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 2024-10-25.

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 8% 6% 5% 5% 4 6% 8% 36%	101950
	Night	8% 9% 4 10% 6% 5% 5% 4 6% 8% 33%	96947
Transparency	Day	44% 9% 16% 23% 8% 1	101692
	Night	45% 9% 15% 21% 9% 1	96851
Seeing	Day	13% 7% 25% 31% 19% 6%	15460
	Night	12% 6% 28% 36% 16% 2	24417

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% 12% 5% 12% 9% 6% 5% 4 6% 8% 28%	2219
	11th to 20th	Day	3 10% 4 9% 6% 7% 8% 5% 10% 7% 30%	2199
	21st to end	Day	6% 12% 4 10% 7% 5% 4 4 5% 7% 36%	2607
February	1st to 10th	Day	8% 15% 6% 10% 9% 5% 3 4 6% 9% 26%	1520
	11th to 20th	Day	6% 12% 5% 12% 6% 6% 7% 6% 6% 6% 28%	1648
	21st to end	Day	4 12% 4 12% 8% 5% 7% 6% 7% 8% 27%	1446
March	1st to 10th	Day	4 12% 5% 13% 8% 6% 6% 5% 7% 8% 26%	3154
	11th to 20th	Day	6% 12% 4 7% 5% 3 4 3 5% 10% 40%	3489
	21st to end	Day	7% 14% 6% 17% 6% 5% 4 4 5% 6% 25%	3825
April	1st to 10th	Day	8% 14% 4 10% 7% 5% 5% 4 6% 7% 31%	2390
	11th to 20th	Day	12% 12% 4 9% 6% 4 5% 4 6% 8% 31%	2440
	21st to end	Day	13% 9% 3 9% 5% 5% 6% 4 7% 9% 31%	2470
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	10% 11% 4 9% 5% 4 5% 3 6% 6% 38%	1957
	11th to 20th	Day	10% 8% 4 6% 4 5% 6% 4 6% 9% 39%	1777
	21st to end	Day	8% 11% 4 9% 5% 7% 7% 5% 6% 8% 31%	1786
November	1st to 10th	Day	8% 16% 5% 10% 6% 5% 6% 4 6% 7% 26%	1488
	11th to 20th	Day	5% 12% 5% 13% 7% 5% 6% 4 5% 6% 32%	1416
	21st to end	Day	6% 11% 5% 13% 6% 5% 5% 4 5% 8% 32%	1330
December	1st to 10th	Day	6% 13% 4 12% 8% 9% 6% 4 6% 7% 25%	1330
	11th to 20th	Day	6% 9% 5% 13% 8% 6% 6% 5% 7% 8% 26%	1682
	21st to end	Day	5% 8% 3 8% 6% 6% 5% 3 5% 6% 45%	2442
January	1st to 10th	Night	4 10% 6% 13% 8% 8% 6% 5% 7% 7% 25%	4726
	11th to 20th	Night	3 8% 3 11% 11% 7% 6% 6% 6% 7% 33%	4699
	21st to end	Night	6% 12% 5% 11% 6% 5% 5% 4 6% 8% 33%	5077
February	1st to 10th	Night	5% 11% 5% 13% 8% 7% 6% 5% 5% 7% 28%	2660
	11th to 20th	Night	6% 12% 4 9% 6% 7% 5% 6% 6% 8% 30%	2418
	21st to end	Night	4 11% 4 10% 7% 6% 6% 5% 7% 8% 32%	2008
March	1st to 10th	Night	4 10% 6% 14% 7% 6% 6% 5% 7% 9% 26%	3720
	11th to 20th	Night	4 9% 4 10% 7% 5% 5% 4 7% 8% 37%	3490
	21st to end	Night	6% 12% 7% 16% 8% 6% 6% 5% 7% 8% 21%	3828
April	1st to 10th	Night	6% 10% 3 10% 6% 5% 6% 4 7% 9% 34%	1787
	11th to 20th	Night	11% 12% 4 9% 6% 7% 5% 4 7% 7% 27%	1691
	21st to end	Night	12% 10% 3 7% 6% 5% 5% 4 5% 8% 34%	1710
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	11% 8% 3 8% 5% 4 5% 3 6% 8% 39%	2223
	11th to 20th	Night	8% 9% 4 7% 5% 4 5% 3 6% 8% 40%	2403
	21st to end	Night	6% 11% 4 10% 6% 6% 5% 5% 7% 7% 33%	2656
November	1st to 10th	Night	11% 15% 5% 9% 6% 6% 5% 3 6% 6% 29%	2590
	11th to 20th	Night	7% 14% 5% 11% 7% 5% 6% 5% 6% 7% 28%	2763
	21st to end	Night	5% 11% 5% 13% 8% 5% 6% 4 6% 8% 30%	2850
December	1st to 10th	Night	8% 13% 4 12% 8% 6% 5% 4 6% 8% 28%	2850
	11th to 20th	Night	5% 12% 6% 13% 7% 6% 6% 5% 7% 9% 25%	3510
	21st to end	Night	3 7% 4 8% 6% 6% 5% 4 6% 9% 43%	5214

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% 8% 12% 19% 7% 1	2219
	11th to 20th	Day	47% 6% 13% 15% 18% 1	2220
	21st to end	Day	47% 8% 17% 23% 5%	2607
February	1st to 10th	Day	54% 6% 15% 16% 8% 1	1520
	11th to 20th	Day	53% 9% 13% 16% 8%	1657
	21st to end	Day	51% 8% 12% 20% 8%	1446
March	1st to 10th	Day	54% 7% 13% 18% 8%	3154
	11th to 20th	Day	40% 8% 20% 20% 12%	3490
	21st to end	Day	57% 8% 11% 19% 4	3825
April	1st to 10th	Day	49% 9% 16% 17% 8% 1	2390
	11th to 20th	Day	49% 7% 15% 20% 8% 1	2440
	21st to end	Day	47% 9% 15% 21% 7% 2	2470
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	46% 7% 17% 21% 9%	1957
	11th to 20th	Day	40% 8% 18% 23% 10%	1777
	21st to end	Day	47% 10% 12% 23% 8%	1786
November	1st to 10th	Day	55% 8% 15% 15% 6% 1	1488
	11th to 20th	Day	51% 8% 16% 20% 5%	1416
	21st to end	Day	50% 8% 16% 20% 6% 1	1330
December	1st to 10th	Day	58% 8% 12% 14% 7% 2	1330
	11th to 20th	Day	51% 10% 16% 17% 6%	1684
	21st to end	Day	38% 5% 11% 27% 16% 2	2442
January	1st to 10th	Night	53% 8% 15% 16% 6% 1	4726
	11th to 20th	Night	48% 7% 13% 17% 13% 1	4740
	21st to end	Night	48% 7% 16% 22% 7% 1	5077
February	1st to 10th	Night	53% 6% 13% 19% 8% 1	2660
	11th to 20th	Night	50% 7% 14% 17% 11% 1	2419
	21st to end	Night	47% 8% 12% 22% 10% 1	2008
March	1st to 10th	Night	50% 9% 13% 20% 7%	3720
	11th to 20th	Night	41% 8% 20% 20% 10% 1	3490
	21st to end	Night	55% 11% 13% 15% 5%	3828
April	1st to 10th	Night	44% 10% 13% 20% 12% 1	1787
	11th to 20th	Night	53% 8% 11% 18% 8% 2	1691
	21st to end	Night	47% 9% 12% 20% 11% 1	1710
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	42% 6% 16% 25% 10% 1	2223
	11th to 20th	Night	41% 7% 15% 28% 9% 1	2403
	21st to end	Night	46% 9% 15% 21% 8% 1	2656
November	1st to 10th	Night	53% 9% 12% 20% 6% 1	2590
	11th to 20th	Night	53% 8% 13% 18% 7% 1	2763
	21st to end	Night	51% 8% 16% 18% 6% 1	2850
December	1st to 10th	Night	54% 7% 12% 17% 8% 1	2850
	11th to 20th	Night	53% 10% 17% 15% 6%	3507
	21st to end	Night	36% 7% 16% 21% 16% 4	5214

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	9% 6% 29% 32% 18% 6%	180
	11th to 20th	Day	9% 9% 31% 33% 17% 2	180
	21st to end	Day	9% 10% 26% 33% 18% 5%	198
February	1st to 10th	Day	14% 11% 27% 33% 12% 4	180
	11th to 20th	Day	11% 8% 32% 29% 17% 4	263
	21st to end	Day	5% 8% 28% 34% 20% 6%	258
March	1st to 10th	Day	10% 7% 29% 34% 16% 4	460
	11th to 20th	Day	10% 6% 31% 31% 16% 6%	460
	21st to end	Day	14% 5% 27% 30% 20% 4	506
April	1st to 10th	Day	8% 13% 29% 32% 14% 3	460
	11th to 20th	Day	16% 9% 24% 28% 19% 4	452
	21st to end	Day	18% 10% 24% 31% 14% 3	460
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% 33% 26% 13% 2	311
November	1st to 10th	Day	18% 9% 26% 30% 14% 3	270
	11th to 20th	Day	10% 7% 38% 33% 11% 1	221
	21st to end	Day	7% 8% 32% 36% 11% 7%	180
December	1st to 10th	Day	8% 8% 29% 31% 17% 6%	180
	11th to 20th	Day	9% 9% 27% 37% 16% 2	180
	21st to end	Day	10% 5% 24% 39% 20% 3	198
January	1st to 10th	Night	10% 9% 31% 35% 13% 2	950
	11th to 20th	Night	10% 8% 32% 37% 10% 2	950
	21st to end	Night	13% 10% 32% 31% 12% 2	960
February	1st to 10th	Night	9% 8% 25% 38% 18% 2	760
	11th to 20th	Night	10% 6% 32% 35% 16% 1	744
	21st to end	Night	7% 5% 25% 38% 21% 5%	628
March	1st to 10th	Night	10% 6% 26% 38% 17% 2	760
	11th to 20th	Night	10% 4 31% 36% 16% 3	760
	21st to end	Night	13% 5% 27% 37% 15% 3	836
April	1st to 10th	Night	10% 7% 27% 33% 20% 3	647
	11th to 20th	Night	14% 7% 29% 36% 13% 2	563
	21st to end	Night	16% 8% 23% 35% 16% 1	570
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	13% 7% 33% 37% 11%	829
November	1st to 10th	Night	18% 7% 30% 33% 11% 1	925
	11th to 20th	Night	12% 9% 34% 30% 12% 3	950
	21st to end	Night	8% 6% 40% 33% 11% 2	950
December	1st to 10th	Night	13% 7% 33% 30% 14% 4	950
	11th to 20th	Night	11% 7% 33% 35% 12% 2	950
	21st to end	Night	9% 4 31% 37% 16% 3	1045

Page generated at 2024-10-22 18:21:06. Version ac07

Copyright © 2024 Attilla Danko.