day	7% 11% 5% 11% 7% 5% 4 3 5% 8% 35%	4999
	21st to end	Day	9% 14% 6% 15% 5% 5% 4 4 5% 7% 25%	5486
April	1st to 10th	Day	8% 13% 4 9% 7% 5% 5% 4 6% 7% 32%	2516
	11th to 20th	Day	12% 12% 4 9% 6% 4 5% 4 6% 8% 31%	2570
	21st to end	Day	12% 9% 3 9% 5% 5% 6% 4 7% 9% 31%	2537
May	1st to 10th	Day	16% 10% 4 10% 6% 5% 5% 4 5% 5% 30%	4570
	11th to 20th	Day	12% 11% 4 8% 6% 6% 6% 4 7% 7% 30%	4694
	21st to end	Day	13% 9% 3 9% 7% 6% 6% 4 7% 7% 29%	5161
June	1st to 10th	Day	15% 7% 3 9% 5% 5% 6% 4 7% 8% 31%	2850
	11th to 20th	Day	19% 9% 2 8% 6% 6% 5% 5% 6% 9% 25%	2850
	21st to end	Day	10% 6% 2 6% 6% 5% 6% 5% 7% 9% 38%	2850
July	1st to 10th	Day	8% 5% 2 6% 4 4 4 4 6% 8% 49%	4740
	11th to 20th	Day	9% 4 2 6% 4 5% 5% 4 6% 9% 47%	4740
	21st to end	Day	9% 6% 2 6% 4 4 4 3 6% 8% 47%	5138
August	1st to 10th	Day	11% 6% 2 6% 5% 4 4 4 8% 8% 42%	4536
	11th to 20th	Day	7% 5% 2 6% 5% 5% 5% 4 7% 11% 43%	4091
	21st to end	Day	10% 5% 2 6% 4 4 5% 4 6% 9% 45%	4521
September	1st to 10th	Day	11% 6% 2 6% 4 4 5% 4 6% 7% 45%	2414
	11th to 20th	Day	15% 7% 2 5% 4 4 3 3 6% 7% 43%	2090
	21st to end	Day	9% 6% 2 6% 4 4 4 4 7% 8% 46%	2090
October	1st to 10th	Day	7% 9% 3 8% 5% 4 5% 3 6% 7% 42%	3266
	11th to 20th	Day	9% 7% 4 7% 4 5% 6% 5% 6% 10% 38%	2945
	21st to end	Day	7% 9% 3 8% 5% 5% 5% 4 6% 8% 39%	3039
November	1st to 10th	Day	8% 16% 5% 10% 7% 5% 5% 4 6% 7% 27%	1568
	11th to 20th	Day	5% 12% 6% 13% 7% 5% 6% 4 5% 6% 31%	1490
	21st to end	Day	6% 11% 5% 14% 6% 5% 5% 4 5% 7% 31%	1400
December	1st to 10th	Day	10% 14% 5% 11% 7% 7% 5% 4 6% 8% 22%	2290
	11th to 20th	Day	9% 12% 4 13% 7% 6% 7% 5% 7% 7% 21%	2642
	21st to end	Day	4 6% 3 9% 7% 6% 5% 3 6% 6% 45%	3498
January	1st to 10th	Night	4 9% 5% 13% 9% 8% 7% 5% 7% 8% 24%	6766
	11th to 20th	Night	3 9% 4 11% 9% 7% 5% 5% 5% 7% 36%	6739
	21st to end	Night	7% 11% 5% 10% 6% 5% 4 4 6% 8% 35%	7251
February	1st to 10th	Night	5% 11% 5% 13% 8% 7% 7% 5% 5% 7% 27%	2800
	11th to 20th	Night	6% 11% 5% 9% 6% 7% 6% 6% 6% 8% 30%	2548
	21st to end	Night	4 11% 4 10% 7% 6% 6% 5% 6% 8% 32%	2110
March	1st to 10th	Night	4 9% 5% 12% 6% 5% 6% 6% 8% 11% 29%	5360
	11th to 20th	Night	4 10% 5% 11% 8% 5% 6% 5% 8% 8% 30%	5000
	21st to end	Night	10% 13% 6% 15% 7% 5% 5% 4 6% 6% 22%	5489
April	1st to 10th	Night	6% 10% 3 10% 6% 5% 6% 4 6% 8% 35%	1881
	11th to 20th	Night	10% 12% 4 9% 6% 7% 5% 4 7% 7% 28%	1781
	21st to end	Night	12% 9% 3 8% 6% 5% 5% 4 5% 8% 34%	1759
May	1st to 10th	Night	23% 10% 4 8% 4 4 4 3 6% 6% 28%	2390
	11th to 20th	Night	11% 9% 4 10% 6% 6% 7% 5% 7% 9% 28%	2199
	21st to end	Night	14% 9% 4 10% 7% 5% 6% 5% 7% 8% 27%	2414
June	1st to 10th	Night	14% 9% 2 9% 6% 5% 5% 5% 6% 8% 30%	1330
	11th to 20th	Night	15% 9% 4 10% 7% 5% 7% 6% 7% 7% 22%	1330
	21st to end	Night	8% 5% 3 7% 6% 7% 6% 6% 8% 9% 36%	1330
July	1st to 10th	Night	9% 5% 3 6% 5% 5% 5% 4 7% 8% 42%	2220
	11th to 20th	Night	7% 5% 2 6% 4 5% 5% 5% 8% 11% 42%	2220
	21st to end	Night	10% 5% 2 6% 4 4 4 3 7% 11% 44%	2414
August	1st to 10th	Night	14% 5% 2 6% 4 4 5% 4 5% 8% 42%	2391
	11th to 20th	Night	8% 7% 3 6% 5% 5% 5% 3 7% 10% 41%	2746
	21st to end	Night	10% 5% 2 6% 4 5% 5% 5% 6% 9% 43%	3146
September	1st to 10th	Night	11% 4 2 7% 5% 4 4 5% 6% 7% 45%	1764
	11th to 20th	Night	15% 6% 2 5% 3 4 4 3 5% 7% 46%	2090
	21st to end	Night	9% 8% 2 6% 4 4 5% 4 6% 8% 45%	2090
October	1st to 10th	Night	8% 7% 3 8% 5% 4 5% 4 6% 9% 41%	3707
	11th to 20th	Night	7% 9% 3 6% 4 4 5% 4 7% 9% 42%	3983
	21st to end	Night	6% 9% 3 9% 6% 5% 5% 5% 7% 8% 37%	4487
November	1st to 10th	Night	11% 15% 5% 9% 6% 5% 5% 3 6% 6% 29%	2730
	11th to 20th	Night	6% 14% 5% 11% 7% 5% 6% 4 6% 7% 28%	2909
	21st to end	Night	5% 11% 5% 13% 8% 5% 6% 4 6% 8% 29%	3000
December	1st to 10th	Night	11% 16% 5% 13% 7% 5% 5% 4 5% 7% 23%	4890
	11th to 20th	Night	6% 14% 6% 14% 8% 6% 6% 5% 7% 8% 20%	5550
	21st to end	Night	2 6% 4 9% 6% 6% 5% 4 6% 8% 43%	7458

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	53% 7% 12% 19% 8% 1	3179
	11th to 20th	Day	47% 6% 12% 13% 20% 1	3180
	21st to end	Day	44% 7% 20% 23% 6%	3747
February	1st to 10th	Day	55% 6% 14% 16% 9% 1	1600
	11th to 20th	Day	53% 9% 13% 16% 9% 1	1747
	21st to end	Day	50% 8% 12% 20% 8% 1	1520
March	1st to 10th	Day	46% 7% 19% 20% 8%	4534
	11th to 20th	Day	47% 7% 15% 21% 10%	5000
	21st to end	Day	56% 7% 9% 21% 6%	5486
April	1st to 10th	Day	48% 9% 16% 18% 9% 1	2516
	11th to 20th	Day	49% 7% 15% 20% 9% 1	2570
	21st to end	Day	46% 9% 15% 21% 7% 2	2537
May	1st to 10th	Day	53% 8% 10% 24% 6%	4570
	11th to 20th	Day	48% 10% 11% 23% 8%	4698
	21st to end	Day	46% 12% 15% 17% 9%	5162
June	1st to 10th	Day	47% 10% 14% 21% 8% 1	2850
	11th to 20th	Day	54% 10% 14% 16% 4 1	2850
	21st to end	Day	38% 12% 22% 21% 7% 1	2850
July	1st to 10th	Day	31% 9% 17% 29% 14% 1	4666
	11th to 20th	Day	31% 9% 17% 30% 13%	4659
	21st to end	Day	33% 9% 20% 26% 12%	4976
August	1st to 10th	Day	36% 10% 18% 32% 4	4518
	11th to 20th	Day	32% 10% 24% 28% 6%	4131
	21st to end	Day	33% 8% 27% 27% 5% 1	4520
September	1st to 10th	Day	36% 8% 20% 25% 9% 2	2414
	11th to 20th	Day	40% 6% 18% 29% 7%	2090
	21st to end	Day	35% 8% 19% 27% 8% 2	2090
October	1st to 10th	Day	40% 7% 22% 26% 6%	3266
	11th to 20th	Day	40% 7% 17% 27% 10%	2945
	21st to end	Day	41% 8% 17% 29% 5%	3039
November	1st to 10th	Day	54% 8% 15% 16% 6% 1	1568
	11th to 20th	Day	51% 8% 16% 19% 5%	1490
	21st to end	Day	52% 8% 16% 19% 6% 1	1400
December	1st to 10th	Day	59% 8% 17% 11% 4 1	2290
	11th to 20th	Day	57% 9% 17% 13% 4	2644
	21st to end	Day	38% 6% 12% 27% 15% 2	3498
January	1st to 10th	Night	53% 7% 15% 15% 8% 1	6766
	11th to 20th	Night	46% 6% 13% 16% 17% 1	6780
	21st to end	Night	46% 6% 18% 24% 6%	7251
February	1st to 10th	Night	53% 6% 13% 18% 9% 1	2800
	11th to 20th	Night	49% 7% 14% 18% 11% 1	2549
	21st to end	Night	46% 8% 12% 22% 10% 1	2110
March	1st to 10th	Night	45% 9% 18% 22% 7%	5360
	11th to 20th	Night	46% 8% 16% 20% 9% 1	5000
	21st to end	Night	57% 9% 10% 16% 7%	5489
April	1st to 10th	Night	44% 10% 12% 19% 14% 1	1881
	11th to 20th	Night	52% 8% 10% 19% 8% 2	1781
	21st to end	Night	46% 9% 12% 21% 11% 1	1759
May	1st to 10th	Night	56% 6% 8% 22% 7% 1	2390
	11th to 20th	Night	46% 12% 13% 20% 9% 1	2199
	21st to end	Night	50% 13% 13% 16% 8% 1	2414
June	1st to 10th	Night	49% 9% 13% 20% 7% 1	1330
	11th to 20th	Night	55% 11% 13% 16% 5%	1330
	21st to end	Night	39% 11% 21% 23% 5% 1	1330
July	1st to 10th	Night	35% 10% 17% 20% 16% 1	2185
	11th to 20th	Night	32% 10% 17% 28% 12% 1	2178
	21st to end	Night	32% 9% 22% 27% 10%	2337
August	1st to 10th	Night	38% 10% 18% 30% 3	2384
	11th to 20th	Night	36% 9% 24% 24% 8%	2772
	21st to end	Night	35% 9% 21% 29% 6%	3146
September	1st to 10th	Night	35% 9% 18% 24% 11% 3	1764
	11th to 20th	Night	37% 6% 16% 30% 8% 3	2090
	21st to end	Night	36% 8% 15% 24% 14% 3	2090
October	1st to 10th	Night	38% 6% 21% 27% 8%	3707
	11th to 20th	Night	37% 6% 15% 33% 8% 1	3983
	21st to end	Night	41% 8% 20% 24% 6%	4487
November	1st to 10th	Night	53% 8% 12% 20% 6% 1	2730
	11th to 20th	Night	53% 8% 13% 18% 7% 1	2909
	21st to end	Night	52% 8% 16% 17% 6% 1	3000
December	1st to 10th	Night	61% 7% 14% 12% 5% 1	4890
	11th to 20th	Night	59% 9% 16% 11% 5%	5547
	21st to end	Night	37% 6% 15% 23% 16% 2	7458

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	10% 6% 30% 31% 19% 6%	200
	11th to 20th	Day	10% 9% 32% 33% 15% 2	200
	21st to end	Day	9% 10% 30% 30% 16% 5%	220
February	1st to 10th	Day	13% 10% 28% 33% 13% 4	200
	11th to 20th	Day	10% 7% 31% 31% 17% 3	293
	21st to end	Day	6% 8% 27% 35% 18% 5%	284
March	1st to 10th	Day	10% 7% 28% 35% 18% 4	500
	11th to 20th	Day	11% 5% 30% 32% 16% 7%	500
	21st to end	Day	14% 5% 27% 30% 20% 4	550
April	1st to 10th	Day	8% 12% 28% 32% 16% 4	500
	11th to 20th	Day	15% 11% 25% 27% 19% 4	492
	21st to end	Day	17% 10% 24% 31% 14% 4	481
May	1st to 10th	Day	13% 9% 24% 32% 16% 6%	623
	11th to 20th	Day	10% 6% 24% 34% 18% 7%	675
	21st to end	Day	16% 5% 23% 27% 20% 8%	734
June	1st to 10th	Day	17% 10% 24% 31% 14% 4	680
	11th to 20th	Day	19% 9% 24% 24% 18% 7%	680
	21st to end	Day	12% 5% 22% 28% 24% 9%	680
July	1st to 10th	Day	11% 3 16% 33% 26% 10%	671
	11th to 20th	Day	11% 5% 19% 30% 27% 9%	668
	21st to end	Day	10% 5% 17% 32% 25% 10%	739
August	1st to 10th	Day	11% 5% 19% 29% 23% 12%	570
	11th to 20th	Day	8% 6% 22% 32% 25% 8%	477
	21st to end	Day	12% 7% 17% 32% 23% 8%	539
September	1st to 10th	Day	14% 6% 29% 27% 17% 7%	490
	11th to 20th	Day	19% 5% 23% 32% 16% 4	490
	21st to end	Day	13% 14% 29% 26% 13% 5%	490
October	1st to 10th	Day	17% 8% 29% 25% 16% 4	357
	11th to 20th	Day	11% 8% 32% 32% 15% 2	300
	21st to end	Day	14% 13% 32% 26% 13% 3	330
November	1st to 10th	Day	17% 8% 27% 30% 15% 3	300
	11th to 20th	Day	9% 7% 38% 33% 11% 1	245
	21st to end	Day	7% 8% 31% 38% 11% 7%	200
December	1st to 10th	Day	10% 9% 29% 32% 16% 6%	200
	11th to 20th	Day	10% 10% 25% 39% 15% 3	200
	21st to end	Day	9% 4 23% 40% 20% 4	220
January	1st to 10th	Night	10% 9% 31% 35% 13% 2	1000
	11th to 20th	Night	10% 9% 33% 36% 10% 2	1000
	21st to end	Night	13% 10% 33% 30% 11% 2	1010
February	1st to 10th	Night	9% 8% 25% 38% 18% 2	800
	11th to 20th	Night	9% 6% 31% 37% 16% 1	784
	21st to end	Night	7% 5% 26% 38% 20% 5%	660
March	1st to 10th	Night	10% 6% 26% 40% 17% 2	800
	11th to 20th	Night	10% 4 31% 36% 16% 3	800
	21st to end	Night	14% 5% 26% 36% 15% 3	880
April	1st to 10th	Night	10% 7% 27% 35% 19% 2	681
	11th to 20th	Night	13% 7% 30% 36% 12% 2	593
	21st to end	Night	15% 8% 23% 36% 17% 1	587
May	1st to 10th	Night	17% 7% 22% 35% 18% 2	456
	11th to 20th	Night	12% 4 23% 41% 19% 1	374
	21st to end	Night	18% 6% 24% 31% 18% 3	411
June	1st to 10th	Night	18% 6% 26% 32% 16% 3	380
	11th to 20th	Night	20% 6% 24% 31% 16% 2	380
	21st to end	Night	11% 3 21% 39% 23% 4	380
July	1st to 10th	Night	13% 4 16% 42% 24% 1	370
	11th to 20th	Night	10% 5% 18% 46% 20% 1	368
	21st to end	Night	11% 3 16% 42% 25% 3	416
August	1st to 10th	Night	12% 3 16% 35% 29% 4	378
	11th to 20th	Night	11% 4 18% 38% 28% 2	523
	21st to end	Night	11% 4 20% 41% 24% 1	627
September	1st to 10th	Night	14% 2 20% 42% 20% 2	587
	11th to 20th	Night	16% 4 21% 40% 17% 2	760
	21st to end	Night	13% 4 29% 38% 15% 2	760
October	1st to 10th	Night	15% 4 27% 38% 15% 1	760
	11th to 20th	Night	13% 5% 33% 34% 14% 1	760
	21st to end	Night	12% 7% 32% 36% 11%	854
November	1st to 10th	Night	18% 7% 31% 33% 11% 1	975
	11th to 20th	Night	12% 9% 34% 31% 12% 3	1000
	21st to end	Night	9% 6% 39% 34% 11% 2	1000
December	1st to 10th	Night	13% 8% 33% 30% 13% 3	1000
	11th to 20th	Night	11% 7% 33% 35% 12% 2	1000
	21st to end	Night	9% 4 31% 37% 16% 3	1100

Page generated at 2025-04-23 07:25:01. Version ac07

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