Hinton
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hinton 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	11% 11% 4 10% 6% 5% 5% 4 6% 7% 31%	106012
	Night	8% 11% 4 10% 6% 5% 5% 4 6% 7% 33%	102328
Transparency	Day	48% 10% 15% 18% 8% 1	105747
	Night	46% 10% 16% 19% 8% 1	102239
Seeing	Day	18% 16% 29% 23% 11% 2	16271
	Night	15% 13% 31% 28% 12% 1	24576

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	3 11% 6% 12% 9% 7% 7% 5% 7% 8% 26%	1899
	11th to 20th	Day	4 11% 4 12% 6% 4 5% 4 11% 6% 32%	2088
	21st to end	Day	5% 10% 3 10% 7% 6% 7% 5% 7% 9% 31%	2794
February	1st to 10th	Day	4 13% 6% 15% 6% 6% 6% 4 7% 7% 26%	1520
	11th to 20th	Day	4 15% 6% 12% 8% 6% 6% 4 6% 7% 27%	1533
	21st to end	Day	2 11% 6% 15% 9% 8% 5% 4 5% 7% 27%	1561
March	1st to 10th	Day	2 7% 5% 15% 10% 8% 5% 4 6% 9% 29%	3138
	11th to 20th	Day	5% 11% 4 6% 4 4 5% 5% 7% 9% 41%	3256
	21st to end	Day	3 16% 7% 20% 6% 4 5% 4 5% 7% 22%	4155
April	1st to 10th	Day	6% 15% 6% 11% 9% 6% 7% 6% 8% 7% 18%	2280
	11th to 20th	Day	7% 18% 5% 11% 7% 6% 5% 5% 6% 6% 25%	2402
	21st to end	Day	10% 16% 5% 10% 7% 6% 5% 3 6% 7% 26%	2610
May	1st to 10th	Day	14% 17% 4 10% 5% 6% 5% 4 5% 6% 25%	4420
	11th to 20th	Day	13% 14% 4 11% 7% 6% 6% 5% 6% 6% 23%	4657
	21st to end	Day	18% 14% 5% 12% 7% 6% 5% 4 5% 6% 18%	5213
June	1st to 10th	Day	21% 10% 3 8% 5% 5% 6% 4 7% 7% 24%	3040
	11th to 20th	Day	21% 12% 4 10% 7% 6% 5% 5% 5% 6% 20%	3040
	21st to end	Day	14% 9% 3 9% 7% 7% 5% 5% 7% 7% 28%	3040
July	1st to 10th	Day	17% 7% 2 7% 5% 5% 5% 4 6% 7% 37%	5060
	11th to 20th	Day	11% 5% 2 6% 5% 5% 5% 4 6% 6% 44%	5060
	21st to end	Day	13% 7% 2 7% 5% 6% 6% 5% 8% 8% 33%	4923
August	1st to 10th	Day	16% 5% 2 5% 4 4 5% 4 6% 7% 43%	4401
	11th to 20th	Day	13% 7% 3 8% 5% 5% 6% 4 7% 8% 35%	4330
	21st to end	Day	16% 8% 3 7% 5% 4 5% 5% 5% 7% 37%	4506
September	1st to 10th	Day	14% 8% 3 7% 5% 5% 5% 4 5% 8% 37%	2280
	11th to 20th	Day	14% 9% 3 6% 4 4 5% 3 6% 7% 39%	2205
	21st to end	Day	12% 10% 3 7% 6% 5% 4 3 5% 6% 39%	2090
October	1st to 10th	Day	8% 11% 3 7% 4 5% 6% 5% 7% 8% 36%	3254
	11th to 20th	Day	9% 10% 3 9% 5% 4 6% 5% 7% 9% 32%	2859
	21st to end	Day	5% 12% 4 9% 6% 4 5% 4 7% 8% 36%	3101
November	1st to 10th	Day	7% 15% 4 10% 7% 6% 6% 4 6% 6% 29%	1588
	11th to 20th	Day	4 10% 4 11% 6% 6% 5% 5% 9% 9% 33%	1400
	21st to end	Day	4 14% 4 12% 9% 5% 5% 4 9% 7% 29%	1400
December	1st to 10th	Day	6% 15% 5% 11% 9% 6% 5% 4 5% 9% 26%	1377
	11th to 20th	Day	7% 13% 5% 9% 7% 5% 6% 4 4 9% 32%	1442
	21st to end	Day	2 11% 4 12% 6% 5% 5% 3 6% 6% 41%	2090
January	1st to 10th	Night	4 11% 7% 15% 7% 5% 5% 4 6% 8% 29%	5046
	11th to 20th	Night	4 12% 3 10% 7% 6% 6% 5% 8% 8% 31%	4825
	21st to end	Night	5% 13% 5% 11% 6% 5% 5% 5% 7% 8% 31%	4862
February	1st to 10th	Night	5% 13% 5% 14% 8% 6% 5% 5% 5% 6% 29%	2660
	11th to 20th	Night	3 13% 5% 11% 8% 6% 7% 5% 7% 6% 27%	2529
	21st to end	Night	2 12% 5% 12% 8% 7% 7% 5% 6% 6% 30%	1892
March	1st to 10th	Night	1 8% 6% 13% 10% 9% 6% 4 6% 7% 29%	3736
	11th to 20th	Night	4 9% 3 7% 4 5% 6% 5% 7% 10% 40%	3722
	21st to end	Night	4 17% 8% 15% 6% 4 4 4 5% 5% 28%	3495
April	1st to 10th	Night	6% 15% 5% 11% 7% 6% 5% 5% 8% 8% 25%	1900
	11th to 20th	Night	8% 17% 5% 11% 5% 6% 5% 3 6% 7% 27%	1729
	21st to end	Night	11% 14% 5% 10% 5% 4 5% 3 6% 6% 30%	1568
May	1st to 10th	Night	16% 15% 4 7% 5% 4 5% 5% 6% 8% 25%	2540
	11th to 20th	Night	11% 13% 4 9% 6% 5% 5% 6% 6% 8% 27%	2235
	21st to end	Night	19% 13% 4 9% 5% 5% 5% 3 6% 8% 24%	2360
June	1st to 10th	Night	18% 10% 4 7% 5% 4 4 5% 5% 7% 31%	1140
	11th to 20th	Night	20% 9% 3 8% 7% 6% 6% 5% 7% 7% 21%	1140
	21st to end	Night	15% 8% 2 8% 4 5% 6% 4 8% 9% 31%	1140
July	1st to 10th	Night	16% 7% 3 6% 4 3 3 4 6% 6% 42%	1900
	11th to 20th	Night	12% 5% 2 5% 4 4 5% 5% 7% 7% 44%	1900
	21st to end	Night	12% 6% 2 6% 5% 4 5% 5% 7% 8% 41%	2622
August	1st to 10th	Night	15% 7% 2 5% 3 4 4 4 6% 6% 44%	2529
	11th to 20th	Night	17% 8% 3 7% 5% 5% 5% 3 5% 8% 34%	2497
	21st to end	Night	15% 8% 3 6% 4 5% 4 4 7% 8% 38%	3159
September	1st to 10th	Night	15% 8% 3 8% 4 4 4 4 5% 7% 39%	1900
	11th to 20th	Night	15% 10% 3 7% 4 4 4 3 6% 6% 39%	1975
	21st to end	Night	12% 8% 3 7% 4 4 5% 4 6% 7% 40%	2090
October	1st to 10th	Night	10% 13% 4 9% 6% 5% 5% 4 6% 9% 29%	3724
	11th to 20th	Night	8% 9% 4 9% 4 5% 5% 4 6% 9% 37%	4068
	21st to end	Night	6% 11% 5% 10% 6% 5% 5% 4 6% 8% 35%	4457
November	1st to 10th	Night	8% 15% 4 9% 5% 4 5% 3 7% 8% 31%	2689
	11th to 20th	Night	4 12% 4 11% 7% 5% 5% 4 6% 7% 33%	3000
	21st to end	Night	5% 13% 5% 11% 8% 6% 6% 4 7% 7% 29%	3000
December	1st to 10th	Night	4 12% 4 13% 8% 5% 6% 4 5% 6% 32%	2983
	11th to 20th	Night	5% 15% 5% 10% 7% 6% 7% 5% 6% 6% 28%	3750
	21st to end	Night	2 11% 5% 11% 6% 5% 5% 4 7% 8% 36%	5566

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	50% 11% 18% 17% 4 1	1899
	11th to 20th	Day	44% 9% 13% 12% 20% 2	2106
	21st to end	Day	39% 17% 21% 16% 7% 1	2794
February	1st to 10th	Day	56% 8% 10% 14% 10% 2	1520
	11th to 20th	Day	54% 9% 12% 15% 9% 1	1541
	21st to end	Day	54% 8% 12% 15% 9% 2	1561
March	1st to 10th	Day	47% 10% 15% 17% 11%	3138
	11th to 20th	Day	34% 11% 18% 24% 14%	3256
	21st to end	Day	56% 12% 15% 11% 5% 1	4155
April	1st to 10th	Day	57% 12% 15% 12% 3 1	2280
	11th to 20th	Day	56% 9% 12% 16% 7%	2402
	21st to end	Day	55% 11% 13% 16% 5%	2610
May	1st to 10th	Day	54% 10% 11% 16% 8%	4420
	11th to 20th	Day	51% 16% 13% 13% 6%	4661
	21st to end	Day	58% 14% 13% 10% 4 1	5214
June	1st to 10th	Day	56% 11% 12% 15% 5% 2	3040
	11th to 20th	Day	63% 10% 11% 11% 4	3040
	21st to end	Day	52% 12% 14% 14% 6% 2	3040
July	1st to 10th	Day	44% 8% 10% 17% 15% 6%	4981
	11th to 20th	Day	38% 8% 11% 26% 16% 2	4973
	21st to end	Day	43% 10% 18% 17% 11%	4767
August	1st to 10th	Day	38% 9% 15% 29% 8%	4384
	11th to 20th	Day	44% 8% 16% 23% 8%	4372
	21st to end	Day	45% 7% 21% 20% 6%	4505
September	1st to 10th	Day	44% 9% 18% 20% 7% 2	2280
	11th to 20th	Day	44% 9% 16% 21% 9% 2	2205
	21st to end	Day	44% 9% 17% 17% 11% 3	2090
October	1st to 10th	Day	43% 7% 22% 21% 8%	3254
	11th to 20th	Day	45% 9% 17% 23% 6%	2859
	21st to end	Day	44% 6% 19% 25% 5%	3101
November	1st to 10th	Day	53% 9% 14% 16% 7% 1	1588
	11th to 20th	Day	44% 11% 16% 18% 10% 1	1400
	21st to end	Day	50% 11% 18% 13% 6% 3	1400
December	1st to 10th	Day	55% 10% 11% 15% 8% 2	1377
	11th to 20th	Day	48% 9% 17% 16% 8% 1	1444
	21st to end	Day	38% 11% 13% 21% 13% 4	2090
January	1st to 10th	Night	50% 10% 12% 16% 10% 2	5046
	11th to 20th	Night	47% 9% 10% 14% 17% 3	4868
	21st to end	Night	44% 15% 19% 16% 6% 1	4862
February	1st to 10th	Night	54% 9% 12% 14% 10% 2	2660
	11th to 20th	Night	52% 10% 14% 14% 8% 1	2531
	21st to end	Night	50% 8% 13% 18% 10% 1	1892
March	1st to 10th	Night	49% 10% 15% 16% 10%	3736
	11th to 20th	Night	34% 9% 20% 24% 13%	3723
	21st to end	Night	54% 9% 14% 17% 7% 1	3495
April	1st to 10th	Night	51% 10% 17% 15% 6%	1900
	11th to 20th	Night	54% 9% 13% 17% 7% 1	1729
	21st to end	Night	50% 12% 13% 17% 6% 1	1568
May	1st to 10th	Night	52% 12% 11% 20% 5%	2540
	11th to 20th	Night	45% 15% 17% 15% 8%	2235
	21st to end	Night	51% 13% 17% 13% 5%	2360
June	1st to 10th	Night	50% 11% 15% 16% 7% 2	1140
	11th to 20th	Night	56% 13% 15% 13% 4	1140
	21st to end	Night	46% 13% 17% 17% 6% 1	1140
July	1st to 10th	Night	40% 7% 14% 21% 15% 3	1870
	11th to 20th	Night	36% 9% 17% 29% 8% 1	1864
	21st to end	Night	39% 8% 21% 22% 10% 1	2540
August	1st to 10th	Night	40% 7% 18% 33% 2	2521
	11th to 20th	Night	48% 7% 17% 22% 5%	2521
	21st to end	Night	43% 7% 22% 22% 5%	3159
September	1st to 10th	Night	42% 10% 16% 23% 7% 3	1900
	11th to 20th	Night	44% 7% 17% 23% 8% 2	1975
	21st to end	Night	39% 11% 17% 20% 10% 1	2090
October	1st to 10th	Night	50% 7% 20% 17% 6%	3724
	11th to 20th	Night	43% 6% 17% 26% 8%	4068
	21st to end	Night	46% 8% 18% 21% 6% 1	4457
November	1st to 10th	Night	48% 9% 15% 19% 8% 1	2689
	11th to 20th	Night	47% 10% 16% 17% 10% 1	3000
	21st to end	Night	50% 10% 15% 15% 8% 2	3000
December	1st to 10th	Night	51% 9% 12% 17% 9% 2	2983
	11th to 20th	Night	52% 11% 14% 16% 6% 1	3747
	21st to end	Night	40% 12% 16% 21% 9% 2	5566

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% 12% 32% 32% 9% 4	180
	11th to 20th	Day	10% 15% 38% 26% 9% 2	180
	21st to end	Day	14% 19% 37% 23% 7% 1	198
February	1st to 10th	Day	16% 22% 32% 20% 7% 3	180
	11th to 20th	Day	9% 21% 33% 26% 8% 3	233
	21st to end	Day	8% 20% 35% 27% 9% 1	378
March	1st to 10th	Day	13% 23% 33% 18% 10% 2	460
	11th to 20th	Day	14% 19% 35% 21% 8% 3	460
	21st to end	Day	17% 22% 32% 19% 9% 1	506
April	1st to 10th	Day	19% 24% 31% 20% 5% 2	460
	11th to 20th	Day	17% 20% 27% 24% 8% 4	452
	21st to end	Day	17% 21% 32% 20% 9% 2	460
May	1st to 10th	Day	21% 17% 31% 22% 8% 2	463
	11th to 20th	Day	18% 12% 27% 26% 15% 2	651
	21st to end	Day	23% 10% 24% 25% 15% 4	760
June	1st to 10th	Day	21% 20% 29% 21% 8% 1	870
	11th to 20th	Day	25% 14% 25% 22% 12% 1	870
	21st to end	Day	19% 12% 25% 24% 16% 4	870
July	1st to 10th	Day	20% 10% 27% 26% 15% 2	856
	11th to 20th	Day	18% 12% 27% 25% 15% 2	852
	21st to end	Day	15% 11% 26% 26% 17% 4	612
August	1st to 10th	Day	18% 9% 23% 31% 14% 4	487
	11th to 20th	Day	15% 17% 30% 25% 10% 3	477
	21st to end	Day	20% 16% 30% 19% 12% 2	539
September	1st to 10th	Day	20% 17% 28% 24% 8% 3	490
	11th to 20th	Day	20% 17% 28% 23% 10% 2	490
	21st to end	Day	24% 27% 22% 19% 7% 1	490
October	1st to 10th	Day	24% 16% 29% 20% 8% 3	490
	11th to 20th	Day	20% 18% 32% 20% 8% 1	317
	21st to end	Day	20% 15% 35% 19% 9% 3	330
November	1st to 10th	Day	21% 22% 31% 18% 6% 3	236
	11th to 20th	Day	18% 18% 36% 22% 6% 2	200
	21st to end	Day	13% 20% 35% 21% 8% 4	200
December	1st to 10th	Day	12% 21% 29% 21% 11% 5%	196
	11th to 20th	Day	11% 19% 33% 26% 12%	180
	21st to end	Day	10% 15% 36% 29% 8% 3	198
January	1st to 10th	Night	14% 15% 37% 25% 8% 1	1040
	11th to 20th	Night	14% 16% 38% 23% 8% 1	956
	21st to end	Night	13% 19% 36% 25% 7%	836
February	1st to 10th	Night	14% 17% 31% 25% 13% 1	760
	11th to 20th	Night	9% 16% 36% 28% 11%	744
	21st to end	Night	8% 14% 32% 30% 13% 2	628
March	1st to 10th	Night	9% 15% 31% 32% 11% 2	760
	11th to 20th	Night	9% 14% 36% 29% 11% 1	760
	21st to end	Night	12% 11% 32% 31% 13% 1	836
April	1st to 10th	Night	13% 12% 31% 31% 12% 1	760
	11th to 20th	Night	17% 11% 30% 31% 10% 1	601
	21st to end	Night	16% 12% 33% 27% 12%	428
May	1st to 10th	Night	19% 10% 20% 38% 12%	380
	11th to 20th	Night	13% 9% 22% 39% 16%	374
	21st to end	Night	22% 7% 22% 28% 19% 1	411
June	1st to 10th	Night	24% 8% 25% 29% 13% 1	380
	11th to 20th	Night	24% 7% 20% 32% 17% 1	380
	21st to end	Night	18% 8% 23% 27% 21% 3	380
July	1st to 10th	Night	19% 5% 18% 38% 20% 1	370
	11th to 20th	Night	18% 6% 21% 30% 24% 1	368
	21st to end	Night	13% 6% 18% 31% 31% 2	416
August	1st to 10th	Night	16% 3 16% 31% 30% 3	378
	11th to 20th	Night	16% 5% 18% 35% 25% 2	376
	21st to end	Night	18% 7% 23% 35% 15% 1	627
September	1st to 10th	Night	19% 8% 21% 35% 15% 1	760
	11th to 20th	Night	20% 6% 24% 33% 16% 1	760
	21st to end	Night	17% 14% 27% 29% 11% 1	760
October	1st to 10th	Night	19% 11% 29% 30% 11% 1	760
	11th to 20th	Night	17% 13% 32% 28% 9% 1	760
	21st to end	Night	15% 14% 39% 25% 7% 1	836
November	1st to 10th	Night	18% 16% 35% 23% 8%	810
	11th to 20th	Night	13% 20% 38% 24% 5%	1000
	21st to end	Night	14% 18% 38% 22% 6% 1	1000
December	1st to 10th	Night	13% 16% 40% 22% 10%	997
	11th to 20th	Night	11% 15% 37% 28% 8% 1	1040
	21st to end	Night	10% 15% 41% 25% 8% 1	1144

Page generated at 2024-12-06 01:54:46. Version ac07

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