Quesnel
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Quesnel clear sky chart from 2005-11-06 to 2024-02-15.

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% 10% 4 8% 7% 4 6% 6% 6% 7% 30%	77469
	Night	12% 12% 5% 9% 8% 4 6% 6% 6% 7% 27%	81551
Transparency	Day	51% 10% 16% 17% 6% 1	77166
	Night	55% 9% 13% 15% 6% 1	81434
Seeing	Day	15% 12% 25% 27% 17% 4	15124
	Night	18% 11% 21% 29% 18% 2	23330

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	9% 17% 7% 11% 11% 6% 7% 6% 6% 5% 17%	2166
	11th to 20th	Day	13% 15% 6% 9% 6% 3 6% 5% 7% 7% 24%	2199
	21st to end	Day	13% 15% 6% 11% 9% 4 6% 5% 6% 7% 17%	2474
February	1st to 10th	Day	14% 16% 6% 10% 8% 4 5% 4 5% 6% 24%	1584
	11th to 20th	Day	10% 15% 6% 9% 8% 5% 6% 6% 4 6% 24%	1612
	21st to end	Day	6% 13% 7% 11% 9% 3 6% 4 6% 6% 29%	1332
March	1st to 10th	Day	7% 14% 6% 8% 7% 4 6% 6% 5% 7% 29%	1793
	11th to 20th	Day	7% 11% 4 9% 8% 4 7% 7% 7% 9% 27%	1980
	21st to end	Day	8% 12% 5% 9% 7% 4 7% 7% 7% 6% 27%	2267
April	1st to 10th	Day	7% 12% 6% 9% 10% 6% 8% 6% 5% 7% 24%	2160
	11th to 20th	Day	9% 12% 5% 9% 8% 5% 7% 6% 7% 7% 27%	2270
	21st to end	Day	10% 10% 4 9% 8% 5% 6% 6% 6% 8% 28%	2497
May	1st to 10th	Day	11% 10% 4 9% 8% 5% 6% 5% 5% 7% 30%	2520
	11th to 20th	Day	10% 7% 4 8% 7% 5% 6% 7% 6% 7% 34%	2526
	21st to end	Day	10% 8% 4 7% 7% 4 8% 8% 7% 8% 30%	2995
June	1st to 10th	Day	12% 7% 4 7% 7% 5% 6% 6% 6% 8% 31%	2880
	11th to 20th	Day	14% 8% 4 8% 7% 5% 6% 7% 7% 8% 27%	2880
	21st to end	Day	10% 6% 3 8% 7% 5% 6% 6% 8% 9% 33%	2880
July	1st to 10th	Day	10% 7% 3 6% 6% 4 5% 6% 7% 8% 38%	2835
	11th to 20th	Day	10% 6% 3 5% 5% 4 5% 7% 7% 8% 41%	2700
	21st to end	Day	6% 4 2 5% 5% 4 6% 6% 8% 9% 45%	2938
August	1st to 10th	Day	6% 4 2 5% 5% 3 6% 6% 7% 9% 46%	2521
	11th to 20th	Day	6% 4 2 5% 6% 3 5% 5% 6% 8% 48%	2422
	21st to end	Day	11% 7% 3 8% 8% 4 6% 7% 6% 9% 31%	2556
September	1st to 10th	Day	12% 7% 2 6% 6% 4 5% 4 6% 8% 40%	2160
	11th to 20th	Day	11% 7% 4 5% 6% 4 5% 5% 5% 8% 39%	2160
	21st to end	Day	16% 9% 4 7% 7% 4 5% 5% 5% 7% 31%	1902
October	1st to 10th	Day	15% 10% 3 7% 6% 4 5% 6% 6% 7% 31%	1800
	11th to 20th	Day	14% 10% 4 8% 7% 4 5% 5% 6% 7% 30%	1798
	21st to end	Day	16% 11% 5% 8% 6% 4 6% 4 5% 7% 27%	1674
November	1st to 10th	Day	18% 13% 5% 8% 6% 3 6% 5% 6% 6% 23%	1488
	11th to 20th	Day	12% 14% 7% 9% 10% 5% 6% 5% 6% 6% 20%	1520
	21st to end	Day	13% 19% 7% 10% 10% 5% 5% 5% 5% 5% 16%	1308
December	1st to 10th	Day	15% 15% 5% 9% 9% 5% 7% 5% 7% 5% 18%	1140
	11th to 20th	Day	15% 17% 6% 9% 10% 5% 6% 7% 6% 6% 14%	1442
	21st to end	Day	8% 16% 5% 10% 7% 5% 6% 6% 6% 8% 24%	2090
January	1st to 10th	Night	10% 15% 6% 11% 9% 5% 7% 6% 5% 6% 20%	4808
	11th to 20th	Night	11% 14% 6% 9% 8% 4 5% 5% 5% 6% 27%	4699
	21st to end	Night	14% 17% 6% 11% 9% 5% 5% 5% 6% 6% 16%	5181
February	1st to 10th	Night	14% 16% 6% 10% 7% 5% 6% 5% 4 5% 22%	2594
	11th to 20th	Night	10% 15% 7% 10% 6% 4 5% 5% 5% 6% 27%	2329
	21st to end	Night	8% 14% 5% 9% 6% 3 6% 5% 6% 6% 31%	1924
March	1st to 10th	Night	8% 14% 6% 9% 7% 5% 6% 5% 5% 8% 29%	2163
	11th to 20th	Night	6% 13% 5% 9% 9% 5% 6% 6% 6% 7% 28%	1979
	21st to end	Night	8% 12% 5% 8% 8% 4 7% 7% 6% 7% 26%	2089
April	1st to 10th	Night	7% 12% 5% 9% 8% 5% 7% 7% 7% 7% 27%	1800
	11th to 20th	Night	10% 9% 5% 7% 7% 5% 8% 7% 8% 9% 25%	1637
	21st to end	Night	10% 10% 3 7% 8% 3 7% 6% 7% 6% 33%	1462
May	1st to 10th	Night	12% 11% 5% 9% 7% 4 5% 4 5% 6% 33%	1440
	11th to 20th	Night	10% 7% 4 7% 8% 5% 8% 5% 6% 8% 32%	1364
	21st to end	Night	13% 8% 4 8% 8% 4 5% 6% 8% 9% 27%	1278
June	1st to 10th	Night	15% 8% 3 7% 6% 3 7% 7% 4 7% 33%	1080
	11th to 20th	Night	18% 7% 4 8% 6% 4 6% 6% 7% 9% 25%	1080
	21st to end	Night	13% 6% 4 6% 9% 5% 6% 7% 7% 9% 28%	1080
July	1st to 10th	Night	13% 6% 2 6% 7% 4 7% 8% 8% 7% 33%	1122
	11th to 20th	Night	10% 5% 3 6% 8% 3 5% 6% 7% 8% 39%	1260
	21st to end	Night	8% 4 2 6% 6% 3 5% 5% 7% 11% 43%	1379
August	1st to 10th	Night	6% 4 2 6% 5% 4 5% 5% 7% 10% 45%	1418
	11th to 20th	Night	6% 4 2 6% 5% 3 5% 5% 7% 9% 46%	1474
	21st to end	Night	12% 7% 3 8% 9% 4 7% 6% 8% 9% 28%	1800
September	1st to 10th	Night	11% 6% 3 6% 7% 4 6% 5% 6% 8% 39%	1800
	11th to 20th	Night	11% 5% 2 7% 6% 4 5% 5% 6% 6% 43%	1800
	21st to end	Night	15% 9% 4 7% 7% 3 5% 5% 6% 7% 32%	2056
October	1st to 10th	Night	14% 7% 4 8% 7% 3 5% 5% 5% 8% 33%	2160
	11th to 20th	Night	16% 10% 3 9% 7% 5% 5% 5% 6% 8% 27%	2161
	21st to end	Night	16% 10% 4 9% 7% 4 6% 5% 5% 7% 27%	2680
November	1st to 10th	Night	17% 13% 4 9% 7% 5% 5% 5% 6% 6% 22%	2590
	11th to 20th	Night	13% 13% 5% 9% 8% 5% 6% 6% 6% 6% 23%	2660
	21st to end	Night	13% 16% 6% 11% 8% 4 6% 6% 6% 6% 18%	2848
December	1st to 10th	Night	12% 15% 5% 10% 8% 4 6% 7% 6% 6% 22%	3040
	11th to 20th	Night	15% 19% 7% 11% 8% 4 6% 5% 4 5% 15%	3750
	21st to end	Night	9% 13% 6% 10% 9% 5% 7% 6% 6% 7% 23%	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	62% 15% 10% 11% 1	2166
	11th to 20th	Day	59% 7% 15% 7% 7% 6%	2220
	21st to end	Day	65% 11% 11% 9% 3	2474
February	1st to 10th	Day	62% 6% 12% 10% 10% 1	1584
	11th to 20th	Day	61% 8% 15% 13% 3	1621
	21st to end	Day	55% 8% 14% 14% 8% 1	1332
March	1st to 10th	Day	53% 9% 12% 16% 10% 1	1793
	11th to 20th	Day	51% 11% 13% 19% 6%	1980
	21st to end	Day	55% 10% 15% 17% 4	2267
April	1st to 10th	Day	57% 9% 13% 14% 6%	2160
	11th to 20th	Day	53% 9% 12% 19% 6% 1	2270
	21st to end	Day	52% 9% 13% 19% 7%	2497
May	1st to 10th	Day	52% 9% 14% 19% 6%	2520
	11th to 20th	Day	48% 10% 13% 21% 7% 1	2529
	21st to end	Day	47% 11% 16% 19% 5%	2996
June	1st to 10th	Day	49% 10% 14% 17% 10% 1	2880
	11th to 20th	Day	52% 12% 14% 17% 5%	2880
	21st to end	Day	44% 11% 18% 21% 6% 1	2880
July	1st to 10th	Day	42% 11% 15% 24% 8% 1	2758
	11th to 20th	Day	37% 12% 21% 23% 6%	2619
	21st to end	Day	31% 12% 23% 26% 9%	2775
August	1st to 10th	Day	32% 11% 21% 30% 5%	2503
	11th to 20th	Day	32% 9% 23% 26% 9%	2422
	21st to end	Day	46% 11% 20% 18% 5%	2556
September	1st to 10th	Day	42% 10% 22% 20% 7%	2160
	11th to 20th	Day	42% 10% 18% 20% 8% 1	2160
	21st to end	Day	52% 9% 17% 16% 6%	1902
October	1st to 10th	Day	50% 10% 22% 15% 4	1800
	11th to 20th	Day	52% 9% 19% 17% 2	1798
	21st to end	Day	56% 10% 14% 15% 5%	1674
November	1st to 10th	Day	61% 9% 11% 13% 5%	1488
	11th to 20th	Day	64% 10% 11% 10% 5%	1520
	21st to end	Day	68% 11% 8% 9% 3	1308
December	1st to 10th	Day	67% 10% 10% 10% 3	1140
	11th to 20th	Day	68% 11% 10% 6% 5%	1444
	21st to end	Day	56% 10% 16% 14% 3	2090
January	1st to 10th	Night	62% 10% 13% 13% 3	4808
	11th to 20th	Night	58% 6% 12% 7% 10% 7%	4740
	21st to end	Night	68% 11% 10% 8% 3	5181
February	1st to 10th	Night	64% 7% 10% 11% 8%	2594
	11th to 20th	Night	58% 8% 15% 14% 6%	2331
	21st to end	Night	52% 8% 13% 17% 7% 2	1924
March	1st to 10th	Night	53% 9% 13% 16% 8% 2	2163
	11th to 20th	Night	53% 10% 12% 17% 8% 1	1980
	21st to end	Night	53% 10% 14% 17% 5%	2089
April	1st to 10th	Night	54% 8% 13% 17% 8%	1800
	11th to 20th	Night	51% 10% 13% 19% 7%	1637
	21st to end	Night	49% 9% 10% 22% 9% 1	1462
May	1st to 10th	Night	52% 9% 12% 19% 8%	1440
	11th to 20th	Night	47% 10% 13% 21% 9% 1	1364
	21st to end	Night	49% 11% 16% 18% 5%	1278
June	1st to 10th	Night	49% 11% 11% 18% 10% 1	1080
	11th to 20th	Night	54% 10% 15% 16% 5%	1080
	21st to end	Night	50% 12% 14% 17% 6% 1	1080
July	1st to 10th	Night	44% 13% 13% 19% 10% 1	1090
	11th to 20th	Night	41% 10% 18% 24% 7% 1	1218
	21st to end	Night	32% 10% 22% 26% 9%	1302
August	1st to 10th	Night	32% 9% 21% 27% 10%	1411
	11th to 20th	Night	31% 10% 20% 28% 10% 1	1474
	21st to end	Night	49% 11% 17% 19% 3 1	1800
September	1st to 10th	Night	42% 10% 16% 24% 7% 1	1800
	11th to 20th	Night	39% 9% 13% 28% 10% 2	1800
	21st to end	Night	50% 9% 14% 19% 8%	2056
October	1st to 10th	Night	48% 9% 19% 18% 5%	2160
	11th to 20th	Night	54% 9% 15% 18% 5%	2161
	21st to end	Night	56% 9% 14% 18% 4	2680
November	1st to 10th	Night	62% 9% 11% 13% 5%	2590
	11th to 20th	Night	60% 11% 11% 13% 6%	2660
	21st to end	Night	65% 10% 10% 10% 5% 1	2848
December	1st to 10th	Night	61% 10% 14% 11% 5%	3040
	11th to 20th	Night	70% 9% 9% 8% 4	3747
	21st to end	Night	58% 10% 14% 12% 5%	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	19% 18% 24% 27% 8% 4	180
	11th to 20th	Day	18% 18% 25% 23% 14% 2	180
	21st to end	Day	23% 23% 24% 20% 7% 4	198
February	1st to 10th	Day	25% 22% 26% 16% 11%	244
	11th to 20th	Day	16% 16% 36% 22% 9% 1	348
	21st to end	Day	14% 21% 35% 19% 10% 1	280
March	1st to 10th	Day	16% 19% 31% 22% 10% 2	416
	11th to 20th	Day	17% 21% 28% 21% 12% 2	420
	21st to end	Day	20% 17% 28% 19% 12% 4	462
April	1st to 10th	Day	16% 20% 29% 24% 10% 2	420
	11th to 20th	Day	14% 17% 30% 22% 10% 6%	412
	21st to end	Day	14% 17% 24% 27% 13% 5%	420
May	1st to 10th	Day	11% 14% 33% 25% 14% 4	423
	11th to 20th	Day	10% 8% 27% 28% 21% 6%	496
	21st to end	Day	11% 8% 25% 29% 23% 4	758
June	1st to 10th	Day	14% 10% 26% 29% 18% 3	810
	11th to 20th	Day	18% 9% 23% 27% 20% 3	810
	21st to end	Day	11% 8% 19% 33% 24% 5%	810
July	1st to 10th	Day	12% 5% 20% 32% 25% 6%	753
	11th to 20th	Day	11% 9% 18% 33% 24% 5%	618
	21st to end	Day	7% 5% 20% 35% 26% 7%	684
August	1st to 10th	Day	6% 5% 18% 36% 26% 8%	461
	11th to 20th	Day	7% 7% 24% 30% 23% 8%	437
	21st to end	Day	11% 10% 26% 28% 20% 5%	495
September	1st to 10th	Day	16% 9% 23% 27% 19% 6%	450
	11th to 20th	Day	16% 10% 19% 29% 19% 8%	450
	21st to end	Day	22% 13% 28% 24% 11% 2	450
October	1st to 10th	Day	23% 12% 22% 21% 17% 4	450
	11th to 20th	Day	22% 14% 26% 20% 16% 1	448
	21st to end	Day	26% 15% 26% 23% 8% 3	243
November	1st to 10th	Day	32% 20% 26% 14% 6% 3	180
	11th to 20th	Day	22% 19% 25% 21% 9% 4	180
	21st to end	Day	23% 19% 26% 18% 9% 6%	180
December	1st to 10th	Day	22% 15% 19% 27% 11% 6%	180
	11th to 20th	Day	16% 16% 21% 29% 16% 3	180
	21st to end	Day	21% 16% 26% 24% 9% 4	198
January	1st to 10th	Night	22% 17% 26% 23% 10% 2	893
	11th to 20th	Night	23% 14% 24% 26% 12% 1	850
	21st to end	Night	22% 17% 22% 25% 12% 2	925
February	1st to 10th	Night	24% 14% 20% 26% 13% 2	760
	11th to 20th	Night	18% 14% 21% 33% 12% 2	722
	21st to end	Night	17% 10% 25% 30% 16% 2	592
March	1st to 10th	Night	16% 16% 25% 26% 15% 3	720
	11th to 20th	Night	14% 16% 29% 26% 14% 2	720
	21st to end	Night	15% 11% 19% 30% 23% 2	792
April	1st to 10th	Night	15% 10% 21% 31% 20% 4	720
	11th to 20th	Night	14% 9% 23% 34% 18% 2	569
	21st to end	Night	14% 12% 29% 27% 16% 2	382
May	1st to 10th	Night	16% 10% 22% 31% 19% 2	360
	11th to 20th	Night	12% 5% 20% 35% 26% 3	354
	21st to end	Night	14% 6% 19% 30% 27% 3	389
June	1st to 10th	Night	18% 8% 18% 35% 19% 2	360
	11th to 20th	Night	19% 7% 18% 31% 23% 3	360
	21st to end	Night	12% 6% 14% 39% 26% 3	360
July	1st to 10th	Night	13% 3 15% 33% 34% 2	350
	11th to 20th	Night	13% 4 18% 33% 30% 3	348
	21st to end	Night	9% 3 13% 38% 32% 6%	394
August	1st to 10th	Night	5% 4 12% 32% 41% 5%	358
	11th to 20th	Night	7% 2 13% 37% 36% 5%	406
	21st to end	Night	15% 5% 13% 34% 28% 4	612
September	1st to 10th	Night	14% 4 18% 37% 25% 2	720
	11th to 20th	Night	13% 6% 16% 31% 28% 7%	720
	21st to end	Night	21% 8% 24% 28% 17% 2	720
October	1st to 10th	Night	20% 8% 18% 33% 17% 4	720
	11th to 20th	Night	23% 12% 20% 24% 18% 2	720
	21st to end	Night	22% 14% 24% 26% 13% 2	792
November	1st to 10th	Night	27% 17% 19% 27% 8% 2	740
	11th to 20th	Night	24% 14% 28% 24% 10% 1	760
	21st to end	Night	26% 14% 23% 25% 9% 2	918
December	1st to 10th	Night	20% 12% 21% 30% 15% 2	1040
	11th to 20th	Night	24% 14% 22% 28% 12% 1	1040
	21st to end	Night	20% 15% 24% 28% 11% 2	1144

Page generated at 2024-02-12 03:35:31. Version ac07

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